Using the energy-time version of the uncertainty principle, estimate the uncertainty in energy of a state with lifetime 10-9 s.
A. 10-2 eV
B. 10-7 eV
C. 10-12 eV
D. 10-15 eV
E. 10-18 eV
B. 10-7 eV
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Angular Momentum: A solid, uniform, horizontal disk with a diameter of 2.0 m and a mass of 4.0 kg freely rotates at 36 rpm about a vertical axis through its center. A small 0.50-kg stone is suddenly dropped onto the disk and sticks to the disk at a distance of 80 cm from the axis of rotation. The figure shows before and after views.(a) Before the stone fell, what was the moment of inertia of the disk about its central axis?(b) After the stone stuck, what was the moment of inertia of the system about the same axis?(c) What is the angular velocity of the disk (in rpm) after the stone fell onto the disk?
What will be an ideal response?
Power: A 6.0-V battery that can store 500.0 J of energy is connected to a resistor. How much charge must flow between the battery's terminals to completely drain the battery if it is fully charged? Assume that the voltage of the battery remains the same until it is totally drained.
A. 83 C B. 0.010 C C. 3000 C D. 0.07 C
What would happen to Earth's temperature if you painted the entire surface of the Earth white?
A) Its temperature would not change. B) Its average temperature would go down. C) Its average temperature would go up.
Assuming that we can measure the apparent brightness of a star, what does the inverse square law for light allow us to do?
A) Calculate the star's luminosity if we know its distance, or calculate its distance if we know its luminosity. B) Determine both the star's distance and luminosity from its apparent brightness. C) Determine the distance to the star from its apparent brightness. D) Calculate the star's surface temperature if we know either its luminosity or its distance.