Suppose a 0.30-kg mass on a spring that has been compressed 0.10 m has elastic potential energy of 1.5 J. What is the spring constant?
a. 10 N/m
c. 200 N/m
b. 20 N/m
d. 300 N/m
D
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A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the resistance in this circuit?
A) 100 ? B) 60 ? C) 150 ? D) 200 ? E) 120 ?
In a LRC circuit, a second capacitor is connected in series with the capacitor previously in the circuit. What is the effect of this change on the impedance of the circuit?
A) It increases. B) It decreases. C) It does not change. D) It increases for frequencies below resonance and decreases for frequencies above resonance. E) It decreases for frequencies below resonance and increases for frequencies above resonance.
The torque required to turn the crank on an ice cream maker is 4.50 N ? m. How much work does it take to turn the crank through 300 full turns?
A) 2120 J B) 2700 J C) 4240 J D) 1350 J E) 8480 J
Which of the following can never be negative?
A) acceleration of gravity B) displacement C) instantaneous speed D) average velocity E) instantaneous velocity