Other Physics Answers

A futile task is proverbially said to be “like trying to empty the ocean

with a teaspoon.” Just how futile is such a task? Estimate the number of

teaspoonfuls of water in the Earth’s oceans.

And,

Estimate the time that might be taken to empty all oceans in the Earth. Give your answer with centuries and seconds.

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 elasticity of a matter.

b) Define stress and strain. Explain different types of stress and strain. 1+4

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 . 

Find the total energy of a moving object of mass 6.3 𝑘𝑔 and momentum

11.5 × 106 𝑘𝑔𝑚𝑠

−1

.

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 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. need to solution

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

How do Samsung use the concept of heat transfer in manufacturing phones to make them more faster and cheaper for the general public?

One section of a pipe is 2.5cm in diameter, horizontal, and 1m above ground level. This section is connected to a second horizontal section at ground level which is 5cm in diameter. In the elevated section, the velocity of flow of water is 2m/s and the pressure is 1.4×10sN/m². Calculate (a) the velocity of flow in the lower section (b) the pressure in the lower section,and (c) the rate of flow of water through the pipe in kilograms per seconds.