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The heating element of a simple heater consists of a 1.9-m-long, 0.65-mm-diameter nichrome wire. When plugged into a 120 V outlet, the heater draws 7.0 A of current when hot.
(part A) What is the wire's resistance when it is hot? (in ohms)
(part B) Use your answer to part A to calculate the resistivity of nichrome in this situation. (in ohms x m)
A ray of light is incident from the air onto the surface of a diamond (n=2.42) at a 30 degree angle to the normal, calculate the speed of light in the diamond
A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 28.5° and the angle of refraction is 16.6°, find the critical angle for the liquid
A 40-kg pole vaulter running at 14 m/s vaults over the bar. Her speed while she is above the bar is 1m/s. Avoid air resistance, in addition to any energy absorbed by the pole, and determine her altitude as she crosses the bar.
A pen contains a spring with a spring constant of 251 N/m. How much work is done by the spring force to ready the pen for writing
A 720 nm light bean in air hits the flat surface of a certain plastic and the bean is split into a reflected ray and a refracted ray. what is the index of refraction of the plastic
question1a 380 kg piano slides 3.9m down a 27 degree incline and is kept from accelerating by a man who is pushing back
A fire in an enclosure has reached flashover, & the gas temperature is assumed to be uniform at 1000oC. The enclosure has an opening 3 m wide & 2 m high. Find the position of the neutral layer, measured from the bottom of the opening.
A transverse wave on a string is described by the following wave function. y =0.085 sin((pie/12x) +(5piet)), What is the speed of propagation of this wave
Neptune has a mass 17.20 times larger than that of Earth and a radius 3.88 times larger. A person weighing 140 lb on the Earth would weigh how much on Neptune.
A dumbbell is made of two spheres, which each have a mass M and a radius r - and a massless stick af length L. What is the torque acting on the dumbbell
You are given a sample of metal and asked to determine its specific heat. You weigh the sample and find that its weight is 26.0N, What is the sample's specific heat
A 20000kg rocket has a rocket motor that generates 3.0×10^5 N of thrust. What is the rocket's initial upward acceleration
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