A spaceship moving past the Earth with a speed of 0.800c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
A. 13.4 s
B. 16.7 s
C. 12.5 s
D. 9.70 s
E. 6.03 s
Answer: B
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Young's Modulus: A 50-kg load is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. By what distance will the wire stretch? Young's modulus for steel is 2.0 × 1011 Pa.
A. 1.5 cm B. 2.5 cm C. 3.5 cm D. 4.5 cm
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The power you supply to the crate is __________
Fill in the blank(s) with correct word
A particle (q = +5.0 mC) is released from rest when it is 2.0 m from a charged particle which is held at rest. After the positively charged particle has moved 1.0 m toward the fixed particle, it has a kinetic energy of 50 mJ. What is the charge on the fixed particle?
a. -2.2 mC b. +6.7 mC c. -2.7 mC d. +8.0 mC e. -1.1 mC
In a velocity selector for ions, when the velocity of the ions is double the value for which the selector is set, how do the magnetic force 
and the electric force 
compare?
A. 
B. 
C. 
D. 
E. 