How long does it take the Sun to melt a block of ice at 0∘C with...
How long does it take the Sun to melt a block of ice at 0∘C with a flat horizontal area 1.0 m2 and thickness 2.0 cm ? Assume that the Sun's rays make an angle of 45 ∘ with the vertical and that the emissivity of ice is 0.050.
Express your answer using two significant figures.
Homework Answers
Part A How long does it take the Sun to melt a block of ice at...
Part A How long does it take the Sun to melt a block of ice at 0∘C with a flat horizontal area 1.0 m2 and thickness 2.0 cm ? Assume that the Sun's rays make an angle of 44 ∘ with the vertical and that the emissivity of ice is 0.050. Express your answer to two significant figures and include the appropriate units. 2.12min , or 127.7s, or 130s incorrect
Question 1: A nuclear power plant operates at 70 % of its maximum theoretical (Carnot) efficiency...
Question 1: A nuclear power plant operates at 70 % of its maximum theoretical (Carnot) efficiency between temperatures of 660 ∘C and 340 ∘C. If the plant produces electric energy at the rate of 1.3 GW , how much exhaust heat is discharged per hour? Question 2: How long does it take the Sun to melt a block of ice at 0∘C with a flat horizontal area 1.0 m2 and thickness 2.0 cm ? Assume that the Sun's rays make...
How much heat, in kcal, does it take to melt a 500 gram block of ice...
How much heat, in kcal, does it take to melt a 500 gram block of ice originally at 0.0 C until it is liquid water at 25.0 C? Please show work. Thank you!
How much ice in grams would have to melt to lower the temperature of 346 mL...
How much ice in grams would have to melt to lower the temperature of 346 mL of water from 45 ∘C to 0 ∘C? (Assume that the density of water is 1.0 g/mLg/mL.) Express your answer using two significant figures. m= g
How long does it take light to travel from the sun to Venus? Express your answer...
How long does it take light to travel from the sun to Venus? Express your answer to three significant figures in seconds.
How much heat is needed to take a 64.9 gram block of ice from -22.2o C...
How much heat is needed to take a 64.9 gram block of ice from -22.2o C to 22.2o C? Answer in Calories to 3 significant figures.
How much force does it take to stretch a 20-m-long, 1.0 cm -diameter steel cable by...
How much force does it take to stretch a 20-m-long, 1.0 cm -diameter steel cable by 5.0 mm ? Express your answer using two significant figures. Thank you!
Please be specific with the numbers I should enter for part c on the diagram. <HW-5A...
Please be specific with the
numbers I should enter for part c on the diagram.
<HW-5A Geometrical Optics Item 18 18 of 20 Constants Part (Figure 1) shows a small plant near a thin lens. The ray shown is one of the principal rays for the lens. Each square is 1.0 cm along the horizontal direction, but the vertical direction is not to the same scale. Use information from the diagram to answer the following questions. Locate the image by...
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...
Please be specific with the
numbers I should enter for part c on the diagram.
<HW-5A Geometrical Optics Item 18 18 of 20 Constants Part (Figure 1) shows a small plant near a thin lens. The ray shown is one of the principal rays for the lens. Each square is 1.0 cm along the horizontal direction, but the vertical direction is not to the same scale. Use information from the diagram to answer the following questions. Locate the image by...
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...
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