The net force (Fn) acting on the bookshelf is the difference between forces that are acting to it in opposite directions. In the given above, the frictional force, 2.90 N, always acts opposite to the force applied to it, 35 N.
Fn = 35 N - 2.90 N = 32.1 N
Thus, the net force acting to the bookshelf is 32.1N.
For the answer to the question above, <span>When a weather map shows a wind symbol at 270 it indicates that the wind is coming from the WEST.
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Twice as fast, so multiply the kinetic energy of the slower plane by two.
Answer:
Explanation:
At the lowest point velocity is zero
loss of potential energy = gain of spring energy
= mgh = 1/2 k h² , h is vertical downward displacement , k is spring constant
2 mg = k h
h = 2mg / k
= (2 x .2 x 9.8) / 50
= .0784 m
P E ( gravitational) = - mgh
= - .2 x 9.8 x .0784
= - .1536 J
spring PE = + .1536 J
Total PE = 0
b )
At mid point ie at h = .0392 m
gravitational PE = .2 X 9.8 X .0392
= - .0768 J
Elastic PE = 1/2 X 50 X .0392² = .0384 J
Total = - .0768 J + .0384 J
= - .0384 J
At mid point total energy = 0
- .0384 + KE = 0
KE = .0384 J
c )
1/2 m v ² = .0384
v² = 2 x .0384 / .2
= .384
v = .6196 m / s
62 cm / s
