BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Solutions

Chapter
Section
BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A 50.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.20 × 102 m/s from the top of a cliff 142 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? (b) Suppose the projectile is traveling 85.0 m/s at its maximum height of y = 427 m. How much work has been done on the projectile by air friction? (c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up?

(a)

To determine
The initial total mechanical energy of the projectile.

Explanation

Given Info:

The mass of the projectile is 50.0kg .

The angle of the projectile with horizontal is 30.0° .

Initial speed of the projectile is 1.20×102m/s .

The height of the cliff is 142m .

Formula to calculate the initial total mechanical energy is,

(Etot)i=KEi+PEi=12mvi2+mghi

  • m is mass of the projectile
  • vi is the initial speed of the projectile
  • g is acceleration due to gravity
  • hi is the height of the cliff

Substitute 50.0kg for m, 1.20×102m/s for vi , 9

(b)

To determine
The total work done by air friction.

(c)

To determine
The speed of the projectile immediately before it hits the ground.

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

The appetite-stimulating hormone ghrelin is made by the a. brain b. fat tissue c. pancreas d. stomach

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

Name the following molecular compounds a AsBr3 b H2Te c P2O5 d SiO2

General Chemistry - Standalone book (MindTap Course List)

18-52 Complete the equations for these oxidations:

Introduction to General, Organic and Biochemistry