Purchase Solution

Heat, harmonics, power, calories, efficiency, velocity, wave

Not what you're looking for?

Ask Custom Question

Must show all steps for answering problem if possible.

1. If you compare the temperature that water boils at sea level and at 5000 feet, what is true?

2. The frequency of the second harmonic of a wave is 1000hz. What is the frequency of the third harmonic ?

3. water flows over a waterfall 10m to a turbine. Water flows at a rate of 10kg/sec. How much power is delivered to the turbine?

4. How many calories per second is generated by the turbine?

5. Water flows over a waterfall into a turbine as the above. The turbine is connected to a generator that generates electricity that runs a heater that heats 100 grams of water. How long does it take to raise the temperature of the water 4 degrees C?
There are no losses of any kind . How long does it take to raise the water in the cup to 4 degrees C?

6. A gasoline engine fuel burns at a temperature of 500 degrees C. its radiator cools to 70 degrees C. What is the engine's Carnot efficiency?

7. A 1.25 meter long wire has a mass of 150 grams. The wire is stretched with a force of 2 newtons. What is the velocity of a wave along the wire?

8. Concrete has a specific heat capacity of 670 joules/kg-degrees C. A 2kg concrete block, that has a temperature of 20 degrees C, is dropped from a height of 100 meters. What is its temperature after it hits the ground if it lost no heat to the surrounding environment?

9. Referring to the above problem, the block is now raised back to 100 meters with out losing or gaining heat from the environment. What is the blocks temperature after it was raised?
a. Less than it was after it fell
b. This can't be determined
c. 20 degrees C, the same as it was before it fell

10. Waves travel 5000m/s along a wire that is 2m long. What is the wave length of its first harmonic?

11. What is the frequency of the first harmonic?

Purchase this Solution
Solution Summary

Heat, harmonics, power, calories, efficiency, velocity, and waves are examined.

Solution Preview

Please refer to the attachment.

1. If you compare the temperature that water boils at sea level and at 5000 feet, what is true?

Answer: Boiling temperature of a liquid depends upon the air pressure on its surface; lower the pressure lower the boiling temperature. At 5000 feet, the air pressure is lower than that at sea level. Hence, boiling temperature at 5000 ft is lower than that at sea level.

2. The frequency of the second harmonic of a wave is 1000 Hz. What is the frequency of the third harmonic?

Answer: Second harmonic wave has a frequency double the fundamental frequency. Hence, fundamental frequency is 1000/2 = 500 Hz. Third harmonic has a frequency three times the fundamental frequency. Hence, third harmonic has a frequency 3 x 500 = 1500 Hz.

3. Water flows over a waterfall 10m to a turbine. Water flows at a rate of 10kg/sec. How much power is delivered to the turbine?

Answer: Water flowing per sec. = m = 10 kg, Height = h = 10 m.

Power delivered to the turbine = Potential energy of water ...

Purchase this Solution
Free BrainMass Quizzes
Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

The Moon

Test your knowledge of moon phases and movement.

Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

View More Free Quizzes
Related BrainMass Solutions

  • Evaluating Standing Waves

    d) What would be the fundamental frequency if we decreased the velocity of sound in air to 320 m/sec?

  • Problems in estimating power, energyand efficiency

    Power output Power input Power efficiency of the cell is Usually power efficiency is expressed as a % so % power efficiency of the cell 2. An "energy bar" contains 27 g of carbohydrates.

  • efficiency of heat energy

    An engine takes in 4.7 calories of heat and discharges 3.5 calories of heat. What is its efficiency? 4. A certain otto cycle has a 7.0 compression ratio. if the working fluid has a "gamma" of 1.4 what is its efficiency?

  • Wave, Heat and Light in Statistical Mechanics Approach

    A wave demonstrator which consists of rods and spring is studied using differential equations. The wave propagation velocity is found.

  • Group Velocity of Phase Waves

    54808 Waves, Heat and Light 300 level in Undergraduate Assume that the phase velocity of waves in some dispersive medium is given as a function of wave length lamda by the relationship see attached Express the group velocity in terms of lamda

  • Various Practice Problems

    ..), v is the wave velocity of the string and L is the length of the string.

  • Multiple choice questions-mechanics and heat/thermodynamics

    a: 9kg m/s b: -12 kg m/s c: 15 kg m/s d: 3 kg m/s Question 11 : The exhaust temperature of a Carnot heat engine is 350 degree C. What is the intake temperature if the efficiency is 25.0%? a: 400 deg. C b: 543 deg. C c: 558 deg.

  • Heat

    (each has a mass of 60 kg. assume that a body transfers energy with the efficiency of 20 %) They have to burn 1000 calories. ( assuming each overate 500 calories ; the problem is not very clear on this) 1000 calories= 1000 X 4.2= 4200 Joules

  • Comunication technology

    It describes how to find a fundamental sine wave and harmonics, as well as references lowpass filters.

View More Related Solutions