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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Asking for help on 9, 10, and 11 if possible ?

Transcribed Image Text:Certainly! Here is the transcription of the text suitable for an educational website, with explanations where necessary:
---
### Physics Problems and Exercises
#### Problem 9
A helicopter is initially traveling East at 11.0 m/s. It undergoes an upward acceleration of 0.96 m/s² for 5.3 seconds.
a. Draw a picture of this situation and draw the 1st kinematic vector equation (for displacement) on top of your picture. Label everything symbolically.
b. What is the helicopter’s displacement in component form?
c. What is the helicopter’s displacement in magnitude and direction form?
#### Problem 10
A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 10 meters from the takeoff point. The kangaroo leaves the ground at a 20° angle. The acceleration of the kangaroo during its jump is 9.8 m/s² down due to gravity.
a. Draw a picture of this situation and then draw the 1st kinematic vector equation (for displacement) on top of your picture. Label everything symbolically.
b. Symbolically find the time it takes for the kangaroo to make this jump. (Hint: Your drawing for part a should show a right triangle. What happens if you take the tangent?)
c. Plug numbers into your answer for part b. How long does it take the kangaroo to make this jump?
d. What is the kangaroo’s takeoff speed?
e. What is the kangaroo’s horizontal speed?
#### Problem 11
In 1780, in what is now referred to as “Brady’s Leap,” Captain Sam Brady of the U.S. Continental Army escaped certain death from his enemies by running horizontally off the edge of the cliff above Ohio’s Cuyahoga River, which is confined at that spot to a gorge. He landed safely on the far side of the river. It was reported that he leapt 22 feet across while falling 20 ft. (1 ft = 0.3048 m). The fastest humans can run about 12 m/s, acceleration due to gravity = 9.8 m/s² down.) Tall tale, or possible?
---
### Explanation of Concepts
**1. Kinematic Vector Equations:** These are mathematical expressions used to describe motion. They are useful in predicting the future position of an object moving under constant acceleration.
**2. Component Form:** This is a way
Expert Solution
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Step 1: Helicopter speed and acceleration is given
Helicopter acceleration in y = 0.96m/s2
Speed in east direction = 11m/s.
Step by stepSolved in 4 steps with 1 images
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