A jet plane in straight horizontal flight passes over your head. When it is directly above you, the sound seems to come from a point behind the plane in a direction 30◦ from the vertical. The speed of the plane is:

Two bodies are falling with negligible air resistance, side by side, above a horizontal plane. If one of the bodies is given an additional horizontal acceleration during its descent, it:

Of the following situations, which one is impossible?

Throughout a time interval, while the speed of a particle increases as it moves along the x axis, its velocity and acceleration might be:

A particle moves on the x axis. When its acceleration is positive and increasing:

A ball is in free fall. Its acceleration is:

A ball is in free fall. Upward is taken to be the positive direction. The displacement of the ball during a short time interval is:

Which one of the following statements is correct for an object released from rest?

A freely falling body has a constant acceleration of 9.8 m/s2. This means that:

An object is shot vertically upward. While it is rising:

A feather, initially at rest, is released in a vacuum 12 m above the surface of the earth. Which of the following statements is correct?

The area under a velocity-time graph represents:

Displacement can be obtained from:

An object has a constant acceleration of 3 m/s2. The coordinate versus time graph for this object has a slope:

The coordinate-time graph of an object is a straight line with a positive slope. The object has:

We say that the displacement of a particle is a vector quantity. Our best justification for this assertion is:

If the magnitude of the sum of two vectors is less than the magnitude of either vector, then:

If the magnitude of the sum of two vectors is greater than the magnitude of either vector, then:

Velocity is defined as:

Acceleration is defined as:

Which of the following is a scalar quantity?

Which of the following is a vector quantity?

Which of the following is NOT an example of accelerated motion?

Two bodies are falling with negligible air resistance, side by side, above a horizontal plane. If one of the bodies is given an additional horizontal acceleration during its descent, it:

The velocity of a projectile equals its initial velocity added to:

A stone thrown from the top of a tall building follows a path that is:

Identical guns fire identical bullets horizontally at the same speed from the same height above level planes, one on the Earth and one on the Moon. Which of the following three statements is/are true? I. The horizontal distance traveled by the bullet is greater for the Moon. II. The flight time is less for the bullet on the Earth. III. The velocity of the bullets at impact are the same.

A bullet shot horizontally from a gun:

A bomber flying in level flight with constant velocity releases a bomb before it is over the target. Neglecting air resistance, which one of the following is NOT true?

An object is shot from the back of a railroad flatcar moving at 40 km/h on a straight horizontal road. The launcher is aimed upward, perpendicular to the bed of the flatcar. The object falls:

A particle moves at constant speed in a circular path. The instantaneous velocity and instan- taneous acceleration vectors are:

A stone is tied to a string and whirled at constant speed in a horizontal circle. The speed is then doubled without changing the length of the string. Afterward the magnitude of the acceleration of the stone is:

Two objects are traveling around different circular orbits with constant speed. They both have the same acceleration but object A is traveling twice as fast as object B. The orbit radius for object A is

An example of an inertial reference frame is:

An object moving at constant velocity in an inertial frame must:

SI units a force is numerically equal to the ______ when the force is applied to it.

Which of the following quantities is NOT a vector?

A newton is the force:

The unit of force called the newton is:

A force of 1N is:

Acceleration is always in the direction:

The term “mass” refers to the same physical concept as:

The inertia of a body tends to cause the body to:

Mass differs from weight in that:

The mass of a body:

The mass and weight of a body:

Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because:

A feather and a lead ball are dropped from rest in vacuum on the Moon. The acceleration of the feather is:

Equal forces F act on isolated bodies A and B. The mass of B is three times that of A. The magnitude of the acceleration of A is:

A car travels east at constant velocity. The net force on the car is:

An applied. This force produces an acceleration: object rests on a horizontal frictionless surface. A horizontal force of magnitude F is

A heavy steel ball B is suspended by a cord from a block of wood W. The entire system is dropped through the air. Neglecting air resistance, the tension in the cord is:

You stand on a spring scale on the floor of an elevator. Of the following, the scale shows the highest reading when the elevator:

You stand on a spring scale on the floor of an elevator. Of the following, the scale shows the highest reading when the elevator:

The “reaction” force does not cancel the “action” force because:

A book rests on a table, exerting a downward force on the table. The reaction to this force is:

A lead block is suspended from your hand by a string. The reaction to the force of gravity on the block is the force exerted by:

A brick slides on a horizontal surface. Which of the following will increase the magnitude of the frictional force on it?

