he energy efficiency of electric vehicles is usually rated in terms of the​ kilowatt-hours (of​ energy) required to drive 100​ miles, or​ kWh/100 mi. An electric car is rated at 38 ​kWh/100 mi.   a. Is a vehicle rated 27 ​kWh/100 mi more or less efficient than this electric​ car? b. How much energy​ (in kilowatt-hours) is required to drive this electric car 260 miles? c. Assuming electricity costs ​$0.14​/kWh, how much does it cost to drive this electric car 350 ​miles?

Q: If a 3500 Watt oven is on for 4 hours, then how many kilowatt-hours (kWh) of energy are used? kWh…

A: Energy is defined as E=Pt Here E is energy, P is power and t is time.

Q: A machine gun fires 360 bullets per minute. Each bullet has a mass of 5 grams and travels at 600…

A: Given: A machine gun fires 360 bullets per minute. mass each bullet of 5 grams  v = 600 m/s   To…

Q: Mark and Sam bought a brand new blender to make their favorite slush this summer season. This 2.75…

A: Mark and Sam bought a brand new blender to make their favorite slush this summer season. This 2.75…

Q: ase answer number 4

A: Given:-  1200-watt microwave oven, if you make microwave popcorn in 5minutes price per kWh is 13.267…

Q: 7. A container factory use a 370 W motor to operate a conveyor belt that lifts containers from one…

A: Given Mass lifted m = 250 kg Displacement h = 3.6 m Time taken t= 45 s Power P = 370 W

Q: Estimate the rate at which energy flows from a gasoline pump to a motor vehicle during  a “ fill-up.…

A: Given: The HHV of 1 gallon of gasoline is 145,000 Btu It takes 5 minutes to fill up a 16-gallon…

Q: You place an ice cube in a microwave oven. If it requires 32,195 J to melt the ice cube and the oven…

A: The equation for the power delivered to the microwave oven. P = Q/t the power is directly…

Q: A 1,100 kg horse is walking at 3.0 m/s. How much energy does the horse have?

A: 1,100 kg horse is walking at 3.0 m/s. How much energy does the horse have?

Q: According to the World Energy Council, the average household in Mexico consumes about 1600 kWh of…

A: Dimension of solar panels=(1×1)  So area of solar panel=1 m^2 Annual solar energy potential of panel…

Q: I need help finding how many types of energy radiant treatment for cancer has and what they are

A: Energy can be defined as the ability to do work. The energy stored in a battery is able to turn on…

Q: A large hoist is lifting a 2000 kg automobile. There is a gauge on the hoist that displays its power…

A:

Q: A 4 watt robot motor is being fitted to a 3 kg robot. The motor runs for 10 seconds. How fast will…

A: Given: Power given to robot motor P = 4 watt Mass of the robot m = 3 kg. Time taken by robot to move…

Q: By converting the power of loudspeaker,3700 000 Watt into kilowatt, we get

A: Power is defined as the ratio of work done and the unit time. It is generally represented by the…

Q: A certain region currently has wind farms capable of generating 2,400 megawatts (2.4 gigawatts) of…

A:

Q: Determine the amount of electrical energy (in J) used by the following devices when operated for the…

A:

Q: energy costs

A:

Q: A new coal-burning power plant can generate 1:5 gigawatts (billion watts) of power. Burning 1…

A: Given data: Energy generate = 1.5 GW Need to determine the energy generate in one month.

Q: use 4. A 12.0-kg mass is dropped from a hot air balloon at a height of 345 m above the ground. Find…

A:

Q: An electric heater of 1000 W is used for two hours in a day? What is the cost of using it for a…

A:

Q: Calculate the energy used per day (kWh) of a car with an efficiency of 14 kilometers per liter and…

A:

Q: One kilowatt-hour (kWh) is the amount of work or energy generated when one kilowatt of power is…

A:

Q: Do devices with efficiencies of less than 100% violate the law of conservation of energy? Explain.…

A: Devices with efficiencies of less than 100% do not violate the law of conservation of energy. The…

Q: Your Lecturer in class made the following statement: "We do not buy electrons from Eskom but we buy…

A: Given  Power of hairdryer P=1200W=12001000kW=1.2kW Time it is run t=30 min=3060hr=0.5hr 1kWh cost…

Q: A radio-controlled car powered by an electric motor accelerates from rest to 0.600 m/s in 22.0 ms.…

A: Solution:   Given Values, Initial Velocity (u) =0 m/s (since, it starts from rest)Final Velocity (v)…

Q: 3) How much energy does a 100-W light bulb use in 8.0 hours?

A: we use the concept of                                       1000W = 1 unit…

Q: An ice cube is placed in a microwave oven. Suppose the over delivers 105 W of power to the ice cube…

A:

Q: A. Suppose you lift a 15 kg box by a height of 1.0 m. How much work do you do in lifting the box?…

A: (a) The work done in lifting the box is

Q: If a blow dryer uses 1.1 x 10³ J of energy, and it is in use for 15 minutes, what is its power? the…

A: Given, energy consumed E=1.1x103W

Q: The total energy of an object at rest 10 m above the ground on a building is 200 J. The object is…

A: Given , Total energy at 10m above the ground = 200 J Height ,h = 10m acceleration due to gravity, g…

Q: A dime has mass 2.268 grams. Calculate the number of years the rest energy of a dime could be used…

A: Given data The mass of the dime is given as m = 2.26 grams. The power of the lightbulb P = 75 W.…

Q: 12.. Buying electricity Here is an extract from our electricity bill, The coloured text has been…

A:

Q: Chichay uses the washing machine which consumes energy at 300 Watts at normal washing speed. How…

A: Given(s): Power of the machine, P=300 W=0.30 kW It runs for, t=80 min=8060h=43 h Cost of…

Q: 2. An electric drive features a 24 kWh battery pack and has a range of 170 km at a constant speed of…

A: We will answer the question by using expression relating power and energy. The details are as…

Q: What is the wattage of a light bulb that uses 35 J of energy in 7 s?

A: given,  Energy = 35 J  time = 7 s  Therefore, the wattage of the light bulb               =…

Q: Calculate the number of kilowatt-hours (kW-hrs) consumed in a week by an 850- Watt window air…

A: Given,Power of Air conditioner =850 Watt

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.