A solitary boy cannot balance on a seesaw with its fulcrum at its midpoint. If the fulcrum is moved to one-quarter the distance from the boy, balance is achieved when the weight of the boy is
A) less than the weight of the seesaw.
B) equal to the weight of the seesaw.
C) more than the weight of the seesaw.
D) need more information
Answer: C
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A pn-junction diode at 300 K produces a current density 1.00×104 A/m2 , with a forward bias of 0.10 V. Calculate the current density for a forward bias of 0.300 V.
What will be an ideal response?
Until recently, most astronomers thought elliptical galaxies were shaped like oblate spheroids
Indicate whether the statement is true or false
A basketball player pushes down with a force of 50 N on a basketball that is inflated to a gauge pressure of 8.0 x 104 Pa. What is the diameter of contact between the ball and the floor?
A) 2.8 cm B) 1.4 cm C) 1.7 cm D) 2.1 cm E) 5.6 cm
An ideal gas at pressure, volume, and temperature, P0, V0, and T0, respectively, is heated to point A, allowed to expand to point B also at A’s temperature 2T0, and then returned to the original condition. The internal energy decreases by 3P0V0/2 going from point B to point
T0. In going around this cycle once, which quantity equals zero?
a.
the net change in internal energy of the gas
b.
the net work done by the gas
c.
the net heat added to the gas
d.
All three are zero.