Choose the BEST answer to the following:An object in free

Choose the BEST answer to each of the following: The language of science is (a) mathematics. (b) Latin. (c) Chinese. (d) Arabic.

Choose the BEST answer to each of the following: Somebody who says “That’s only a theory” likely doesn’t know that a scientific theory is (a) an educated guess. (b) a hypothesis. (c) a vast synthesis of well-tested hypotheses and facts. (d) None of these.

Choose the BEST answer to each of the following: The force needed to keep a ball rolling along a bowling alley is (a) due to gravity. (b) an inertial force. (c) a slight breeze. (d) None of these.

Choose the BEST answer to each of the following: The equilibrium rule, \(\Sigma F=0\), applies to objects (a) at rest. (b) moving at constant velocity. (c) Both. (d) Neither

If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in (a) a curve. (b) a straight line. (c) an outward spiral. (d) an inward spiral.

The average speed of a gazelle traveling a distance of 2 km in a time of one-half hour is (a) 1 km/h. (b) 2 km/h. (c) 4 km/h. (d) greater than 4 km/h.

An object in free fall undergoes an increase in (a) speed. (b) acceleration. (c) both speed and acceleration.

When a cannonball is fired from a cannon, both the cannonball and the cannon experience equal (a) amounts of force. (b) accelerations. (c) Both. (d) Neither

Choose the BEST answer to each of the following The team that wins in a tug-of-war is the team that (a) produces more tension in the rope than the opponent. (b) pushes hardest on the ground. (c) Both. (d) Neither.

Choose the BEST answer to each of the following An airplane with its nose pointing north with an airspeed of 40 km/h in a 30-km/h crosswind (at right angles) has a groundspeed of (a) 30 km/h. (b) 40 km/h. (c) 50 km/h. (d) 60 km/h.

Choose the BEST answer to each of the following The impulse–momentum relationship is a direct result of Newton’s (a) first law. (b) second law. (c) third law. (d) law of gravity.

Choose the BEST answer to each of the following: A big fish swims upon and swallows a small fish that is at rest. Right after lunch, the fattened big fish has a change in (a) speed. (b) momentum. (c) Both. (d) Neither.

Choose the BEST answer to each of the following: The work done on a 100-kg crate that is hoisted 2 m in a time of 4 s is (a) 200 J. (b) 500 J. (c) 800 J. (d) 2000 J.

Choose the BEST answer to each of the following: The power required to raise a 100-kg crate a vertical distance of 2 m in a time of 4 s is (a) 200 W. (b) 500 W. (c) 800 W. (d) 2000 W

Choose the BEST answer to each of the following: When a model car speeds up to three times its original speed, its kinetic energy is (a) the same. (b) twice as great. (c) three times greater. (d) None of these.

Choose the BEST answer to each of the following: When 100 J are put into a device that puts out 40 J of useful work, the efficiency of the device is (a) 40%. (b) 50%. (c) 60%. (d) 140%.

Choose the BEST answer to each of the following: A machine cannot multiply (a) forces. (b) distances. (c) energy. (d) None of these.

Choose the BEST answer to each of the following: When a tin can is whirled in a horizontal circle, the net force on the can acts (a) inward. (b) outward. (c) upward. (d) None of these.

Choose the BEST answer to each of the following: A torque is a force (a) like any other force. (b) multiplied by a lever arm. (c) that is fictitious. (d) that accelerates things.

Choose the BEST answer to each of the following: The rotational inertia of an object is greater when most of the mass is located (a) near the rotational axis. (b) away from the axis. (c) on the rotational axis. (d) off center.

Choose the BEST answer to each of the following: If the Sun were twice as massive, its pull on Mars would be (a) unchanged. (b) twice as much. (c) half as much. (d) four times as much.

Choose the BEST answer to each of the following: The highest ocean tides occur when Earth and the Moon are (a) lined up with the Sun. (b) at right angles to the Sun. (c) at any angle to the Sun. (d) lined up during spring.

Choose the BEST answer to each of the following: The component of velocity that can remain constant for a tossed baseball is (a) horizontal. (b) vertical. (c) Either of these. (d) None of these.

Choose the BEST answer to each of the following: The magnitude of the gravitational force on a satellite is constant if the orbit is (a) parabolic. (b) circular. (c) elliptical. (d) All of these

Choose the BEST answer to each of the following: A satellite in Earth orbit is above Earth’s (a) atmosphere. (b) gravitational field. (c) Both. (d) Neither.