The coefficient of kinetic friction:

When the brakes of an automobile are applied, the road exerts the greatest retarding force:

A force F (larger than the largest possible force of static friction) is applied to the left to an object moving to the right on a horizontal surface. Then:

A professor holds an eraser against a vertical chalkboard by pushing horizontally on it. He pushes with a force that is much greater than is required to hold the eraser. The force of friction exerted by the board on the eraser increases if he:

Why do raindrops fall with constant speed during the later stages of their descent?

A ball is thrown downward from the edge of a cliff with an initial speed that is three times the terminal speed. Initially its acceleration is

A ball is thrown upward into the air with a speed that is greater than terminal speed. On the way up it slows down and, after its speed equals the terminal speed but before it gets to the top of its trajectory:

A ball is thrown upward into the air with a speed that is greater than terminal speed. It lands at the place where it was thrown. During its flight the force of air resistance is the greatest:

Uniform circular motion is the direct consequence of:

An object moving in a circle at constant speed:

An object moves around a circle. If the radius is doubled keeping the speed the same then the magnitude of the centripetal force must be:

An object moves in a circle. If the mass is tripled, the speed halved, and the radius unchanged, then the magnitude of the centripetal force must be multiplied by a factor of:

If a satellite moves above Earth’s atmosphere in a circular orbit with constant speed, then:

The driver of a 1000-kg car tries to turn through a circle of radius 100 m on an unbanked curve at a speed of 10m/s. The actual frictional force between the tires and slippery road has a magnitude of 900 N. The car:

A coin is placed on a horizontal phonograph turntable. Let N be the magnitude of the normal force exerted by the turntable on the coin, f be the magnitude of the frictional force exerted by the turntable on the coin, and fs, max be the maximum possible force of static friction. The speed of the turntable is increased in small steps. If the coin does not slide, then

Which of the following is NOT a correct unit for work?

Which of the following groups does NOT contain a scalar quantity?

An object moves in a circle at constant speed. The work done by the centripetal force is zero because:

The work done by gravity during the descent of a projectile:

A baseball is hit high into the upper bleachers of left field. Over its entire flight the work done by gravity and the work done by air resistance, respectively, are:

A line drive to the shortstop is caught at the same height as it was originally hit. Over its entire flight the work done by gravity and the work done by air resistance, respectively, are:

The mechanical advantage of any machine is:

In the object vertically, there is a reduction in: raising an object to a given height by means of an inclined plane, as compared with raising

A watt is:

Power has the dimensions of:

Which of the following five units represents a quantity that is NOT the same as the other four?

A watt·second is a unit of:

A watt per hour is a unit of:

A kilowatt·hour is a unit of:

Only if a force on a particle is conservative:

A nonconservative force:

The sum of the kinetic and potential energies of a system of objects is conserved:

A force on a particle is conservative if:

Two objects interact with each other and with no other objects. Initially object A has a speed of 5 m/s and object B has a speed of 10 m/s. In the course of their motion they return to their initial positions. Then A has a speed of 4 m/s and B has a speed of 7 m/s. We can conclude:

A good example of kinetic energy is provided by:

No kinetic energy is possessed by:

The wound spring of a clock possesses:

A body at rest in a system is capable of doing work if:

Which one of the following five quantities CANNOT be used as a unit of potential energy?

Suppose that the fundamental dimensions are taken to be: force (F), velocity (V) and time (T). The dimensions of potential energy are then:

A golf ball is struck by a golf club and falls on a green three meters above the tee. The potential energy of the Earth-ball system is greatest:

An elevator is rising at constant speed. Consider the following statements: I. the upward cable force is constant II. the kinetic energy of the elevator is constant III. the gravitational potential energy of the Earth-elevator system is constant IV. the acceleration of the elevator is zero V. the mechanical energy of the Earth-elevator system is constant: