Purchase Solution

A Ball is Thrown

Not what you're looking for?

Ask Custom Question

(1) A ball is thrown horizontally from a height of 20.8m and hits the ground with a speed that is three times its initial speed. What was the initial speed?

(2) A ball is shot from the ground into the air. At a height of 9.1m, the velocity is observed to be V = 7.9i + 5.1j in m/s (i horizontally, j upward). To what maximum height will the ball rise?

(b) What is the velocity of the ball the instant before it hits the ground? That is its i component.

(c) What is the j component?

3. A light plane attains an air speed of 390 km/h. The pilot sets a course for a destination 800km to the north but discovers that the plane must be headed 10 degrees east of north to fly there directly. The plane arrives in 1.86 hours. What was the i component of the wind velocity vector in km/h?

(b) What was the j component of the wind velocity vector?

Purchase this Solution

Solution Summary

This solution includes calculations and answers.

Solution Preview

1. Using the energy method, assume the initial speed is v, and then from the energy method, we can get:

mgh + 1.2mv^2 = 1/2m(3v)^2

9.8*20.8 = 4v^2

We got, v = 7.1 m/s

2. a) using energy method, when the ball go to the ...

Purchase this Solution


Free BrainMass Quizzes
Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

Basic Physics

This quiz will test your knowledge about basic Physics.