The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a distance of 12.0 cm, what is its maximum speed when the engine is running at 3000 rpm?
a. 4.71 m/s
c. 44.0m/s
b. 9.42 m/s
d. 22.0 m/s
D
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Wind blows at 50 m/s around a 5 cm diameter electric power line when the air temperature is -10ºC. Estimate the heat loss of the power line per unit length if the surface temperature of the power line is 5ºC.
What will be an ideal response?
The focal length of a magnifying glass is 15 cm. If the near point of a person is 25 cm, what is the angular magnification of the glass for this person when his eyes are focused at infinity?
A) 1.7 B) 2.7 C) 3.7 D) 4.7 E) 5.7
Series/Parallel Circuits: For the circuit shown in the figure, the current in the 8.0-? resistor is 0.50A. What is the current in the 2.0-? resistor? All the numbers shown are accurate to two significant figures.
A. 2.25 A B. 0.75 A C. 4.5 A D. 9.5 A E. 6.4 A
What is the physical difference between light and a radio wave?
A) Light waves have a higher frequency than radio waves. B) Light is an electromagnetic wave while radio is a pressure wave in air. C) Light waves have a longer wavelength than radio waves. D) Light waves have a larger amplitude than radio waves. E) None of the above.