Other Physics Answers

A sinusoidal wave travelling in the positive x-direction has a wavelength of 0.4 m, an amplitude of 20 cm, and a period of 4 seconds. The transverse position of an element of the medium at x = 0 and t = 0 is y = 10 cm, and the element is moving downward. The expression of the wave function describing this wave is:

How much heat is required to change 10g of ice at exactly 0°C to steam at 100°C ?

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.

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 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 ?

A 1200-kg car going 30 m/s applies its brakes and skids to rest. If the friction force between the sliding tires and the pavement is 6000 N, how far does the car skid before coming to rest ?