# Physics

Three designs are proposed for an engine that is to operate between 500 and 300 K. Design A is claimed to produce 750 J of work per kilojoule of heat input, B is claimed to produce 500 J, and C is claimed to produce 250J. Which design would you choose?

1. 👍
2. 👎
3. 👁
1. efficiency=(500-300)/300=.67
work output= 1000*eff=670 J
so the first design A is baloney
so go with design B would be my choice.

1. 👍
2. 👎
👤
bobpursley
2. what formula did u use?

1. 👍
2. 👎

## Similar Questions

1. ### physics

You're in an airplane that flies horizontally with speed 860 km/h (240 m/s ) when an engine falls off. Neglecting air resistance, assume it takes 26 s for the engine to hit the ground. Hight of airplane is: H = 3.3 km horizontal

2. ### Sociology (Stats) Std. Dev

Given (μ) = 500, and σ = 100. What percentage of the SAT scores falls: A) Between 500 and 600? The percentage falls 1 σ above the (μ), 68.26% / 2 = 34.13% B) Between 400 and 600? The percentage falls 1 σ below and 1 σ above

3. ### Physics

A heat engine exhausts 3 000 J of heat while performing 1 500 J of useful work. What is the efficiency of the engine?

4. ### physics

an engine pumps of 100 kg of water through a height of 10m in 5 second. Given that the efficiency of engine is 60%. If g=10m/s^2 the power of engine is

1. ### physics

Suppose you start an antique car by exerting a force of 300 N on its crank for 0.250s. What angular momentum is given to the engine if the handle of the crank is 0.300 m from the pivot and the force is exerted to create maximum

2. ### science

Problem How could renewable energy sources be used to power a car? Devise a Plan 1. Consider what you learned about renewable energy sources. Use what you learned to design a car that operates entirely on renewable energy sources.

3. ### physics

A Carnot engine is operated between two heat reservoirs at temperatures 520 K and 300 K. (a) If the engine receives 6.45 kJ of heat energy from the reservoir at 520 K in each cycle, how many joules per cycle does it reject to the

4. ### math

Find the exact value of cos 300 degrees. thanks guys cos 300 = 1/2 = 0.500 how do you know? I am supposed to show my work. You ought to know the rule on 30-60-90 triangles. If the hyp is 2, the shorter side is 1, and the longer

1. ### Physics

A transistor radio operates by means of a 9.0 V battery that supplies it with a 40 mA current. (a) If the cost of the battery is \$0.50 and it lasts for 300 h, what is the cost per kWh to operate the radio in this manner? (b) The

2. ### Physical Science

The main difference between the internal combustion engine and the diesel engine is that the diesel engine A. does not have a crankshaft. B. does not utilize pistons. C. has no connecting rods. D. has no ignition system. pretty

3. ### Physics

A portable CD player requires 12 volts to operate. A transformer allows the device to be powered from a 120-volt outlet. If the primary has 500 turns, how many turns should the secondary have?

4. ### Physics

A heat engine has the three step cycle shown above. Starting from point A, 1 L (liter) of ideal gas expands in the isobaric (constant pressure) process A to B at P = 2 atm. B to C is isovolumetric process at V = 5 L, and C to A is