physics chapter 1 lecture assignment, physics chapter 2/3 lecture assignment, physics chapter 2/3 lecture quiz, Chapter 4 Lecture Assignment
Vector A is 2.0 i + 3.5 j . Vector B is -3.1 i - 3.1 j . What is A + 2B? a) -4.2 i + -2.7 j b) -1.1 i - 0.4 j c) 5.1 i + 6.6 j d) 8.2 i + 9.7 j
a) -4.2 i + -2.7 j
An object moves 10.0 m east in 10.0 s and then returns to its starting point taking an additional 40.0 s. If west is chosen as the positive direction, what is the average speed of the object? a) 0.4 m/s b) -0.4 m/s c) 10.0 m/s d) 0 m/s e) -10.0
a) 0.4 m/s
A 50.0-g ball traveling at 22.0 m/s is bounced off a brick wall and rebounds at 21.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 2.50 ms, what is the average acceleration of the ball during this time interval? a) 1.72E+4 m/s^2 b) 3.44E+4 m/s^2 c) 8.60E+3 m/s^2 d) 1.72E+1 m/s^2 e) 4.30E+1 m/s^2
a) 1.72E+4 m/s^2
A physics class in a large lecture hall has 150 students. The total mass of the students is about ____ kg. a) 10^4 b) 10^5 c) 10^6 d) 10^7 e) 10^8
a) 10^4
A rock is rolled in the sand. It starts at 5.0 m/s, moves in a straight line for a distance of 6.0 m, and then stops. What is the magnitude of the average acceleration? a) 2.1 m/s^2 b) 4.2 m/s^2 c) 5.4 m/s^2 d) 6.2 m/s^2
a) 2.1 m/s^2
A Cessna aircraft has a lift-off speed of 135 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 260 m? a) 2.70 m/s^2 b) 1.35 m/s^2 c) 3.38 m/s^2 d) 5.41 m/s^2 e) 2.03 m/s^2
a) 2.70 m/s^2
d) 195.7 ***WRONG***Which one of the choices below represents the preferred practice regarding significant figures when multiplying the following: 15.0 × 5.6 × 2.33? a) 200 b) 195.720 c) 195.72 d) 195.7 e) 196
a) 200?
A plane is moving due north, directly towards its destination. Its airspeed is 210 mph. A constant breeze is blowing from west to east at 20.0 mph. At what rate is the plane moving north? a) 209 mph b) 211 mph c) 204 mph d) 199 mph e) 194 mph
a) 209 mph
Gwen releases a rock at rest from the top of a 40-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the speed of the rock as it hits the ground? a) 28 m/s b) 14 m/s c) 20 m/s d) 40 m/s e) 780 m/s
a) 28 m/s
Wiley Coyote has missed the elusive road runner once again. This time, he leaves the edge of the cliff at 52.4 m/s horizontal velocity. If the canyon is 140 m deep, how far from his starting point at the edge of the cliff does the coyote land? a) 280 m b) 198 m c) 396 m d) 140 m e) 70.0 m
a) 280 m
Calculate (0.83 + 0.049)(4.4 × 10^3), keeping only significant figures. a) 3 900 b) 3 868 c) 3 886 d) 3 644 e) 4 000
a) 3 900
A furlong is a distance of 220 yards. A fortnight is a time period of two weeks. A race horse is running at a speed of 6.00 yards per second. What is his speed in furlongs per fortnight? a) 3.30E+4 furlongs/fortnight b) 4.71E+3 furlongs/fortnight c) 3.31E+4 furlongs/fortnight d) 3.33E+4 furlongs/fortnight e) 3.28E+4 furlongs/fortnight
a) 3.30E+4 furlongs/fortnight
b) 1.80 s ***WRONG***A rock is thrown straight up with an initial velocity of 17.6 m/s. What time interval elapses between the rock's being thrown and its return to the original launch point? (Acceleration due to gravity is 9.80 m/s2.) a) 3.60 s b) 1.80 s c) 2.70 s d) 3.06 s e) 3.96 s
a) 3.60 s?
