Compared to sea level, water in an open pot in the mountains boils at
A) a higher temperature.
B) a lower temperature.
C) the same temperature.
D) none of the above
Answer: B
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To help Kim practice for the Special Olympics, Sally runs beside him for half the required distance. She runs the remaining distance at her regular speed and arrives 90 seconds ahead of Kim. What is the ratio of Sally's regular speed to Kim's speed? Use tKim for Kim's total time.
A.
B.
C.
D.
E.
John is carrying a shovelful of snow. The center of mass of the 3.00 kg of snow he is holding is 15.0 cm from the end of the shovel. He is pushing down on the opposite end of the shovel with one hand and holding it up 30.0 cm from that end with his other hand. Ignore the mass of the shovel. Sarah says that his hand pushing down on the shovel must be exerting a greater force than the hand pushing
up. James says it is just the reverse. Which one, if either, is correct? a. Sarah, because the hand pushing down must exert a greater force to match the torque exerted by the snow. b. James, because, depending on the location of the axis of rotation, the hand pushing down can counteract the torque exerted by the snow. c. James, because the hand pushing up must exert a force that equals the sum of the force of the hand pushing down and the weight of the snow. d. James, because both (b) and (c) above are correct. e. Neither, because the hands exert forces of equal magnitudes.
A proton's rest mass is 1.67 × 10^?27 kg. Calculate its kinetic energy when it is accelerated to a speed of 0.80 c
a. 1.0 × 10^?10 J b. 1.5 × 10^?10 J c. ?2.0 × 10^?10 J d. 2.5 × 10^?10 J e. 7.5 × 10^?10 J
The total kinetic plus potential energy of a body
a. can be negative b. always stays constant if the body is freely falling c. always stays constant if friction is acting d. can remain constant even if the body's speed is decreasing