A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2. The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?

A. 39 cm/s
B. 42 cm/s
C. 45 cm/s
D. 35 cm/s
E. 53 cm/s


Answer: B

Physics & Space Science

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A beam of red light and a beam of violet light each deliver the same power on a surface. For which beam is the number of photons hitting the surface per second the greatest?

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A 60.0-cm long string with a mass 8.00 g has a tension 200 N. What is the fundamental frequency of this string?

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According to this plot, which is the third most abundant element in the universe?

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