A waterfalls is 90m high. Assume that all of the potential energy possessed by the water at the top is completely converted to heat energy. What will be the temperature difference between the water...

A waterfalls is 90m high. Assume that all of the potential energy possessed by the water at the top is completely converted to heat energy. What will be the temperature difference between the water...

A typical lightning strike can transfer 109 J of energy across a potential difference of 5×107 V during a time interval of 0.2 s. Use this information to estimate:

An ideal gas (Cp/Cv = γ) is taken through a process in which the pressure and the volume vary as P = KVa. Find the value of a for which the specific heat capacity in the process is zero.

A typical polycrystalline solar cell runs at about 16% at room temperature, but the efficiency decreases about 0.4% per °C above room temperature. Provide an explanation (< 50 words) for...

In an attempt for a physics teacher to explain the conservation of energy to a student, the teacher goes down a 6.0 m high sliding board. At the bottom, he only travels 7.0 m/s. If the mass of the...

in a thermal pot, there is a layer of vacuum in the outer wall, an inner pot lid and an outer pot lid. Please help me to clarify these questions: 1....

When 25.0 mL of 1.0 M H2SO4 is added to 50.0mL of 1.0M of NaOH at 25.0 degrees C in a calorimeter, the temperature of the aqueous solution increases to 33.9 degrees C. Assuming that the specific heat...

You place a very hot piece of aluminum (T=120 degrees C, c=900 J/(kg*degrees C) into a 500ml beaker of water that is already at an initial temperature of 90.0 degrees C. The mass of this piece of...

an electric kettle is required to heat 0.6 litre of water from 10°C to boiling point in 5 min, the supply voltage being 240V. The effeciency of the kettle is 78% (a) calculate the resistance of the...

I'm reviewing some practice thermodynamics questions for my upcoming physics exam but I can't figure out how to set these up properly. 1. If you mix two parts hot 80° C water with one...

Explain briefly about convection and radiation

Calorimetry a. How much heat needs to be taken from 0.5 kg of ethyl alcohol as a gas at its boiling point of 78.0 C to a solid at its freezing point -114 C if the latent heat of vaporization...

A metal sample weighing 220. g is heated to 95.0 Celsius and then placed into 190. ml of water at 46.6 celcius. the final temperature of the water is 51.6 celcius. How much heat was transferred from...

If a cup of tea (190.0 ml, 86.0 celcius) is cooled by adding an ice cube (30.0 g, -10.0 celcius), what is the final temperature of the tea? The heat required to melt ice (heat of fusion) is 80.0...

Table 1 Arctic Sea Ice Loss During the 2014 Arctic Melt Season Date ...

How many homes could be heated from this source assuming heating requirements of 40 kWh/d per house?

A thermal power plant produces 82 MWh/d of excess heat energy. How many homes could be heated from this source assuming heating requirements of 40 kWh/d per house?

How much power is required to cool a house to 22oC on a 40oC day if the "leakiness" (heat-loss coefficient) of the house is 3.6 kWh/d/oC? You may assume that the air-conditioner cooling...

A coal engine burning at 1650 °K delivers heat energy to a reservoir at 340°K. If this same engine turns 1000 J of input energy into 670 J of useful work what is its efficiency? Considering...

1. heat energy can be measured in a. joules b. calories c. "C"alories Calories d. all of theses...