Uniform Circular Motion: In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.5 km?
A. 79 m/s
B. 310 m/s
C. 260 m/s
D. 160 m/s
E. 510 m/s
Answer: D
You might also like to view...
A star's absolute magnitude is its apparent brightness as seen from
A) 10 parsecs distance. B) 100 parsecs distance. C) Pluto. D) Alpha Centauri. E) 10 light-years distance.
A 1500-W heater is connected to a 120-V line. How much heat energy does it produce in 2.0 hours?
A) 1.5 kJ B) 3.0 kJ C) 0.18 MJ D) 11 MJ E) 18 MJ
Which of the following statements is true of the evolution of massive stars?
A) Once the gas in the core of a massive star has been converted to iron, there are no further nuclear reactions that can release energy. B) Once helium fusion has occurred, the core of the massive star will never get hot enough to fuse any additional elements. C) Silicon fusion produces neon, the most tightly bound of all atomic nuclei, which inhibits the release of energy after a nuclear fusion. D) The most massive blue giant stars can fuse elements heavier than iron in their cores.
A brass cube, 15.0 cm on a side, is raised in temperature by 170°C. The coefficient of volume expansion of brass is 57 × 10^?6/C°. By what percentage does volume increase?
a. 33% b. 1.4% c. 1.0% d. 3.4% e. 2.81%