Suppose a 0.45-kg mass on a spring-loaded gun that has been compressed 0.10 m has elastic potential energy of 1.50 J. How high above the spring's equilibrium point can the gun fire the mass if the gun is fired straight up?
a. 0.34 m
b. 0.58 m
c. 0.24 m
d. 3.2 m
e. 33 m
c
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Answer the following statement(s) true (T) or false (F)
1. A particle’s Newtonian x-momentum 
is always either equal to or smaller than the x component of the particle’s four-momentum px
2. A particle’s mass is always either equal to or smaller than the time-component of its four-momentum
3. The absolute value of the x component of a particle’s four-momentum vector is always either equal to or smaller than its t component
4. The squared magnitude of a four-vector could be negative.
5. The squared magnitude of a particle’s four-momentum could be negative.
A jet fighter plane is launched from a catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2 s. Assuming the acceleration is constant, what is the length of the catapult?
A) 16 m B) 42 m C) 24 m D) 66 m E) 84 m
The terrestrial planets are made almost entirely of elements heavier than hydrogen and helium. According to modern science, where did these elements come from?
A) They were produced by gravity in the solar nebula as it collapsed. B) They were produced by stars that lived and died before our solar system was born. C) They have been present in the universe since its birth. D) They were made by chemical reactions in interstellar gas.
A uniform pressure of 5.7 × 10^5 N/m2 is applied to all six sides of a copper cube. What is the percentage change in volume of the cube? (for copper, B = 14 × 10^10 N/m2)
a. 0.00070% b. 0.00040% c. 0.0000020% d. 0.00041%