While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its vertical component of velocity
A) increases.
B) remains unchanged.
C) decreases.
Answer: C
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Resistance and Resistivity: Consider two copper wires of equal length. One wire has twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A. The thicker wire has twice the resistance of the thinner wire. B. The thicker wire has eight times the resistance of the thinner wire. C. The thicker wire has one-half the resistance of the thinner wire. D. The thicker wire has four times the resistance of the thinner wire. E. The thicker wire has one-fourth the resistance of the thinner wire.
Solenoid: An ideal solenoid having 200 turns and carrying a current of 2.0 A is 25 cm long. What is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
Fill in the blank(s) with the appropriate word(s).
Red light has a lower energy per photon than blue light. Therefore, red light has
A) higher frequency, shorter wavelength than blue light. B) lower frequency, longer wavelength than blue light. C) lower frequency, shorter wavelength than blue light. D) higher frequency, longer wavelength than blue light.
What two energy transport mechanisms, in order from outside the core to the surface, is found in the Sun?
A) Convection, conduction B) Fadiative diffusion, convection C) Conduction, radiative diffusion D) Fadiative diffusion, conduction E) Conduction, convection