physics 100
An apple weighs 1 N. When the apple is held at rest above your head, the net force on the apple is
0 N
An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration is
0 m/s2
Scotty Skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about (REMEMBER: g = 10 m/s/s so 0.5 g means 5 m/s/s and 0.4 g means 4 m/s/s and ...)
0.5g
Scotty Skydiver of mass 100 kg experiences air resistance of 500N, and an acceleration of about
0.5g
The support force on a 10-N book at rest on a table is
10 N
A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about
10 km/h
An apple falls from a tree and hits the ground 5 meters below with a speed of about
10 m/s
When a ball thrown straight upwards reaches the very top of its path, its acceleration is
10 m/s^2
A bag of groceries that has a mass of 10 kilograms weighs about
100 N
An 80-km/h airplane caught in a 60-km/h crosswind has a resultant speed of
100 km/h
An airplane travels at 141 km/h toward the northeast. What is its component of velocity due north?
100 km/h
An object falls freely from rest on a planet where the acceleration due to gravity is 20 m/s 2. After 5 seconds, the object will have a speed of
100 m/s
An object falls freely from rest on a planet where the acceleration due to gravity is 20m/s2. After 5 seconds, the object will have a speed of
100 m/s
One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is
100N
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
10N
If a freely falling object were equipped with a speedometer, its speed reading would increase each second by about
10m/s
The mass of a lamb that weights 110N is about
11KG
An object released from rest on another planet requires one second to fall a distance of 6 meters. What is the acceleration due to gravity on this planet? (Remember: d=(1/2) g t2 where g is the accleration due to gravity on the planet you are studying.)
12 m/s
An airplane that flies at 100 km/h in a 100-km/h crosswind has a ground speed of
141 km/h.
A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to its starting point, the boat travels
141 m.
Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, two seconds later the rockʹs speed is
15 m/s
An apple at rest weighs 1 N. The net force on the apple when it is in free fall is
1N
The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second then its linear speed is
2 m/s
The average speed of a horse that gallops 10 kilometers in 30 minutes is
20km/hr
An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as on Earth. In the first 5 seconds it falls a distance of
250 m
A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. The speed of the car just before the brakes were applied was
30 m/s
If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be
3000 m/s.
Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?
4.0 m/s^2
Burl and Paul have a total weight of 1300 N. The tensions in the supporting ropes that support their scaffold add to 1700 N. The weight of the scaffold itself must be
400 N
An astronaut on another planet drops a 1-kg rock from rest and finds that it falls a vertical distance of 2.5 meters in one second. On this planet, the rock has a weight of
5 N
A humming bird flying at 4 km/h that gets caught in a 3-km/h crosswind has a resultant speed of about
5 km/h
The resultant of a 40-N force at right angles to a 30-N force is
50 N
A 10-N falling object encounters 4N of air resistance. The net force on the object is
6 N.
A car's speed 3 seconds after accelerating from rest at 2 m/s2 is
6 m/s
At one instant an object in free fall is moving downward at 50 m/s. One second later its speed is
60 m/s
A car's engine is 20% efficient. When cruising, the car encounters an average retarding force of 1000 N. If the energy content of fuel is 40 megajoules per liter, how many kilometers per liter does the car achieve?
8
An 80-km/h airplane flying in the same direction as a 10 km/h tail wind has a groundspeed of
90 k/m h
A theory in the field of science is
A synthesis of a large body of well-tested knowledge
Facts in the field of science
Are changeable
The earliest and most influential Greek philosopher was Aristotle, who among many contributions taught that
D - all of the above
When a dishonest scientist reports false information, he or she
Gets no second chance in the scientific community
An educated scientific guess is a
Hypothesis
The tapered shape of the wheel rims that ride on railroad tracks allows opposite wheels to
In effect, vary their diameters; travel at different linear speeds for the same rotational speed.
The accelerations possible for a ball on an inclined plane
Range from zero to g
If you balance a broom horizontally on one finger, the center of gravity of the broom will be above your finger, closer to the bristles end than the handle end. If you saw the broom in two pieces at that point and weigh the two parts on a scale, you'll find that the heavier part is the
The bristles part.
The synthesis of a large collection of information that contains well-tested and verified hypotheses about certain aspects of the world is known as a scientific
Theory.
When a falling object has reached its terminal velocity, its acceleration is
Zero
The vertical height attained by a basketball player who achieves a hang time of a full 1 s is about
about 0.8 m m
A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of
about 14 km/h
A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of
about 14 km/h
A truly educated person is knowledgeable about
all of the above
A vehicle undergoes acceleration when it
all of the above
Recall Galileoʹs Leaning Tower experiment. With negligible air resistance, a heavy and a light object fall
all of the above
The ram of a pile driver drops onto the top of an iron beam, driving it partway into the ground. The distance that the beam sinks into the ground depends on the
all of the above
To a fair approximation, Early Greeks knew the
all of the above
Which of the following involves passion, talent, and intelligence?
all of the above
Science, art, and religion normally need not contradict one another because
all three involve different domains
Consider two flywheels of the same size and shape, but one with twice the mass. Rotational inertia of the more massive one is
c)two times greater.
A simple method of measuring the distance between the Earth and the Moon is to place in your line of sight to the Moon a
coin
Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
decreases
The two measurements necessary for calculating average speed are
distance and time.
Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is
either depending on her running direction
Due to inertia, perhaps a railroad train in motion should continue moving indefinitely when its engine is turned off. This is not observed because railroad trains
encounter opposing forces
The unit kilowatt-hour is a unit of
energy.
A moving van with a stone lightly glued to the midpoint of its ceiling smoothly moves at constant velocity. When the glue gives way, the stone falls and hits the floor
exactly below the midpoint of the ceiling
The force that accelerates the orange and apple system featured in your textbook is actually supplied by the
floor
Science and technology are
fundamentally different from each other
Compared with hang time on Earth, hang time on the Moon would be
greater
When Nellie Newton hangs by the ends of a rope draped over a large pulley, the tension in each supporting vertical strand is
half her weight.
Spots of sunlight on the ground cast through openings between leaves in trees above are actually
images of the sun
A hockey puck sliding at constant velocity across the ice is
in equilibrum
If an objectʹs mass is decreasing while a constant force is applied to the object, the acceleration
increases
The distance a freely falling bowling ball falls each second
increases
The speedometer of an automobile reads
instantaneous speed
A single brick falls with acceleration g. The reason a double brick falls with the same acceleration is
its ratio of force to mass is the same
Two tennis balls fall through the air from a tall building. One of them is filled with lead pellets. The ball to reach the ground first is the (We are not neglecting air resistance in this problem.)
lead-filled ball
A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared with its initial speed is
less
A 10-unit vector at 60° from the vertical has a vertical component with a magnitude
less than 10 units
A 1-kg ball dropped from 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about
more than 2.0 J
A solitary boy cannot balance on a seesaw with its fulcrum at its midpoint. If the fulcrum is moved to one-quarter the distance from the boy, balance is achieved when the weight of the boy is
more than the weight of the seesaw
Three kids pull on a toy. Kim pulls with a force of 30 N north, Jim pulls with a force of 30 N south, and Tim pulls with a force of 15 N east. The acceleration of the toy is
need more information
Phil Physiker standing at the edge of a cliff throws one ball straight up and another ball straight down, both with the same speed. Neglecting air resistance, which ball hits the ground below with the greater speed?
neither, both hit when the same speed
While a car travels around a circular track at a constant speed, its
none of the above
If the speed of a bicycle is reduced to half before skidding to a stop, it will skid
one-fourth as far
A parallelogram is a four-sided figure with opposite sides that are
parallel
The most basic of the sciences of physics, chemistry, and biology is
physics
The exhaust product from a hydrogen fuel cell is
pure water
Galileo's use of inclined planes allowed him to effectively
slow down the balls speed
The statement, There are regions beneath Earth's crust that will always be beyond the reach of scientific investigation is
speculation
A fast-moving missile soaring overhead possesses
speed
While an iron block near the Earthʹs surface is in free fall, it undergoes an increase in
speed
Tension is actually a force that tends to
stretch something.
A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to a state of zero acceleration first?
the light woman
A ball is thrown upwards and returns to the same location. Compared with its initial speed its speed when it returns is about (Neglect air resistance!)
the same
Compared to the mass of an apple on Earth, the mass of the apple on the Moon is
the same
A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact is
the same for both
If the net force on a cart is tripled, the cartʹs acceleration
three times as much
If you place a pipe over the end of a wrench when trying to rotate a stubborn bolt, effectively making the wrench handle twice as long, you'll multiply the torque by
two
A cart maintains a constant velocity of 100 m/s for 10 seconds. During this interval its acceleration is
zero.
The net force acting on an insect falling downward at constant velocity is
zero.
