Physics Waves And Oscillations Level: High School
A load of 50 N attached to a spring hanging vertically stretches the spring 5.0 cm . The spring is now placed horizontally on a table and stretched 11 cm .a) What force is required to stretch the spring by that amount ?
b) Plot a graph of force (on the y-axis) versus spring displacement from the equilibrium position along the x-axis .
Physics Heat & Thermodynamics Level: High School
An engine absorbs 1700 J from a hot reservoir and expels 1200 J to a cold reservoir in each cycle .a) What is the engine’s efficiency ?
b) How much work is done in each cycle ?
c) What is the power output of the engine if each cycle lasts for 0.300 s ?
Physics Heat & Thermodynamics Level: High School
A heat engine operates between two reservoirs at temperatures of 20 degrees C and 300 degrees C . What is the maximum efficiency possible for this engine ?
Physics Heat & Thermodynamics Level: High School
A 5.0 kg block of aluminum is heated from 20 degrees C to 90 degrees C a atmospheric pressure . Finda) The work done by the aluminum
b) The amount of energy transferred to it by heat
c) The increase in its internal energy
Physics Heat & Thermodynamics Level: High School
Sketch a PV diagram of the following processes :a) A gas expands at constant pressure P1 from volume V1 to volume V2 . It is then kept at constant volume while the pressure is reduced to P2 .
b) A gas is reduced in pressure from P1 to P2 while its volume is held constant at V1 . It is then expanded at constant pressure P2 to a final volume V2 .
c) In which of the processes is more work done by the gas ? why ?
Physics Heat & Thermodynamics Level: High School
One mole of a monatomic idea gas at and initial pressure of 4 atm and temperature of 300 K is carried though the following reversible cycle :1) It expands isothermally until it volume is doubled ;
2) It is compressed to its original volume at constant pressure ;
3) It is compressed isothermally to a pressure of 4 atm; and
4) It expands at constant pressure to its original volume .
a) Make an accurate plot of the cyclic process on a PV diagram .
b) Calculate the work done by the gas per cycle .
c) What is the efficiency of an engine operating in this cycle ?
Physics Heat & Thermodynamics Level: High School
The figure at “click here” represents n moles of an ideal monatomic gas being taken through a reversible cycle consisting of two isothermal processes at temperature 3To and To and two constant-volume processes . Determine in terms of n, R, and To (a) the net heat transferred to the gas and (b) the efficiency of an engine operating in this cycle .
Physics Properties Of Matter Level: High School
Elasticity
At 20 degrees C , a steel rod of length 40000 cm and a brass rod of length 30000 cm, both of the diameter, are placed end to end between two rigid supports 70000 cm apart , with no initial stress in the rods . The temperature of the rods is now raised to 60 degrees C .a) What is the stress (the same in both rods) at 60 degrees C ?
b) How far from its old position is the new junction between the rods ?
Physics Heat & Thermodynamics Level: High School
An aluminum rod conducts 8.40 cal/s from a heat sources maintained at 2.10E 2 degrees C to a large body of water at 24 degrees C . Calculate the rate entropy increases per unit time in this process .
Physics Heat & Thermodynamics Level: High School
A heat engine utilizes a heat source at 5.4E 2 degrees C and has an ideal (Carnot) efficiency of 25% . To increase the ideal efficiency to 36% ,what must be the temperature of the heat source ?
Physics Heat & Thermodynamics Level: High School
Air modeled as an ideal diatomic gas (y = 1.40) goes through the following cycle :1„³ 2 Constant pressure expansion from P1 = 1000 kPa , V1 = 0.200 m^3 to V2 = 0.400 m^3. T1 = 800 K .
2„³3 Adiabatic expansion to V3 = 0.800 m^3 .
3„³4 Constant pressure compression
4„³1 Adiabatic compression to the original state .
1) Find the work and heat transfer for each process . Determine whether the work or heat transfer is positive or negative .
2)Determine the total work done in the cycle .
3)Determine the total heat transfer in the cycle .
4)Sketch the process on a PV diagram .
Physics Heat & Thermodynamics Level: High School
1 kg of ice at -30 degrees C is converted to steam at 120 degrees C . Calculate the heat transfer for each process . Determine the total heat transfer . Calculate the entropy change for each process . Determine the total entropy change . .
Physics Heat & Thermodynamics Level: High School
Conduction
A water heater is covered with insulation boards over a total surface area of 3.00 m^2 . The inside board surface is at 75 degrees C , the outside surface is at 20 degrees C , and the board material has a conductivity of 0.08 W/m.K . How thick should the board be to limit the heat transfer loss to 200 W ?
Physics Waves And Oscillations Level: High School
For lunch you and your friends decide to stop at the nearest deli and have a sandwich made fresh for you with 0.350 kg of turkey . The slices of turkey are weighed on a plate of mass 0.460 kg placed atop a vertical spring of negligible mass and force constant of 267 N/m . The slices of turkey are dropped on the plate all at the same time from a height of 0.350 m . They make a totally inelastic collision with the plate and set the scale vertical simple harmonic motion (SHM) . You may assume that the collision time is extremely small .a) What is the amplitude of oscillations A of the scale after the slices of turkey land on the plate ?
b) What is the angular frequency of the oscillation ?
c) What is the period of oscillation T of the scale ?
Physics Heat & Thermodynamics Level: High School
An engine goes through the following cycle with 3.00 moles sample of a diatomic gas .(i) An isothermas expansion from point a to point b
(ii) a constant pressure compression from point b to point c .(iii) an adiabatic compression from point c to point a . we giving point a has a temperature 498 K , and a volume 1.40 x 10^-3 m^3 .
a) What is the pressure in Pascals at point a ?
b) What is the pressure in Pascals at point b if the volume of point b is 0.270 m^3 ?
c) What is the volume at point c ?
d) What is the temperature at point c ?
e) What is the change in internal energy for process II (constant pressure ) ?
f) What is the work done in process II ?
g) What is the heat transfer in process II ?
