Other Physics Answers

(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) 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?

(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

You throw a ball with a mass of 0.40 kg against a brick wall. It hits the wall moving horizontally to the left at -30m/s and rebounds horizontally to the right at 20m/s. Find the impulse of the net force on the ball during its collision with the wall.

a) Define viscosity.

b) A matter has a body-centered cubic unit cell with a length of 330 𝑝𝑚 along an edge and a density of 8.57 𝑔 𝑐𝑚−3 . Calculate the atomic mass of the matter.

c) Find the total energy of a moving object of mass 6.3 𝑘𝑔 and momentum 11.5 × 106 𝑘𝑔𝑚𝑠 −1 .

a) Define the elastic modulus. Explain the different types of elastic modulus.

b) State and explain Einstein's Photoelectric Effect theory.

c) If 12𝑁 force is applied to a fluid of cross-section 5.34 𝑐𝑚2 with a shearing rate of 0.7 𝑠 −1 then find the viscosity of the fluid. 

a) Define crystal and unit cell

b) Explain de Broglie wave and the photoelectric effect.

c) A wire of length 7 𝑚 and radius 2.37 𝑚𝑚 is stretched by a load of 12370 𝑔𝑚 and increased by 1.78% of the original length. Find the stress, strain, and Young’s modulus of the material of the wire. 

a) Define the surface tension and surface energy.

b) Explain the elastic limit with an example. Draw the stress-strain curve for elasticity.

c) A capillary tube with an inside radius of 638 𝑛𝑚 can support a 100 𝑚𝑚 column of liquid that has a density of 820 𝑘𝑔𝑚−3 . The observed contact angle is 12.5°. Find the surface tension of the liquid for ℎ = 20 𝑐𝑚.

1. a) Define elasticity of a matter.

b) Define stress and strain. Explain different types of stress and strain.

c) The radius of a silver bar is 30 𝑐𝑚. What force is required to stretch the bar by 12.7% of its length where Young’s modulus is 𝑌 = 7.25 × 1010 𝑁𝑚−2 .