Physics Answers

a dynamo delivers 30.0 a at 120 v to an external circuit when operating at 1200 rpm. what torque is required to drive the generator at this speed if the total power losses are 400 W?e

a pipe of radius 7m contain natural oil of density 800 and moves at velocity 25m/s the pipe is branched into 2 tubes of A and B if ra equal 2m and rb equal 4m also va equal 10m/s if there was a leakage in the pipe of flow 2m³/s what's the mass of flowing in the pipe in 10 min and what is the velocity of the tube B

1. A student has designed his own thermometer with a temperature scale called S. Here 

he has marked the freezing point of water as 20 °S and the boiling point of water as 

150 °S. The S scale has 130 divisions.

(a) By drawing a suitable diagram, express the relation (mathematical equation) 

between 𝑇𝐶 (temperature in Celsius) and 𝑇𝑆

(temperature in S)

(b) What reading will be shown in S scale when he measures the temperature of an 

object at 60℃.

A hot filament radiates 1.50 W of light. The filament has a surface area of 0.250 mm2

and an emissivity of 0.950. what is the temperature (in kelvin) of the filament?

a car is traveling on a straight road at 19 m/s. the driver sees a bird standing in the road 38 meters ahead and applies the brakes, giving constant deceleration of 5 m/s^2.

how far away is the driver from the bird when he stops( assuming the bird doesn't move)

A solid sphere of mass 2.0 kg and radius 0.75 m about a diameter

A horse pulls a wagon with a force of 50 N at an angle of 37o with the horizontal and moves along at a speed of 6 km/hr. (a) How much work does the horse do in 10 minutes? (b) What is the power output of the horse?

Assuming that a 200 g body has a zero potential energy at ground level, what is its maximum potential energy when it is thrown vertically upward with a speed of

30 m/sec?

A solid disk of mass 5.0kg and a raduis of 0.50 m about a central axis?

-6e-3tcos(15t)nc