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A 50-g piece of metal at 95°C is dropped into 250g of water at 17°C and warms it to 19.4°C. What is the specific heat of the metal?
What will be the final temperature if 50g of water at exactly 0°C is added to 250g of water at 90°C?
How many calories are required to heat each of the following from 15 °C to 65 °C? (a) 3.0g of aluminum, (b) 5.0g of pyrex glass, (c) 20g of platinum. The specific heats, in cal/g C, for aluminum, pyrex, and platinum are 0.21, 0.20, and 0.032, repectively.
On your cousin’s wedding day you leave for the church 45.0 min before the ceremony is to begins, which should leave plenty of time since the church is only 30.0 km away.On the way, however, you have to make an unanticipated stop because of road construction work.As a result, your average speed for the first 15 min is only 10.0 km/h.
What average speed do you need to have on the remainder of the trip to get you to the church on time
A 55.0m wire carries a current of 2.25 A in a location where Earth's magnetic field is 4.5 x10-3 T. Ther wire experiences a force of 0.15 N. Find the angle between the wire and the magnetic field.
1. What are the electric field and electric flux of a sphere with a radius of 0.500 m and carries a charGe of +1.00 uc at its center?
A charge of 3,600 C passes through an electric lamp in 3.0 min. What is the
current in the lamp?
A liquid of unknown specific heat at a temperature of 20oC was mixed with water at 80oC in a well-insulated container. The final temperature was measured to be 50oC, and the combined mass of the two liquids was measured to be 240g. In a second experiment with both liquids at the same initial temperatures, 20 g less of the liquid of unknown specific heat was poured into the same amount of water as before. This time the equilibrium temperature was found to be 52oC. Determine the specific heat of the liquid.
A pumps lifts water from a lake to a large tank 20 m above the lake. How much work against gravity does the pump do as it transfers 5.0m^3 of water to the tank? One cubic meter of water has a mass of 1000 kg.
A 0.25-hp motor is used to lift a load at the rate of 5.0 cm/s. How great a load can it lift at this constant speed ?
