Mechanics | Relativity Answers

A train travels on a straight track passing a signal A at 20m/s. It accelerates uniformly at 2m/s and reaches signal B 100 m further than A. At B the velocity of the train in m/s is?

A lunar landing module is descending to the moon’s surface at a steady velocity of 10 m/s. At a height of 120 m, a small object falls from its landing gear. Taking the moon’s gravitational acceleration as 1.6 m/s^2 , at what speed, in m/s does the object strike the moon?

A ball is thrown vertically upwards. The quantity which stays constant is (a) displacement (b) speed (c) kinetic energy (d) acceleration (e) velocity. Explain reasons for your choice

A 7.5 kg mass has its velocity change from 10.5 m/s east to 4.2 m/s east. Find the object's change in momentum.

A force of magnitude 200 N is directed West, and a second force of magnitude 100 N is directed East of
North. Find the magnitude and direction of a third force that, when added to the first two forces, gives a
resultant whose magnitude is zero.

Calculate the distance of the closest approach for a head-on collision between an alpha particle having initial energy of 0.500 MeV and a gold nucleus at rest. Assume the gold nucleus remains at rest during the collision (b) What minimum initial speed must the alpha particle have to approach as close as 3.00 x 10-18m to the gold nucleus?

In the Rutherford scattering experiment, 400 MeV alpha particles scatter off gold nuclei (containing 79 protons and 118 neutrons). Assume a particular alpha particle moves directly toward the gold nucleus and scatters backward at 118 degrees, and that the gold nucleus remains fixed throughout the entire process. Determine (a) the distance of closest approach of the alpha particle to the gold nucleus and (b) the maximum force exerted on the alpha particle

An object is launched with an initial velocity of 10 meters per second from the ground level at an angle of 53° above the horizontal. What is the horizontal range of the object? (cos53°=0,6 sin 53°=0,8).
Take g=10 m/s2

In a nuclear collision, a proton A is incident on a stationary neighboring proton B with a velocity of 3.00 x 10 m/s. After impact, A moves in the direction BC inclined at 600 with a velocity of 1.50 x 102 m/s. B then moves in the direction BD declined at 0. If BC makes an angle 600with the initial direction (AB) of A and BD makes an angle G with it ;
ii) Verify whether or not the collision is elastic.