The efficiency of inexpensive solar cells is closest to
A. 1%
B.12%
c. 65%
D. 100%
Answer: B.12%
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Moment of Inertia: The L-shaped object shown in the figure consists of three small masses connected by thin uniform rods, each rod of mass 3.00 kg. Assume that the masses shown are accurate to three significant figures. What is the moment of inertia of this object (a) about the x-axis, and (b) about the y-axis?
What will be an ideal response?
The vertical displacement y(x,t) of a horizontal string aligned along the x-axis is given by the equation y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What are the (a) wavelength and (b) period of this wave?
What will be an ideal response?
Evidence that the universe is expanding is provided by Hubble's Law which states that
A. the farther away a star is from us, the less its luminosity. B. the farther away a star is from us, the less its velocity of recession. C. the farther away a star is from us, the greater its velocity of recession. D. the nearer to us a star is, the greater its velocity of recession.
A power rating printed on a lightbulb assumes a voltage of 120 V is applied to the bulb. If two 100 W bulbs are connected in series to a 120 V source,
A. each bulb radiates 100 W. B. each bulb radiates less than 100 W. C. each bulb radiates more than 100 W. D. no current will pass through the bulbs.