Compared to the masses of its separate protons and neutrons, the total mass of a stable nucleus is always
A)
less.
B)
the same.
C)
greater.
D)
zero.
E)
varies from atom to atom.
A
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An LR circuit contains an ideal 60-V battery, a 51-H inductor having no resistance, a 21-? resistor, and a switch S, all in series
Initially, the switch is open and has been open for a very long time. At time t = 0 s, the switch is suddenly closed. When the voltage across the resistor is equal to the voltage across the inductor, what is the current in the circuit? A) 1.4 A B) 0.57 A C) 1.1 A D) 0.86 A E) 1.7 A
An object attached to an ideal spring executes simple harmonic motion. If you want to double the total energy of the object-spring system, you could
A) double the amplitude of vibration. B) double the spring constant of the spring. C) double both the amplitude and spring constant. D) double the mass of the object. E) double both the mass of the object and amplitude of vibration.
Simple Pendulum: A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant acceleration?
A. The period does not change. B. The period increases. C. The period decreases. D. The period becomes zero. E. The period increases if the upward acceleration is more than g/2 but decreases if the upward acceleration is less than g/2.
When you walk, you push on the floor to the left and the floor
A) also pushes on you to the left. B) pushes you to the right. C) both of these simultaneously. D) can only wish it could push on you. E) none of the above