# Physics 11th Grade "HEAT' 2

1) Emily is testing her baby's bath water and finds that is too cold,so she adds some hot water from kettle on the stove. If Emily adds 2.00 kg of water at 80.0 degree celcius to 20.0 kg of bath water at 27.0 degree celcius , what is the final temperature of the bath water?

2) Finishing his ginger ale, Ramesh stands at party holding his insulated foam cup that has nothing in it but 0.100 kg of ice at 0 degree celicus. How much heat must be gained by the ice in order for all of it to melt?

1. 👍
2. 👎
3. 👁
1. (a)
cm₁(80-T)=cm₂(T-27)
2(80-T)=20(T-27)
T=31.8 ℃
(b)
λ= 330000 J/kg
Q= λm=330000•0.1 =33000 J

1. 👍
2. 👎
2. 66

1. 👍
2. 👎
3. Pppzz
Liz

I

1. 👍
2. 👎

## Similar Questions

1. ### Chemistry

A student collected H2 gas in a buret by displacing water at 22.0 °C. The buret could not be submerged deep enough in a water bath to equalize the pressure. The water level in the buret was 18.2 cm above the water level in the

2. ### Physics

You decide to take a nice hot bath but discover that your thoughtless roommate has used up most of the hot water. You fill up the tub with 270 kg of 30.0°C water and attempt to warm it further by pouring in 5.00 kg of boiling

3. ### math

Emily has a coupon for 20% off her purchase. She finds a backpack on the discount rack. It's original price is \$60 but is 30% off. Emily thinks 30% and 20 % make 50% so the backpack will be \$30. Is Emily correct? Explain your

4. ### chemistry

A biology experiment requires the preparation of a water bath at 37.0°C (body temperature). The temperature of the cold tap water is 22.0°C, and the temperature of the hot tap water is 55.0°C. If a student starts with 70.0 g of

1. ### Phyiscs

Please show work You decide to take a nice hot bath but discover that your thoughtless roommate has used up most of the hot water. You fill the tub with 270 kg of 30.0°C water and attempt to warm it further by pouring in 5.00 kg

2. ### English

What can we do to save water? 1. We can turn off the water when we are not using it. 2. We can turn off the water when we are brushing teeth. 3. We can use only a little water when we wash face. 4. We can use a little water when

3. ### chemistry

Determine the specific heat of a metal from the following data. A 75 g piece of the metal at 100.0 C was placed into an ice water bath. The heat loss from the metal melted 255g of ice. Some unmelted ice remained in the ice water

4. ### physics

Abath contains 100kg of water at 60°C.Hot and cold taps are then turned on to deliver 20kg per minute each at temperatures of 70°C and 10°C respectively. How long will it be before the temperatures in the bath have dropped to

1. ### PHYSICS

A BATH CONTAINS 100 KG OF WATER AT 60 DEGREES CELCIUS. HOT AND COLD TAPS ARE THEN TURNED ON TO DELIVER 20KG PER MINUTE EACH A TEMPERATURE 70 DEGREES CELSIUS AND 10 DEGREES CELSIUS RESPECTIVELY. HOW LONG WILL IT BE BEFORE THE

2. ### Chem again

The solubility of Acetanilide in hot and cold water is: Temperature.........Solubility in 100ml H20 100C....................5.5g 0C........................0.53g What is the maximum recovery if 5.0g of acetanilide is recrystallized

3. ### Chemistry

Consider a 67-g chunk of ice (∆Hfus = 6.0 kkJ/mol) in a beaker immersed in a water bath. To produce just enough heat to melt the ice, how many moles of solid NaOH (∆Hsoln = -445.1 kJ/mol) must you dissolve in the water bath?

4. ### physics

Emily is testing her baby’s bath water and finds that it is too cold, so she adds some hot water from a kettle on the stove. If Emily adds 2.00 kg of water at 80.0° C to 20.0 kg of bath water at 27.0° C, what is the final