The Earth's axis is always tilted at an angle of _________ degrees to the plane of the ecliptic.
What will be an ideal response?
23.5
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In the giant impact theory of the Moon's origin,
a. the Moon broke from a rapidly spinning Earth. b. Earth and its Moon formed from the same cloud of matter. c. the Moon formed elsewhere in the solar nebula and was later captured by Earth. d. the Moon formed when a very massive planetesimal smashed into the young Earth.
A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of 10.0 degrees to the incline. What is the work done by the applied force, in Joules?
A. 1,870 B. 1,770 C. 1,500 D. 1,450 E. 1,380
Why do single-dish radio telescopes have poor resolving power compared to optical telescopes of the same diameter?
A 1.0-kg object is moving with a constant velocity 2.0 m/s toward the north. There are two forces acting on the object. One of the forces is 3.0 N north. What is the second force that acts on the object?
A) 1.0 N north. B) 3.0 N north. C) 3.0 N south. D) 2.0 N north. E) 0.