taylor

Eight 6.0-W Christmas tree lights are connected in series to each other and to a 220-V source.

What is the resistance of each bulb?

Express your answer to two significant figures and include the appropriate units.

A(n) 550-Ω and a(n) 2300-Ω resistor are connected in series with a 12-V battery.

What is the voltage across the 2300-Ω resistor?

Express your answer to two significant figures and include the appropriate units

part a 

Calculate the terminal voltage for a battery with an internal resistance of 0.600 Ω and an emf of 9.50 V when the battery is connected in series with a 77.0-Ω resistor.Express your answer to three significant figures and include the appropriate units.part bCalculate the terminal voltage for a battery with an internal resistance of 0.600 Ω and an emf of 9.50 V when the battery is connected in series with an 770-Ω resistor.Express your answer to three significant figures and include the appropriate units.

If the tension in the cord is 110 N , how long will it take a pulse to travel from one support to the other?

How far apart are the wave crests (compressions)?

What is its period on Mars, where the acceleration of gravity is about 0.37 that on Earth?

What is the effective spring constant for this motion?

How much energy is involved in this motion?

Determine the amplitude.Determine the frequency.

Determine the total energy.Determine the kinetic energy when x = 0.330 m.Determine the potential energy when x = 0.330 m .

A heat engine exhausts 8800 J of heat while performing 3500 J of useful work.

What is the efficiency of this engine?

If an ideal refrigerator keeps its contents at 2.5∘C when the house temperature is 22∘C, what is its COP?

Express your answer using two significant figures.

f an ideal refrigerator keeps its contents at 2.5∘C when the house temperature is 22∘C, what is its COP?

Express your answer using two significant figures.

ive posted other questions to if they are not answered answer them please i will award best answer and 5 star rating 

A certain power plant puts out 500 MW of electric power. 

Estimate the heat discharged per second, assuming that the plant has an efficiency of 42 % .

Express your answer to two significant figures and include the appropriate units.

What is the maximum efficiency of a heat engine whose operating temperatures are 690 ∘C and 340 ∘C?

Express your answer using two significant figures.

1.How much energy is required to bring a 1.2-L pot of water at 11 ∘C to 100∘C? The specific heat of water is 4186 J/kg⋅C∘.

Express your answer to two significant figures and include the appropriate units.

2.For how long could this amount of energy run a 60-W lightbulb?

Express your answer to two significant figures and include the appropriate units.

What is the specific heat of a substance if 130 kJ of heat is needed to raise 8.1 kg of the substance from 18.0 ∘C to 37.2 ∘C?

Express your answer using two significant figures.

What is the specific heat of a substance if 130 kJ of heat is needed to raise 8.1 kg of the substance from 18.0 ∘C to 37.2 ∘C?

Express your answer using two significant figures.

to what temperature will 7600 J of heat raise 3.0 kg of water that is initially at 19.0 ∘C? The specific heat of water is 4186 J/kg⋅C∘.

Express your answer using three significant figures.

A cube of ice is taken from the freezer at -8.5 ∘C and placed in a 85-g aluminum calorimeter filled with 330 g of water at room temperature of 20.0 ∘C. The final situation is observed to be all water at 16.0 ∘C. The specific heat of ice is 2100 J/kg⋅C∘, the specific heat of aluminum is 900 J/kg⋅C∘, the specific heat of water is is 4186 J/kg⋅C∘, the heat of fusion of water is 333 kJ/Kg.

What was the mass of the ice cube?

Express your answer to two significant figures and include the appropriate units.