Physics
7th Edition
ISBN: 9780321929013
Author: Douglas C. Giancoli
Publisher: PEARSON
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Chapter 4, Problem 70GP
( a )
To determine
The scale reading (in N and in kg) when the elevator is at rest.
( b )
To determine
The scale reading (in N and in kg) when the elevator is climbing at a constant speed of 3.0 m/s.
( c )
To determine
The scale reading (in N and in kg) when the elevator is descending at 3.0 m/s.
( d )
To determine
The scale reading (in N and in kg) when the elevator is accelerating upward at
( e )
To determine
The scale read (in N and in kg) when the elevator is accelerating downward at
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No chatgpt pls
need help with the first part
A ball is thrown with an initial speed v, at an angle 6, with the horizontal. The horizontal range of the ball is R, and the ball reaches a maximum height R/4. In terms of R and g, find the following.
(a) the time interval during which the ball is in motion
2R
(b) the ball's speed at the peak of its path
v=
Rg 2
√ sin 26, V 3
(c) the initial vertical component of its velocity
Rg
sin ei
sin 20
(d) its initial speed
Rg
√ sin 20
×
(e) the angle 6, expressed in terms of arctan of a fraction.
1
(f) Suppose the ball is thrown at the same initial speed found in (d) but at the angle appropriate for reaching the greatest height that it can. Find this height.
hmax
R2
(g) Suppose the ball is thrown at the same initial speed but at the angle for greatest possible range. Find this maximum horizontal range.
Xmax
R√3
2
Chapter 4 Solutions
Physics
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