Advertisements
Advertisements
प्रश्न
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
उत्तर
Kilowatt is the unit of power and kWh is the unit of energy
APPEARS IN
संबंधित प्रश्न
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Name the forms of energy which a wound-up watch spring possesses.
Explain degradation of energy by taking two examples of your daily life.
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
Define Translational motion.
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
What should be the characteristic of a source of energy?
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.