Part (a) Explanation Given: Mass of base baseball = 0.145 kg Initial height of baseball from ground =12 .0 m Final height of baseball from ground =0 .0 m Initial speed of base ball =0 m/s Final speed of baseball during hitting the ground =8 .00 m/s Formula Used: Conservation of mechanical energy P . E 1 + K . E 1 = P . E 2 + K . E 2 W N C = Δ K E + Δ P E W N C : Work done by non-conservative forces. Δ K.E : change in kinetic energy Δ P.E : change in potential energy Calculation: Initial P.E ( P . E 1 ) = m g h 1 = ( 0 .145 kg ) × ( 9 .8 m/s 2 ) × ( 12 .0 m ) Initial K.E ( K . E 1 ) = 1 2 m v 1 2 = 1 2 ( 0 .145 kg ) × ( 0 .0 m/s ) 2 Final P.E ( P . E 2 ) = m g h 2 = ( 0 Part (b) To determine The average force of air resistance exerted on it.

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ISBN: 9780321921741

Author: GIANCOLI

Publisher: PEARSON

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Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.

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Chapter 6, Problem 49P

Part (a)

To determine

ToDetermine:The speed of baseball with which it would hit the ground.

Part (b)

To determine

The average force of air resistance exerted on it.

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Chapter 6, Problem 48P

Chapter 6, Problem 50P

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Three point-like charges are placed at the corners of a square as shown in the figure, 28.0 cm on each side. Find the minimum amount of work required by an external force to move the charge q1 to infinity. Let q1=-2.10 μC, q2=+2.40 μС, q3=+3.60 μC.

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ToDetermine: The speed of baseball with which it would hit the ground.