A Hooke's law spring is compressed 12.0 cm from equilibrium, and the potential energy stored is 36.0 J. What compression (as measured from equilibrium) would result in 100 J being stored in this case?
a. 20.0 cm
c. 13.6 cm
b. 14.1 cm
d. The correct answer is not given.
A
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A projectile is projected from the origin with a velocity of 45.0 m/s at an angle of 30.0 degrees above the horizontal. What is the time it takes for the projectile to hit the ground?
A. 2.54 s B. 3.02 s C. 4.59 s D. 5.31 s E. 6.04 s
A simple pendulum of length 1.87 m has a mass of 120 g attached. It is drawn back 38.0° and then released. What is the maximum speed of the mass?
a. 1.44 m/s b. 3.93 m/s c. 2.74 m/s d. 2.79 m/s e. 0.249 m/s
A light-emitting diode has a power output of 0.3 W. If 590 nm is the average wavelength of the source, about how many photons are emitted per second? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, and 1 nm = 10-9 m)
a. 1021 c. 1018 b. 1025 d. 1029
The greatest diffraction occurs for
a. ? < d. b. ? = d. c. ? > d. d. none of these; that is, it makes no difference.