physics

When the brakes in a car are applied, the frictional force on the tyres is?

A. is a disadvantage because it is in the direction of the motion of the car B. is a disadvantage…

5 years ago

A car of mass 800kg attains a speed of 25m/s in 20 secs. The power developed in the engine is?

A. 1 . 25 x 10^4 W B. 2 . 50 x 10^4 W C. 1 . 25 x 10^6W…

5 years ago

Its total energy just before hitting the ground is?

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower…

5 years ago

A lead bullet of mass 0.05kg is fired with a velocity of 200ms¯¹ into a lead block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is

A. 50 J B. 100 J C. 150 J D. 200 J Correct Answer: Option A Explanation From principle of…

5 years ago

Particles of mass 10^-2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad-1. If the radius of the blade is 0.2m, the centripetal force is

A. 2 N B. 20 N C. 200 N D. 400 N Correct Answer: Option B - 20 N Explanation…

5 years ago

Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.

A. 1 : 4 B. 2 : 1 C. 2 : 3 D. 2 : 5 Correct Answer: Option C…

5 years ago

The inner diameter of a test tube can be measured accurately using a?

A. micrometer screw guage B. pair of dividers C. metre rule D. pair of vernier calipers Correct Answer: Option D…

5 years ago

A net force of 15N acts upon a body of mass 3kg for 5s, calculate the change in the speed of the body?

A. 25.0ms-1 B. 9.0ms-1 C. 2.5ms-1 D. 1.0ms-1 Correct Answer: Option C C. 2.5ms-1 Explanation Ft = M(v - u)…

6 years ago

The duality of matter implies that matter?

A. exists as a particle of dual composition B. has momentum and energy C. has both wave and particle properties…

6 years ago

In a nuclear reactor, electricity can be generated through the following processes. Arrange the processes in the correct order.

i. The steam is used to drive turbines. ii. The heat energy released is removed by passing water through the…

6 years ago
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