Chapter 10
Chapter 11
Chapter 12
Chapter 13
If You Dare!
100
Two objects are in what if energy can be exchanged between them?
What is thermal contact?
100
The energy associated with the microscopic molecules of a system is called what?
What is internal energy?
100
Work done on a gas is equal to the negative of the pressure times what?
What is the change in volume?
100
The SI base units for spring constant are which of the following?
What is kg/s^2?
100
A Carnot engine runs between a hot reservoir at Th and a cold reservoir at Tc. If one of the temperatures is either increased or decreased by 3.5 K, which of the following changes would increase the efficiency by the greatest amount?
What is decreasing Tc?
200
Two objects in thermal contact that cannot exchange energy are in what?
What is thermal equilibrium?
200
Mathematically, the specific heat is defined as:
What is c = Q/(m*dT)?
200
The area under the graph on a PV diagram is equal to the magnitude of what?
What is work?
200
A large spring requires a force of 150 N to compress it only 0.010 m. What is the spring constant of the spring?
What is 15 000 N/m?
200
A pound of body fat has an energy content of about 4 100 kcal. If a 1 400-kg automobile had an equivalent amount of translational kinetic energy, how fast would it be moving in mph? (0.447 m/s = 1 mph, 1 kcal = 4 186 J)
What is 350 mph?
300
To convert a Celsius temperature to Kelvin, what must be added?
What is 273.15?
300
A 10-kg piece of aluminum (which has a specific heat of 900 J/(kg*C) is warmed so that its temperature increases by 5.0 deg C. How much heat was transferred into it?
What is 4.5 × 10^4 J?
300
No real engine operating between two energy reservoirs can be more efficient than a what engine operating between the same two reservoirs?
What is a Carnot engine?
300
Tripling the weight suspended vertically from a coil spring will result in the displacement of the spring’s lower end changing by what factor?
What is 3?
300
A mass of 4.0 kg, resting on a horizontal frictionless surface, is attached on the right to a horizontal spring with spring constant 20 N/m and on the left to a horizontal spring with spring constant 50 N/m. If this system is moved from equilibrium, what is the effective spring constant?
What is 70 N/m?
400
The Kelvin is defined as 1/273.16 of the temperature of the triple point of what substance?
What is water?
400
A 2.00-kg copper rod is 50.00 cm long at 23°C. If 40 000 J are transferred to the rod by heat, what is its change in length? c_copper = 387 J/kg•°C and a_copper = 17 × 10-6/°C.
What is 0.044 cm?
400
The volume of an ideal gas changes from 0.40 to 0.55 m^3 although its pressure remains constant at 50 000 Pa. What work is done on the system by its environment?
What is -200 000 J?
400
A tiny spring, with a spring constant of 1.20 N/m, will be stretched to what displacement by a 0.005 0-N force?
What is 4.2 mm?
400
Three identical springs each have the same spring constant k. If these three springs are attached end to end forming a spring three times the length of one of the original springs, what will be the spring constant of the combination?
What is k/3?
500
The thermal expansion coefficient for aluminum is 24 x 10^-6 deg C^-1. The thermal expansion for an aluminum rod 1 m long experiencing a temperature change of 200 deg C is equal to what?
What is 0.0048 m?
500
A slice of bread contains about 100 kcal. If specific heat of a person were 1.00 kcal/kg•deg C, by how many deg C would the temperature of a 70.0 kg person increase if all the energy in the bread were converted to heat?
What is 1.43 deg C?
500
An 800-MW electric power plant has an efficiency of 30%. It loses its waste heat in large cooling towers. Approximately how much waste heat (in MJ) is discharged to the atmosphere per second?
What is 1 900 MJ?
500
The units for the spring constant are what?
What is N/m?
500
A heat engine operates in a Carnot cycle between 80.0°C and 350°C. It absorbs 21 000 J of energy per cycle from the hot reservoir. The duration of each cycle is 1.00 s. The mechanical power output of this engine is what?
What is 9.10 kW?
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