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Chapter 6: Q44P (page 143)
During an Olympic bobsled run, the Jamaican team makes a turn of radius at a speed of . What is their acceleration in terms of?
The acceleration in terms of g is.
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During a routine flight in 1956, test pilot Tom Attridge put his jet fighter into adive for a test of the aircraft’s 20 mmmachine cannons. While traveling faster than sound at 4000 m altitude, he shot a burst of rounds. Then, after allowing the cannons to cool, he shot another burst at 2000 m; his speed was then344 m/s, the speed of the rounds relative to him was 730 m/s, and he was still in a dive. Almost immediately the canopy around him was shredded and his right air intake was damaged. With little flying capability left, the jet crashed into a wooded area, but Attridge managed to escape the resulting explosion. Explain what apparently happened just after the second burst of cannon rounds. (Attridge has been the only pilot who has managed to shoot himself down.)
A warehouse worker exerts a constant horizontal force of magnitude 85 Non a 40 kgbox that is initially at rest on the horizontal floor of the warehouse. When the box has moved a distance of 1.4 m, its speed is 1.0 m/s. What is the coefficient of kinetic friction between the box and the floor?
A student wants to determine the coefficients of static friction and kinetic friction between a box and a plank. She places the box on the plank and gradually raises one end of the plank. When the angle of inclination with the horizontal reaches, the box starts to slip, and it then slides 2.5 mdown the plank in 4.0 sat constant acceleration. What are
(a) the coefficient of static friction and
(b) the coefficient of kinetic friction between the box and the plank?
A bicyclist travels in a circle of radius 25.0 mat a constant speed of 9.00 m/s. The bicycle–rider mass is 85.0 kg. Calculate the magnitudes of
(a) the force of friction on the bicycle from the road and
(b) the netforce on the bicycle from the road.
In Fig. 6-12, if the box is stationary and the angle between the horizontal and force is increased somewhat, do the following quantities increase, decrease, or remain the same: (a) (b) (c) (d) (e) If, instead, the box is sliding and is increased, does the magnitude of the frictional force on the box increase, decrease, or remain the same?
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