PLEASE help me with these questions as soon as possible i need to turn it in!!!! A 60 watt light bulb uses 60 joules of electrical energy every second. However, only 6 joules of electrical energy is converted into light energy each second. a. What is the efficiency of the light bulb? Give your answer as a percentage. b. What do you think happens to the “lost” energy? 19. The work output is 300 joules for a machine that is 50% efficient. What is the work input? 20. A machine is 75% efficient. If 200 joules of work are put into the machine, how much work output does it produce?
An automobile engine is 15 percent efficient. How many joules of input work are required to produce 15,000 joules of output work to move the car?
A power station burns 75 kilograms of coal per second. Each kg of coal contains 27 million joules of energy. a. What is the total power of this power station in watts? (watts=joules/second) b. The power station’s output is 800 million watts. How efficient is this power station?
A bar of pure gold is heated to 95.0 degrees Celsius. The specific heat capacity of gold is 1.29 X 10^2. The gold is placed into 500 mL of ethyl alcohol initially at a temperature of 25 Celsius. The final temperature of the mixture is 27.0 Celsius. What is the mass of the gold?
include at least 3 reasons why having electricity is so great and at least 3 reasons why living without electricity would be so difficult
Two equal forces act on two different objects, one of which has a mass ten times as large as the other. Will the more massive object have a larger acceleration, an equal acceleration, or a smaller acceleration than the less massive object? Explain.
covert the names below into formulas in an equation then balance the equation 1.)Aluminum bromide plus chlorine yields aluminum chlorine plus bromine 2.)sodium phosphate + calcium chloride yields calcium phosphate +sodium chloride
why does diving 30m below sea level affect our bodies more than being in a building 30m above sea level
A ball is thrown horizontally from the roof of a building 56m tall and lands 45m from the base. What was the ball's initial velocity?
A rock at the edge of a 200-m high cliff has more potential energy than an equal sized rock at the edge of a 600-m high cliff.
216 joules of energy is required to raise the temperature of aluminium from 15 degrees Celsius to 35 degrees Celsius. Calculate the mass of aluminium. Note : the specific heat capacity of aluminium is 9.2 X 10^2
