A convex mirror has
A)
no focal length.
B)
a positive or negative focal length depending on the object position.
C)
a positive focal length.
D)
a negative focal length.
E)
a positive or negative focal length depending on the object size.
D
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The magnetic field in a cyclotron is 0.50 T. What is the radius of the vacuum chamber for a maximum proton velocity of 
A. 0.11 m B. 1.2 m C. 0.21 m D. 0.013 m
According to the graph, an object 10 kilometers across hits Earth __________.
A. about once every 1 million years B. about once every 100 million years C. about once every 1 billion years D. just once in Earth's history
A piano wire has a radius of 0.500 mm. One end is fixed and the other is wrapped around a tuning peg that has a diameter of 3.00 mm and is 70.0 cm away. After the wire just becomes taut, the peg is given one and a half turns
What is the fundamental frequency of oscillation of the wire? The density of steel is 7860 kg/m3 and Young's modulus for steel is 20 × 1010 N/m2. A) 1020 Hz B) 512 Hz C) 2050 Hz D) 342 Hz E) 256 Hz
In the Compton effect, a photon of wavelength 
and frequency f is scattered from an electron. Initially, at rest
A. the electron gains energy from the photon so that the scattered photon's wave length is less than
B. the electron gives energy to the scattered photon so the photon's frequency is greater than f.
C. momentum is not conserved, but energy is conserved.
D. the photon loses energy so that the scattered photon has a frequency less than f.