Question

In: Mechanical Engineering

A cast iron saucepan of mass 4.4 kg is filled with 20 L of water at...

A cast iron saucepan of mass 4.4 kg is filled with 20 L of water at 25 °C, placed on an electric hotplate, and initially brought up to boiling point. Further heat is applied until half of the water has boiled off. What is the cost of the energy used if electricity costs 30 cents per kWh and the hotplate has an efficiency of 75%?

Solutions

Expert Solution


Related Solutions

A cast iron water pipe of 500 mm inside diameter and 20 mm thick, is supported...
A cast iron water pipe of 500 mm inside diameter and 20 mm thick, is supported over a span of 10 meters. Find the maximum bending stress in the pipe metal, when the pipe is running full. Take density of cast iron = 70.6 kN/m3 and water = 9.8 kN/m3
An iron boiler of mass 180 kg contains 730 kg of water at 11 ∘C. A...
An iron boiler of mass 180 kg contains 730 kg of water at 11 ∘C. A heater supplies energy at the rate of 58,000 kJ/h. The specific heat of iron is 450 J/kg⋅C∘, the specific heat of water is 4186 J/kg⋅C∘, the heat of vaporization of water is 2260 kJ/kg⋅C∘. Assume that before the water reaches the boiling point, all the heat energy goes into raising the temperature of the iron or the steam, and none goes to the vaporization...
a bucket of water with total mass 20 kg is attached to. a rope, which in...
a bucket of water with total mass 20 kg is attached to. a rope, which in turn wound around a 0.050 m radius cylinder at the top of a well. the bucket is raised to the top of the well and released. the bucket is moving with a speed of 8.0 m/s upon hitting the water surface in the well. calculat the following: a. the torque produced by the falling bucket b. the angular acceleration of the cylinder, if its...
Water flows through a cast iron pipe with a diameter of 30 mm. The pipe is...
Water flows through a cast iron pipe with a diameter of 30 mm. The pipe is inclined at an angle of 3 degrees from horizontal and is 40 m long. The water flows due to gravity only. What is the maximum volume flow rate of the water? You may ignore any minor loses.
Consider the case of the Cast Iron Company. On each nondelinquent sale, Cast Iron receives revenues...
Consider the case of the Cast Iron Company. On each nondelinquent sale, Cast Iron receives revenues with a present value of $1,320 and incurs costs with a present value of $1,000. Cast Iron’s costs have increased from $1,000 to $1,170. Assuming that there is no possibility of repeat orders and that the probability of successful collection from the customer is p = 0.85, answer the following. a-1. What is the expected profit of granting credit? (Do not round intermediate calculations.)...
A mass m1 = 4.4 kg rests on a frictionless table and connected by a massless...
A mass m1 = 4.4 kg rests on a frictionless table and connected by a massless string over a massless pulley to another mass m2 = 3.8 kg which hangs freely from the string. When released, the hanging mass falls a distance d = 0.7 m. 1)How much work is done by gravity on the two block system? 2)How much work is done by the normal force on m1? 3)What is the final speed of the two blocks? 4)How much...
A container is filled to the brim with 1.5 L of mercury at 20
A container is filled to the brim with 1.5 L of mercury at 20
A tank contains 20 kg of salt dissolve in 7000 L of water. Brine that contain...
A tank contains 20 kg of salt dissolve in 7000 L of water. Brine that contain 0.041 kg of salt per liter of water enters the tank at a rate of 25 L/min. The solution is kept thoroughly mixed and drains from the tank at the same rate. How much Kg salt remains in the tank if as time approaches to infinite?
the mass of block A is 80 kg, the mass of block b is 20 kg,...
the mass of block A is 80 kg, the mass of block b is 20 kg, and A is connected to B with the cable and pulley system shown. the pulleys rotate freely, and the cable and pulleys have negligible mass. the coefficient of static fricion between A and the horizontal surface is Ms=0.4, and the coefficient of kinetic friction is Mk=0.3. a) initially, block A is being held stationary and the system is at rest in static equilibrium ....
The flowrate for water traveling through a horizontal 300 m-long cast iron pipe with a diameter...
The flowrate for water traveling through a horizontal 300 m-long cast iron pipe with a diameter of 0.6 m and a pressure drop of 17.2 kPa is to be found. P.S. use iterative approach to find values of f and then V using that f.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT