355441
If a ball collides with a wall at an angle of \(45^{\circ}\) and rebounds perpendicularly with its initial direction then find the impulse acting on the ball
1 \(-2 m v \cos 45^{\circ} \hat{i}\)
2 \(-m v \cos 45^{\circ} \hat{i}\)
3 \(2 m v \cos 45^{\circ} \hat{i}\)
4 \(m v \cos 45^{\circ} \hat{i}\)
Explanation:
\(\Delta P=P_{2}-P_{1}\) \(\Delta P_{2}=-2 m v \cos 45^{\circ} \hat{i}\)
PHXI06:WORK ENERGY AND POWER
355442
A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that
1 It moves in a straight line
2 Its kinetic energy is constant
3 Its velocity is constant
4 Its acceleration is constant
Explanation:
When a force of constant magnitude which is perpendicular to the velocity of particle acts on a particle, work done is zero and hence change in kinetic energy is zero.
PHXI06:WORK ENERGY AND POWER
355443
Assertion : Universe as a whole may be viewed as an isolated system. Reason : Total energy of an isolated systern is not constant.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
"The universe, when viewed as an isolated system, maintains a constant total energy. If one part of the universe loses energy, another part must gain an equal amount of energy." \(\Rightarrow\) Reason is false So correct option is (3)
PHXI06:WORK ENERGY AND POWER
355444
A bullet is fired from the gun. The gun recoils, the kinetic energy of the recoil shall be-
1 Less than the kinetic energy of the bullet
2 equal to the kinetic energy of the bullet
3 double that of the kinetic enery of the bullet
4 Greater than the kinetic energy of the bullet
Explanation:
The gun has more mass than bullet but momentums are equal in manguitude. So \(K . E_{G U N} < K . E_{\text {BULLET }}\)
PHXI06:WORK ENERGY AND POWER
355445
A man squatting on the ground gets straight up and stands. The force of reaction of ground on the man during the process is
1 Constant and greater than \(mg\) in magnitude
2 Constant and equal to \(mg\) in magnitude
3 At first greater than \(m\)g, and later becomes equal to \(mg\)
4 Variable but always greater than \(mg\)
Explanation:
When the man gets straight up and stands, reaction of ground on the \(m a n=m g\). However, when the man is squatting on the ground, reaction of ground is more than \(mg\), as the man is to exert some extra force on the ground to stand up.
355441
If a ball collides with a wall at an angle of \(45^{\circ}\) and rebounds perpendicularly with its initial direction then find the impulse acting on the ball
1 \(-2 m v \cos 45^{\circ} \hat{i}\)
2 \(-m v \cos 45^{\circ} \hat{i}\)
3 \(2 m v \cos 45^{\circ} \hat{i}\)
4 \(m v \cos 45^{\circ} \hat{i}\)
Explanation:
\(\Delta P=P_{2}-P_{1}\) \(\Delta P_{2}=-2 m v \cos 45^{\circ} \hat{i}\)
PHXI06:WORK ENERGY AND POWER
355442
A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that
1 It moves in a straight line
2 Its kinetic energy is constant
3 Its velocity is constant
4 Its acceleration is constant
Explanation:
When a force of constant magnitude which is perpendicular to the velocity of particle acts on a particle, work done is zero and hence change in kinetic energy is zero.
