Suppose a ball is dropped from shoulder height, falls, makes a perfectly elastic collision with the floor, and rebounds to shoulder height. Compare the magnitudes of the impulses delivered to the ball by gravity and by the floor during this entire motion.
A. The floor delivers an upward impulse, but gravity does not deliver a total impulse
B. The two impulses have the same magnitude
C. The impulse delivered by the floor is half as large as the impulse delivered by gravity
D. The impulse delivered by the floor is twice as large as the impulse delivered by gravity
Answer: B
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A sans serif is a short line extending from the top or bottom of a character.
Answer the following statement true (T) or false (F)
Two tanks of gas, one of hydrogen, H2, and one of helium, He, contain equal numbers of moles of gas. The gram-molecular mass of He is twice that of H2 . Both tanks of gas are at the same temperature, 293 K. Which statement(s) below is(are) correct when we ignore vibrational motion?
a. The total internal energy of the hydrogen is the same as that of the helium. b. The total internal energy of the hydrogen is 1.4 times that of the helium. c. The total internal energy of the helium is 1.4 times that of the hydrogen. d. The total internal energy of the hydrogen is 1.67 times that of the helium. e. The total internal energy of the helium is 1.67 times that of the hydrogen.
Three strings on a guitar are first stretched to the same tension. The first of the strings is heavy (thick), the third is light (thin), and the second is in between. Rank them according to the speed at which waves would propagate along them if they were plucked, with the fastest last
1.(3) (2) (1) 2.(3) (1) (2) 3.(1) (2) (3) 4.The waves would propagate at the same speed through each.
Molar Specific Heats: A certain ideal gas has a molar specific heat at constant volume 7R/2. What is its molar specific heat at constant pressure?
A. 5R/2 B. 3R/2 C. 8R D. 9R/2 E. 6R