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406 Points
one month ago
Hey student.

S.I unit of luminous intensity is candela (cd) and of temperature is Kelvin (k).

Nandini Sharma
25 Points
one month ago
A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance?

406 Points
one month ago
Hey student.

Distance between the Sun and Earth:

= Speed of light x Time taken by light to cover the distance.

Given that in the new unit, speed of light = 1 unit

Time taken, t = 8 min 20 s = 500 s

Therefore, Distance between Sun and Earth = 1 x 500 = 500 units

Nandini Sharma
25 Points
one month ago
What is the unit of coefficient of friction?

406 Points
one month ago
Hey student.

Friction coeffcient has no unit.

Nandini Sharma
25 Points
one month ago
What provides the centripetal force to a car taking a turn on a level road?

406 Points
one month ago
Hey student.

Centripetal force is provided by the force of friction between the tyres and the road.

Nandini Sharma
25 Points
one month ago
Why is it desired to hold a gun tight to one’s shoulder when it is being fired?

406 Points
one month ago
Hey student.

Since the gun recoils after firing so it must be held lightly against the shoulder because gun and the shoulder constitute one system of greater mass so the back kick will be less.

Nandini Sharma
25 Points
one month ago
Why does a swimmer push the water backwards?

406 Points
one month ago
Hey student.

A swimmer pushes the water backwards because due to reaction of water he is able to swim in the forward direction.

Nandini Sharma
25 Points
one month ago
Friction is a self adjusting force. Justify.

406 Points
one month ago
Hey student.

Friction is a self adjusting force as its value varies from zero to the maximum value to limiting friction.

Nandini Sharma
25 Points
one month ago
Which of the following is scalar quantity? Inertia, force and linear momentum.

406 Points
one month ago
Hey student.

Inertia and linear momentum is measured by mass of the body and is a vector quantity and mass is a scalar quantity.

Nandini Sharma
25 Points
one month ago
Action and reaction forces do not balance each other. Why?

406 Points
one month ago
Hey student.

Action and reaction do not balance each other because a force of action and reaction acts always on two different bodies.

Nandini Sharma
25 Points
one month ago
If force is acting on a moving body perpendicular to the direction of motion, then what will be its effect on the speed and direction of the body?

406 Points
one month ago
Hey student.

No change in speed, but there can be change in the direction of motion.