Question 1 :
If an agent does a work W in time t, then power is given by: _________.
Question 2 :
An electric heater is rated 1500 W. How much energy does it use in 10 hours?
Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2e2f59b460d7261f64c.png' />
In the above fig. A force of 5 N is acting on an object. The object is displaced through 2 m in the direction of the force. If the force acts on the object all through the displacement, then what is the work done?
Question 4 :
If an electric iron of 1200 W is used for 30 minutes everyday, find electric energy consumed in the month of April.
Question 5 :
The relation connecting the initial velocity $\left(u\right)$ and final velocity $\left(v\right)$ of an object moving with a uniform acceleration a, and the displacement, s is__________.
Question 6 :
The energy possessed by a body due to its change in position or shape is called the potential energy.
Question 7 :
Soni says that the acceleration in an object could be zero even when several forces are acting on it. State true or false.
Question 8 :
An object of mass, m is moving with a constant velocity, v How much work should be done on the object in order to bring the object to rest?
Question 10 :
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 $\frac{km}{h}$.
Question 11 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d2f2f59b460d7261f662.PNG' />
The above image shows, A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force shown in figure. Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Question 14 :
An object of mass m is moving with a constant velocity v. How much work should be done on the object in order to bring the object to rest?
Question 15 :
A rocket is moving up with a velocity $\upsilon$. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?