Laws of Motion — Physics STD 11 Science — Question

The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative: Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.

What will be the angle formed between the directions of velocity and acceleration of the particle at the highest point of the path?

Acceleration due to gravity decreases more rapidly _________ earth surface.

What is the cause and outcome in a rotational motion?

Write the dimension of modulus of elasticity?

Two persons of equal mass are standing at some distance from each other on a flat field of ice with ice skates tied to their feet. Arope is tied around the waist of one person. If the second person pulls the rope towards himself, what will be the effect of the speed of both the people?

Write copper, steel, glass and rubber in the order of increasing coefficient of elasticity.

A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56s to return after reflection at the Moon’s surface. How much is the radius of the lunar orbit around the Earth?

Calculate the power of an electric engine which can lift 20 tonne of coal per hour from a mine 180m deep.