Explanation:
1) when skating because of friction , some of the kinetic energy is converted to thermal energy.
therefore Kinetic energy is reducing and thermal energy is increasing
2) when the brake pads are applied , the speed get decreased . this will cause the Kinetic energy to reduce. thermal energy is increased due to the friction occur when braking
3) when the boy stop , he no longer has a movement. now the whole amount of kinetic energy should be transfered to another form of energy. So the thermal arises
4) as we know energy can never be destroyed. it can only be transferred in to another form. here the kinetic and the thermal energy were the only types of energy that we could see.
therefore
Total Energy = kinetic energy + thermal energy
Answer:
im pretty sure about C
Explanation:
a switch acts a resistor that can be turned on and off
Also it's the same for Automotive purposes
The point beneath surface where rock breaks and an earthquake is produced is known as the Focus.
Answer:
Explanation:
Angular acceleration is defined as the variation of angular speed with respect to time:
The relation between the angular speed and the linear speed is given by:
Replacing (2) in (1):
We need to convert to :
Recall that:
Replacing:
First half distance is covered by speed 4 m/s
so the time taken by the jogger to complete the distance
next half distance is covered by speed 2 m/s
so the time taken by it to cover the distance
now the total time of the journey
now the average speed is given by
so its average speed will be 2.67 m/s