COLLEGE PHYSICS
2nd Edition
ISBN: 9781711470832
Author: OpenStax
Publisher: XANEDU
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Chapter 9, Problem 8PE
To determine
(a)
The magnitude and direction of the force on each foot of the horse.
To determine
(b)
The minimum coefficient of friction between the hooves and the ground.
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A meter stick has a mass of 0.5 kg and a center of mass at the 50 cm mark. Using two fingers, one at the 10 cm mark and the other at the 40 cm mark, you hold the meter stick in a stationary horizontal position. Find the forces that your fingers put on the meter stick.
To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 4.60 m apart.
(a) If the left scale reads 349 N, and the right scale reads 164 N, find the student's mass.
kg
(b) Find the distance from the student's head to his center of mass.
A 3000-lb car is parked on a 30° slope, facing uphill. The center of mass of the car is halfway between the front
and rear wheels and is 2 ft above the ground. The wheels are 8 ft apart. Find the normal force exerted by the road
on the front wheels and on the rear wheels.
0 = 30°
l = 2 ft
2 = 4 ft
mg
Hints :
The car is in stationary equilibrium, so :
1) the total force on the car must be 0 (i.e., along the incline and perpendicular to it),
2) the total torque about any point must be 0. (choose as point of rotation the center of mass)
Remember friction is: f = µ N
Three equations , three unknowns. Solve for N1 and N2.
Chapter 9 Solutions
COLLEGE PHYSICS
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