A 1.5-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 20 cm horizontally from the equilibrium position and released from rest, the block first reaches the equilibrium position with a speed of 2.0 m/s. What is the coefficient of kinetic friction between the block and the horizontal
surface on which it slides?
a. 0.34
b. 0.24
c. 0.13
d. 0.44
e. 0.17
a
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Time of flight (TOF) is routinely used to distinguish between different particle species. Calculate the difference in time interval required for a proton 
and a muon (rest mass: 106 
to travel 2.5m, if each have a momentum of 255 MeV/c.
A. 8 ns B. 15 ns C. 18 ns D. 10 ns
Why have studies of the geological record not enabled us to determine how life on Earth originated?
A) the first living organisms would have left absolutely no trace of their existence B) life was planted on the Earth by an advanced civilization so there is no evidence in the geological record to find C) the geological record does not extend back to the time that life originated D) the oldest rocks are too deep inside the Earth for us to retrieve
___________ are produced when two galaxies pass near each other and pull large streamers of stars, gas, and dust away from the galaxies
a. Ring galaxies b. Spiral galaxies c. Rotation curves d. Tidal tails e. Irregular galaxies
A 350-g air track cart on a horizontal air track is attached to a string that goes over a pulley with a moment of inertia of 6.00 × 10-6 kg?m2 and a radius of 1.35 cm. The string is pulled vertically downward by a force of 2.50 N
What is the acceleration of the cart? A) 7.14 m/s2 B) 6.53 m/s2 C) 5.27 m/s2 D) 4.98 m/s2 E) 3.27 m/s2