Physics Answers

What is the apparatus use to show that water is a poor conductor of heat

Part of a steel tape used by a surveyor is 20m at 12°c.what is the overall length measured by using this part of the tape one hundred times on a warmer day corresponding to 22°c(linear expansivity of steel =1.1×10^-5k-1

A train moves from an observer standing on a platform with a velocity of 10m/s. The siren emitted by the Train has a frequency of 50Hz.

A. What is the frequency of the sound heard by the observer?

B. What is the frequency of the sound heard by the observer in the Train?

(SPEED OF SOUND = 330 PER SECONDS)

A source of sound moves towards a stationary observer with a speed of ⅓ that of sound. If the frequency of the sound from the source is 100Hz, what is the apparent frequency of the sound heard by the observer

Given a resistor R1= 20ohms, R2= 20ohms, R3= 30ohms are connected in parallel. The next one is connected in series to obtain a total resistance of 10ohms. If P= 0.36KW, Find the Current

In a nucleus, two protons are 10^-15 m apart. a) What is their electrical potential energy? b) Knowing that they start from rest and are free to move, find their velocity when they are 4x10^-15 m apart.

Consider a thermodynamics system consisting of 3 mol of an ideal gas occupying 0.03 m^3 volume at 300k temp. Determine its initial pressure. For this gas ,Y=1.4. It undegoes the following processes:

1.) It is compressed to 0.01 m^3 volume isothermally. Determine the pressure of the gas.

2.) Then it is allowed to expand adibatically, till it attains 1 atm pressure. Determine the final volume.(1atm=101325Nm^-2)

Draw a labelled indicator diagram of these processes.

Two point electric charges q2 = 5q1 and q1 are at a distance of 3 meters and apply a repulsive force of 0.02 N to each other, and how many microclones?

Describe in your own words what isotopes are.

Determine the equivalent total resistance for each of the following circuits below

7

5

2