WEP

Question 1

Escape velocity of 10kg ball with relation to escape velocity of 5kg ball would be?

Answer 1

Escape velocity is not dependent of mass of the body.
Vesc = 11 km/s (OF earth)
same for both of them

Question 2

Work done by a force will be maximum when applied force is _____________ to displacement

Answer 2

Parallel
As work done = Fcosθ × d
shows the work done will be maximum when the angle is zero or 180o

Question 3

When gravitational field does negative work then P.E of body

Answer 3

When gravity does negative work, then height increases hence P.E increases

Question 4

If velocity is double, then what would happen to momentum and ke

Answer 4

Momentum increases 2 times and K.E increases 4 times
P = mv ⇒ P ∝ v
K.E = ½mv2 ⇒ K.E ∝ v2

Question 5

One megawatt hour is equal to.

Answer 5

36 × 108 J

Question 6

An object of mass 1g is whirled in a horizontal circle of radius 0.5m at a constant speed of 2m/s. The work done on the object during one revolution is:

Answer 6

0
As in circular motion displacement is zero. (closed path) conservative field

Question 7

The work energy expression is written as (in horizontal motion):

Answer 7

Work done = ΔK.E
By work energy principle Work done = ΔK⋅E + ΔP.E
In case of horizontal motion ΔP.E = 0

Question 8

A field is said to be conservative if:

Answer 8

i. The field in which work done on a body does not depend on the path followed by the body is called conservative field.
ii. The field in which work done in a closed path is zero is called conservative field.

Question 9

projectile is thrown in such a way that height equals range, the angle of projection is

Answer 9

tan-1(4)
76 degrees

Question 10

what does 1 🐴 power 🟰?

Answer 10

550 👣 lbs per second
746 watt