69 Answered Questions for the topic Work

Work & force

I am a weight lifter and want to calculate how much "work" I do when performing the deadlift. I did the math and want to ensure my concepts and calculations are correct, as it has been a while... more

11/13/15

two mass connected by string on a slide... about the work and energy things

There a mass of 4kg and a mass of 5kg connected by an inextensible string passing over a smooth pulley .the mass for 4kg starts from rest and moves up the smooth plane inclined at 30degree to... more

10/30/15

A particle with total energy E in Potential energy region U(x).Motion of the particle is restricted to the region when ? check description

A particle with total energy E in Potential energy region U(x).Motion of the particle is restricted to the region when  options are (a) U(x)>E (b) U(x)<E (c) U(x)=0 (d) U(x) < or = E

10/30/15

Car have mass m,its engine delivers power P.what's the minimum time in which car can be accelerated from rest to speed v

A car of mass m has an engine which can deliver power P.The minimum time in which car can be accelerated from rest to a speed v is(a) (mv^2)/2P(b) Pmv^2(c) 2Pmv^2(d) (mv^2)P/2
Work Power Energy

10/30/15

Find mechanical power?

The blades of a wind mill sweep out a circle of area A.If wind flows with velocity v perpendicular to blades of wind mill and its density is D,then the mechanical power received by wind mill is (a)... more
Work Power Energy

10/30/15

Find Power ?

A pump is used to pump a liquid of density D continuously through a pipe of cross section area A.If liquid is flowing with speed v,then power of pump is(a) (DAv^2)/3(b) (DAv^2)/2(c) 2DAv^2(d)... more
Work

10/22/15

How much work does the girl have to do to bring herself to a stop?

A young girl (m = 30 kg) rides a skateboard (m = 3.2 kg) at a speed of 4.2 m/s. (a) How much work does the girl have to do to bring herself to a stop? (b) How far does she travel if it takes 6.0 s... more
Work

10/06/15

what happened to other dollar

bob wanted to buy a sweater which cost $97.00.  Mom gave him $50.00 and dad gave him $50.00.  He bought the sweater and received $3.00 change.  He gave dad $1.00 and mom $1.00 and kept $1.00 for... more

08/22/15

work due to gravity

The force pulling an object to earth is  where G is the gravitational constant, M is the mass of the Earth, m is the mass of the object, and r is the distance between the object and the center of... more

08/22/15

. A spaceship weighs 50 tons on the launch pad. As it ascends, it burns fuel so that it weighs 20 tons by the time it reaches an altitude of 70 miles.

How much work is done in lifting the spaceship to an altitude of 70 miles? a. 2450 mi-tons b. 2100 mi-tons c. 3500 mi-tons d. none of these

08/18/15

If an object is displaced a distance d by a constant force F, the amount of work done is given by _____.

a. W=F+d   b. W=F-d   c. W=Fd   d. W=F/d  
Work

04/09/15

The co worker along with manager has started lobbying against you and has planned to forward a case of impeachment to get you get sacked or get posted to a diff

you are working in an event management department, a coworker having the same job scale has been asked to work with you, the coworker is rude and biased but she has good terms with the manager of... more
Work Physics

04/05/15

Work done on system

Suppose a gas of 2D atoms is trapped inside a square of area A.What is the expression for the work done on the system as the area of the square changes?
Work Powers Force

10/15/14

Work required and power being used.

Find the work required to lift a mass of 5 tonnes to a height of 30m.  If this is done in 2 minutes, what power is being used?

08/06/14

Physics Work and Energy Question!

A boy pulls a 10.0 kg book rack at rest on a smooth floor with a constant horizontal force of 1.2N starting from rest. Compute the change in kinetic energy of the box after the boy has pulled it a... more
Work Calculus

07/12/14

A caluclus work problem.

A cylindrical tank of radius 4 ft and length 12 ft is lying on its side on horizontal ground. The tank initially is full of gasoline weighing 40 lb/ft3. How much work is done in pumping all this... more

06/07/14

Helpppppp please

Which is a function?A. (2,9),(-1,1),(-1,-2),(1,-1)B. (2,9),(9,-1),(2,1)C. (2,9),(9,2),(1,1)D. {2,9,-1,1}

06/07/14

find f(-3) given F(x)=3x^2+x-7

Hello. I NEED HELP WITH THIS EQUATION MY OWN TUTOR GAVE ME TO SOLVE. ASAP :)

Calculus and Vectors!

A ramp is inclined at 12 degrees to the horizontal. A cart is pulled 8m up the ramp by a force of 120N, at an angle of 10 degrees to the surface of the ramp. Determine the mechanical work done... more

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