Nichrome is a nickel-chromium alloy used in heating applications like electric toasters, because it has a relatively high resistivity and heats up when a current passes through it. The resistivity of nichrome is 1.50 × 10−6 Ω·m. Suppose you have a nichrome wire 0.219 mm in diameter and 77 cm long. Required:
a. What is the resistance of the nichrome wire?
b. Find the current when a potential difference of 120 V is connected across the wire's ends.

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

If the radius of curvature of the cornea is 0.75 cm when the eye is focusing on an object 36.0 cm from the cornea vertex and the indexes of refraction are as described before, what is the distance from the cornea vertex to the retina? express your answer to two significant

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.