Physics Answers

An object falls from a high building and hits the ground in 9.0 seconds. Ignoring air resistance, what is the distance that it fell?

In an optical fiber system refractive index of the core is 1.52 and that of cladding is 1.48 find the critical angel of the system

An object of mass 6kg falls from a height of 90m above the ground. Calculate its total energy falling through 40m.

Light that is nonpolarized has an intensity of 6.0 W/m^2. Rays of this light are incident on two polarizing elements whose transmission axes are at an angle of 45°. What is the intensity of light emerging from the second film?

a. Given:

b. Formula:

c. Solution:

d. Final answer with unit:

Suppose a layer of oil (refractive index is 1.45) floats on water (refractive index is 1.33).If a ray of light shines onto the oil with an incidence angle of 40°, what is the angle formes between the ray and the surface of the water?

a) Given;

b)Formula:

c)Solution

d)Final answer with unit:

5

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When you take a bath, how many kilograms of cold water (10°C) must you mix with hot water

(50°C) so that the temperature of the bath is 35°C? The total mass of water is 180 kg. Ignore any

heat flow between the water and its surroundings.

What is the momentum of a vehicle if a force of 1000 N is applied on it in 0.50 seconds if it started from rest?

How long will it take to put a 4500 kg truck to rest from a velocity of 20.0 m/s if the force applied by the brakes is 5000N?

How much force is needed to put a 3000 kg vehicle to rest if initially moving at 16.67 m/s and if this force is to be applied on the vehicle for 30.0 seconds?

A 50 N force is used to push a 0.65 kg metal ball from rest. If the force is applied on the ball for 0.25 seconds, what will be its final velocity?