Energy - practice problems

Direction: Solve each problem carefully and show your solution in each item.

Number of problems found: 166

Slices of ham
If 17 slices equal 70 calories, how many calories are in 5 slices?
Energy drink
You have 1/5 of an energy drink left. If you drink 1/5 of that, how much of your energy drink did you have left?
Gasoline price
At 34.4 cents per liter, how much will 42 liters of gasoline cost?
Decibel
A circuit has an input power of 92 mW. Its output power is 12 mW. What is the loss in decibels?
Determine 80705
The bulb is rated 6 V, 0.2 A. Determine the current rating of the bulb.
Efficiency 4072
What kind of work did the mixer with an efficiency of 30% do when it did 4.5 kWh of work?
Cubic
Convert 660 m³ of natural gas volume to energy units kWh. Combustion of 1 cubic meter of natural gas is released energy 10.55 kWh.
Workers 7767
Twelve workers would earn € 800 in 10 days. How many euros would 14 workers earn in 8 days?
Ounce
749 calories in a 7 - ounce serving. What is the unit rate?
Weighing 12481
A stone weighing 200g falls in a free fall for 3 s. Find its kinetic energy on impact.
Calories
A large order of McDonald's french fries has 500 calories. Of this total, 220 calories are from fat. Find the ratio of the calories from fat to total calories in a large order of McDonald's french fries.
Efficiency
What is the power output of a kettle 2 kW with an efficiency of 90%?
Kilometers 3029
The car consumed m liters of gasoline per s of kilometers. How many liters of gasoline does it consume per 100 km?
Bulb
A 60 W bulb consumes 0.12 kWh of electricity. How long did she stand light without a break?
MPG
252 miles a week fills up twice a week. Each fill is 38 gallons. What is the gas mileage of the car?
Transmission 44701
The electric field performs work 1610 J in the transmission of electric charge of 7 Coulombs between the heating coil terminals. Calculate the voltage between the terminals.
Average 41841
What work do we do if we pull out a 58mm nail with an average force of 350N?
Kinetic energy
A 100 kg car has a velocity of 15 m/s. what is the car's kinetic energy?
Calories 2
Ben eats approximately 2400 calories per day. His wife Sarah eats 5/8 as much. How many calories does Sarah eat per day?
The bulb
Calculate the voltage at the bulb's terminals; if the work 18 J is done to transfer particles with an electric charge of 6 C.

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