Two positive charges are brought closer together. Describe the work done and the energy conversion that occurs.

Two positive charges are brought closer together. Describe the work done and the energy conversion that occurs.

How much potential energy does 8 million kg of water have as it drops 50 m over Niagara Falls? If a 8 million kg of water flows over Niagara Falls each second, calculate the power available...

Mei picks forty bushels of apples in 6 hours, her friend helps and it only takes 3.75 hours. Find how long it would take Cody to do it alone.

Calculate the work done you need to do to raise a 9 kg box a vertical distance of 3 meters. Show all work. When the same box is raised the same vertical distance by pushing it up a 5m long...

A weightlifter lifts a 50 kg barbell 2.5 meters into the air. How much work does she do on a barbell? How much potential energy does the barbell have at the top? If she lifts the barbell...

How much power is expended to raise a 300 kg roller coaster car to the top of a 35 m hill in 10 seconds? How much potential energy does the roller coaster car have at the top of the hill? Show...

a peole moving conveyor belt moves a 600 newton person a distance of 100 meters through the airport. How much work was done? shoul I assume there is any friction from this Question , As is...

If you only have 9000 W of power of use, how fast can you raise the car to the top of the hill? It takes 7500 W of power to raise a roller coaster car to the top of a hill in 11 seconds...

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...

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 horizontal...

Which of the following is/are not true for a randomized clinical trial: a) Subjects are randomly assigned to treatment and control groups b) The comparison of outcome between treatment and control...

how many feet of cable are needed to connect the deck to the main cables between the two towers? show all your work? assume that we need to build a bridge that spans 2400 feet. The two towers,...

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)...

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...

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)...

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...

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...

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)...

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

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...