A golf ball hits a wall and bounces back at 3/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision?
a. 1/4
b. 3/8
c. 7/16
d. 9/16
e. 3/4
c
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Two people are talking at a distance of 3.0 m from where you are, and you measure the sound intensity as 1.1 × 10-7 W/m2. Another student is 4.0 m away from the talkers
Calculate a reasonable estimate for the sound intensity that the other student measures. A) 6.2 × 10-8 W/m2 B) 1.5 × 10-7 W/m2 C) 8.3 × 10-8 W/m2 D) 7.8 × 10-7 W/m2 E) 2.5 × 10-8 W/m2
An ideal monatomic gas cools from 455.0 K to 405.0 K at constant volume as 831 J of energy is removed from it. How many moles of gas are in the sample? The ideal gas constant is R = 8.314 J/mol ? K
A) 2.50 mol B) 2.15 mol C) 1.50 mol D) 1.33 mol E) 0.725 mol
What is parallax?
a. Two lines in the same plane that never meet. b. The way an object looks the same regardless of the observer's location. c. The change in apparent relative positions of different parts of an object when seen from different angles. d. The arrangement of two parts of an object so that one is always seen as directly in front of the other. e. Two lines that cross.
Why are Saturn's rings so thin?
A) The "gap" moons shepherd the particles and maintain its thin profile. B) Any particle in the ring with an orbital tilt would collide with other ring particles, flattening its orbit. C) The current thinness is a short-lived phenomenon that is special to this time. D) Saturn's gravity prevents particles from migrating upwards out of the rings. E) Solar radiation pressure keeps particles pressed into the rings.