Generally, friction is an external force that acts opposite to the direction of relative motion or to prevent slipping. We further identify different types of friction. Kinetic friction is a force by a surface parallel to the surface that opposes the motion of a sliding object and causes it to slow down.

Normal Force Frictional Force Air Resistance Force Tension Force Spring Force Confusion of Mass and Weight A few further comments should be added about the single force that is a source of much confusion to many students of physics - the force of gravity.

Q: A planet moving along an elliptical orbit is closest to the sun at a distance r 1 and farthest away at a distanced of r 2. If v 1 and v 2 are the linear velocities at these points respectively. Then the ratio v 1 /v 2 is (a) r 1 r 2 (b) ( r 1 r 2) 2 (c) r 2 r 1 (d) ( r 2 r 1) 2 Click to See Answer : Also Read :

Solution Step 1: Given data in the question. In the question, it is given that the radius of orbit in which an artificial satellite is moving is 42250 k m and it takes 24 hours to revolve around the earth. Radius of the circular path r = 42250 k m Time period of the satellite T = 24 h r Step 2: Concept and formula to be used.

An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth. A 3.07 kms −1 B 5 kms −1 C 4.5 kms −1 D 7 kms −1 Medium Solution Verified by Toppr Correct option is A) Distance covered by the satellite in 24 hours s=2πr =2×3.14×42250=265464.58 km

answer answered . An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth. sumannegi5855 is waiting for your help. Add your answer and earn points. Answer 1 person found it helpful himusani2008 Answer: 3.069 km/s Explanation:

The product of time and velocity gives the displacement of an object moving at a uniform speed. The velocity of time and graph of a velocity that changes uniformly is a straight line. We can use this graph to calculate the acceleration of the object.

Two trains, 250 metres and 150 metres long respectively, are running on parallel lines. If they are running in the same directions, the faster train crosses the slower train in 40 seconds. If they are moving in the opposite direction they pass each other in eight seconds. What is the speed of the slower train?

This is the wavelength of the lowest energy electrons. Using de Broglie formula we can find the corresponding energy of electrons. E = p 2 /2m = (h/λ) 2 /2m = 1.45 *10-17 J = 90.4 eV (b) The wavelength of the 300 eV electrons is λ = h/p = h/(2mE) ½ = 7*10-11 m. For first-order Bragg reflection we therefore have

An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities in elastic collisions. Suppose two similar trolleys are traveling toward each other with equal speed. They collide, bouncing off each other with no loss in speed.

Therefore, its kinetic energy becomes 4 times its original value, because it is proportional to the square of the velocity. Hence, kinetic energy = 25 × 4 = 100 J. (ii) If velocity is increased three times, then its kinetic energy becomes 9 times its original value, because it is proportional to the square of the velocity.

In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s 2 .