Simple Harmonic Motion: The figure shows a graph of the velocity v as a function of time t for a system undergoing simple harmonic motion. Which one of the following graphs represents the acceleration of this system as a function of time?
A. graph a
B. graph b
C. graph c
D. graph d
Answer: B
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For driving voltage 
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A boy releases his 2.0 kg toy, from rest, at the top of a sliding-pond inclined at 20° above the horizontal. What will the toy's speed be after sliding 4.0 m along the sliding-pond? The coefficient of kinetic friction is 0.20
A) 3.0 m/s B) 4.4 m/s C) 2.2 m/s D) 5.2 m/s E) 3.5 m/s
A plane wall, 7.5 cm thick, generates heat internally at the rate of 105 W/m3 . One side of the wall is insulated, and the other side is exposed to an environment at 90°C. The convection heat transfer coefficient between the wall and the environment is 500 W/(m2 K). If the thermal conductivity of the wall is 12 W/(m K), calculate the maximum temperature in the wall.
GIVEN
FIND
- The maximum temperature in the wall (Tmax)
ASSUMPTIONS
- The heat loss through the insulation is negligible
- The system has reached steady state
- One dimensional conduction through the wall
SKETCH
When you are in a high-flying jet plane, does either your weight or your mass differ from their normal value as measured on the ground?
A) No, both your weight and your mass are exactly the same as on the ground. B) Both your weight and your mass are slightly reduced. C) Both your weight and your mass are slightly increased. D) Your weight is slightly reduced, but your mass is unchanged. E) Your weight is slightly increased, but your mass is unchanged.