Work Power Energy(L-2)

A wedge of mass M=4m lies on a frictionless plane. A particle of mass m approaches the wedge with speed v. There is no friction between the particle and the plane or between the particle and the wedge. The maximum height climbed by the particle on the wedge is given by:

JEE Main 2019 (09 Apr Shift 2)

A person pushes a box on a rough horizontal platform surface. He applies a force of 200 N over a distance of 15 m. Thereafter, he gets progressively tired and his applied force reduces linearly with distance to 100 N. The total distance through which the box has been moved is 30 m. What is the work done by the person during the total movement of the box?

JEE Main 2020 (04 Sep Shift 2)

• 3280 j

• 2780 j

• 5690 j

• 5250 j

Hydrogen ion and singly ionized helium atom are accelerated, from rest, through the same potential difference. The ratio of final speeds of hydrogen and helium ions is close to:

JEE Main 2020 (03 Sep Shift 2)

• 1 : 2

• 10 : 7

• 2 : 1

• 5 : 7

A cricket ball of mass 0.15 kg is thrown vertically up by a bowling machine so that it rises to a maximum height of 20 m after leaving the machine. If the part pushing the ball applies a constant force F on the ball and moves horizontally a distance of 0.2 m while launching the ball, the value of F(in N) is (g=10 m s^-2)

JEE Main 2020 (03 Sep Shift 1)

In a reactor, 2 kg of ₉₂U²³⁵ fuel is fully used up in 30 days. The energy released fission is 200 MeV. Given that the Avogadro number, N=6.023×10²³ per kilo mole and 1 eV=1.6×10^-19 J. The power output of the reactor is close to:

JEE Main 2020 (02 Sep Shift 1)

• 35 MW

• 60 MW

• 125 MW

• 54 MW

• 2

• 1

A particle (m=1kg) slides down a frictionless track (AOC) starting from rest at a point A (height 2m). After reaching C, the particle continues to move freely in air as a projectile. When it reaching its highest point P (height 1m), the kinetic energy of the particle (in J) is: (Figure drawn is schematic and not to scale; take g=10m s^-2 ) ______________.

JEE Main 2020 (07 Jan Shift 1)

A wedge of mass M=4m lies on a frictionless plane. A particle of mass m approaches the wedge with speed v. There is no friction between the particle and the plane or between the particle and the wedge. The maximum height climbed by the particle on the wedge is given by:

JEE Main 2019 (09 Apr shift 2)

• nMgL