# Mastering Physics Assignment 1 Essay

2830 Words Oct 28th, 2013 12 Pages
Assignment 1: Kinematics in 2 and 3 Dimensions
Due: 2:00am on Saturday, September 4, 2010
Note: To understand how points are awarded, read your instructor's Grading Policy.
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Arrow Hits Apple
An arrow is shot at an angle of

above the horizontal. The arrow hits a tree a horizontal distance

away, at the same height above the ground as it was shot. Use

for the

magnitude of the acceleration due to gravity.
Part A
Find

, the time that the arrow spends in the air.

Hint A.1

Find the initial upward component of velocity in terms of D.
Hint not displayed

Hint A.2

Find the time of flight in terms of the initial vertical component of velocity.
Hint not displayed

Hint A.3
…show more content…
Correct

Part B
For two shells fired at the same speed which statement about the horizontal distance traveled is correct? Hint B.1

Two things to consider
Hint not displayed

ANSWER:

The shell fired at a larger angle with respect to the horizontal lands farther away.
The shell fired at an angle closest to 45 degrees lands farther away.
The shell fired at a smaller angle with respect to the horizontal lands farther away.
The lighter shell lands farther away.
Correct

Consider the situation in which both shells are fired at an angle greater than 45 degrees with respect to the horizontal. Remember that enemy ship A is closer than enemy ship B.
Part C
Which shell is fired at the larger angle?
Hint C.1

Consider the limiting case

Hint C.1

Consider the limiting case
Hint not displayed

ANSWER:

A
B
Both shells are fired at the same angle.
Correct

Part D
Which shell is launched with a greater vertical velocity,
ANSWER:

?

A
B
Both shells are launched with the same vertical velocity.
Correct

Part E
Which shell is launched with a greater horizontal velocity,
ANSWER:

?

A
B
Both shells are launched with the same horizontal velocity.
Correct

Part F
Which shell reaches the greater maximum height?
Hint F.1

What determines maximum height?
Hint not displayed

ANSWER:

A
B
Both shells reach the same maximum height.
Correct

Part G
Which shell has the longest travel

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