help@askiitians.com

1800-150-456-789

Thermal Physics> A block of mass 20 kg is moved with const...

question mark

A block of mass 20 kg is moved with constant velocity along an inclined plane of inclination 37° with help of a force of constant power 50 W. If the coefficient of kinetic friction between block and surface is 0.25, then what fraction of power is used against gravity?

Fatima , 6 Years ago

Grade 12th pass

2 Answers

Eshan

Last Activity: 6 Years ago

From equilibrium of forces along the incline,
$mgsin\theta+\mu mg cos\theta=F$
$\implies F=160N$
Power= $Fv$ =constant= $50W$
$\implies v=\dfrac{5}{16}m/s$
Power used against gravity= $\vec{F_g}.\vec{v}=-mgsin\theta v=37.5W$
Hence fraction of power used= $75%$ %

Gitanjali Rout

Last Activity: 6 Years ago

From equilibrium of forces along the incline,
mgsin\theta+\mu mg cos\theta=F
\implies F=160N
Power=Fv=constant=50W
\implies v=\dfrac{5}{16}m/s
Power used against gravity=\vec{F_g}.\vec{v}=-mgsin\theta v=37.5W
Hence fraction of power used=75%%

Provide a better Answer & Earn Cool Goodies

LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

Full Live Access

Study Material

Live Doubts Solving

Daily Class Assignments

Ask a Doubt

Get your questions answered by the expert for free

A container filled with a sample of an Idea gas at the pressure of 1.5atm. the gas is compressed isothermal ly to one fourth of its original volume. What is the new pressure of the gas?

thermal physics

0 Answer Available

Last Activity: 2 Years ago

how do we know the electric field due to an electric dipole of dipole moment P at distance r from the centre of dipole is fiven by .. where theta is angle between p amd r vector..

thermal physics

0 Answer Available

Last Activity: 2 Years ago

A A mole of helium gas initially at stp undergoes an isovolumetric process in which its pressure falls to half its initial value. The work done by gas is

thermal physics

0 Answer Available

Last Activity: 3 Years ago

5000 J of heat are added to two moles of an ideal monatomic gas, initially at a temperature of 500 K, while the gas performs 7500 J of work. What is the final temperature of the gas? step by step please

thermal physics

1 Answer Available

Last Activity: 3 Years ago

Please help me with the answer of this question related to radiation graph

thermal physics

0 Answer Available

Last Activity: 3 Years ago

View all Questions