Mechanics | Relativity Answers

a medium can carry a longitudinal wave because it has the property of

2)A shell of mass 3kg is fired from a gun with a velocity of 200 m/s. Knowing that the gun is free to move and its mass of 1400 kg,calculate its recoil velocity after firing the shell.

on smooth inclind plane of inclination = 45 drgree a bodyb takes time 2s to reach the bottom .when plane is made rough (coffecient of friction =0.75) ,the same body will take time ?????????????????????????????????/

a man of mass 50kg is climbing on pole with acceleration of 2m/s square .if coffecient of friction between his hand and pole is 0.4 then the horizontal force with which man is pressing the pole is ??????????????g=10

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.38 x 104 rad/s to an angular speed of 5.05 x 104 rad/s. In the process, the bit turns through 1.53 x 104 rad. Assuming a constant angular acceleration, how long would it take the bit to reach its maximum speed of 7.28 x 104 rad/s, starting from rest?

A 8.75-g bullet is moving horizontally with a velocity of +351 m/s, where the sign + indicates that it is moving to the right (see part a of the drawing). The bullet is approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The bullet passes completely through the first block (an inelastic collision) and embeds itself in the second one, as indicated in part b. Note that both blocks are moving after the collision with the bullet. The mass of the first block is 1249 g, and its velocity is +0.731 m/s after the bullet passes through it. The mass of the second block is 1502 g. (a) What is the velocity of the second block after the bullet imbeds itself? (b) Find the ratio of the total kinetic energy after the collision to that before the collision.

Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 16.1 kg and an initial velocity of = 8.11 m/s, due east. Object B, however, has a mass of mB = 29.8 kg and an initial velocity of = 5.46 m/s, due north. Find the (a) magnitude and (b) direction of the total momentum of the two-object system after the collision.

a truck on a straight road start from rest accelerating at 2 m/s^2 until it reaches a speed of 20 m/s then the truck travels for 20 s at a constant speed until the brakes are applied stopping the truck in a uniform manner in an additional 5 s . how long is the truck in motion and what is the average velocity of the truck for the motion described ?

a particle starts from rest at xi=0 and moves for 10 seconds with an acceleration of 2 cm/s^2 for the next 20 seconds the acceleration of the particle is -1 cm/s^2 what is the position of the particle at the end of the motion

a motor boat covers the distance between two spots on the river in t1=8 hr and t2=12 hr downstream and upstream respectively.the time required for the boat to cover this distance in still water will be