The information on a one-gallon paint can is that the coverage, when properly applied, is 440 ft^2. One gallon is 231 in^3. What is the average thickness of the paint in such an application? a) 3.6E-3 in b) 5.3E-1 in c) 4.4E-2 in d) 1.3E-2 in e) 1.6E-1 in
a) 3.6E-3 in
Mt. Everest is more than 8 000 m high. How fast would an object be moving if it could free fall to sea level after being released from an 8 000-m elevation? (Ignore air resistance.) a) 396 m/s b) 120 m/s c) 1 200 m/s d) 12 000 m/s
a) 396 m/s
A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 8.0 m/s. A stop watch measures the stone's trajectory time from top of cliff to bottom to be 5.9 s. How far out from the cliff's edge does the stone travel horizontally? (g = 9.8 m/s2 and air resistance is negligible) a) 41 m b) 27 m c) 300 m d) 130 m
a) 41 m
A train slowly climbs a 400-m mountain track which is at an angle of 8.0° with respect to the horizontal. How much altitude does it gain? a) 55.7 m b) 200 m c) 60.7 m d) 396 m e) 400 m
a) 55.7 m
A cereal box has the dimensions of 0.14 m × 0.22 m × 0.070 m. If there are 3.28 feet per meter, then what is the volume of the box in cubic feet? a) 7.6E-2 cubic feet b) 2.3E-2 cubic feet c) 2.7E-1 cubic feet d) 3.9E-3 cubic feet e) 1.3E-2 cubic feet
a) 7.6E-2 cubic feet
On planet Q the standard unit of volume is called the guppy. Space travelers from Earth have determined that one liter = 39.0 guppies. How many guppies are in 230 liters? a) 8 970 guppies b) 9 010 guppies c) 8 740 guppies d) 9 200 guppies e) 8 930 guppies
a) 8 970 guppies
A cheetah can run at approximately 100 km/h and a gazelle at 80.0 km/h. If both animals are running at full speed, with the gazelle 50.0 m ahead, how long before the cheetah catches its prey? a) 9.0 s b) 14 s c) 18 s d) 4.5 s e) 21 s
a) 9.0 s
Which of the following is not a vector quantity? a) mass b) acceleration c) displacement d) velocity
a) mass
A projectile is launched at an angle θ above the horizontal. Three seconds later the projectile is moving the same angle θ below the horizontal. Which of the following (actual values with units, not just algebraic symbols) can be found from the information given? a) the initial vertical component of the projectile's velocity b) the initial horizontal component of the projectile's velocity c) the initial magnitude of the velocity d) none of the above since at least one of the above must be given to find the other two values.
a) the initial vertical component of the projectile's velocity
Which expression is dimensionally consistent with an expression that would yield a value for time−1? (v is velocity, x is distance, and t is time) a) v/x b) v^2/x c) x/t d) v^2t
a) v/x
Displacement is which of the following types of quantities? a) vector b) scalar c) magnitude d) dimensional
a) vector
Which of the following is an example of a vector quantity? a) velocity b) temperature c) volume d) mass
a) velocity
Terrence goes for a walk. He walks 2.0 km north, then turns and walks 4.0 km south of east. What is his displacement vector? Take east to be in the + i -direction and north to be in the + j -direction. a) (2.0 i + 4.0 j ) km b) (2.8 i - 0.8 j ) km c) (4.8 i + 5.7 j ) km d) (5.7 i - 2.8 j ) km
b) (2.8 i - 0.8 j ) km
A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stop watch measures the ball's trajectory time from table to the floor to be 0.20 s. How far away from the table does the ball land? (g = 9.8 m/s2 and air resistance is negligible) a) 0.24 m b) 0.048 m c) 0.39 m d) 0.15 m e) 0.47 m
b) 0.048 m
Assume everyone in the United States consumes one soft drink in an aluminum can every two days. If there are 270 million Americans, about how many tons of aluminum need to be recycled each year if each can weighs 1/15 pound and one ton = 2 000 pounds? a) 450 000 tons b) 1.6 million tons c) 3.3 million tons d) 0.82 million tons e) 410 000 tons
b) 1.6 million tons
A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 5.85 s. What was the height from which the ball was dropped? (g = 9.80 m/s2 and assume air resistance is negligible) a) 1.88 × 10^2 m b) 1.68 × 10^2 m c) 1.38 × 10^2 m d) 3.36 × 10^2 m
