An 825-kg space vehicle is circling Earth in a circular orbit with a radius of 10,300 km
Its orbit is to be changed to a larger circle with a radius of 17,400 km. How much energy is required to accomplish this? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2.
A) 1.00 × 109 J
B) 1.30 × 1010 J
C) 6.51 × 109 J
D) 4.45 × 109 J
E) 4.50 × 1010 J
B
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A 20.0 kg box slides down a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 50.0 N is applied to the box in the upward direction. The applied force F makes an angle of 0.00 to the incline. If the incline has a coefficient of kinetic friction of 0.000, then the increase in the kinetic energy of the box is
A. 620 J. B. 576 J. C. 542 J. D. 500 J. E. 475 J.
Sound waves can interfere with one another so that no sound results
A) True B) False C) Either, depending on the air temperature.
At which planet can the pole remain in darkness for 42 years, then have 42 years of constant daylight?
A) Pluto B) Neptune C) Uranus D) Jupiter E) Saturn
One way in which the ionizing radiation occurring naturally in the environment has been beneficial to the human race is
A) the application of solar radiation to the treatment of cancer. B) in the operation of the electron microscope. C) in making nuclear fission possible. D) in producing the mutations that are essential for the process of evolution. E) nonsense--there are no beneficial uses of naturally-occurring high-energy radiation.