A race track is constructed such that two arcs of radius 80 m at A and 40 m at B are joined by two stretches of straight tracks as in the figure. In a particular trial run, a driver traveled at a constant speed of 50 m/s for one complete lap. In this case, the ratio of the tangential acceleration at A to that at B is

5

Physics & Space Science

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What is the solar wind?

A) a stream of charged particles flowing outward from the surface of the Sun B) the uppermost layer of the Sun, which lies just above the corona C) the strong wind that blows sunspots around on the surface of the Sun D) the wind that causes huge arcs of gas to rise above the Sun's surface

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The ideal shape for the primary mirror of a telescope is concave parabolic

Indicate whether the statement is true or false

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Determine ? when I = 0.50 A and R = 12 ?.

A. 12 V B. 24 V C. 30 V D. 15 V E. 6.0 V

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Which one of the following is an accurate statement about light?

A) When light strikes a surface at the critical angle, all the light passes through the surface. B) When light strikes a surface at the critical angle, only the reflected light is 100% polarized. C) When light strikes a surface at Brewster's angle, it is completely reflected at the surface. D) When light strikes a surface at Brewster's angle, only the reflected light is 100% polarized. E) When light strikes a surface at Brewster's angle, the reflected and transmitted light are both 100% polarized.

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