Physics Topics

Car A is traveling and has momentum P. Car B is traveling and has momentum 2P. What are two possible differences between cars A and B? Car B has larger mass OR car B has faster speed. Car B has smaller mass OR car B has slower speed. Car B has smaller mass OR car B has faster speed. Car B has larger mass OR car B has slower speed.

A 6-pounder field gun (cannon) used during the American Civil War has a mass of 405 kg and uses a cannonball with a mass of 2.40 kg. If the cannonball is fired with a speed of 470 m/s what is the recoil speed of the cannon? 3.7 m/s 2.1 m/s 0.5 m/s 2.8 m/s

A stone is held at a height h above the ground. A second stone with one half the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is one-fourth as much. twice as much. one-half as much. the same. four times as much.

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time t to reach the ground, what time will it take the 10-kg rock to reach the ground? t 2t 4t t/2

A wood block is sliding down a rough inclined surface at constant speed. What energy transformation is taking place? Kinetic energy into gravitational potential energy. Gravitational potential energy into thermal energy. Kinetic energy into thermal energy. Gravitational potential energy into kinetic energy.

An apple of mass m rests on a flat table. The earth pulls on this apple with a force of magnitude mg, and the table exerts a normal force on the apple. What is the reaction force to the normal force from the table? The apple pulling upward on the Earth with force mg. The apple pushing down on the table with force mg. The table pushing up on the apple with force mg. The table pushing down on the floor with force mg. The table pulling upward on the Earth with force mg.

___ is usually the most effective treatment for phobias, such as fear of dogs or of public speaking. Cognitive therapy Family intervention therapy Exposure therapy Psychoanalysis

Two balls are traveling towards each other an have an inelastic collision. Ball A has a mass of 3.1 kg and a velocity of 1.00 m/s to the right while ball B has a mass of 1.9 kg and a velocity of 1.80 m/s to the left. After the collision, ball A has a velocity of 0.50 m/s to the left. Find the velocity of ball B and use that to find out the group total final kinetic energy. 7.7 J 2.5 J 0.8 J 1.4 J

Carrie shoots a basketball at an angle of 40° from the horizontal. It leaves her hands 6 feet from the ground with a velocity of 22 ft/s. Step 3 of 3: Determine the height of the ball when it is 10 feet away horizontally. Round to the nearest tenth.

A football was thrown into the air at a speed of 23 miles per hour at an angle of 50° from the horizontal. Express this velocity in vector form. Round your answer to four decimals.

A volleyball was hit into the air at a speed of 21 miles per hour at an angle of 40° from the horizontal. Express this velocity in vector form. Round your answer to four decimals.

A wheel is rotating counter clock-wise and slowing down. What are the signs of the angular velocity and acceleration? Both, the angular velocity and acceleration are negative. The angular velocity is negative and the angular acceleration is positive. The angular velocity is positive and the angular acceleration is negative. Both, the angular velocity and acceleration are positive.

An object is moving with constant non-zero velocity. Which one of the following statements about it must be true? its acceleration is in the same direction as its velocity, The net force on the object is zero. A constant non-zero net force is being applied to it in the direction of motion A constant non-zero net force is being applied to it opposite to the direction of motion A constant non-zero net force is being applied to it perpendicular to the direction of motion

A box weighing 5 N is resting on a table. A downward force w is exerted by the earth on the book and an upward force n is exerted on the book by the table. The reaction to the force w is a force exerted by the earth on the book a force exerted by the earth on the table a force exerted by the book on the table a force exerted by the book on the earth a force exerted by the table on the book

Two small objects, with masses mand M, are originally a distance rapart, and the gravitational force on each one has magnitude F. The second object has its mass changed to M/4. What is the magnitude of the new gravitational force? F/4 16F 4F F/16

A net torque applied to an object causes a linear acceleration of the object the object to rotate at a constant rate the moment of inertia of the object to change the angular velocity of the object to change