# Home Work

## Home Work

• Submitted By: 12essay
• Date Submitted: 02/23/2009 7:37 PM
• Category: English
• Words: 371
• Page: 2
• Views: 373

10.1 What form of energy is the main source of the thermal energy in each of the following? A) a hot footpath- heat energy from the sun B) an electric iron- electrical energy. C) an overheated wheel bearing- mechanical energy, heat energy, chemical energy 10.2 215/985x100 = 21.8% 10.3 The heat on a hot day from the sun and the temperature around them causes the engine to overheat as the engine does not have a cooling system and when it gets too hot it ceases to function. Whereas on cool days although the engines need to work hard to keep itself warm enough to function, it doesn’t have the concern of overheating as the atmosphere around them help keep it cool. 10.4 A) 18/45x100 = 60% B)your could measure the power of impact the ball has on a surface using some of the equipment that allow you to measure pressure/ amount of energy, and comparing that to the initial speed of the ball to the speed after it rebounded. C) Most of this energy is absorbed into the wall and is lost in friction, air resistance, heat. 10.5 A) heat energy B) most of the energy is lost in the atmosphere and through friction, absorbed into the road. 10.6 this action would cool the room temperature down as we know that heat particles travel to colder ones, which eventually result in the initial room temperature cooling down. 10.7 As it is using the heat to convert into energy, this seems to give the illusion that it has created energy. 10.8 A) It is useless energy. B) High grade energy is useful energy whereas loe grade is useless C) Electrical energy, chemical energy, nuclear, potential, kinetic, radiated energy, 10.9 They could use it to heat up rods which boli water, for steam and use that to operate turbines to “create” power”. B) We have plenty of thermal energy as we are a hot country, so it is useless to us. 10.10A) It is more efficient to operate and it is easy to use. B) In cold weather they do not run the risk of overheating. 10.11 6912 tons