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.)
5.52 N
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A 50.0 g glass container contains 200 g of water at
A 20.0 g piece of an alloy at
is added to the water in the container. The final temperature of the mixture is 
What is the specific heat of the alloy in cal/gm 
(specific heat of water = 1.00 cal/gm
specific heat of glass = 0.200 cal/gm
A. 2.75 B. 1.87 C. 1.54 D. 0.852 E. 0.553
Photon Energy: A helium-neon laser emits light at 632.8 nm. If the laser emits 1.82 × 10-17 photons/second, what is its power output in mW? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 57.2 mW B. 28.6 mW C. 37.2 mW D. 45.7 mW
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
A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy is absorbed by the BB, what is the change in the temperature of the BB? The specific heat of lead is 128 J/kg ? K
A) 0.940 K B) 1.10 K C) 1.26 K D) 2.78 K E) 3.78 K