Advertisements
Advertisements
Question
Is power a scalar or a vector quantity?
Solution
Power is a scalar quantity.
APPEARS IN
RELATED QUESTIONS
Power spent by a body depends on the time for which it does work.
The energy of a body is its capacity to do .........
Define the term energy.
Define 1 joule of energy.
When is work said to be done by a force?
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
When you move upstairs, do you perform some work?
Name the physical quantity associated with the 'rate of doing work'.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
Define Translational motion.
What should be the characteristic of a source of energy?
________ is said to be done when a force is acting on it.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car