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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and the electric force 
compare?
A. 
B. 
C. 
D. 
E. 
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