270171
A block of mass \(20 \mathrm{~kg}\) is pushed with a horizontal force of \(90 \mathrm{~N}\). If the coefficient of static and kinetic friction are 0.4 and 0.3 , the frictional force acting on the block is \(\left(g=10 \mathrm{~ms}^{-2}\right)\)
1 \(90 \mathrm{~N}\)
2 \(80 \mathrm{~N}\)
3 \(60 \mathrm{~N}\)
4 \(30 \mathrm{~N}\)
Explanation:
\(f_{k}=\mu_{k} N, N=m g \quad\)
Laws of Motion
270172
A force of \(150 \mathrm{~N}\) produces an acceleration of \(2 \mathrm{~ms}^{-2}\) in a body and a force of \(200 \mathrm{~N}\) produces an acceleration of \(3 \mathrm{~ms}^{-2}\). The mass of the body and the coefficient of kinetic friction are
1 \(50 \mathrm{~kg} ; 0.1\)
2 \(25 \mathrm{~kg} ; 0.1\)
3 \(50 \mathrm{~kg} ; 0.5\)
4 \(50 \mathrm{~kg} ; 0.2\)
Explanation:
\(F-f=m a, f=\mu_{k} m g\)
Laws of Motion
270173
A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25 , the maximum percentage of the length of the chain that can hang over one edge of the table is
270214
The coefficient of friction between a car wheels and a roadway is 0.5 The least distance in which the car can accelerate from rest to a speed of\(72 \mathrm{kmph}\) is \(\left(\mathrm{g}=10 \mathrm{~ms}^{-2}\right)\)
270171
A block of mass \(20 \mathrm{~kg}\) is pushed with a horizontal force of \(90 \mathrm{~N}\). If the coefficient of static and kinetic friction are 0.4 and 0.3 , the frictional force acting on the block is \(\left(g=10 \mathrm{~ms}^{-2}\right)\)
1 \(90 \mathrm{~N}\)
2 \(80 \mathrm{~N}\)
3 \(60 \mathrm{~N}\)
4 \(30 \mathrm{~N}\)
Explanation:
\(f_{k}=\mu_{k} N, N=m g \quad\)
Laws of Motion
270172
A force of \(150 \mathrm{~N}\) produces an acceleration of \(2 \mathrm{~ms}^{-2}\) in a body and a force of \(200 \mathrm{~N}\) produces an acceleration of \(3 \mathrm{~ms}^{-2}\). The mass of the body and the coefficient of kinetic friction are
1 \(50 \mathrm{~kg} ; 0.1\)
2 \(25 \mathrm{~kg} ; 0.1\)
3 \(50 \mathrm{~kg} ; 0.5\)
4 \(50 \mathrm{~kg} ; 0.2\)
Explanation:
\(F-f=m a, f=\mu_{k} m g\)
Laws of Motion
270173
A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25 , the maximum percentage of the length of the chain that can hang over one edge of the table is
270214
The coefficient of friction between a car wheels and a roadway is 0.5 The least distance in which the car can accelerate from rest to a speed of\(72 \mathrm{kmph}\) is \(\left(\mathrm{g}=10 \mathrm{~ms}^{-2}\right)\)
270171
A block of mass \(20 \mathrm{~kg}\) is pushed with a horizontal force of \(90 \mathrm{~N}\). If the coefficient of static and kinetic friction are 0.4 and 0.3 , the frictional force acting on the block is \(\left(g=10 \mathrm{~ms}^{-2}\right)\)
1 \(90 \mathrm{~N}\)
2 \(80 \mathrm{~N}\)
3 \(60 \mathrm{~N}\)
4 \(30 \mathrm{~N}\)
Explanation:
\(f_{k}=\mu_{k} N, N=m g \quad\)
Laws of Motion
270172
A force of \(150 \mathrm{~N}\) produces an acceleration of \(2 \mathrm{~ms}^{-2}\) in a body and a force of \(200 \mathrm{~N}\) produces an acceleration of \(3 \mathrm{~ms}^{-2}\). The mass of the body and the coefficient of kinetic friction are
1 \(50 \mathrm{~kg} ; 0.1\)
2 \(25 \mathrm{~kg} ; 0.1\)
3 \(50 \mathrm{~kg} ; 0.5\)
4 \(50 \mathrm{~kg} ; 0.2\)
Explanation:
\(F-f=m a, f=\mu_{k} m g\)
Laws of Motion
270173
A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25 , the maximum percentage of the length of the chain that can hang over one edge of the table is
270214
The coefficient of friction between a car wheels and a roadway is 0.5 The least distance in which the car can accelerate from rest to a speed of\(72 \mathrm{kmph}\) is \(\left(\mathrm{g}=10 \mathrm{~ms}^{-2}\right)\)
270171
A block of mass \(20 \mathrm{~kg}\) is pushed with a horizontal force of \(90 \mathrm{~N}\). If the coefficient of static and kinetic friction are 0.4 and 0.3 , the frictional force acting on the block is \(\left(g=10 \mathrm{~ms}^{-2}\right)\)
1 \(90 \mathrm{~N}\)
2 \(80 \mathrm{~N}\)
3 \(60 \mathrm{~N}\)
4 \(30 \mathrm{~N}\)
Explanation:
\(f_{k}=\mu_{k} N, N=m g \quad\)
Laws of Motion
270172
A force of \(150 \mathrm{~N}\) produces an acceleration of \(2 \mathrm{~ms}^{-2}\) in a body and a force of \(200 \mathrm{~N}\) produces an acceleration of \(3 \mathrm{~ms}^{-2}\). The mass of the body and the coefficient of kinetic friction are
1 \(50 \mathrm{~kg} ; 0.1\)
2 \(25 \mathrm{~kg} ; 0.1\)
3 \(50 \mathrm{~kg} ; 0.5\)
4 \(50 \mathrm{~kg} ; 0.2\)
Explanation:
\(F-f=m a, f=\mu_{k} m g\)
Laws of Motion
270173
A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25 , the maximum percentage of the length of the chain that can hang over one edge of the table is
270214
The coefficient of friction between a car wheels and a roadway is 0.5 The least distance in which the car can accelerate from rest to a speed of\(72 \mathrm{kmph}\) is \(\left(\mathrm{g}=10 \mathrm{~ms}^{-2}\right)\)
