Lost in the physics world... please help me.?

Hey Guys... I'm having some difficulties with the following:



What is -40掳F in degrees celsius?



What is a temperature of 22掳C in degrees Fahrenheit?



The air in a living room has a mass of 72 kg and specfic heat of 1,010 J/(kg 掳C).

What is the change in thermal energy of the air when it warms from 20掳C to 25掳C?



Calculate the change in thermal energy of the water in a pond with a mass of 1,000 kg a specific heat of 4,184 J/(kg 掳C) if the water cools by 1掳C.



Calculate the specifc heat of a metal if 0.5 kg absorbs 9,000 J of thermal energy as it warms by 10掳C.



Calculate the amount of thermal energy required to change a 0.45-kg block of ice at 0掳C if the heat of fusion of water is J/kg.



Calculate the heat of vaporization for water is 2.26x10(to the 6th power) J/kg. what mass of liquid water at 100掳C can be changed to water vapor at 100掳C by adding 1.0x10(to the 6th power) J of thermal energy to the liquid water?



Calculate SOlar Radiation: Averaged over a year in the central US, radiation from the SUN transfers about 200 W to each square meter of Earths surface. IF a house is 10 m long by 10 m wide, how much solar energy falls on the house each second?



Calculate Change in thermal energy: You push down on the handle of a bicycle pump with a force of 20 N. The handle moves 0.3 m, and the pump does not absorb or release any thermal energy. What is the change in thermal energy of the bicycle pump as a result of the work you did on it?



Calculate work: The thermal energy released when a gallon of gasoline is burned in a car's engine is 140 million J. If the engineis 25 percent efficient, how much work does it do when one gallon of gasoline is burned?



-THANKS EVERYONE!Lost in the physics world... please help me.?
For the first two:

You could either go to an online conversion site if you're lazy, or you can use this formula to convert from degC to degF:

degF = (9/5)*degC + 32. To go the opposite way, solve for degC.



The next few questions can be solved by using Q=mc(delta)T where (delta)T is the change in temperature, %26quot;c%26quot; is the specific heat capacity of the medium, m is the mass, and Q is the total energy.



As for the last few, well, here's my attempt at giving you answers:

%26quot;Calculate Solar Radiation%26quot;. If the house is 10mX10m, that's 100 sq.m. So, your equation would look like:

200 W/sqM * 100 sq.M = 20 000 W = 20kW. That is assuming a perfect rectangle and that the house is directly underneath the Sun, with no other obstacles in the way.



The other ones I'm not going to answer for you, as I pretty much did your whole assignment already.



Good luckLost in the physics world... please help me.?
e=mCv(t2-t1) can be used for most of these questions.

solving for one of the variables by using the others will get to your answer.

Make sure units cancel out, and you should be fine.

the celsius to farenheit , can be calculated using the equation

celsius to farenheit= C*(9/5) + 32

fareheit to celsius=F-32 *(5/9)

Work=force*distanceLost in the physics world... please help me.?
i m giving answers to first five of your questions:-

1) - 40 degree celcius

2)71.6 deree F

3)363.6 kJ

4)4184 kJ

5)1800 J/(kgC)

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