A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall. The ball strikes the wall horizontally with a speed of and it bounces back with this same speed
The ball is in contact with the wall What is the magnitude of the average force exerted on the wall by the ball? A) 800 N
B) 400 N
C) 55,000 N
D) 27,500 N
E) 13,750 N
A
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Gas in a container increases its pressure from 1 atm to 3 atm while keeping its volume constant. Find the work done (in J) by the gas if the volume is 5 liters
a. 0 b. 3 c. 5 d. 15 e. 15 × 10^2
Metric system: How many nanoseconds does it take for a computer to perform one calculation if it performs 6.7 × 107 calculations per second?
A. 15 ns B. 67 ns C. 11 ns D. 65 ns
The specific heat of water is 1.000 cal/gm 
What is the specific heat of water in the mks system of units?
A. 2,124 J/kg 
B. 2,765 J/kg
C. 3,417 J/kg
D. 3,764 J/kg
E. 4,186 J/kg
Star #1 is approaching the Earth with speed v. Star #2 is receding from the Earth with the same speed v. Measurements of the same spectral line from each of the stars show Doppler shifts in frequency. The light from which star will have the larger magnitude shift in frequency?
a. star #1 b. Both stars will have the same shift. c. The value of the speed must be known before an answer can be found. d. star #2