A 20 kg box is resting on horizontal surface initially. Then a F = 50 N force pulls on the box by a cord at an angle of 20 degrees above horizontal. The kinetic frictional coefficient is 0.20. 6. What is the horizontal component of the force Fx = ? FN F=5ON a. 47 N b. 17.1 N с. 18.2 N d. 29 N -s Fx 7. What is the normal force acting on the box? a. 47 N b. 179 N c. 196 N d. 125 N 8. What is the frictional force fy = ? a. 25 N b. 39.2 N c. 9.4 N d. 36 N

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A 20 kg box is resting on horizontal surface initially. Then a F = 50 N force pulls on the box by a cord at an angle of 20 degrees above horizontal. The kinetic frictional coefficient is 0.20.

A 20 kg box is resting on horizontal surface initially. Then a F = 50 N force pulls on the box by a cord at an
angle of 20 degrees above horizontal. The kinetic frictional coefficient is 0.20.
6. What is the horizontal component of the force Fx =?
FN
F=5ON
a. 47 N
b. 17.1 N
c. 18.2 N
d. 29 N
Fx
7. What is the normal force acting on the box?
b. 179 N
a. 47 N
c. 196 N
d. 125 N
8. What is the frictional force fy = ?
a. 25 N
b. 39.2 N
c. 9.4 N
d. 36 N
9. What is the magnitude of acceleration of the box, a=?
a. 0.20 m/sec?
b. 0.44 m/sec?
c. 0.55 m/sec?
d. 1.1 m/sec?
10. What is the kinetic energy of the box after 3.0 seconds? (hint: calculate the velocity first v = ? )
c. 27.2 J
а. 3.6 J
b. 17.4 J
d. 109 J
11. What is the work done by the force F in 3.0 second? (hint: calculate the distance first, d = ?)
d. 102 J
a. 41.3 J
b. 116 J
с. 124 J
Transcribed Image Text:A 20 kg box is resting on horizontal surface initially. Then a F = 50 N force pulls on the box by a cord at an angle of 20 degrees above horizontal. The kinetic frictional coefficient is 0.20. 6. What is the horizontal component of the force Fx =? FN F=5ON a. 47 N b. 17.1 N c. 18.2 N d. 29 N Fx 7. What is the normal force acting on the box? b. 179 N a. 47 N c. 196 N d. 125 N 8. What is the frictional force fy = ? a. 25 N b. 39.2 N c. 9.4 N d. 36 N 9. What is the magnitude of acceleration of the box, a=? a. 0.20 m/sec? b. 0.44 m/sec? c. 0.55 m/sec? d. 1.1 m/sec? 10. What is the kinetic energy of the box after 3.0 seconds? (hint: calculate the velocity first v = ? ) c. 27.2 J а. 3.6 J b. 17.4 J d. 109 J 11. What is the work done by the force F in 3.0 second? (hint: calculate the distance first, d = ?) d. 102 J a. 41.3 J b. 116 J с. 124 J
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