College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Chapter 9, Problem 13PE
Suppose a 900-kg car is on the bridge in Figure 9.34 with its center of mass halfway between the hinges and the cable attachments. (The bridge is supported by the cables and hinges only.) (a) Find the force in the cables. (b) Find the direction and magnitude of the force exerted by the hinges on the bridge.
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Suppose a 900-kg car is on the bridge in Figure shown with its center of mass halfway between the hinges and the cable attachments. (The bridge is supported by the cables and hinges only.) (a) Find the force in the cables. (b) Find the direction and magnitude of the force exerted by the hinges on the bridge.
The forearm shown below is positioned at an angle with respect to the upper arm, and a 5.6 kg mass is held in the hand. The total mass of the forearm and hand is 2.1 kg, and their center of
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5.6 kg
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37.5 cm
4.0 cm
(a) What is the magnitude of the force (in N) that the biceps muscle exerts on the forearm for 0-60%7
N
(b) What is the magnitude of the force on the elbow joint (in N) for the same angle?
N
(c) How do these forces depend on the angle 07
The force that the biceps muscle exerts increases and the force on the elbow joint decreases as increases.
They both decrease as @ increases.
They both increase as increases.
They do not depend on 0.
The force that the biceps muscle exerts decreases and the force on the elbow joint increases as increases.
A 1 530-kg automobile has a wheel base (the distance between the axles) of 2.80 m. The automobile's center of mass is on the centerline at a point 1.15 m behind the front axle. Find the force exerted by the ground on each wheel.
Chapter 9 Solutions
College Physics
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