A 40.0-kg crate is being lowered by means of a rope. Its downward acceleration is 2.00 m/s2. What is the force exerted by the rope on the crate?
A) 40.0 N
B) 80.0 N
C) 232 N
D) 312 N
E) 472 N
D
Physics & Space Science
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Which internal energy source is the most important in continuing to heat the terrestrial planets today?
A) accretion B) differentiation C) radioactivity D) tidal heating
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A candle is 32.0 cm in front of a convex spherical mirror of radius of curvature 68.0 cm. What are the image distance and the magnification, respectively?
a. –16.5 cm, + 0.515 b. –21.8 cm, – 1.94 c. –36.0 cm, + 0.242 d. –1.9 cm, + 1.94 e. 16.5 cm, – 0.515
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What is the mass of exactly 1 million helium atoms? The atomic mass of helium is 4.00 u.
a. 
b. 
c. 
d. 
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Theory predicts that neutron stars may not exceed 3 solar masses
Indicate whether the statement is true or false
Physics & Space Science