The Sun's declination on June 21st is
A) +23.5 degrees.
B) 0 degrees.
C) -23.5 degrees.
D) different depending on where you are on Earth.
A
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Energy and Momentum: An egg falls from a bird's nest in a tree and feels no effects due to the air. As it falls,
A. only its kinetic energy is conserved. B. only its momentum is conserved. C. both its kinetic energy and its momentum are conserved. D. only its mechanical energy is conserved. E. both its mechanical energy and its momentum are conserved.
The conservation of energy equation must include
A. Work done on the system B. Thermal energy added to the system C. Thermal energy leaving the system D. Work done by the system. E. All of these are correct.
The fact that the strength of gravity decreases with distance means the force of gravity exerted by one object on another (e.g., the Earth and Moon) is greater on the near side than the far side. This effect is commonly referred to as a
A) tidal force B) differential force C) distortive force D) tractive force
A hollow steel ball of diameter 3.0 m barely floats in water. What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm3 and that of water is 1000 kg/cc
A) 6.6 cm B) 37 cm C) 131 cm D) 79 cm