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
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Newton's Second Law in 1 Dimension: A certain aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is a constant 445,000 N, what is the speed of the airplane 10.0 s later?
A. 10.0 m/s B. 12.2 m/s C. 14.0 m/s D. 18.0 m/s E. 20.0 m/s
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?
A) the red beam B) the violet beam C) It is the same for both beams.
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?
A) 38.7 Hz B) 1500 Hz C) 56.7 Hz D) 102 Hz E) 3.75 Hz
According to this plot, which is the third most abundant element in the universe?
A) boron B) oxygen C) helium D) lithium E) hydrogen