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Chapter 9: Q.69 (page 230)

In Problems 67through 69you are given the equation(s) used to solve a problem. For each of these, you are to

a. Write a realistic problem for which this is the correct equation(s).

b. Finish the solution of the problem.

T-(1500kg)(9.8m/s2)=(1500kg)(1m/s2)P=T(2.0m/s)

Short Answer

Expert verified

a. The acceleration of the elevator with mass 1500kgis 1m/s2. The velocity of elevator is2m/s.

b. The power of motor is32.4kW

Step by step solution

01

Content Introduction

Mass is a fundamental feature of all matter, and mass is a quantitative measure of it. A force is a push or pull on an object caused by the interaction of the thing with another object. The pace at which the location changes is called velocity.

02

Explanation (Part a)

The acceleration of elevator with mass 1500kgis 1m/s2.The velocity of elevator is2m/s.

03

Explanation (Part b)

The tension in string is

T=m(g+a)T=(1500kg)[(9.8m/s2)+(1m/s2)]T=1.62×104N

The power of the motor is

P=T.VP=(1.62×104N)(2m/s)P=32400WP=32.4kW

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