A 10.0-kg box starts at rest and slides 6.0 m down a ramp inclined at an angle of 10° with the horizontal. If there is no friction between the ramp surface and crate, what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s2)
a. 6.1 m/s
c. 10.7 m/s
b. 3.5 m/s
d. 4.5 m/s
D
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A thin electronic circuit board, 0.1 m by 0.1 m in size, is to be cooled in air at 25°C. The board is placed in a vertical position and the back side is well insulated. If the heat dissipation is uniform at 200 W/m2, determine the average temperature of the surface of the board cover.
GIVEN
• Vertical circuit board in air
• Back is well insulated
• Board dimensions (L × H) = 0.1 m × 0.1 m
• Air temperature (T ?) = 25°C
• Uniform heat dissipation rate ( q G/A) = 200 W/m2
FIND
• The average temperature of the surface of the board (Ts)
ASSUMPTIONS
• Ambient air is still
• The board has reached steady state
• Radiation is negligible
SKETCH
The unaided nearsighted human eye focuses light from a distant object
A. on the retina. B. behind the retina. C. in front of the retina. D. acceptably but is too short for the focusing power of the cornea.
The voltage and power ratings of a particular light bulb, which are its normal operating values, are 110 V and 60 W
Assume the resistance of the filament of the bulb is constant and is independent of operating conditions. If the light bulb is operated with a current that is 50% of the current rating of the bulb, what is the actual power drawn by the bulb? A) 15 W B) 10 W C) 30 W D) 20 W E) 25 W
An electron has a kinetic energy that is twice its rest energy. Determine its speed
a. 0.76 c b. 0.81 c c. 0.94 c d. 0.54 c e. 0.87 c