PHXI06:WORK ENERGY AND POWER
355443
Assertion : Universe as a whole may be viewed as an isolated system. Reason : Total energy of an isolated systern is not constant.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
"The universe, when viewed as an isolated system, maintains a constant total energy. If one part of the universe loses energy, another part must gain an equal amount of energy." \(\Rightarrow\) Reason is false So correct option is (3)
PHXI06:WORK ENERGY AND POWER
355444
A bullet is fired from the gun. The gun recoils, the kinetic energy of the recoil shall be-
1 Less than the kinetic energy of the bullet
2 equal to the kinetic energy of the bullet
3 double that of the kinetic enery of the bullet
4 Greater than the kinetic energy of the bullet
Explanation:
The gun has more mass than bullet but momentums are equal in manguitude. So \(K . E_{G U N} < K . E_{\text {BULLET }}\)
PHXI06:WORK ENERGY AND POWER
355445
A man squatting on the ground gets straight up and stands. The force of reaction of ground on the man during the process is
1 Constant and greater than \(mg\) in magnitude
2 Constant and equal to \(mg\) in magnitude
3 At first greater than \(m\)g, and later becomes equal to \(mg\)
4 Variable but always greater than \(mg\)
Explanation:
When the man gets straight up and stands, reaction of ground on the \(m a n=m g\). However, when the man is squatting on the ground, reaction of ground is more than \(mg\), as the man is to exert some extra force on the ground to stand up.
355441
If a ball collides with a wall at an angle of \(45^{\circ}\) and rebounds perpendicularly with its initial direction then find the impulse acting on the ball
1 \(-2 m v \cos 45^{\circ} \hat{i}\)
2 \(-m v \cos 45^{\circ} \hat{i}\)
3 \(2 m v \cos 45^{\circ} \hat{i}\)
4 \(m v \cos 45^{\circ} \hat{i}\)
Explanation:
\(\Delta P=P_{2}-P_{1}\) \(\Delta P_{2}=-2 m v \cos 45^{\circ} \hat{i}\)
PHXI06:WORK ENERGY AND POWER
355442
A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that
1 It moves in a straight line
2 Its kinetic energy is constant
3 Its velocity is constant
4 Its acceleration is constant
Explanation:
When a force of constant magnitude which is perpendicular to the velocity of particle acts on a particle, work done is zero and hence change in kinetic energy is zero.
PHXI06:WORK ENERGY AND POWER
355443
Assertion : Universe as a whole may be viewed as an isolated system. Reason : Total energy of an isolated systern is not constant.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
"The universe, when viewed as an isolated system, maintains a constant total energy. If one part of the universe loses energy, another part must gain an equal amount of energy." \(\Rightarrow\) Reason is false So correct option is (3)
PHXI06:WORK ENERGY AND POWER
355444
A bullet is fired from the gun. The gun recoils, the kinetic energy of the recoil shall be-
1 Less than the kinetic energy of the bullet
2 equal to the kinetic energy of the bullet
3 double that of the kinetic enery of the bullet
4 Greater than the kinetic energy of the bullet
Explanation:
The gun has more mass than bullet but momentums are equal in manguitude. So \(K . E_{G U N} < K . E_{\text {BULLET }}\)
PHXI06:WORK ENERGY AND POWER
355445
A man squatting on the ground gets straight up and stands. The force of reaction of ground on the man during the process is
1 Constant and greater than \(mg\) in magnitude
2 Constant and equal to \(mg\) in magnitude
3 At first greater than \(m\)g, and later becomes equal to \(mg\)
4 Variable but always greater than \(mg\)
Explanation:
When the man gets straight up and stands, reaction of ground on the \(m a n=m g\). However, when the man is squatting on the ground, reaction of ground is more than \(mg\), as the man is to exert some extra force on the ground to stand up.
355441
If a ball collides with a wall at an angle of \(45^{\circ}\) and rebounds perpendicularly with its initial direction then find the impulse acting on the ball
1 \(-2 m v \cos 45^{\circ} \hat{i}\)
2 \(-m v \cos 45^{\circ} \hat{i}\)
3 \(2 m v \cos 45^{\circ} \hat{i}\)
4 \(m v \cos 45^{\circ} \hat{i}\)
Explanation:
\(\Delta P=P_{2}-P_{1}\) \(\Delta P_{2}=-2 m v \cos 45^{\circ} \hat{i}\)
PHXI06:WORK ENERGY AND POWER
355442
A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that
1 It moves in a straight line
2 Its kinetic energy is constant
3 Its velocity is constant
4 Its acceleration is constant
Explanation:
When a force of constant magnitude which is perpendicular to the velocity of particle acts on a particle, work done is zero and hence change in kinetic energy is zero.
