Need help with physics and 6 short questions

deadline is 6 hour budget is $15   i need answer with complete details how you get answer

1-A 20 g piece of metal has a temperature of 100 C. It is quickly placed in 100 g of water at 20 C. The final temperature of the metal and water is 30 C. What is the specific heat of the metal?

A- 0.19 cal/g C

B- 0.22 cal/g C

C- 0.57 cal/g C

D- 0.71 cal/g C

How can I solve it?

2- How much heat is required to completely convert 300 g of ice initial at 0 C to steam at 100 C?

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3- A 2000 kg car, traveling at 30 m/s, is brought to a complete stop applying the brakes. How much heat is generated in this process?

A- 3.6 kcal

B- 15 kcal

C- 215 kcal

D- 72 kcal 

How can solve it

4- What is the wavelength of a sound wave with a frequency of 1500 Hz if the speed of sound is 340 m/s?

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5- A tuning fork vibrating with frequency of 440 Hz produces a fundamental standing sound wave in a pipe closed at one end. If the speed of sound in air is 330 m/s, what is the length of the pipe?

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6- A typical candy bar has 240 dietary calories. If all of the energy from a candy bar were transferred to ice at 0 C, how much ice (i.e. how many grams) could be melted to from water at 0 C?

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