b) 1.68 × 10^2 m
What is the distance between the two polar coordinates (2.0, 30°) and (9.0, 145°)? a) 6.0 b) 10.0 c) 9.8 d) 9.2
b) 10.0
An object moves at a constant velocity of 12 m/s to the southwest for an interval of 30 s. Halfway through this interval, what is the magnitude of its instantaneous velocity? a) It can be any value from 0 to 24 m/s. b) 12 m/s c) 6 m/s d) More information is needed. e) 24 m/s
b) 12 m/s
A startled deer runs 520 m at 20.0° north of east for half a minute, then turns and runs 380 m at 55.0° north of west for 15.0 seconds and stops. What is the average velocity of the deer during this time? a) 14.3 m/s b) 12.4 m/s c) 20.0 m/s d) 36.1 m/s
b) 12.4 m/s
A jogger runs halfway around a circular path with a radius of 60.0 m. What, respectively, are the magnitude of the displacement and the distance jogged? a) 60.0 m, 188 m b) 120 m, 188 m c) 0 m, 377 m d) 120 m, 377 m e) 60.0 m, 377 m
b) 120 m, 188 m
A bridge that was 10.4 m long has been washed out by the rain several days ago. How fast must a car be going to successfully jump the stream, if we neglect air resistance? Although the road is level on both sides of the bridge, the road on the far side is 3.00 m lower than the road on this side. a) 18.8 m/s b) 13.3 m/s c) 10.9 m/s d) 26.6 m/s e) 14.3 m/s
b) 13.3 m/s
A stone is thrown with an initial speed of 11.5 m/s at an angle of 50.0 above the horizontal from the top of a 30.0-m-tall building. Assume air resistance is negligible, and g = 9.8 m/s2. What is the speed of the rock as it hits the ground? a) 11.5 m/s b) 26.8 m/s c) 24.5 m/s d) 16.2 m/s
b) 26.8 m/s
An object, initially moving in the negative x-direction, is subjected to a change in velocity in the positive y-direction. If the resulting velocity vector is drawn from the origin, into which quadrant does this vector point? a) 1st b) 2nd c) 3rd d) None, since the object is now moving in the y-direction.
b) 2nd
A room in a house has a floor area of 110 ft^2. Which of the following is most likely the approximate volume of the room? a) 3 m^3 b) 30 m^3 c) 300 m^3 d) 3 000 m^3 e) 10 m^3
b) 30 m^3
When NASA was communicating with astronauts on the Moon, the time from sending on the Earth to receiving on the Moon was 1.28 s. Find the distance from Earth to the Moon. (The speed of radio waves is 3.00 × 108 m/s.) a) 240 000 km b) 384 000 km c) 480 000 km d) 768 000 km
b) 384 000 km
I walk six miles in a straight line in a direction north of east, and I end up four miles north and several miles east. How many degrees north of east have I walked? a) 19° b) 42° c) 60° d) 71°
b) 42°
On planet Z, the standard unit of length is the foose. Ann the Astronaut is 5.2 feet tall on Earth. She lands on planet Z and is measured to be 88 foosi tall. Her partner Rachael is 92 foosi tall. How tall is Rachael on Earth? a) 5.9 feet b) 5.4 feet c) 5.2 feet d) 5.1 feet e) 5.6 feet
b) 5.4 feet
Two ships set sail from the same port. Ship A sails a distance of 35.0 kilometers in a direction 30.0° north of east, and drops anchor. Ship B sails due south. When ship B is 30.0 km from the port, how far apart are the ships? a) 46.1 km b) 56.3 km c) 65.0 km d) 75.9 km
b) 56.3 km
Water flows into a swimming pool at the rate of 7.0 gal/min. The pool is 17 ft wide, 32 ft long and 7.0 ft deep. How long does it take to fill? (1 U.S. gallon = 231 cubic inches) a) 34 hours b) 68 hours c) 67 hours d) 136 hours e) 680 hours
b) 68 hours
A cheetah can maintain its maximum speed of 96.0 km/hr for 26.0 seconds. What minimum distance must a gazelle running 85.0 km/hr be ahead of the cheetah to escape? a) 96 m b) 79 m c) 40 m d) 73 m e) 67 m
b) 79 m
A taxicab moves five blocks due north, five blocks due east, and another three blocks due north. Assume all blocks are of equal size. How far is the taxi from its starting point? a) 13 blocks b) 9.4 blocks c) 9.2 blocks d) 8.6 blocks
b) 9.4 blocks
Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies? a) The greater mass hits the ground first. b) Both objects hit the ground together. c) The smaller mass hits the ground first. d) No conclusion can be made with the information given.
