In Olympic bobsled races, the sleds travel down the mountain at speeds up to 90 mph in ice coated tracks, navigating several sharp turns. If the bobsled is going too fast around a turn, it
A. travels up the wall on the outside of the turn.
B. remains in the middle of the track.
C. travels up the wall on the inside of the turn.
A. travels up the wall on the outside of the turn.
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An inventor develops a stationary cycling device by which an individual, while pedaling, can convert all of the energy expended into heat for warming water. What minimum power must be generated if 210 g water (enough for 1 cup of coffee) is to be heated in 14.0 min from 26.0°C to 84.0°C? (1 cal = 4.186 J, the specific heat of water is 4 186 J/kg/°C)
a. 3 640 W b. 289 W c. 60.7 W d. 850 W e. 42.5 W
Which of the following energy sources might supply energy for life on the surface of Titan?
A) asteroid and comet impacts B) cryovolcanism C) chemical reactions in the upper atmosphere D) all of these
The bathyscaphe Trieste consists of a cylindrical hull, 15.2 m long and 3.66 m in diameter, filled with gasoline with a density of 880 kg/m3 to make it buoyant
If it is totally submerged in salt water with a density of 1025 kg/m3 and neither rising nor sinking, what is the weight of the craft? A) 127 kN B) 227 kN C) 327 kN D) 427 kN E) 527 kN
A ball bearing rolls along a smooth horizontal tabletop, and crashes head-on into a second ball bearing of half its mass. If both ball bearings roll in the x-direction only (either positive or negative) and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision, what was the velocity of the first ball bearing after the collision?
A. -2.4 m/s B. +2.4 m/s C. -1.2 m/s D. +1.2 m/s E. -0.6 m/s F. +0.6 m/s