Home
Class 11
PHYSICS
Mass can be measured using a) Beam bal...

Mass can be measured using _____
a) Beam balance
b) Clock
c) Our hands
d) Water

Text Solution

Verified by Experts

The correct Answer is:
A, B
`d=3m`
`rarr r=1.5m`
`r=Distance form the centre to one of the kids
`n=20 rev per min`
`=20/60=1/3 rev/sec`
`omega=2pin=(2pi)/3rad/sec `
`:. FirctioN/Al force F=mromega^2`
`=15xx(15)xx((2pi)^2)/9`
`=5xx(0.5)x4pi^2=10pi^2`
`:. Friction force on one of the kids is `10pi^2`.
Promotional Banner

Similar Questions

Explore conceptually related problems

If a set of defective weights are used by a student to find the mass of an object using a physical balance, a large number of reading will reduce :-

The mass of a box measured by a grocer's balance is 2.30 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is (a) the total mass of the box, (b) the difference in the masses of the pieces to correct significant figures ?

The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17g are added to the box. What is (a) total mass of the box (b) the difference in masses of gold pieces to correct significant figures.

Answer briefly : (a) How do you perceive the colour of an object ? (b) Which part of our body helps us in maintaining the body balance ? (c) How does the eye regulate the amount of light that falls on the retina.

BOD of waste water is estimated by measuring the amount of (A) Total organic matter (B) Biodegradable organic matter (C) Oxygen evolution (D) Oxygen consumption

What can be the maximum distance of star which can be measured by using parallax method ?