A 3.00 g lead bullet is traveling at a speed of 300 m/s when it embeds in a wood post. If we assume that half of the resultant heat energy generated remains with the bullet, what is the increase in temperature of the embedded bullet? (specific heat of lead = 0.0305 kcal/kg• °C, 1 kcal = 4186 J)
a. 113°C
c. 176°C
b. 137°C
d. 259°C
C
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Two spaceships approach Earth from the same direction. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?
A) 0.13c B) 0.14c C) 0.15c D) 0.16c E) 0.18c
The inversion of Marjorie's image in a plane mirror is actually an inversion of
A) left and right. B) up and down. C) front and back. D) all of the above
A form of precipitation that results from convection cycles in clouds is
a. sleet. b. rain. c. hail. d. fog.
A skater extends her arms horizontally, holding a 5-kg mass in each hand. She is rotating about a vertical axis with an angular velocity of one revolution per second. If she drops her hands to her sides, what will the final angular velocity (in rev/s) be if her moment of inertia remains approximately constant at 5 kg×m2, and the distance of the masses from the axis changes from 1 m to 0.1 m?
a. 6 b. 3 c. 9 d. 4 e. 7