Chapter 1: Q8DQ (page 123)
Some people say that the “force of inertia” (or “force of momentum”) throws the passengers forward when a car brakes sharply. What is wrong with this explanation?
The breaks should be applied suddenly and not sharply.
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Starting with the definition 1 in. = 2.54 cm, find the number of (a) kilometers in 1.00 mile and (b) feet in 1.00 km.
Given two vectorsand, (a) find the magnitude of each vector; (b) use unit vectors to write an expression for the vector difference; and (c) find the magnitude of the vector difference. Is this the same as the magnitude of? Explain.
A small rock is thrown vertically upward with a speed of22.0 m/s from the edge of the roof of a 30.0-m-tall building. Therock doesn’t hit the building on its way back down and lands onthe street below. Ignore air resistance. (a) What is the speed of therock just before it hits the street? (b) How much time elapses fromwhen the rock is thrown until it hits the street?
A cylindrical bucket, open at the top, is 25.0 cm high and 10.0 cm in diameter. A circular hole with a cross-sectional area 1.50 cm2 is cut in the center of the bottom of the bucket. Water flows into the bucket from a tube above it at the rate of 2.40 x 10-4m3/s. How high will the water in the bucket rise?
If ,what must be true about the directions and magnitudes of and if ? What must be true about the directions and magnitudes of role="math" localid="1647990633202" and if ?
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