The planet Venus is often referred to as the Earth's "sister planet" because
A) it is almost the same size and density
B) it looks like the Earth through a telescope
C) its atmosphere has the same composition
D) its surface is very similar
A
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Satellite Motion: A satellite that is in a circular orbit 230 km above the surface of the planet Zeeman-474 has an orbital period of 89 min. The radius of Zeeman-474 is 6.38 × 106 m. What is the mass of this planet? (G = 6.67 × 10-11 N ? m2/kg2)
A. 5.0 × 1024 kg B. 5.5 × 1024 kg C. 6.0 × 1024 kg D. 6.5 × 1024 kg
A 1.0-kg ball is attached to the end of a 2.5-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point in its swing when it is moving horizontally, the ball collides elastically with a 2.0-kg block initially at rest on a horizontal frictionless surface. What is the speed of the block just after the collision?
A. 2.3 m/s B. 4.7 m/s C. 3.5 m/s D. 3.0 m/s E. 7.0 m/s
There are one thousand megabytes in a gigabyte
a. True b. False Indicate whether the statement is true or false
In a plane wave, the wavefronts are
a. circular. b. flat. c. parallel. d. perpendicular to the direction of propagation.