Two 40-N weights hang from the same siring. What is the tension in the string? A

Question

Two 40-N weights hang from the same siring. What is the tension in the string? A. zero B. 20 N C. 40 N D. 80 N You are holding a book at rest in your hand. The book weighs 15 N. Which of Newton's laws tells you that your hand must be exerting an upward force of 15 N on the book? A. The Law of Universal Gravitation. B. The Second Law (F = ma). C. The Action-Reaction Principle According to Newton's second law for rotational motion, the angular acceleration experienced by an object is directly proportional to: A. the object's size. B. its moment of inertia. C. the net applied torque. A car is speeding up while pulling a trailer along a level highway. Which of the following statements is true? A. The car's force on the trailer equals the trailer's force on the car. B. The car's force on the trailer is less than the trailer's force on the car. C. The car's force on the trailer is greater than the trailer's force on the car. If two bodies arc in thermal equilibrium, you know that they A. contain the same thermal energy. B. have the same specific heat capacity. C. are at the same temperature. D. exert the same pressure. The quantity that is most directly related to the degree of disorder in a system is its A. thermal energy B. entropy C. specific heat D. kinetic energy E. temperature When an ice skater spins faster and faster at the end of her routine by bringing her arms in closer to her body, her ____ increases because she is decreasing her ____. A. angular momentum/mass B. angular momentum/moment of inertia C. angular momentum/angular velocity D. angular velocity/moment of inertia E. angular velocity/angular momentum

Explanation / Answer

8.

Let tension in string is T.

Consider mass less pulley system.

Consider the forceequilibrium in vertical direction.

T+T=40+40

So, T=40 N

Hence, option (C) is correct.

9.

Due tp the Action -reaction principal . Our hand applied a equal and opposite reaction force.

Hence, option (c) is correct.

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