A 50-? resistor is placed in series with a 40-mH inductor. At what frequency will the current in this circuit lag the applied voltage by exactly 45°?
What will be an ideal response?
0.20 kHz
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A 10-kg brick and a 1-kg apple are dropped in a vacuum. The force of gravity on the brick is
A) the same as the force on the apple. B) 10 times more than the force on the apple. C) one-tenth as much as on the apple. D) zero.
Which variable (period or length) does the graph show to be increasing the fastest? (Note: If they were increasing at the same rate, the graph would be a straight line.)
As an air parcel expands and cools, or compresses and warms, with no interchange of heat with its surroundings, the situation is called
A) temperature equilibrium. B) an adiabatic process. C) stable equilibrium. D) lapse rate.
Gravitational Force: A very dense 1500-kg point mass (A) and a dense 1200-kg point mass (B) are held in place 1.00 m apart on a frictionless table. A third point mass is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third mass is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2)
What will be an ideal response?