Free Fall: To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge? Neglect air resistance.
A. 10 m
B. 14 m
C. 26 m
D. 32 m
E. 52 m
Answer: C
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Equilibrium: Three objects are connected by weightless flexible strings as shown in the figure. The pulley has no appreciable mass or friction, and the string connected to the block on the horizontal bench pulls on it parallel to the bench surface. The coefficients of friction between the bench and the block on it are µs = 0.66 and µk = 0.325. You observe that this system remains at rest.(a) Find the mass of the hanging object A.(b) What is the magnitude of the friction force on the block on the bench?
Fill in the blank(s) with the appropriate word(s).
What is the angular resolution of the human eye?
A) about 1 arcminute, or 1/60 of a degree B) about 1 degree C) about 1 arcsecond (1/3600 of a degree) D) about 1 milliarcsecond
What color is an H I region?
A) red from ionized hydrogen's alpha transition, such as in the Orion Nebula B) red from reddening due to dust C) colorless; it emits in the radio region D) blue from the scattering of light off the tiny atoms, such as around the Pleiades E) blue from ionized helium's alpha transition, such as the Horsehead Nebula
A pinhole cameras has no lens. The tiny pinhole opening insures that rays of light from different parts of an object
A) overlap. B) don't overlap. C) bend to a focus.