An electric current heats a 221 g copper wire from 20.0°C to 38.0°C. How much heat was generated by the current? (ccopper = 0.093 kcal/kgC°) Click here to see the answer
(10.0K)
A bicycle and rider have a combined mass of 100.0 kg. How many calories of heat are generated in the brakes when the bicycle comes to a stop from a speed of 36.0 km/h? Click here to see the answer
(55.0K)
A 15.53 kg loose bag of soil falls 5.50 m at a construction site. If all the energy is retained by the soil in the bag, how much will its temperature increase? (csoil = 0.200 kcal/kgC°) Click here to see the answer
(50.0K)
A 75.0 kg person consumes a small order of french fries (250.0 Cal) and wishes to "work off" the energy by climbing a 10.0 m stairway. How many vertical climbs are needed to use all the energy? Click here to see the answer
(29.0K)
A 0.5 kg glass bowl (cglass = 0.2 kcal/kgC°) and a 0.5 kg iron pan (ciron = 0.11 kcal/kgC°) have a temperature of 68°F when placed in a freezer. How much heat will the freezer have to remove from each to cool them to 32°F? Click here to see the answer
(46.0K)
A sample of silver at 20.0°C is warmed to 100.0°C when 896 cal is added. What is the mass of the silver? (csilver = 0.056 kcal/kgC°) Click here to see the answer
(28.0K)
A 300.0 W immersion heater is used to heat 250.0 g of water from 10.0°C to 70.0°C. About how many minutes did this take? Click here to see the answer
(50.0K)
In an electric freezer, 400.0 g of water at 18.0°C is cooled, frozen, and the ice is chilled to -5.00°C. (a) How much total heat was removed from the water? (b) If the latent heat of vaporization of the Freon refrigerant is 40.0 cal/g, how many grams of Freon must be evaporated to absorb this heat? Click here to see the answer
(57.0K)
A heat engine is supplied with 300.0 cal and rejects 200.0 cal in the exhaust. How many joules of mechanical work was done? Click here to see the answer
(11.0K)
A refrigerator removes 40.0 kcal of heat from the freezer and releases 55.0 kcal through the condenser on the back. How much work was done by the compressor? Click here to see the answer
(11.0K)
Click here to see the answer
(37.0K)