9. A 60.0-gram lead bullet hits a steel plate, both initially at 19 °C. The bullet melts and splatters on impact. Assuming that the bullet receives 78% of its kinetic energy as heat energy, at what minimum speed must it be traveling to melt on impact? (The melting temperature of Lead is 327°C) m/s

9. A 60.0-gram lead bullet hits a steel plate, both initially at 19 °C. The bullet melts and splatters on impact. Assuming that the bullet receives 78% of its kinetic energy as heat energy, at what minimum speed must it be traveling to melt on impact? (The melting temperature of Lead is 327°C) m/s

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter1: Temperature And Heat

Section: Chapter Questions

Problem 91P: Calculate the rate of heat conduction out of the human body, assuming that the core internal...

See similar textbooks

Similar questions

A Styrofoam box has a surface area of 0.80 m and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0C, and the outside temperature is 25C. If it takes 8.0 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam.
Calculate the rate of heat conduction out of the human body, assuming that the core internal temperature is 37.0 , the skin temperature is 34.0 , the thickness of the fatty tissues between the core and the skin averages 1.00 cm, and the surface area is 1.40 m2.
Week 4 #19 A copper bar of thermal conductivity 401 W/(m·K) has one end at 114°C and the other end at 24.0°C. The length of the bar is 0.110 m, and the cross-sectional area is 1.00 × 10−6 m2. If two such bars were placed in parallel (side by side) with the ends in the same temperature baths, what would the rate of heat conduction ? be? ______W
Week 4 #18 A copper bar of thermal conductivity 401 W/(m·K) has one end at 114°C and the other end at 24.0°C. The length of the bar is 0.110 m, and the cross-sectional area is 1.00 × 10−6 m2. If two such bars were placed in series (end to end) between the same constant-temperature baths, what would the rate of heat conduction ? be? ______W
9.) A 100 lb steel casting at 2700 degrees Farenheit is placed on a 300 lb copper plate - the plate is 18 inches by 9 inches and the copper plate is at a temperature of 100 degrees Farenheit. What is the final temperature of the comined two materials? assume there is no heat loss to the surrounding air. round final answer two decimal places. Heat constants: Copper - melting point of 1083 degrees C, boiling point of 2330 degrees C, specific heat of 0.092, 390 J/kg degrees C, Heat of fusion 49.0 kcal/kg, Iron(steel) - Melting point of 1540 degrees C, boiling point of 3000 degrees C, specific heat of 0.115 k/cal degrees C, heat of fusion 7.89 kcal/kg a.) TF = _____________ degrees Farenheit b.) does the copper plate melt? ________
11. A tank of 10ft3 capacity is half filled with glycerin. The weight density of glycerin is 78.6 lbs/ft3 and its specific heat is 0.57 BTU/lb-°F. (a) How much heat is needed to raise the temperature of glycerin from 40°F to 70°F? (b) If the heat supplied to the glycerin is at a rate of 750 BTU/min, at what rate does its temperature rises? 12. How much joules are needed to change 100 grams of water at 10°C to steam at 120°C
Week 4 #17 A copper bar of thermal conductivity 401 W/(m·K) has one end at 114°C and the other end at 24.0°C. The length of the bar is 0.110 m, and the cross-sectional area is 1.00 × 10−6 m2. What is the rate of heat conduction ? along the bar? _______W
A tank of 10ft3 capacity is half filled with glycerin. The weight density of glycerin is 78.6 lbs/ft3 and its specific heat is 0.57 BTU/lb-°F. (a) How much heat is needed to raise the temperature of glycerin from 40°F to 70°F? (b) If the heat supplied to the glycerin is at a rate of 750 BTU/min, at what rate does its temperature rises? (INCLUDE FBD)
On a cold winter morning you step outside to get into your car and drive to work. Your car's windshield is covered with ice at −15.3°C. If the area of the windshield is 1.40 m2 and it takes 1.97 105 J of heat to melt the ice, how thick was the ice covering the windshield? The latent heat of fusion of ice is 334 kJ/kg, the specific heat of ice is 2092 J/(kg · °C) and its density is 917 kg/m3.
1. Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.85, and surface temperature is 30℃. Determine the rate of heat loss from that person by radiation in a large room whose walls are at a temperature of (a) 300K and (b) 280K.
1. A cube of ice is taken from the freezer at -8.5 •C•C and placed in a 75-gg aluminum calorimeter filled with 330 gg of water at room temperature of 20.0 •C•C. The final situation is observed to be all water at 15.0 •C•C. The specific heat of ice is 2100 J/kg - CoJ/kg•Co, the specific heat of aluminum is 900 J/kg •CoJ/kg•Co, the specific heat of water is is 4186 J/kg• CoJ/kg•Co, the heat of fusion of water is 333 kJ/KgkJ/Kg. What was the mass of the ice cube? 2. When a 290-gg piece of iron at 180 •C•C is placed in a 95-gg aluminum calorimeter cup containing 250 gg of liquid at 10• C•C, the final temperature is observed to be 35 • CoC. The value of specific heat for iron is 450 J/kg •CoJ/kg •Co, and for aluminum is 900 J/kg-CoJ/kg-Co. Determine the specific heat of the liquid.
9.3 kg of copper sits at a temperature of 38 f. how much heat is required to raise the temperature to 908 f? the specific heat of copper is 385 j/ kg -c. please answer in exponential form.