b) Both objects hit the ground together.
How long has it been that scientists have accepted that the nucleus of the atom consists of neutrons and protons? Think of your answers in terms of order of magnitude. a) about a decade b) about a century c) about a thousand years d) since Aristotle
b) about a century
In a two-dimensional Cartesian coordinate system the y-component of a given vector is equal to that vector's magnitude multiplied by which trigonometric function, with respect to the angle between vector and y-axis? a) sine b) cosine c) tangent d) cotangent
b) cosine
A v vs. t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 5 s the acceleration of the ball is zero. We know that at t = 5 s, a) the slope of the curve is non-zero. b) the velocity of the ball is not changing. c) the curve is not crossing the time axis. d) the curve is at v = 0, t = 0.
b) the velocity of the ball is not changing.
In 1983 the standard meter was redefined to what it is currently. What was the previous definition from 1960 based on? a) specific alloy bar housed at Sevres, France b) wavelength of light emitted by certain krypton atoms c) distance from the Earth's equator to the North Pole d) the distance light travels in a certain fraction of a second
b) wavelength of light emitted by certain krypton atoms
Consider the magnitude of the average speed, vavg, speed, mag, and the magnitude of the average velocity, vavg, velocity, mag, for the same trip. Which of the following is always true? a) vavg, speed, mag = vavg, velocity, mag b) vavg, speed, mag ≥ vavg, velocity, mag c) vavg, speed, mag ≤ vavg, velocity, mag d) none of the above
b) vavg, speed, mag ≥ vavg, velocity, mag
An apartment has 1 100 ft^2 of floor space. What is the approximate volume of the apartment? a) 10^2 ft^3 b) 10^3 ft^3 c) 10^4 ft^3 d) 10^5 ft^3 e) 10^6 ft^3
c) 10^4 ft^3
Vector A is 3.00 units in length and points along the positive x axis; vector B is 5.00 units in length and points along a direction 150° from the positive x axis. What is the direction of their sum with respect to the positive x axis? a) 62.0° b) 13.0° c) 118° d) 103°
c) 118°
An object moves at a constant velocity of 12 m/s to the southwest for an interval of 20 s. Halfway through this interval, what is the magnitude of its instantaneous velocity? a) It can be any value from 0 to 24 m/s. b) 6 m/s c) 12 m/s d) More information is needed.
