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A cup of hot coffee is placed inside a large, well-insulated container. Over a five minute period, the entropy of the cup decreases by 100 J/K. What can you say about the entropy of the air surrounding the cup?
A block mass of 4.00 kg is pulled 13.7 m along a frictionless horizontal table by a constant 15.8 N force direction 43 degrees above the horizontal. Find the work done by the applied force.
A person is sitting on a freely spinning lab stool (no friction). is her angular velocity increasing or decreasing
A parallel-plate capacitor has fixed charges +Q and -Q. The separation of the plates is then doubled. (a) By what factor does the energy stored in the electric field change? (b) How much work must be done in doubling the plate separation from d to..
an earth satellite moves in a circular orbit 690 km above the earths surface. the period of the motion is 98.4min.a
An air-track glider attached to a spring oscillates with a period of 1.50s . At t=0s the glider is 5.10cm, What is the phase constant
A weightlifter bench-presses a 170.0 kg barbell from his chest to a height equal the length of his arms 0.750 m. What is the potential energy of the barbell relative to the weightlifter\'s chest after he lifts the barbell
A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m. What impulse was given to the ball by the floor
The electric field midway between two equal but opposite point charges is 1430 N/C, What is the magnitude of the charge on each
A potential difference of 4.75 kV is established between parallel plates in air. what is the minimum separation the plates can have without ionizing the air
A sun yacht is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny in everyday circumstances, What is the magnitude of the resulting acceleration
A coil is formed by winding 280 turns of insulated 14 gauge copper wire (diameter = 1.6 mm) in a single layer on a cylindrical form of radius 13 cm. What is the resistance of the coil? The resistivity of copper is 1.69 10-8 ·m. Neglect the thickness ..
1. a static magnetic field does no work on a charge moving parallel to the field.2. the direction of the magnetic field
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