Physics Answers

It is found that the resistance of a coil of wire increases from 40 ohm at 15°C to 50 ohm at 60°C. Calculate the resistance temperature coefficient at 0°C of the conductor material.

. (a) Define the interference and diffraction of light.

(b) Write down the difference between the interference and diffraction of light?

(c) Derive an equation for interference of light for bright and dark fringes.

Define the simple harmonic motion (SHM).

(b) Write down the difference between Periodic and SHM?

(c) Derive the differential equation of SHM. A body is in simple harmonic motion is

having an amplitude of 5 cm and a period of 0.2 s. Calculate the acceleration and

the velocity of the body when the displacement is (a) 5 cm (b) 3 cm (c) 0 cm.

Define the dry friction.

(b) Explain the fluid and solid friction with suitable diagrams. A 500 lb box is sitting

on concrete floor. If the static coefficient of friction is 0.7 and the kinetic

coefficient of friction is 0.6. What is the minimum force required to keep the box

moving once it has started moving?

(c) What is the physical significance of dry friction graph?

(a) Define friction.

(b) Explain the static and kinetic friction with suitable diagrams. A large block of ice

is being pulled across a frozen lake. The block of ice has a mass of 250 kg. The

coefficient of friction between two ice surfaces is small: μk = 0.05. What is the

force of friction that is acting on the block of ice?

(c) Why friction is importance in terms of physics and engineering studies.

(a) What is an example of the first law of thermodynamics? 5.0-g bullet traveling at a

speed of 300 m/s enters a tree and exits the other side with a speed of 150 m/s.

Where did the bullet’s lost kinetic energy go, and how much energy was

transferred?

(b) What is the application of thermodynamics in engineering studies?

In an experiment to determine the thermal conductivity of a bar of new alloy, one end of the bar is maintained at 0 °C and the other end at 100 °C. The bar has a cross-sectional area of 1.0 cm2 and a length of 15 cm. If the rate of heat conduction through the bar is

34 W, what is the thermal conductivity of the bar?

(a) Define the force.

(b) Explain the different types of force with appropriate diagrams.

(c) Explain the Newton’s law of motion-review. A 20 kg block and a 15 kg block are

hanging on opposite sides of a pulley (see picture). Assuming a frictionless,

massless pulley, determine the acceleration of the blocks once they are released

from res

Simplification theorems (Boolean)

1. X+XY=X

2.X(X+Y)=X

3.(X+Y')Y=XY

Find the complements of 

[(A'+B)C']' =?

[(AB'+C)D'+E']' =?

[A+((BC')'+D)]" =?