Answered: Question 7 A projectile fired from a…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter3: Motion In Two Dimensions

Section: Chapter Questions

Problem 14P

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Question 7

A projectile fired from a gun has initial horizontal and vertical components of velocity equal to 280 m/s and 370 m/s, respectively. Determine the maximum height above the gun that the projectile reaches in its trajectory.

19 m

38 m

7000 m

3500 m

8.You want to throw a water balloon horizontally from the top of a 10 m building and hit a baby sitting 10 m from the base of the building. What should the initial speed be?

1.4 m/s

7 m/s

9 m/s

5 m/s

12.

The coefficient of kinetic friction between the tires of a car and a wet road surface is 0.52. If the car is traveling at an initial speed of 25 m/s, and then slams on the breaks so the car skids straight ahead to a stop, how far does the car skid? Assume the mass of the car to be 1000 kg.

57 m

61 m

123 m

32 m

Expert Solution

Step 1

Given

For Q.7

U_X = 280 m/s

U_Y = 370 m/s

For Q.8

h =10 m

R= 10 m

$F o r Q . 12 u = 25 m / s v = 0 μ = 0.52 m = 1000 k g$

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