c) 12 m/s
A vehicle designed to operate on a drag strip accelerates from zero to 34 m/s while undergoing a straight-line path displacement of 48 m. What is the vehicle's acceleration if its value may be assumed to be constant? a) 9 m/s^2 b) 6.0 m/s^2 c) 12 m/s^2 d) 18 m/s^2 e) 24 m/s^2
c) 12 m/s^2
Multiplying a 2-significant-figure number by a 4-significant-figure number and then dividing the product by a seven-significant-figure number yields a number with how many significant figures? a) 6/7 b) 1 c) 2 d) 13 e) 8/7
c) 2
A student adds two vectors with magnitudes of 200 and 70. Which one of the following is the only possible choice for the magnitude of their sum? a) 100 b) 280 c) 200 d) 70
c) 200
A boat moves at 10.8 m/s relative to the water. If the boat is in a river where the current is 2.00 m/s, how long does it take the boat to make a complete round trip of 1 100 m upstream followed by a 1 100-m trip downstream? a) 250 s b) 172 s c) 211 s d) 297 s e) 336 s
c) 211 s
Amir drives his ATV from coordinates (5.0 km, 25°) directly to (25.0 km, 45°) in 45 minutes. What is the ATV's speed? a) 0.5 km/h b) 20.4 km/h c) 27.2 km/h d) 34.0 km/h
c) 27.2 km/h
A speeding car traveling at a constant velocity of 24 m/s passes a police care initially at rest beside the roadway. If the police car with constant acceleration of 3.0 m/s2 immediately pursues the speeding car, how far down the road does it draw even with the speeding car? a) 190 m b) 290 m c) 380 m d) 770 m
c) 380 m
d) 4 ***WRONG***Assume when using a meter stick measuring can be done so that the last significant figure is in the tenth of a millimeter digit. If you are measuring an object with length between 8 and 9 cm, how many significant figures will result if you only use the part of the meter stick between the 82-cm and 93-cm positions? a) 0 b) 2 c) 3 d) 4 e) more than 4
c) 3?
A circle has an area of 3.0 m^2. A second circle has double the radius of the first. The area of the second circle is ____ times that of the first. a) 0.8 b) 2.0 c) 4.0 d) 6.0
c) 4.0
The mass of a star is 8.0 × 10^30 kg, and the mass of a hydrogen atom is 1.67 × 10^−27 kg. If we assume that the star is mostly composed of hydrogen, approximately how many atoms are there in the star? a) 1.3E+4 atoms b) 2.1E-58 atoms c) 4.8E+57 atoms d) 8.0E+30 atoms
c) 4.8E+57 atoms
A projectile is fired directly upwards at 49.4 m/s. A second projectile is dropped from rest at some higher elevation at the instant the first projectile is fired and passes the first projectile 3.00 s later. From the frame of reference of the first projectile, what is the velocity of the second projectile as it passes by? a) 64.1 m/s, downward b) 71.5 m/s, downward c) 49.4 m/s, downward d) 34.7 m/s, downward e) 104 m/s, downward
c) 49.4 m/s, downward
The distance to a hypothetical galaxy is estimated at about 7 × 10^6 light years. A light year is the distance traveled by light in one year; if the speed of light is 3 × 10^8 m/s, about how far is it from our galaxy to this hypothetical galaxy? (1 year = 3.15 × 10^7 s) a) 7E+21 m b) 1E+9 m c) 7E+22 m d) 7E+5 m
c) 7E+22 m
A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 12 m/s. A stop watch measures the stone's trajectory time from top of cliff to bottom to be 4.8 s. What is the height of the cliff? (g = 9.8 m/s2 and air resistance is negligible) a) 140 m b) 110 m c) 84 m d) 29 m
c) 84 m
A ball rolls down an incline, starting from rest. If the total time it takes to reach the end of the incline is T, how much time has elapsed when it is halfway down the incline? a) 0.5 T b) < 0.5 T c) > 0.5 T d) More information is needed.
c) > 0.5 T
Suppose an equation relating position, x, to time, t, is given by x = bt^3 + ct^4, where b and c are constants. The dimensions of b and c are respectively: a) T^3, T^4. b) 1/T^3, 1/T^4. c) L/T^3, L/T^4. d) L^2⋅T^3, L^2⋅T^4.
c) L/T^3, L/T^4.
Suppose the interior angles of a triangle are φ1, φ2, and φ3, with φ1 > φ2 > φ3. Which side of the triangle is the shortest? a) The side opposite φ1. b) The side opposite φ2. c) The side opposite φ3. d) More information is needed unless the triangle is a right triangle.
c) The side opposite φ3.
Vector 1 is 7 units long and is at 70°. Vector 2 is 5 units long and is at 155°. Vector 3 is 3 units long and is at 225°. Which vector has equal-magnitude components? a) Vector 1 b) Vector 2 c) Vector 3 d) None of the vectors has equal-magnitude components
c) Vector 3
In mechanics, physicists use three basic quantities to derive additional quantities. Mass is one of the three quantities. What are the other two? a) length and force b) power and force c) length and time d) force and time
c) length and time
The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units would be: a) m. b) s. c) m/s. d) kg/s.
c) m/s.
