Mass of the block = 2.0 kg
Value of gravity = 9.81 m/s^2
Distance upto which the mass is lifted = 15 meters
Time taken to lift the mass of the block = 6.0 seconds
Now we already know
Work Done = Mass * Gravity * Distance
= 2 * 9.81 * 15
= 294 Joules
Then
Power Output = Work Done/Time
= 294/6
= 49 Watts
So the power output of the electric motor is 49 watts.The correct option among all the options given in the question is option "4".
The correct option is this: PHYSICAL CHANGES: BREAKING THE STICKS AND BOILING THE WATER. CHEMICAL CHANGE: LIGHTNING THE FIRE.
In chemistry, a physical change refer to a change in which no new material is formed while a chemical change refers to a change in which a new material is formed. Boiling of water does not change water into another thing, even when the water changes to vapor, it will still turn to water again when it cools down, so boiling is a physical change, so also the breaking of sticks. Lightening a fire on the other hand is a chemical change because a new material is formed and the original material can not be recovered. Putting fire on the sticks will turn the sticks to ashes and the sticks can not be recovered from the ashes, so this is a chemical change.
Answer:
Explanation:
1 ) Average power supplied to an inductor is zero because the phase difference of potential and current is π / 2 .
So it is a wrong statement .
2 ) Step up transformer increases the voltage . At high voltage , lesser current is required to transport electrical energy . When current is reduced , the loss of energy due to heating effect is reduced .
3 ) voltage and current are in phase in resistance in ac .
3 ) RMS stands for Root Mean Square .
Heat required to decrease the temperature of body is given as

here given that



now by above equation


now in order to evaporate water the heat is given as




so 97 g of water will evaporate from the body
Answer:
If the boat is going 36 km/h, then it will take about 5.8 hours to travel a distance of 210 km/h.
Explanation:
To calculate time, you have to divide the distance by the speed.
In this case, we take 210 and divide it by 36. The answer you will get is 5.83...