PHXI06:WORK ENERGY AND POWER
355443
Assertion : Universe as a whole may be viewed as an isolated system. Reason : Total energy of an isolated systern is not constant.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
"The universe, when viewed as an isolated system, maintains a constant total energy. If one part of the universe loses energy, another part must gain an equal amount of energy." \(\Rightarrow\) Reason is false So correct option is (3)
PHXI06:WORK ENERGY AND POWER
355444
A bullet is fired from the gun. The gun recoils, the kinetic energy of the recoil shall be-
1 Less than the kinetic energy of the bullet
2 equal to the kinetic energy of the bullet
3 double that of the kinetic enery of the bullet
4 Greater than the kinetic energy of the bullet
Explanation:
The gun has more mass than bullet but momentums are equal in manguitude. So \(K . E_{G U N} < K . E_{\text {BULLET }}\)
PHXI06:WORK ENERGY AND POWER
355445
A man squatting on the ground gets straight up and stands. The force of reaction of ground on the man during the process is
1 Constant and greater than \(mg\) in magnitude
2 Constant and equal to \(mg\) in magnitude
3 At first greater than \(m\)g, and later becomes equal to \(mg\)
4 Variable but always greater than \(mg\)
Explanation:
When the man gets straight up and stands, reaction of ground on the \(m a n=m g\). However, when the man is squatting on the ground, reaction of ground is more than \(mg\), as the man is to exert some extra force on the ground to stand up.
355441
If a ball collides with a wall at an angle of \(45^{\circ}\) and rebounds perpendicularly with its initial direction then find the impulse acting on the ball
1 \(-2 m v \cos 45^{\circ} \hat{i}\)
2 \(-m v \cos 45^{\circ} \hat{i}\)
3 \(2 m v \cos 45^{\circ} \hat{i}\)
4 \(m v \cos 45^{\circ} \hat{i}\)
Explanation:
\(\Delta P=P_{2}-P_{1}\) \(\Delta P_{2}=-2 m v \cos 45^{\circ} \hat{i}\)
PHXI06:WORK ENERGY AND POWER
355442
A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that
1 It moves in a straight line
2 Its kinetic energy is constant
3 Its velocity is constant
4 Its acceleration is constant
Explanation:
When a force of constant magnitude which is perpendicular to the velocity of particle acts on a particle, work done is zero and hence change in kinetic energy is zero.
PHXI06:WORK ENERGY AND POWER
355443
Assertion : Universe as a whole may be viewed as an isolated system. Reason : Total energy of an isolated systern is not constant.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
"The universe, when viewed as an isolated system, maintains a constant total energy. If one part of the universe loses energy, another part must gain an equal amount of energy." \(\Rightarrow\) Reason is false So correct option is (3)
PHXI06:WORK ENERGY AND POWER
355444
A bullet is fired from the gun. The gun recoils, the kinetic energy of the recoil shall be-
1 Less than the kinetic energy of the bullet
2 equal to the kinetic energy of the bullet
3 double that of the kinetic enery of the bullet
4 Greater than the kinetic energy of the bullet
Explanation:
The gun has more mass than bullet but momentums are equal in manguitude. So \(K . E_{G U N} < K . E_{\text {BULLET }}\)
PHXI06:WORK ENERGY AND POWER
355445
A man squatting on the ground gets straight up and stands. The force of reaction of ground on the man during the process is
1 Constant and greater than \(mg\) in magnitude
2 Constant and equal to \(mg\) in magnitude
3 At first greater than \(m\)g, and later becomes equal to \(mg\)
4 Variable but always greater than \(mg\)
Explanation:
When the man gets straight up and stands, reaction of ground on the \(m a n=m g\). However, when the man is squatting on the ground, reaction of ground is more than \(mg\), as the man is to exert some extra force on the ground to stand up.
