A newly discovered planet has twice the mass and three times the radius of the earth. What is the free-fall acceleration g at the surface of the earth?
a. 2/9 g
b. 2/3 g
c. 3/4 g
d. 4/3 g
Answer: a. 2/9 g
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Refer to Table 2-1. Based on the information in the table, what is the ratio of the intensity of Dra to that of Nim?
a. 2.512 b. 5 c. 8.07 d. 11.14 e. 100
A nail with a diameter of 1.00 mm projects 25.0 mm horizontally outward from a wall. A 40.0 N picture is hung from the end of the nail. If the shear modulus is 
then how much does the nail deflect downward?
A. 
B. 
C. 
D. 
E. 
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. When they hit the ground
A) both of them will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have times the kinetic energy of the lighter one.
A possible means of spaceflight is to place a perfectly reflecting aluminized sheet into Earth orbit and use the light from the sun to push this solar sail. If a huge sail of area 6.00 × 10^5 m2 and mass 6 000 kg were placed into orbit and turned toward the sun, what would be the force exerted on the sail? (Assume a solar intensity of 1 380 W/m2.)