|| A tetherball leans against the smooth, frictionless post to which it is attached. (See Figure 5.46 ) The string is attached to the surface of the ball such that a line along the string passes through the center of the ball. The string is 1.40 m long and the ball has a radius of 0.110 m with mass 0.270 kg. (a) Make a free-body diagram of the ball. (b) What is the tension in the rope? (c) What is the force the pole exerts on the ball? Figure 5.46 Problem 12.
|| A tetherball leans against the smooth, frictionless post to which it is attached. (See Figure 5.46 ) The string is attached to the surface of the ball such that a line along the string passes through the center of the ball. The string is 1.40 m long and the ball has a radius of 0.110 m with mass 0.270 kg. (a) Make a free-body diagram of the ball. (b) What is the tension in the rope? (c) What is the force the pole exerts on the ball? Figure 5.46 Problem 12.
|| A tetherball leans against the smooth, frictionless post to which it is attached. (See Figure 5.46) The string is attached to the surface of the ball such that a line along the string passes through the center of the ball. The string is 1.40 m long and the ball has a radius of 0.110 m with mass 0.270 kg. (a) Make a free-body diagram of the ball. (b) What is the tension in the rope? (c) What is the force the pole exerts on the ball?
I Review | Constants
You find it takes 210 N of horizontal force to move an
unloaded pickup truck along a level road at a speed of
2.4 m/s. You then load up the pickup and pump up its tires
so that its total weight increases by 42% while the coefficient
of rolling friction decreases by 19%.
Part A
Now what horizontal force will you need to move the pickup along the same road at the same speed? The speed is low enough that you can ignore air
resistance.
Express your answer using two significant figures.
Πνα ΑΣφ
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A 3.0-kg box is held at rest against a vertical wall by a pushing force from my hand. Use g = 10 m/s². Match the anwers with questions. (Hint: Draw a proper free-body diagram.)
120 N
3 kg
What is the magnitude and direction of the weight force on the box from the
earth?
What is the magnitude and direction of the pushing force on the box from the
hand?
◆ What is the magnitude and direction of the normal force on the box from the
wall?
What is the magnitude and direction of the friction force on the box from the
wall?
What is the net force on the box?
A. 120 N, down
B. 30 N, to the left
C. zero, therefore no direction
D. 30 N, down
E. 120 N, to the left
F. 30 N, up
G. 120 N, up
H. 120 N, to the right
I. none of the given
J. 30 N, to the right
Two blocks, with masses m=3.6 kg and M=7.1 kg, are connected by a lightweight wire that's shown in the picture. The incline makes an angle of 55 degrees with the horizontal and the coefficient of friction between each block and the surface is 0.200. Find a) the acceleration of the blocks and b) the tension in the string.
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