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In the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves. (T/F)
A cannonball is launched from the ground at an angle of 30 degrees above the horizontal and a speed of 30 m/s. Ideally (no air resistance) the ball will land on the ground with a speed of
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is (neglecting air resistance)
An airplane flying into a head wind loses ground speed, and an airplane flying with the wind gains ground speed. If an airplane flies at right angles to the wind, then ground speed is
If you could throw a baseball horizontally at a speed of 8 km/s and if there were no air drag and nothing to stop it,
Suppose a small plane can fly at 170 km/h relative to the surrounding air. Suppose also that there is a 60 km/h tailwind. How fast does the plane's shadow move across the ground?
In the absence of air resistance, at what other angle will a thrown ball go the same distance as one thrown at an angle of 75 degrees?
The astronomer Copernicus publicly stated in the 1500s that Earth
Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane?
The law of inertia states that an object
After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The reason this can be done is that
The force required to maintain an object at a constant speed in free space is equal to
What is the maximum resultant possible when adding a 2-N force to an 8-N force?
The weight of a person can be represented by a vector that acts
Which has more mass, a kilogram of feathers or a kilogram of iron?
An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass?
A heavy person and a light person parachute together and wear the same size parachutes. Assuming they open their parachutes at the same time, which person reaches the ground first?
Suppose the force of friction on a sliding object is 25 N. The force needed to maintain a constant velocity is
A book weighs 4 N. When held at rest in your hands, the net force on the book is
A force of 3 N accelerates a mass of 3 kg at the rate of 1 m/s2. The acceleration of a mass of 6 kg acted upon by a force of 6 N is
A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is
A box is dragged without acceleration in a straight-line path across a level surface by a force of 13 N. What is the frictional force between the box and the surface?
Pressure is defined as
A tennis ball and a solid steel ball with the same diameter are dropped at the same time. Which ball has the greater force acting on it?
The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air resistance, is that
As a care package falls from a high-flying stationary helicopter, its velocity increases and its acceleration
If you pull horizontally on a desk with a force of 150 N and the desk doesn't move, the friction force must be 150 N. Now if you pull with 250 N so the desk slides at constant velocity, the friction force is
Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the cart's mass doubles, what happens to the cart's acceleration?
You are on a frozen pond, and the ice starts to crack. If you lie down on the ice and begin to crawl, this will
A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is
A 6-N falling object encounters 6 N of air resistance. The magnitude of the net force on the object is
Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object. (T/F)
A high school student hits a nail with a hammer. During the collision, there is a force
An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the
A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. What is the reaction to this force?
As a ball falls, the action force is the pull of Earth's mass on the ball. What is the reaction to this force?
An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is
A karate chop delivers a blow of 2300 N to a board that breaks. The force that acts on the hand during this feat
Your friend says that the heavyweight champion of the world cannot exert a force of 95 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no wall and no tricks.
A woman weighing 550 N sits on the floor. She exerts a force on the floor of
Two people pull on a rope in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope?
The momentum of an object is defined as the object's
Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour?
Compared to a sports car moving at 30 miles per hour, the same sports car moving at miles per hour has
The momentum change of an object is equal to the
In order to increase the final momentum of a golf ball, we could
The reason padded dashboards are used in cars is that they
A table tennis ball launcher is fired. Compared to the force on the ball, the force on the launcher is
Momentum of a system is conserved only when
A collision is considered elastic if
Suppose a girl is standing on a pond where there is no friction between her feet and the ice. In order to get off the ice, she can
A cannon recoils from launching a cannonball. The speed of the cannon's recoil is small because the
Suppose a cannon is made of a strong but very light material. Suppose also that the cannonball is more massive than the cannon itself. For such a system
Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher
A 1-N apple falls to the ground. The apple hits the ground with an impact force of
Two gliders having the same mass and speed move toward each other on an air track and stick together. After the collision, the velocity of the gliders is
A piece of putty moving with 2 units of momentum strikes and sticks to a heavy bowling ball that is initially at rest. After the putty sticks to the ball, both are set in motion with a combined momentum that is
A table tennis ball moving forward with 5 units of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of
Superman is at rest in space when he throws an asteroid that has more mass than he does. Which moves faster, Superman or the asteroid?
