Other Physics Answers

A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?

At airport, a person is made to walk through a doorway of a metal detector, for security reasons. If he is carrying anything made of metal, the metal detector emits a sound. On what principle does the metal detector work?

Give the Trigonometric Functions and the value of x and y components

1. 30 degrees, West of South

2. 60 degrees North if West

Find the resultant vector using component method:

A = 20km, Eastward

B= 15km, 35 degrees North of West

FIVE FORCES ARE ACTING ON AN OBJECT: 1) F1 - 25 N EAST 2) F2 - 30 N 20 DEGREES NORTH OF WEST 3) F3 35 N 25 DEGREES SO0UTH OF WEST 4) F4 -  40 N SOUTH AND 5) F5 - 45 N 35 DEGREES SOUTH OF EAST FIND:

THE X AND Y COMPONENTS OF F1

Two charged concentric spheres have radii of 10cm and 18cm.the charge on the inner sphere is 6.0×10^8c and that on the outer sphere is 2.0×10^-8c.find the electric field at r=12cm

The speed of a projectile when it reaches its maximum height is 0.38 times its speed when it is at half its maximum height.What is the initial projection angle of the projectile?

Children playing in a playground on the flat roof of a city school lose their ball to the parking lot.One of the teachers kicks the ball back up to the children.The playground is 5.70m above the parking lot,and the school building's vertical wall is h=6.80m high, forming a 1.10m high railing around the playground.The ball is launched at an angle of 53.0° above the horizontal at a point d=24.0m from the base of the building wall.The ball takes 2.20s to reach a point vertically above the wall.

(a).Find the speed (in m/s) at which the ball was launched .

(b).Find the vertical distance (in m)by which the ball clears the wall.

(c).Find the horizontal distance (in m)from the wall to the point on the roof where the ball lands.

A rubber toy duck is at rest on an inclined plane.When the angle of inclination of the plane is increased to 35.4°C,the toy duck begins to slide down the incline.Then,when the angle is decreased to 29.8°C,the speed of the toy duck is constant.What are the coefficients of static and kinetic friction between the toy duck and the incline.

The four particles are connected by rigid rods of negligible mass where y1=5.90m.The origin is at the centre of the rectangle.The system rotates in the xy plane about the z axis with an angular speed of 6.60 rad/s.

(a). Calculate the moment of inertia of the system about the z axis.

(b). Calculate the rotational kinetic energy of the system.