QUESTION 2 2.1 A block with a mass of 10 kg is sliding along a uniform, rough surface. The surface is horizontal from A to B, but inclined, at an angle of 35° to the horizontal, from B to C. The block is travelling at a speed of 12 m-s1 as it passes point A. The frictional force acting on the block from A to B is 54,9 N. 12 m-s¹ 10 kg 35° A 6 m B Calculate the kinetic energy of the block as it passes point A. (3) 2.1.1 2.1.2 State the work-energy theorem in words. 2.1.3 (2) Calculate the speed of the block as it reaches point B. (4) 2.1.4 The block then slides up the incline from point B and comes to rest at point C. The frictional force acting on the block from B to C is 45,0 N. Use energy principles to calculate the distance, x, from B to C. 2.2 A motor pulls a crate, mass 300 kg, up an incline with a constant force by means of a light, inextensible rope as shown below. The rope runs over a light, frictionless pulley. The crate moves up the incline at a constant speed of 0,5 m-s1. The coefficient of kinetic friction for the crate and inclined plane is 0.19. motor 300 kg 25° (5)
QUESTION 2 2.1 A block with a mass of 10 kg is sliding along a uniform, rough surface. The surface is horizontal from A to B, but inclined, at an angle of 35° to the horizontal, from B to C. The block is travelling at a speed of 12 m-s1 as it passes point A. The frictional force acting on the block from A to B is 54,9 N. 12 m-s¹ 10 kg 35° A 6 m B Calculate the kinetic energy of the block as it passes point A. (3) 2.1.1 2.1.2 State the work-energy theorem in words. 2.1.3 (2) Calculate the speed of the block as it reaches point B. (4) 2.1.4 The block then slides up the incline from point B and comes to rest at point C. The frictional force acting on the block from B to C is 45,0 N. Use energy principles to calculate the distance, x, from B to C. 2.2 A motor pulls a crate, mass 300 kg, up an incline with a constant force by means of a light, inextensible rope as shown below. The rope runs over a light, frictionless pulley. The crate moves up the incline at a constant speed of 0,5 m-s1. The coefficient of kinetic friction for the crate and inclined plane is 0.19. motor 300 kg 25° (5)
College Physics
10th Edition
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter7: Rotational Motion And The Law Of Gravity
Section: Chapter Questions
Problem 32P
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Transcribed Image Text:QUESTION 2
2.1
A block with a mass of 10 kg is sliding along a uniform, rough surface.
The surface is horizontal from A to B, but inclined, at an angle of 35° to
the horizontal, from B to C. The block is travelling at a speed of 12 m-s1
as it passes point A. The frictional force acting on the block from A
to B is 54,9 N.
12 m-s¹
10 kg
35°
A
6 m
B
Calculate the kinetic energy of the block as it passes point A.
(3)
2.1.1
2.1.2
State the work-energy theorem in words.
2.1.3
(2)
Calculate the speed of the block as it reaches point B.
(4)
2.1.4
The block then slides up the incline from point B and comes to rest
at point C. The frictional force acting on the block from B to C
is 45,0 N. Use energy principles to calculate the distance, x,
from B to C.
2.2
A motor pulls a crate, mass 300 kg, up an incline with a constant force
by means of a light, inextensible rope as shown below. The rope runs over
a light, frictionless pulley. The crate moves up the incline at a constant
speed of 0,5 m-s1. The coefficient of kinetic friction for the crate and
inclined plane is 0.19.
motor
300 kg
25°
(5)
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