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A 5.1-kg block is pulled along a frictionless floor by a cord that exerts a force P = 12 N at an angle θ = 25 0 above the horizontal, as shown in Fig. (a) What is the acceleration of the block? (b) The force P is slowly increased. What is the value of P just before the block is lifted off the floor? (c) What is the acceleration of the block just before it is lifted off the floor?

A 5.1-kg block is pulled along a frictionless floor by a cord that exerts a force P = 12 N at an angle θ = 250 above the horizontal, as shown in Fig. (a) What is the acceleration of the
block? (b) The force P is slowly increased. What is the value of P just before the block is lifted off the floor? (c) What is the acceleration of the block just before it is lifted off the floor?

Grade:11

1 Answers

Aditi Chauhan
askIITians Faculty 396 Points
8 years ago
(a)
236-634_1.PNG
Therefore, the horizontal acceleration of the block is 2.2m/s2 .
(b)
The weight of the block is:

236-2207_1.PNG
Round off to three significant figures,
P = 119 N
Therefore the magnitude of net force on the block when it is about to lift is119 N.
(c)
236-1279_1.PNG
Therefore, the acceleration of the block when it is about to lift is 21 m/s2.

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