Physics Answers

what is the relation between focal lenght and distance between screen and lenght in normal and myopic eye

If f is the force of gravity on any object of mass m, the gravitational field strength g is given by the following equation

Suppose a rocket is fired from the earth's surface of radius r, so that it just escapes from the gravitational influence of the earth with velocity v, then v is given by

The correct relationship between "G" and "g" in a gravitational field is given by the equation (where the symbols have their usual meanings)

The acceleration of free fall due to gravity in a certain location is 9.707ms calculate the gravitational attraction on a piece of cork of mass 50kg at this location

A particle of mass m is attached to the end of a string and moves in a circle of radius of r on a frictionless horizontal table. The string passes through a frictionless hole in the table and, initially, the other end id fixed.

a) if the string is pulled so that the radius of the circular orbit decreases, how does the angular velocity change if it is ω₀ when r = r₀?

b) what work is done when the particle is pulled slowly in from a radius r₀ to a radius r₀/2?

A force f̂ is expressed with respect to the basis ê₁ and ê₂ by equation 2(3 ê₁ +4 ê₂) N. If the directions of ê₁ makes an angle of 30 degree with f̂, find the vector ê₂.

Let the force of gravity be constant for small distances above the surface of the earth. A body is dropped from rest at a height h above the earth surface. What will be its kinetic energy just before it strikes the ground?

Next to a long straight wire on the amperage current I1 = 30A running through, people

install a square wire frame with current I2 = 2A. Frame and wire

straight in the same plane. The frame can rotate around a parallel axis

with the wire and go through the midpoints of two opposite sides of the frame. The shaft is rotating

one-piece conductor b = 30mm. Each frame edge has length a = 20mm. Find:

a. Force f exerts on the frame.

b. The tool is required to rotate the frame 180 ° around its axis.

An electron in a television lamp moves in front of the tube at high speed

8. 10 ^ 6 m / s along the x-axis as shown. Magnetic fields create in

The tube is fitted with an angle of 60 ° to the x-axis

(in the xy plane) and

value 0. 025T.

a) Calculate the applied magnetic force and the acceleration of the electron.

b) Find rotation period, orbital radius and spiral step.