Sheela_98

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## 6

Answers#### Define power.

I was reading an article over internet and it had a question regarding the definition of power.

25/02/2013
## 1

Answers#### "A basketball of mass 600 g which was resting on a hoop falls to the ground 3.05 m below. (i) What is the maximum kinetic energy of the ball as it falls? (ii) On bouncing from the ground the ball loses 6 joules of energy. What happens to the energy lost by the ball? (iii)Calculate the height of the first bounce of the ball."

"Mates! i had a bet with my friend, he said that i could not answer that question, I know I couldn't but docsity can :p A basketball of mass 600 g which was resting on a hoop falls to the ground 3.05 m below.
(i) What is the maximum kinetic energy of the ball as it falls?
(ii) On bouncing from the ground the ball loses 6 joules of energy.
What happens to the energy lost by the ball?
(iii)Calculate the height of the first bounce of the ball."

25/02/2013
## 6

Answers#### "A pendulum bob was raised to a height of 20 cm and allowed to swing so that it collided with a block at rest on a bench, as shown. Calculate the velocity of the bob just before the collision."

"This question has given me nightmares, help needed! A pendulum bob was raised to a height of 20 cm and allowed to swing so that it collided with a block at rest on a bench, as shown.
Calculate the velocity of the bob just before the collision."

25/02/2013
## 6

Answers#### "In a pole-vaulting competition an athlete, whose centre of gravity is 1.1 m above the ground, sprints from rest and reaches a maximum velocity of 9.2 ms–1. What is the maximum height above the ground that the athlete can raise his centre of gravity?"

"I would be v.thankful to whoever who would give me answer for that, In a pole-vaulting competition an athlete, whose centre of gravity is 1.1 m above the ground, sprints from rest and reaches a maximum velocity of 9.2 ms–1.
What is the maximum height above the ground that the athlete can raise his centre of gravity?"

25/02/2013
## 1

Answers#### "An ice skater of mass 50 kg was moving with a speed of 6 m s−1 then she collides with another skater of mass 70 kg who was standing still. The two skaters then moved off together at a speed of 2.5 m s−1. Calculate the kinetic energy of each skater before the collision. (ii) Calculate the kinetic energy of the pair of skaters after the collision. (iii)Comment on the total kinetic energy values before and after the collision."

"We are having a combined discussion session and we are stucked at this question. An ice skater of mass 50 kg was moving with a speed of 6 m s−1 then she collides with another skater of mass 70 kg who was standing still. The two skaters then moved off together at a speed of 2.5 m s−1.
Calculate the kinetic energy of each skater before the collision.
(ii) Calculate the kinetic energy of the pair of skaters after the collision.
(iii)Comment on the total kinetic energy values before and after the collision."

25/02/2013
## 1

Answers#### "A train of mass 30000 kg can reached a top speed of 50 m s−1. As the train approached the next station the driver applied the brakes uniformly to bring the train to a stop. (i) Calculate the kinetic energy lost by the train in stopping. (ii) What happened to the kinetic energy lost by the train?"

"Yesterday I felt quite embarased when i was not able to answer that. A train of mass 30000 kg can reached a top speed of 50 m s−1.
As the train approached the next station the driver applied the brakes uniformly to bring the train to a stop.
(i) Calculate the kinetic energy lost by the train in stopping.
(ii) What happened to the kinetic energy lost by the train?"

25/02/2013
## 6

Answers#### A car of mass 800 kg is travelling at 10 m s-1. What is its kinetic energy?

I want to shut the mouth of my geek friend kindly tell that if car of mass 800 kg is travelling at 10 m s-1. What is its kinetic energy?

25/02/2013
## 1

Answers#### "A student holds a metal ball 2 m above the ground. The mass of the ball is 5 kg. Calculate the potential energy of the ball."

"knock! knock! anyone willing to help? A student holds a metal ball 2 m above the ground. The mass of the ball is 5 kg.
Calculate the potential energy of the ball."

25/02/2013
## 4

Answers#### Give one factor on which the potential energy of a body depends.

I really wish that someone could answer me one factor on which the potential energy of a body depends.

25/02/2013
## 6

Answers#### What is the difference between potential energy and kinetic energy?

Help me Mates! !! what is the difference between potential energy and kinetic energy?

25/02/2013