A cube of water 14 cm on a side is placed in a microwave beam having...
A cube of water 14 cm on a side is placed in a microwave beam having E0 = 15 kV/m . The microwaves illuminate one face of the cube, and the water absorbs 77 % of the incident energy. How long will it take to raise the water temperature by 44 ∘C? Assume that the water has no heat loss during this time.
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A cube of water 14 cm on a side is placed in a microwave beam
having...
A cube of water 11 cm on a side is placed in a microwave beam having...
A cube of water 11 cm on a side is placed in a microwave beam having Eo = 14 kV/m. The microwaves illuminate one face of the cube, and the water absorbs 86 % of the incident energy Part A How long will it take to raise the water temperature by 50 °C? Assume that the water has no heat loss during this time. Express your answer to two significant figures and include the appropriate units. t= Value Units Submit...
Problem 4 You draw 10°C water from the tap and pop it into a cubic container...
Problem 4 You draw 10°C water from the tap and pop it into a cubic container to heat for tea. When the cube of 5.6 cm on a side is filled up to the brim you place it in a microwave beam having Eo = 15 kV/m. The water absorbs 75% of the incident energy. How long in seconds) should you microwave the water so it just reaches the boiling point? Make some plausible assumptions about the process to make...
a cube of wood 30 cm on a side and having a density of 0.65 g/cm^3...
a cube of wood 30 cm on a side and having a density of 0.65 g/cm^3 floats on water. A) what is the distance from the top of the cube to the water level? B) how much lead weight has to be placed on top of the cube so that its top is just level with the water?
Die gnt of 425 nm. 2. A typical microwave oven uses radiation of wavelength 12.2 cm...
Die gnt of 425 nm. 2. A typical microwave oven uses radiation of wavelength 12.2 cm a. How many moles of photons of this radiation are required to raise the temperature of 500.0 mL of water from 25°C to its boiling point? b. A watt (W) is a unit of power the rate at which energy is delivered or consumed (Power (W) = Energy (J)/time (s) or 1 W= 1 J/s. If all the energy of a 700-W microwave oven...
(10) 14. What is the mass of a gold cube (19.3g/cm^3) that is 23mm on a...
(10) 14. What is the mass of a gold cube (19.3g/cm^3) that is 23mm on a side? 15. What mass of gold (0.126 J/g degree C) requires 26984J of heat to raise the temperature 25.0 degree C?
Consider a 2-m-high electric hot-water heater that has a diameter of 40 cm and maintains the...
Consider a 2-m-high electric hot-water heater that has a diameter of 40 cm and maintains the hot water at 60 C. The tank is located in a small room at 20°C whose walls and ceiling are at about the same temperature. The tank is placed in a 44-cm-diameter sheet metal shell of negligible thickness, and the space between the tank and the shell is filled with foam insulation. The average temperature and emissivity of the outer surface of the shell...
1) Lake Erie contains roughly 4.00 ✕ 1011 m3 of water. (a) How much energy is...
1) Lake Erie contains roughly 4.00 ✕ 1011 m3 of water. (a) How much energy is required to raise the temperature of that volume of water from 17.2°C to 24.8°C? (Assume the density of this water to be equal to that of water at 20°C and 1 atm.)______ J (b) How many years would it take to supply this amount of energy by using the 1,400-MW exhaust energy of an electric power plant? _____ yr _________________________ 2) A 5.80-g lead...
A hot cup of black coffee (85°C) is placed on a tabletop (22°C) where it remains....
A hot cup of black coffee (85°C) is placed on a tabletop (22°C) where it remains. The surrounding room is at a temperature of 22°C. The cup is cylindrical in shape with a height of 15.0 cm and an outside diameter of 8.00 cm. The cup is made of ceramic with a thermal conductivity of 0.84 W/m°C. The outside of the cup has a temperature of 60°C and the cup is 6.0 mm in thickness. A slight breeze is blowing...
2) A person pours 400 g of water at 45°C into an 855-g aluminum container with...
2) A person pours 400 g of water at 45°C into an 855-g aluminum container with an initial temperature of 10°c. The specific heat of aluminum is 900 J/(kg-K) and that of water is 4190 J/(kg K). What is the final temperature of assuming no heat is exchanged with the surroundings? A) 3 B) 35°C D) 28°C E) 33°C 3) A heat engine with aneffic ency of 300% performs 300 of work. How much heat is discharged to the lower...
A right triangle has hypotenuse 13 cm and one side 7 cm. Find the length of...
A right triangle has hypotenuse 13 cm and one side 7 cm. Find the length of the other side, and the sine, cosine and tangent of each of the other two angles. A man running 4 m/s is passed by a car at 20 m/s, both heading East. What is the velocity of the man relative to the car? How far apart are the 20 seconds after the car passes the man? A ball is thrown vertically upwards from the...
A cube of water 11 cm on a side is placed in a microwave beam having Eo = 14 kV/m. The microwaves illuminate one face of the cube, and the water absorbs 86 % of the incident energy Part A How long will it take to raise the water temperature by 50 °C? Assume that the water has no heat loss during this time. Express your answer to two significant figures and include the appropriate units. t= Value Units Submit...
Problem 4 You draw 10°C water from the tap and pop it into a cubic container to heat for tea. When the cube of 5.6 cm on a side is filled up to the brim you place it in a microwave beam having Eo = 15 kV/m. The water absorbs 75% of the incident energy. How long in seconds) should you microwave the water so it just reaches the boiling point? Make some plausible assumptions about the process to make...
Die gnt of 425 nm. 2. A typical microwave oven uses radiation of wavelength 12.2 cm a. How many moles of photons of this radiation are required to raise the temperature of 500.0 mL of water from 25°C to its boiling point? b. A watt (W) is a unit of power the rate at which energy is delivered or consumed (Power (W) = Energy (J)/time (s) or 1 W= 1 J/s. If all the energy of a 700-W microwave oven...
(10) 14. What is the mass of a gold cube (19.3g/cm^3) that is 23mm on a side? 15. What mass of gold (0.126 J/g degree C) requires 26984J of heat to raise the temperature 25.0 degree C?
Consider a 2-m-high electric hot-water heater that has a diameter of 40 cm and maintains the hot water at 60 C. The tank is located in a small room at 20°C whose walls and ceiling are at about the same temperature. The tank is placed in a 44-cm-diameter sheet metal shell of negligible thickness, and the space between the tank and the shell is filled with foam insulation. The average temperature and emissivity of the outer surface of the shell...
2) A person pours 400 g of water at 45°C into an 855-g aluminum container with an initial temperature of 10°c. The specific heat of aluminum is 900 J/(kg-K) and that of water is 4190 J/(kg K). What is the final temperature of assuming no heat is exchanged with the surroundings? A) 3 B) 35°C D) 28°C E) 33°C 3) A heat engine with aneffic ency of 300% performs 300 of work. How much heat is discharged to the lower...
A right triangle has hypotenuse 13 cm and one side 7 cm. Find the length of the other side, and the sine, cosine and tangent of each of the other two angles. A man running 4 m/s is passed by a car at 20 m/s, both heading East. What is the velocity of the man relative to the car? How far apart are the 20 seconds after the car passes the man? A ball is thrown vertically upwards from the...
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