A cannonball shot from a long-barrel cannon travels faster than one shot from a short-barrel cannon because the cannonball receives a greater
While roller-skating, Granny collides with her tiny grandson Ambrose who is at rest. Ignoring any friction effects, Ambrose's speed after the collision will be greatest when
A small economy car (low mass) and a limousine (high mass) are pushed from rest across a parking lot, equal distances with equal forces. The car that receives the greater impulse is the
A 2-kg ball is thrown at 3 m/s. What is the ball's momentum?
A ball is moving at 6.0 m/s and has a momentum of 24.0 kg·m/s. What is the ball's mass?
Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
A ladybug rests on the bottom of a tin can that is being whirled horizontally on the end of a string. Since the ladybug, like the can, moves in a circle, there must be a force on it. What exerts this force?
"Centrifugal forces" are an apparent reality to observers in a reference frame that is
As the rotational speed of a space habitat increases, the weight of people inside
The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is
Stunt motorcyclist Biker Bob rides his bike inside a futuristic rotating space station-a giant rotating donut-shaped structure in space. The normal support force feels like weight to him. As he rides his bike in the same direction that the station rotates, the normal force
Which has more rotational inertia, a bicycle wheel or a solid disk of the same mass and diameter?
Which has more rotational inertia, a girl running with her legs bent or the same girl running with her legs straight?
Which objects roll down an incline with the greatest acceleration?
A person's rotational inertia is least about _____.
When a gymnast moves from an extended position to a tucked position, she _____ her rotational inertia.
Suppose a huge rotating cloud of particles in space gravitates together to form a dense ball. As the cloud shrinks in size it rotates _____.
Suppose a carnival Ferris wheel has seats that are located halfway between the center and the outside rim. Compared to the ordinary Ferris wheel, where the seats are on the outside rim, your rotational speed on this Ferris wheel would be _____.
A ring and a disk roll down a hill together. Which reaches the bottom first?
A ring, a disk, and a solid ball having equal masses roll down a hill at the same time. Which reaches the bottom first?
Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
Earth rotates and revolves through space. Earth rotates about the ______ , which is an ______ axis. Earth revolves about the ______, which is an _______ axis.
When a wrench is slid spinning over a frictionless tabletop, its center of gravity follows
An object will fall over if its center of gravity is
If an object is in stable equilibrium, any displacement will
If an object is in neutral equilibrium, any displacement will
If you try to touch your toes while standing flat against a wall, you probably will fall over. The reason this happens is that
A picture hangs on a wall from a wire that is passed over a supporting nail. The picture is in stable equilibrium because
You push a table tennis ball beneath the surface of water in a glass of water. The center of gravity of the glass of water
Torque is defined as _____.
Two people sit on a balanced seesaw. When one person leans toward the center of the seesaw, that person's end of the seesaw will _____.
The resistance an object has to changes in its rotational state of motion is called rotational _____.
If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would _____.
The gravitational force between two massive spheres
A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. Which force, if either, is greater?
Two objects move toward each other because of gravitational attraction. As the objects get closer and closer, the force between them _____.
Suppose the gravitational force between two massive spheres is 100 N. If the distance between the spheres is doubled, what is the force between the masses?
Consider the gravitational force between Earth and a meteor in outer space. If the meteor moves so its distance from the Earth's center doubles, the gravitational force on the meteor will be _____.
Suppose the gravitational force between two spheres is 70 N. If the distance between the spheres is halved, what is the force between the masses?
If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh _____.
There are two main processes going on in the sun that keep the sun in existence. These processes are gravitation and _____.
If the sun were to collapse to form a black hole (quite unlikely), Earth would _____.
When calculating the gravitational force between two extended bodies, you should measure the distance
Gravity is what type of force?
The path of a projectile through space is called its:
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