Changing the positive direction in a reference frame to the opposite direction does not change the sign of which of the following quantities? a) velocity b) average velocity c) speed d) displacement
c) speed
A strobe photograph shows equally-spaced images of a car moving along a straight road. If the time intervals between images is constant, which of the following cannot be positive? a) the speed of the car b) the average velocity of the car c) the acceleration of the car d) the direction of motion of the car
c) the acceleration of the car
If a is acceleration, v is velocity, x is position, and t is time, then which equation is not dimensionally correct? a) t = x/v b) a = v2/x c) v = a/t d) t2 = 2x/a
c) v = a/t
If a is acceleration, v is velocity, x is position, and t is time, then which equation is not dimensionally correct? a) t = x/v b) a = v^2/x c) v = a/t d) t^2 = 2x/a
c) v = a/t
A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.36 s. What is the height of the table? (g = 9.8 m/s2 and air resistance is negligible) a) 0.72 m b) 0.55 m c) 0.016 m d) 0.64 m e) 0.65 m
d) 0.64 m
A string attached to an airborne kite is maintained at an angle of 44.0° with the horizontal. If a total of 160 m of string is reeled in while bringing the kite back to the ground, what is the horizontal displacement of the kite in the process? (Assume the kite string doesn't sag.) a) 111 m b) 80.0 m c) 31.7 m d) 115 m e) 155 m
d) 115 m
***WRONG***A baseball leaves the bat with a speed of 47 m/s and an angle of 45° above the horizontal. A 5.0-m-high fence is located at a horizontal distance of 137 m from the point where the ball is struck. Assuming the ball leaves the bat 1.0 m above ground level, by how much does the ball clear the fence? a) 59.7 m b) 47.7 m c) 49.7 m d) 121 m
d) 121 m
When a drag strip vehicle reaches a velocity of 65.0 m/s, it begins a negative acceleration by releasing a drag chute and applying its brakes. While reducing its velocity back to zero, its acceleration along a straight-line path is a constant −7.10 m/s2. What displacement does it undergo during this deceleration period? a) 595 m b) 4.58 m c) 2 110 m d) 298 m e) 9.15 m
d) 298 m
Assume when using a meter stick measuring can be done so that the last significant figure is in the tenth of a millimeter digit. If you are measuring an object with length between 25 and 53 cm, how many significant figures will result if you only use the part of the meter stick between the 3-cm and 85-cm positions? a) 1 b) 2 c) 3 d) 4 e) more than 4
d) 4
A high fountain of water is in the center of a circular pool of water. You walk the circumference of the pool and measure it to be 190 meters. You then stand at the edge of the pool and use a protractor to gauge the angle of elevation of the top of the fountain. It is 55°. How high is the fountain? a) 25 m b) 53 m c) 86 m d) 43 m e) 48 m
d) 43 m
Two wires support a post, with dimensions as shown in the figure. If d = 14 m, what is the value of x? a) 7.5 m b) 6.5 m c) 18.3 m d) 5.2 m
d) 5.2 m
A stone is thrown with an initial speed of 11.5 m/s at an angle of 50.0 above the horizontal from the top of a 30.0-m-tall building. Assume air resistance is negligible, and g = 9.8 m/s2. What is the magnitude of the horizontal-velocity component of the rock as it hits the ground? a) 79.5 m/s b) 8.81 m/s c) 58.7 m/s d) 7.39 m/s
d) 7.39 m/s
A rifle is aimed horizontally toward the center of a target 120 m away. If the bullet strikes 11.2 cm below the center, what was the velocity of the bullet? (Ignore air friction.) a) 23 m/s b) 1 120 m/s c) 32 m/s d) 790 m/s e) 400 m/s
d) 790 m/s
The basic function of an automobile's carburetor is to atomize the gasoline and mix it with air to promote rapid combustion. Assume that 30.0 cm^3 of gasoline is atomized into N spherical droplets. Each droplet has a radius of 1.0 × 10^−5 m. Find the total surface area of these N spherical droplets. a) 3.0E+4 cm^2 b) 1.2E+5 cm^2 c) 1.8E+5 cm^2 d) 9.0E+4 cm^2 e) 1.1E+5 cm^2
d) 9.0E+4 cm^2
Two projectiles are launched at 100 m/s, the angle of elevation for the first being 30° and for the second 60°. Which of the following statements is false? a) Both projectiles have the same acceleration while in flight. b) The second projectile has the lower speed at maximum altitude. c) Both projectiles have the same range. d) All of the above statements are true.
