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Chapter 6: Q14 CQ (page 220)
Is there a real force that throws water from clothes during the spin cycle of a washing machine? Explain how the water is removed.
In washing machine water doesn’t experience any force but cloth does that is centrifugal force which work on cloths.
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(a) What is the acceleration due to gravity on the surface of the Moon?
(b) On the surface of Mars? The mass of Mars is \({\bf{6}}.{\bf{418}} \times {\bf{1}}{{\bf{0}}^{{\bf{23}}}}{\bf{kg}}\) and its radius is\({\bf{3}}.{\bf{38}} \times {\bf{1}}{{\bf{0}}^{\bf{6}}}{\bf{m}}\).
Action at a distance, such as is the case for gravity, was once thought to be illogical and therefore untrue. What is the ultimate determinant of the truth in physics, and why was this action ultimately accepted?
(a) What is the period of rotation of Earth in seconds?
(b) What is the angular velocity of Earth?
(c) Given that Earth has a radius ofat its equator, what is the linear velocity at Earth’s surface?
Unreasonable Results (a) Calculate the minimum coefficient of friction needed for a car to negotiate an unbanked \({\bf{50}}.{\bf{0}}{\rm{ }}{\bf{m}}\) radius curve at\({\bf{30}}.{\bf{0}}{\rm{ }}{\bf{m}}/{\bf{s}}\). (b) What is unreasonable about the result? (c) Which premises are unreasonable or inconsistent?
Space debris left from old satellites and their launchers is becoming a hazard to other satellites
(a) Calculate the speed of a satellite in an orbit900 km above Earth’s surface.
(b) Suppose a loose rivet is in an orbit of the same radius that intersects the satellite’s orbit at an angle ofrelative to Earth. What is the velocity of the rivet relative to the satellite just before striking it?
(c) Given the rivet is 3.00 mmin size, how long will its collision with the satellite last?
(d) If its mass is0.500 g, what is the average force it exerts on the satellite? (e) How much energy in joules is generated by the collision? (The satellite’s velocity does not change appreciably, because its mass is much greater than the rivet’s.)
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