21. The diagram shows a 0.12-kg square block at four positions along a track. Th
ID: 1397027 • Letter: 2
Question
21.
The diagram shows a 0.12-kg square block at four positions along a track. The track is frictionless between points A and B. Elsewhere, the coefficient of static friction on the block is 0.26.
Initially, the block is held in place against a spring by a horizontal external force of magnitude 35 N. Then the external force is removed, and the block is projected forward with speed V1=1.2m/s. The block descends a ramp and has speed V2=1.4m/s at the bottom. At point C, its speed is V3=1.4m/s. The block stops at point D.
What is the initial compression of the spring?
0.99 cm
0.49 cm
0.26 cm
0.67 cm
0.18 cm
36.
The diagram shows a 0.74-kg square block at four positions along a track. The track is frictionless between points A and B. Elsewhere, the coefficient of static friction on the block is 0.36.
Initially, the block is held in place against a spring by a horizontal external force of magnitude 29 N. Then the external force is removed, and the block is projected forward with speed V1=1.2m/s. The block descends a ramp and has speed V2=1.9m/s at the bottom. At point C, its speed is V3=1.4m/s. The block stops at point D.
What is the height h of the ramp?
2.6 m
82 cm
1.5 m
34 cm
11 cm
37.
1.33h
h
h/2
L
39.
A total of 55 J of work is needed to stretch a spring from x = 0.40m to x = 2.7m , in which x is displacement from equilibrium. What is the value of the spring constant?
33 N/m
49 N/m
24 N/m
15 N/m
40.
A mass of 9.22 kg gains 506 J of gravitational potential energy. To what height was it lifted?
55 m
27 m
4.6 m
5.6 m
21.
The diagram shows a 0.12-kg square block at four positions along a track. The track is frictionless between points A and B. Elsewhere, the coefficient of static friction on the block is 0.26.
Initially, the block is held in place against a spring by a horizontal external force of magnitude 35 N. Then the external force is removed, and the block is projected forward with speed V1=1.2m/s. The block descends a ramp and has speed V2=1.4m/s at the bottom. At point C, its speed is V3=1.4m/s. The block stops at point D.
What is the initial compression of the spring?
0.99 cm
0.49 cm
0.26 cm
0.67 cm
0.18 cm
36.
The diagram shows a 0.74-kg square block at four positions along a track. The track is frictionless between points A and B. Elsewhere, the coefficient of static friction on the block is 0.36.
Initially, the block is held in place against a spring by a horizontal external force of magnitude 29 N. Then the external force is removed, and the block is projected forward with speed V1=1.2m/s. The block descends a ramp and has speed V2=1.9m/s at the bottom. At point C, its speed is V3=1.4m/s. The block stops at point D.
What is the height h of the ramp?
2.6 m
82 cm
1.5 m
34 cm
11 cm
Explanation / Answer
40. answer
mass m = 9.22 kg
gravitational PE = 506 J
height = ?
PE = m X g X h
506 = 9.22 X 9.8 X h
then h = 506/90.356
h = 5.59 m this height will be lifted.
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