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Chapter 1: Q1DQ (page 123)
Can a body be in equilibrium when only one force acts on it? Explain.
As the net force on the object is not zero, the body is not in equilibrium.
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The dwarf planet Pluto has an elliptical orbit with a semi-major axis of and eccentricity .
(a) Calculate Pluto鈥檚 orbital period. Express your answer in seconds and in earth years.
(b) During Pluto鈥檚 orbit around the sun, what are its closest and farthest distances from the sun?
A car and a truck start from rest at the same instant, with the car initially at some distance behind the truck. The truck has a constant acceleration of, and the car has an acceleration of. The car overtakes the truck after the truck has moved. (a) How much time does it take the car to overtake the truck? (b) How far was the car behind the truck initially? (c) What is the speed of each when they are abreast? (d) On a single graph, sketch the position of each vehicle as a function of time. Takeat the initial location of the truck.
Question: The purity of gold can be tested by weighing it in air and in water. How? Do you think you could get away with making a fake gold brick by gold-plating some cheaper material?
A physics professor leaves her house and walks along the sidewalk toward campus. After 5 min, it starts to rain, and she returns home. Her distance from her house as a function of time is shown in Fig. E2.10 At which of the labeled points is her velocity (a) zero? (b) constant and positive? (c) constant and negative? (d) increasing in magnitude? (e) decreasing in magnitude?
How many times does a typical person blink her eyes in a lifetime?
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