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A refrigerator uses an ideal Carnot cycle to cool its interior. The outside air has a temperature of 304 K and the refrigerator is kept at a temperature of 279 K.
1) What is the coefficient of performance of this refrigerator?
2) If the refrigerator does 1500 J of work on the working substance, how much energy is transferred out of the refrigerator's interior?
3) In the scenario described in the previous question, how much energy is transferred into the outside air?
A block of weight 43.6 N is hanging from a rope. The tension from the rope is pulling upward on the block. The block is accelerating upward at a rate of 1.22 m/s^2. What is the magnitude of the tension in the rope?
How did Pavlov and Watson's focus on scientific inquiry of behaviours differ from earlier viewpoints of structuralisms, psychoanalysts, and functionalists.
A student in an undergraduate physics lab is studying Archimede's principle of bouyancy. The student is given a brass cylinder and using a triple beam balance finds the mass to be 1.25 kg
The concrete wall of a building is 0.10m thick. The temperature inside the building is 20.0 °C, while the temperature outside is 0°C. Heat is conducted through the wall.
A skier wears a jacket filled with goose down that is 15 mm thick. Another skier wears a wool sweater that is 7.00 mm thick. Both have same surface area.
A cylinder of gas at room temperature (20°C) has a pressure p1. To what temperature in degrees Celsius would the temperature have to be increased for pressure to be 2.7p1.
An object is lifted vertically 2m and held there. If the object weighs 30N, how much work was done in lifting it. Describe it briefly.
Suppose you have a lens system that is to be used primarily for 770 nm light. What is the second thinnest coating of fluorite that would be nonreflective for this wavelength
The leg and cast weigh 220 N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w1 weighs 135 N. find the weight w2 and the angle α needed so that no force is exerted on the hip joint by the leg plus cast.
What is the magnitude of the force on the electron from the uranium ion?
A car of mass M = 1200 kg traveling at 45.0 km/hour enters a banked turn covered with ice. The road is banked at an angle theta, and there is no friction between the road and the car's tires.
If a vehicle is traveling at velocity v and takes a distance d to stop, then how fast is a vehicle traveling if it takes a distance of 3d to stop. suppose mass and acceleration are equal.
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