Which of the following methods describes the transit method for detecting extrasolar planets?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky
B) detection of Doppler shifts in the spectra of the parent stars
C) detection of brightness changes in a star as a planet passes in front of it
D) detection of reflected starlight
C
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If the electric field just outside a thin conducting sheet is equal to 1.5 N/C, determine the surface charge density on the conductor.
A. 53 pC/m2 B. 27 pC/m2 C. 35 pC/m2 D. 13 pC/m2 E. 6.6 pC/m2
A race car goes around a curve at 50 m/s. The radius of the curve is 400 m. What is the car's acceleration?
A sled weighs 10.0 kg It is held in place on a frictionless 20.0 degree slope by a rope attached to a stake at the top of the slope. Find the tension in the rope if it is parallel to the slope.
A. 47.9 N B. 37.4 N C. 94.1 N D. 33.5 N E. 23.8 N
Light from a helium-neon laser (? = 632.8 nm) is incident upon a 0.200-mm wide slit. Find the total width of the central maximum 2.00 m from the slit