f*** mr.z

A herd of sheep eats 7 bales of hay every 4 days. If a bale of hay costs $2.85, how much will it cost to feed the sheep hay for one year?

$1,820.44

Wiley Coyote has missed the elusive road runner once again. This time, he leaves the edge of the cliff at 53.2 m/s horizontal velocity. If the canyon is 130 m deep, how far from his starting point at the edge of the cliff does the coyote land?

274 m

Amanda is standing at the edge of a cliff. She throws a rock vertically upward at speed v0, while at the same time throws a second rock vertically downward at the same speed. How long after the rock thrown downward hits the ground does the rock thrown upwards hit?

2v0/g

Gwen releases a rock at rest from the top of a 45-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?

30 m/s

A ball is launched from ground level at 20 m/s at an angle of 33° above the horizontal. How far does it go before it is at ground level again?

37 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 21 and 56 cm, how many significant figures will result if you only use the part of the meter stick between the 2-cm and 82-cm positions?

4

The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. An astronaut's life support backpack weighs 250 lb on Earth. What does it weigh on the Moon?

41.7 lb

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 3.84 s later. From the frame of reference of the first projectile, what is the velocity of the second projectile as it passes by?

49.4 m/s, downward

A basketball player can jump 1.6 m off the hardwood floor. With what upward velocity did he leave the floor?

5.6 m/s

A stone is thrown with an initial speed of 11.5 m/s at an angle of 55.0 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?

6.60 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 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)

84 m

A projectile is fired at an angle of elevation of 45°. Neglecting air resistance, what are possible angles in flight between the acceleration vector and the velocity vector?

90 and 45 degrees

Which one of the choices below represents the preferred practice regarding significant figures when multiplying the following: 19.8 × 9.2 × 4.9?

900

The distance from New York to London is 3 470 miles. If a plane takes 6.0 hours to fly this distance, what is the plane's average speed in kilometers per hour? 1 mile = 1.609 km.

930

A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/h in 7.00 s. What distance will the sports car travel during the 7.00-s acceleration period? (Hint: First convert speed to m/s.)

97.2 m

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?

Both projectiles have the same acceleration while in flight. The second projectile has the lower speed at maximum altitude. Both projectiles have the same range.

Which formula is dimensionally consistent with an expression yielding a value for velocity? (a is acceleration, x is distance, and t is time)

at

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 does the magnitude of the vertical component of velocity have its minimum value? (air resistance is negligible)

at the top of the trajectory

Which of the following is an example of the type of force that acts at a distance?

gravitational, electrical, magnetic

A projectile is launched at an angle less than 30° and at speed v. Which will increase the projectile's range more, ignoring atmospheric drag?

increasing the speed of launch by 50%

A hiker walks 200 m west and then walks 100 m north. In what direction is her resulting displacement?

no correct answers

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?

the acceleration of the car

A projectile is thrown horizontally at 14.0 m/s. The projectile hits the ground 0.570 s later. What is the angle of impact the projectile makes with the horizontal ground?

-21.8 degrees

A ball is rolled horizontally off a table with an initial speed of 0.28 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)

0.056 m

A track star in the broad jump goes into the jump at 12.0 m/s and launches himself at 28.0 ° above the horizontal. How long is he in the air before returning to Earth? ( g = 9.8 m/s 2)

1.1 s

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 3.00 yards per second. What is his speed in furlongs per fortnight?

1.65E+4 furlongs/fortnight

A bird, accelerating from rest at a constant rate, experiences a displacement of 22 m in 12 s. What is the average velocity?

1.8 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 20.0 seconds and stops. What is the average velocity of the deer during this time?

11.2 m/s

In which of the following cases is the displacement's magnitude half the distance traveled?

15 steps east followed by 5 steps west

A bridge that was 10.8 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 2.50 m lower than the road on this side.

15.1 m/s

A rock is thrown straight down with an initial velocity of 13.5 m/s from a cliff. What is the rock's displacement after 1.0 s? (Acceleration due to gravity is 9.80 m/s2.)

18 m

Rita accelerates a 0.45-kg ball from rest to 7.0 m/s during the 0.14 s in which her foot is in contact with the ball. What average force does she apply to the ball during the kick?

23 N

A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 6.00 s. What is the speed after the first 5.00 s of acceleration? (Hint: First convert the speed to m/s.)

23.1 m/s

A stone is thrown with an initial speed of 11.5 m/s at an angle of 55.0 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 displacement of the rock?

23.9 m

A rock, released at rest from the top of a tower, hits the ground after 2.5 s. What is the speed of the rock as it hits the ground? ( g = 9.8 m/s 2 and air resistance is negligible)

25 m/s

A stone is thrown with an initial speed of 11.5 m/s at an angle of 55.0 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 vertical-velocity component of the rock as it hits the ground?

26.0 m/s

Which type of quantity is characterized by both magnitude and direction?

vector

In the terminology a 500-N block, the 500-N refers to the block's:

weight

A bird, accelerating from rest at a constant rate, experiences a displacement of 30 m in 10 s. What is its acceleration?

0.60 m/s^2

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)

1.68 x 10^2 m

The highest mountain on Mars is Olympus Mons, rising 22000 meters above the Martian surface. If we were to throw an object horizontally off the mountain top, how long would it take to reach the surface? (Ignore atmospheric drag forces and use gMars = 3.72 m/s2.)

1.8 minutes

A Cessna aircraft has a lift-off speed of 120 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 290 m?

1.92 m/s^2

Multiplying a 2-significant-figure number by a 3-significant-figure number and then dividing the product by a eight-significant-figure number yields a number with how many significant figures?

2

A stone is thrown with an initial speed of 11.5 m/s at an angle of 55.0 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?

26.8 m/s

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 5 and 6 cm, how many significant figures will result if you only use the part of the meter stick between the 86-cm and 92-cm positions?

3

The length and width of a standard sheet of paper is measured, and then the area is found by calculation to be 85.40 in^2. The number of significant figures in the width measurement must be at least

3

A 50.0-g ball traveling at 28.0 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 1.50 ms, what is the average acceleration of the ball during this time interval?

3.27E+4m/s^2

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?

42 degrees

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?

> 0.5 T

Two baseballs are released at the same time. One is dropped from rest and the other is given an initial horizontal velocity. Which of the following is not true? Ignore atmospheric drag.

The horizontal component of velocity increases at a greater rate than the vertical component of velocity for both while they are in the air.

If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is:

being accelerated

The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?

third

If the displacement of an object, x, is related to velocity, v, according to the relation x = Av, the constant, A, has the dimension of which of the following?

time

Displacement is which of the following types of quantities?

vector

A change in a physical quantity w having initial value wi and final value wf is given by which of the following?

wf-wi