Other Physics Answers

A wire of length 4.0 m with a cross-sectional

area of 3.2x10–6 m2 has a resistance of 0.065 Ω.

Determine the resistivity of the wire.

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 ?