Advertisements
Advertisements
प्रश्न
A uniform force of `(2hati + hatj)` N acts on a particle of mass 1 kg. The particle displaces from position `(3hatj + hatk)` m to `(5hati + 3hatj)` m. The work done by the force on the particle is ______
पर्याय
9 J
6 J
10 J
12 J
Advertisements
उत्तर
A uniform force of `(2hati + hatj)` N acts on a particle of mass 1 kg. The particle displaces from position `(3hatj + hatk)` m to `(5hati + 3hatj)` m. The work done by the force on the particle is 10 J.
APPEARS IN
संबंधित प्रश्न
What are the various non-commercial sources of energy?
How has the consumption pattern of energy changed over the years?
Discuss the reforms which have been initiated recently to meet the energy crisis in India.
A body of mass 4 m is lying in xy-plane at rest. It suddenly explodes into three pieces. Two pieces each of mass m move perpendicular to each other with equal speed v. The total kinetic energy generated due to explosion is ______
The potential energy of a system increases, if work is done ______
Define the following:
Law of conservation of energy
A bob of mass m is attached to one end of the rod of negligible mass and length r, the other end of which is pivoted freely at a fixed center O as shown in the figure. What initial speed must be given to the object to reach the top of the circle? (Hint: Use law of conservation of energy). Is this speed less or greater than the speed obtained in section 4.2.9?

Which of the following statements is true for commercial sources of energy?
Compact fluorescent lamp (CFL) consumes ______ percent less power than ordinary bulb?
What are the basic sources of generating power?
