A ball is kicked at an angle of 35° with the ground. a) What should be the initial velocity of the ball so that it hits a target that is 30 meters away at a height of 1.8 meters?b) What is the time for the ball to reach the target?

a.18.5 m/s

b.1.98 s

Explanation:

We are given that

a.Let be the initial velocity of the ball.

Distance,x=30 m

Height,h=1.8 m

Substitute the values

Initial velocity of the ball=18.5 m/s

b.Substitute the value then we get

t=1.98 s

Hence, the time for the ball to reach the target=1.98 s

a=d/t

a="triangle"v/t

explanation:

a = acceleration

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia