A small electric immersion heater is used to heat 71 g of water for a cup of instant coffee. The heater is labeled “63 watts" (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 19°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg•K.) th prob. Number i Units

Q: A 1 lbm/s fluid enters a machine at 170 m/s. 800 kPa, and with a specific volume of 0.3 m³/kg. The…

A: Determine workdone by the fluid?

Q: The heat exchanger radiates thermal energy at the rate of 2500 kJ/h for each square meter of its…

A:

Q: An electric heater supplies (R+2.5)kW of power in the from of heat to water. If in 5.5 hours, 350kg…

A: Given data- Power (P) = (R+2.5)kW=(83+2.5)kW=85.5kW Time (t) = 5.5 hours Mass of water (m) = 350kg…

Q: An engineer uses a solar-powered submersible pump to supply 20°C ground water to an above-ground…

A: d = 2cm = 0.02m = 20mm A = 3.1416 x 0.022/4 = 0.00031416m2

Q: 3. The motor unit A is used to elevate the 300-kg cylinder at a constant rate of 2 m/s. If the power…

A:

Q: A 70-mm-diameter suction pipe leading to a pump, as shown below, carries a discharge of 0.05 of oil…

A:

Q: HW. For the figure below fined the temperature of the nodels 1 to 9. 2 cm h, T_= 50°C 1. 4 1 cm >T=…

A:

Q: Water falls from a height of 500 m and the mass of water is 50 kg. What is approximately the rise in…

A:

Q: 7. What is the unit of power absorbed in a fluid? a) Ampere b) Volt/m c) kgm²s³ d) kg/m

A: Unit of power is a Watt. This is in accordance with the SI unit. The International system of units…

Q: Given data : Depth of flow=2 m Velocity of flow=3 m/s g=10 m/s2 Find specific energy

A:

Q: What is the equivalent value of T = 60° C in kelvins?

A: Kelvin: Kelvin is a unit of temperature in the SI unit system. It is a thermodynamic temperature…

Q: Water flows from a large reservoir at the rate of 1.20 ft/s through a pipe system as shown in Tigure…

A: To calculate the amount of energy loss (HL)-

Q: HW. For the figure below fined the temperature of the nodels 1 to 9. 2 cm h, T= 50°C 4 1 cm T= 300°C…

A: A Fourier transform system is a way of calculating points in a system area with the correct…

Q: Q2. A venturi meter of 15 cm inlet diameter and 10 cm throat is laid horizontally in a pip to…

A: Diameter of inlet (d1) = 15cm = 0.15 m Area of inlet (A1) = Π(d1)2/4 = Π*(0.15)2/4 = 0.01766 or…

Q: The wall shown in the figure consists of seven layers arranged in series. The thermal resistances of…

A: Thermal resistance is generally the ratio of the temperature difference between the material to the…

Q: A heat pump supplies heat energy to a house at the rate of 140,000 kJ/h when the house is maintained…

A: It is required to determine the maximum Coefficient Of Performance for air. We know that, 0oC = 273…

Q: A certain brand of hotdog cooker works by applying a potential difference of 146 V across opposite…

A: Given data; Potential difference, V=146 V Current, i=12.8 A H=60.8 KJ

Q: If the given system is released from rest in the position shown, calculate the velocity of hits the…

A:

Q: For the 11 cm diameter suction pipe leading to a pump in the figure, the pressure at point A in the…

A: Given data: Suction pipe diameter=11 cm =0.11 m Pressure at point A in the suction pipe is a vacuum…

Q: 13. In the treatment of 25 x 10³ m³/day of water, the amount of chlorine used is 15 kg/day. The…

A: Asked: To compute the chlorine demand.   Given: Flow rate = 25×103 m3/day Amount of chlorine used or…

Q: Calculate the amount of thermal energy required to raise the temperature of 20 gallon of water from…

A: The volume of water is 20 gallons.

Q: Assume 40% of the light emitted by a 1000 W metal halide lamp (110,000 lm) illuminates a surface…

A: Given Data: Utilisation factor, Uf = 40% =0.4 Luminous flux, ϕ= 110000 lm Diameter of illuminated…

Q: plot the relationship between the total energy line and hydraulic gradient line Vs distance from the…

A:

Q: 6.0 g of cream at 13.2 °C are added to an insulated cup containing 150.0 g of coffee at 92.9 °C.…

A:

Q: A turbine is rated at 700 hp when the flow of water through it is 0.72 m3/s. Assuming the efficiency…

A: Answer: We are given Power (P) =700 hp Flow rate(Q) = 0.72 m3/s Overall Efficiency(ηo) = 78%

Q: 2.5 liters of water at initial temperature of 16?C absorbed 800 calories of heat. Calculate the…

A:

Q: Calculate the power radiated by a woodstove of dimensions 65 cm high by 55 cm deep by 85 cm wide…

A: Data given: Dimensions: Height (H) = 65 cm Depth (D) = 55 cm Width (W)= 85 cm Surface temperature =…

Q: One of the most common appliances used on a daily basis is the hair dryer. A hair dryer is basically…

A: Given :

Q: A stove element draws 15 A when connected to a 240-V line. How long does it take to consume 60 kJ .

A: Given: The current is 15 A. The voltage line is 240 V. The energy is 60 kJ.

Q: A new temperature scale, the Asyphr scale(A), has been introduced, with the freezing point of water…

A: Given data- A new temperature scale, the Asyphr scale(A) According to the Asyphr scale- The freezing…

Q: NEWTON'S LAW OF COOLING 1. A cheesecake is taken out of the oven with an ideal internal temperature…

A:

Q: 7.) The conduction heat transfer rate through a wall is modeled by the following equation: Q = kAT L…

A: The expression for the heat transfer rate is given  by, Q=kAL∆T Here, Q is the heat transfer rate, k…

Q: The air inside a hot-air balloon is heated to 72.00 °C (Tinitial) and then cools to 52.00 °C…

A:

Q: calcujate the reading of o barometer în mm of mercury 97.9 kPa corres ponding to an atmospheric…

A:

Q: Calculate the amount of energy required in BTU to heat the air in a 10°F house 30 by 50 by 40 ft and…

A: Specific heat of air(Cp) =0.241 BTU/lb oF Density of air=0.0844lb/ft3

Q: Convert the temperature of scalding water, 54 °C, into degrees Fahrenheit and kelvin.

A: Given that Scalding water (t) = 54°cwe need to °c convert into Fahrenheit and Kelvin(i) oc to…

Q: The design fluid (typically water and antifreeze) flow rate through a solar hot-water heater system…

A: Given:- The design fluid (typically water and antifreeze) flow rate through a solar hot-water heater…

Q: A flocculation tank contains 1800 m³ of water, which is mixed using paddles at an average velocity…

A: Given data in question  Volume Velocity gradient Temperature  Dynamic viscosity To find out…

Q: The inside temperature of an oven is maintained at 230° C while the kitchen air temperature is 25° C…

A: The measure of hotness or coolness of a body is characterized as temperature. It is expressed in…

Q: Use Newton's law of cooling to determine the current temperature of a body in air temperature of…

A:

Q: Steel plates (AISI 1010) with a thickness of 6 mm and sides with a length L = 0.49 m, are…

A: Consider the given data Thickness of the plate=δ=6 mLength of the plate=L=0.49 mVelocity of…

Q: Oil (s.g.=.8) flows @ 25L/s, if the energy produced by the fluid is 10 determine the power produced…

A:

Q: A fan delivers 4m^3 of air per second at 20 degrees celsius and 1.2 bar. Assuming molecular weight…

A: Given: The volume of air is 4 m3. The temperature is 20oC. The pressure is 1.2 bar. The molecular…

Q: Calculate the energy loss

A: Given data : Depth on upstream (Y1)=0.58 mDepth on downstream (Y2)=2.688 m

Q: Typical heating values of natural gas from various parts of the U.S. are shown in the accompanying…

A: To find:- the average, variance, and standard deviation

Q: 4. The horizontal pump in the Figure discharges 13°C water at 26 m/h. Neglecting losses, what power…

A: Given that: Pressure at point 1, P1=100 kPaPressure at point 2, P2=300 kPaDiameter at section 1, d1…

Q: PROBLEM N0.3 A cup of tea at a temperature of 50°C is placed in a room at a constant temperature of…

A: Given:- The room temperature of a cup of tea = 50°C The constant temperature = -15°C The temperature…

Q: Calculate the heat loss from a double-pane glass window consisting of two pieces of glass, each…

A: Given:- Thickness of 10 mm thermal conductivity of k = 1.3 W/m.K . The two glass panes are separated…

Q: Replacing incandescent lights with energy-efficient fluorescent lights can reduce the lighting…

A: Given data:

Thermal Processes

Some of the key areas where thermal processes find their application are: