Power + work - practice problems
Number of problems found: 32
- Seamstresses 83192
Three sewers sew 7 skirts in 15 hours. How many skirts can 2 seamstresses make in 50 hours? - Horizontal 82197
A cyclist rides along a horizontal path at a constant speed, overcoming a total resistance force of 20 N. What work does he do on a 5 km track? - Municipal 81852
Six workers repair 48 meters of municipal road in 2 days. How many days will 3 workers with the same output repair 60 meters of the road? - ELECTRICAL 81742
A cooker connected to a 40 V voltage source draws a current of 0.5 A. DOES THE SIZE OF THE ELECTRICAL WORK DETERMINE WHICH COOKER DOES IN 3 MINUTES?
- Electrical 80549
The factory hall is lit by 76 light bulbs, each of which has an input of 200W. Determine how much electrical work will be saved annually if the light is on an average of 100 minutes less per day. Consider 260 business days. - Work space
Every person in a conference room must have at least 36 square feet of workspace. A conference room is 28 by 20 ft. find the maximum number of people the room can accommodate. - Increasing 69094
The aircraft weighs 61 tons. It climbed from a height of 1000 m to a height of 3000 m while increasing the speed from 170 m/s to 210 m/s. What work did the aircraft engines do? - Calculate 67814
Two workers work in a workshop to produce the same product. The first worker worked 184 hours per month and produced 656 pieces of the product. The second worker worked 177 hours per month and produced 830 pieces of products. Calculate the hourly output o - Transfers 67414
At 80 cm above the road, a person transfers a stone weighing 2 kg parallel to it in a uniform motion along a path of 6 m in 10 s. With what power does it work?
- Performance 45861
The electric motor with a power input of 25 kW works with an efficiency of 80 percent. He will do the work in 6 hours. What is the performance, and what part of the work is the loss? - Ethanol 39281
How much power can we get if we pour ethanol on a mini turbine from a height of 1.5 m Volume Ethanol 0.2m³. How much work does ethanol do? The casting time is 1.9 minutes. The density of ethanol is 789 kg/m². - Two xeroxes
The performances of the two copiers are in the ratio of 3: 4. A machine with higher power will make 7,200 copies in one hour. How many copies will both machines make together in 5 hours? - Seamstresses 27211
Six seamstresses sew five suits in 3 days. How long before four seamstresses sew eight suits? - Motorcycle engine
The motorcycle engine has a constant power of 1.2 kW for 0.5 hours. How much work does the engine do? Express work in kWh and Ws units.
- Electric work
Calculate the work done by the electric forces passing the current of 0.2 A through the bulb in 10 minutes if the bulb is connected to a 230 V power supply. - Performance 20233
How many% need to increase performance, if the work we have planned for five days we have to manage in 3 days. - Worker's performance
Fifteen workers paint 180 m fence in 3 days. In how many days will nine workers paint a 360 m fence? We assume that each worker has the same, constant and unchangeable performance. - The mowers
The mowers were to mow two meadows, one twice as big as the other. They divided into two equal groups in the first half of the day. One continued to mow a larger meadow and cut it all by the end of the day. The second group mowed a smaller meadow but did - Four pavers
Four pavers would pave the square in 18 days. How many pavers do you need to add to the done work in 12 days?
Do you have homework that you need help solving? Ask a question, and we will try to solve it.