A 2.0-kg block sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If the block has a speed of 4.0 m/s as it passes through the equilibrium position, what is its speed when it is 20 cm from the equilibrium position?
a. 2.6 m/s
b. 3.1 m/s
c. 3.5 m/s
d. 1.9 m/s
e. 2.3 m/s
C
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Which of the following statements correct describes overall energy balance in a star?
A) Gravity balances pressure. B) Energy generated by fusion in the core balances the energy emitted from the star's surface. C) Temperature balances light energy emitted at the photosphere. D) Energy in sunspots balances energy in magnetic fields.
In the development of a terrestrial planet, the stage of ____ when dense material settled to the core and less dense to the outer parts
a. differentiation b. cratering c. glaciation d. accretion e. flooding
Which of the partition functions below yields an average energy Eavg that is NOT an integer multiple of 
in the high-temperature (small-?) limit? Assume that ? is a constant with units of energy, and ? = 1/kBT.
A. Z = (2?/??)2
B. Z = (??)?1/2
C. Z = (1 ? e??? )?1 (note that ex ? 1 + x when 
<< 1)
D. None of the above.
E. All of the above.
A car is initially traveling west at 25 mph, and makes a turn north. As the car finishes the turn, its velocity is 20 mph north. It takes 3.5 seconds to complete the turn. What is the average acceleration of the car while it is turning, in mph/s? Let east be the positive-x direction and north be the positive-y direction.
a. -7.1i + 5.7j b. 7.1-5.73 c. 571-7.13 d. -5.7i+71.