d) All of the above statements are true.
Note the expression: y = x2. Which statement is most consistent with this expression? a) If y doubles, then x quadruples. b) y is greater than x. c) If x doubles, then y doubles. d) If x doubles, then y quadruples.
d) If x doubles, then y quadruples.
An object is dropped from a height. Once it is moving, which of the following statements is true, at least at one point? a) Its velocity is more than its acceleration. b) Its velocity is less than its acceleration. c) Its velocity is the same as its acceleration. d) Its velocity is never equal to its acceleration
d) Its velocity is never equal to its acceleration
A hiker walks 200 m west and then walks 100 m north. In what direction is her resulting displacement? a) north b) west c) northwest d) None of the answers is correct.
d) None of the answers is correct.
c) at the top of the trajectory***WRONG***A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point is the magnitude of the acceleration at a minimum? (air resistance is negligible) a) just after leaving the center fielder's hand b) just before arriving at the catcher's mitt c) at the top of the trajectory d) acceleration is constant during entire trajectory
d) acceleration is constant during entire trajectory?
Which formula is dimensionally consistent with an expression yielding a value for velocity? (a is acceleration, x is distance, and t is time) a) v/t^2 b) vx^2 c) v^2/t d) at
d) at
A car is initially moving at 20 m/s east, and a little while later it is moving at 10 m/s north. Which of the following best describes the orientation of the average acceleration during this time interval? a) northeast b) northwest c) west d) north of west
d) north of west
The nuclei of atoms contain a) electrons only. b) neutrons only. c) protons and electrons. d) protons and neutrons.
d) protons and neutrons.
Since 1983 the standard meter has been defined in terms of which of the following? a) specific alloy bar housed at Sevres, France b) wavelength of light emitted by krypton-86 c) distance from the Earth's equator to the North Pole d) the distance light travels in a certain fraction of a second e) None of the above
d) the distance light travels in a certain fraction of a second
A baseball thrown from the outfield is released from shoulder height at an initial velocity of 28.3 m/s at an initial angle of 30.0° with respect to the horizontal. If it is in its trajectory for a total of 4.00 s before being caught by the third baseman at an equal shoulder-height level, what is the ball's net vertical displacement during its 4.00-s trajectory? a) 98.0 m b) 9.80 m c) 10.2 m d) zero e) 20.4 m
d) zero
Which one of the choices below represents the preferred practice regarding significant figures when adding the following: 15.9 + 14 + 77.68 + 6.898? a) 114.4780 b) 114.478 c) 114.48 d) 114.5 e) 114
e) 114
Human reaction time is usually about 0.18 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? The nearest value is a) 32 cm. b) 88 cm. c) 1.6 cm. d) 180 cm. e) 16 cm.
e) 16 cm.
An object moves along the x axis, with its position given by the function x(t) = ½ t3. Which of the following can be obtained from a graph of x vs. t? a) The velocity of the object at any instant in time b) The displacement of the object during a specified time interval c) The speed of the particle at any instant in time d) The average velocity of the object during as specified time interval e) All of the above
e) All of the above
Which point is nearest the x-axis? a) (1, 7) b) (-3, -6) c) (-7, 5) d) (-6, -4) e) (2, 3)
e) (2, 3)
Each edge of a cube has a length of 12.7 cm. What is the length of a diagonal of the cube going through the center of the cube? a) 24.0 in. b) 22.0 in. c) 25.5 in. d) 20.5 in. e) 8.7 in.
e) 8.7 in.
