The distance traveled by a dropped object in free fall is directly proportional to
a. the time squared.
b. its weight.
c. its mass.
d. none of these.
a
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Person X pushes twice as hard against a stationary brick wall as person Y. Which one of the following statements is correct?
A) Both do positive work, but person X does four times the work of person Y. B) Both do positive work, but person X does twice the work of person Y. C) Both do the same amount of positive work. D) Both do zero work. E) Both do positive work, but person X does one-half the work of person Y.
Two blocks hang from strings would around different parts of a 2 kg double pulley as shown. The pivot exerts a normal force FN supporting the double pulley. Assuming the system is not in equilibrium, which statement about FN is true after the system is released from rest? (Use g = 10 N/kg.)
When an external resistor of resistance R1 = 14 ? is connected across the terminals of a battery, there is a current of 6.0 A through the resistor
When a different external resistor of resistance R2 = 64.4 ? is connected instead, the current is 2.0 A. Calculate (a) the emf of the battery and (b) the internal resistance of the battery.