Question

Physics Test
FM - 20
[5]
[5]
of viscosity is [M'L-11-11
[3]
diameter is measured to be 35.72 of arc. Calculate the diameter of Jupiter.
coefficients have the proper units for r to be in metres.
(1) Find the v and a of the particle.
(it) What is the magnitude and direction of velocity of the particle at t = 3 sec.
5. Write the number of significant figures in 3.08 x 1011 and 0.060.
6. What are random errors? How it can be corrected?
[3]
[2]
[2]
1. The refractive index of water is found to have the values 1.29, 1.33, 1.34, 1.35, 1.32, 1.36, 1.30 and
1.33. Calculate the - (i) Mean value of refractive index, (ii) Mean absolute error, (iii) Relative error,
(iv) Percentage error, (4) Express the result in proper form.
2. Find an expression for viscous force Facting on a tiny steel ball of radius r moving in a viscous liquid
of viscosity n with a constant speed v by the method of dimensional analysis. Where the dimension
3. When the planet Jupiter is at a distance of 824.7 million kilometres from the earth, its angular
4. The position of a particle is given by r=51-3t i +7k, where, t is in seconds and the​

Answer 1

What is the amount of electrical energy consumed by the bulb.

Formula Used :-

Physics

10 points

\boxed{\bold{\small{Electrical\: energy\: =\: P\: \times t}}}

where,

Power

=

P

•

Time

=

t

•

Solution :-

Given :

Power = 100 W

•

Time = 30 d × 8 h = 240 h

•

According to the question by using the formula we get,

↦ Electrical energy = 100 × 240

↦ Electrical energy = 24000

We know that,

1 kWh = 1000 Watt-Hour

\dfrac{24000}{1000}

=

0

0

0

4

2

,

Then

\dfrac{\cancel{24000}}{\cancel{1000}}

↦ Electrical energy =

➠ Electrical energy = 24 Watt-Hour

energy

electrical

of

amount

The

\therefore

.

Watt-Hour

4

2

is

bulb

the

by

consumed