71 Answered Questions for the topic Work

02/19/18

Mechanics Question - Finding speed reduction time
A car of mass 1000 kg has its speed reduced from 81 km/h to 54 km/h by brakesproducing a force of 1250 N. How long does this take? Determine the work done bythe brakes on the car. Determine... more
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Work

02/09/18

A ball rolls down a ramp. The ball has a mass of 1 kg and it has 18 joules of kinetic energy. What is the ball's speed?
i need help for school 23323232323
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02/05/18

If a plane can travel 460 miles per hour with the wind and 040 miles per hour against the wind, find the speed of the plane in still air.
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01/23/18

Ted's class collects aluminum cans to sell to the recycling center. The center pays $0.002 for each kilogram of aluminum.
T=total amount they'll revive  N=number of kilograms of cans 
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01/18/18

Physics Power and Work
A 49kg bicycle rider delivers an average of 0.28 hp. The mass of the bicycle is 2.1kg and the hill she is climbing is 245m tall. How much time will this take?
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Work

11/01/17

You want to take your 1.7kg textbook down from a 2.0m shelf. It moves at a constant speed of 1.0 m/s. How much work is done?
I need this answered as soon as possible I am stuck and don't know how to calculate the force. So I cannot use the formula.
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Work

09/29/17

A line with a slope of - 7 passes through the points ( - 8,10) and ( - 6,k). What is the value of k?
need the answer
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09/25/17

Is .46 cents per call for a job good?
Is this a good pay rate for telemarketing?
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Work Physics Power

07/28/17

Machine Efficiency
A force of 455 N is exerted in pulling 15 m of rope using a pulley system to lift a 935 N object 5 m. What is the efficiency of the system?   ...What is the difference between Work in and Work... more
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07/27/17

Conservation of Energy
A 45 kg student runs with a speed of 2.0 m/s off a horizontal ledge that is 5.0 above a swimming pool. Calculate the vertical speed of the student when she hits the water.   ...   Energy before... more
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05/17/17

Help with Work
Is it "wrong" to not make myself available 24/7 at work. I put in for my new summer schedule which would've been every day in the morning for availability. Which is more far more time I would've... more
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04/12/17

A cattle trough has a trapezoidal cross section with a height of 100 cm and horizontal sides of width 100 cm and 50 cm.
A cattle trough has a trapezoidal cross section with a height of 100 cm and horizontalsides of width 100 cm and 50 cm. Assume the length of the trough is 1000 cm. Thedensity of water is = 1000... more
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Work

03/29/17

If one candy bag cost 0.71 cents at 1.50 ounces. How much does 1 ounce cost me?
I am just trying to see how much one ounce will cost me.
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Work

02/18/17

Paige only needs to sell to 17 more customers to receive a bonus. She works part time, so she only talks to 50 customers per day. With a sales ratio of 1:9, o
Paige only needs to sell to 17 more customers to receive a bonus. She works part time, so she only talks to 50 customers per day. With a sales ratio of 1:9, on which day will Paige qualify for a... more
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Work

02/03/17

one pan pizza and two beef burritos provide 1980 calories. two pan pizzas and one beef burrito provide 2670 calories. find the calories content of each item
one pan pizza and two beef burritos provide 1980 calories. two pan pizzas and one beef burrito provide 2670 calories. find the calories content of each item
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12/05/16

Work energy Power doubt
An object of mass m, initially at rest under the action of a constant force F attains a velocity v in time t. Then the average power is supplied to mass is ?
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11/27/16

Physics: Work, Kinetic Energy, and Energy Lost to Friction
A 1.00-kg block is pushed along a rough horizontal floor with a horizontal force of 5.00 N for a distance of 5.00 m. If the block is moving at a constant velocity of 4.00 m/s, find... The work... more
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10/20/16

Dynamics work and energy
why are there different formulas used for work-energy in dynamics?
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10/10/16

Temperature related doubts
if a refrigerator works between the temperature 4c &30c and 600 calories of heat is released then how to calculate work in joules ?
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Work Power Energy

08/07/16

What is the change in gravitational potential energy, in Joules?
A 20.0 kg box slides up a 12.0 m long incline at an angle of 30.0 degrees with the horizontal. A force of 150 N is applied to the box to pull it up the incline. The applied force makes an angle of... more
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05/25/16

I know that they repel but I don't get the work done and energy conversion
Two positive charges are brought closer together. Describe the work done and the energy conversion that occurs.
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Work

05/19/16

I pick forty bushels of apples in six hours. One day her friend Cody helped her and it only took 3.75 hours. Find how long it would take Cody to do it alone.
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.
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03/13/16

Physics Problems (2) : Work & Power
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... more
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03/13/16

Physics Problems (2) : Work & Power
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 at... more
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03/13/16

Physics Problems (2) : Work & Power
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 in 2... more
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