(a) What is the voltage output of a transformer used for rechargeable flashlight batteries if its primary has 500 turns, its secondary has 8 turns, and the input voltage is 124 V? V (b) What input current is required to produce a 4.00 A output? mA (c) What is the power input? W

(a) 1.984 V

(b) 0.064 A

(c) 7.94 Watt

Explanation:

number of turns in primary coil, Np = 500

number of turns in secondary coil, Ns = 8

Voltage in primary coil, Vp = 124 V

(a)

Let the output voltage is Vs.

By using the formula for the transformer

Vs = 1.984 V

(b)

Let the input current is Ip.

Output current, Is = 4 A

Ip = 0.064 A

(c)

Input power, P = Vp x Ip

P = 124 x 0.064

P = 7.94 Watt

the body's situation won't change the forces are equal opposit and on the same body

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.