A child is riding a tricycle. The pedals are attached directly to the front wheel, which has a radius of 13 cm. The rear wheels are smaller, and have a radius of 8.0 cm
If the child is pedaling at 16 rpm, what is the angular speed of the rear wheels? A) 15 rpm
B) 26 rpm
C) 24 rpm
D) 20 rpm
E) 50 rpm
B
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The conservation of energy equation must include
A. Work done on the system B. Thermal energy added to the system C. Thermal energy leaving the system D. Work done by the system. E. All of these are correct.
A steel hanger with solid cross section has horizontal force P 5 5.5 kN applied at free end D. Dimension variable b 5 175 mm and allowable normal stress is 150 MPa. Neglect self-weight of the hanger. The required diameter of the hanger is approximately:
(A) 5 cm
(B) 7 cm
(C) 10 cm
(D) 13 cm
Assume that the average rate of 1-km sized asteroids hitting the Earth is about 1 every million years. The chance of the Earth being hit by a 1-km sized asteroid in the next 100 years is about:
A) one in ten thousand. B) one in a million. C) zero. D) one in 100 million. E) inevitable, it has to happen sometime.
How much kinetic energy does a 0.30-kg stone have if it is thrown at
A) 290 J B) 580 J C) 440 J D) 510 J