Classical Mechanics Answers

A ball rolls down a hill with constant acceleration. After 2.0 seconds the ball has travelled 1.2 m, how far will it have travelled after 4.0 seconds?

A christmas present ( modelled as a particle) 0.5 kg is released from rest on the surface of
water in a well. It takes 2 seconds to reach the bottom of the well. Find depth well

A length of 19mm is divided into 20 equal parts to form a venier scale. If this venier is used with a main scale marked in mm, the smallest distance that can be measured using this combination is?
A. 0.5mm
B. 0.1mm
C. 0.05mm
D. 0.001mm

In the case of a micrometer screw guage, the pitch of the screw is 0.5 mm. If there are 50 divisions on the head scale, the smallest distance that can be measured using this instrument is?
A. 0.5mm
B. 0.1mm
C. 0.005mm
D. 0.01mm

A ball is projected vertically up from ground.Boy 'A' Standing at the window of first floor of a nearby building observes that the time interval between the ball crossing him while going up and the ball crossing him while going down is 2 s. Another boy 'B' standing on the second floor notices that time interval between the ball passing him twice during up motion and down motion is 1 s.Calculate the difference between the vertical positions of boy B and boy A.
(Assume g=10m/s^(2))
Ans: 3.75m

The coefficient of static and kinetic friction between a 3.0 kg box and a table are 0.40 and 0.30 respectively. What is the net force on the box when a 10.0 N horizontal force is applied to the box when at rest on a table?

Two wooden pucks approach each other on an ice rink as shown in the figure. Puck #2 has an initial speed of 4.64 m/s and a mass that is some fraction f = 2/3 that of puck #1. Puck #1 is made of a hard wood and puck #2 is made of a very soft wood. As a result, when they collide, puck #1 makes a dent in puck #2 and 12.8% of the initial kinetic energy of the two pucks is lost. Before the collision, the two pucks approach each other in such a manner their momentums are of equal magnitude and opposite directions. Determine the speed of the two pucks after the collision, V1 and V2.

A water molecule consists of an oxygen atom with two hydrogen atoms bound to it. The angle between the two bonds is 106°. If the bonds are 0.1nm long where is the centre of mass of the molecule?

When a small sphere moves at a low speed through a fluid, the viscous force F opposing the motion is found experimentally to depend on the radius r, velocity v, and the coefficient of viscosity n of the fluid. Find the force dimension of the force F

A box of books weighing 304 N moves with
a constant velocity across the floor when it is
pushed with a force of 373 N exerted downward at an angle of 39.4◦ below the horizontal.
Find µk between the box and the floor.