Weight = mass x gravitational field strength

A sprinter is advised to reduced his speed slowly after completing his race.why

VARVARA [1.3K]

<span>The sprinter is advised to reduce his speed slowly after completing the race because of the power that is needed when the stoppage is down in a faster manner could be very great. This would translate to the great usage in gasoline. Also, the inertia of the vehicle is quiet high so it is hard to stop it very suddenly. </span>

5 0

3 years ago

If we assume that the metallic plates are perfect conductors, the electric field in their interiors must vanish. given that the

Svetlanka [38]

here the charge density of metal plate is given as

$charge density = \sigma$

now the electric field is given Gauss law

$\int E. dA = \frac{q}{\epsilon_0}$

now here E = constant

so we will have

$E. \int dA = \frac{q}{\epsilon_0}$

Since total area on both sides of plate will be double and becomes 2A

$E. 2A = \frac{q}{\epsilon_0}$

$E = \frac{q/A}{2\epsilon_0}$

$E = \frac{\sigma}{2\epsilon_0}$

Now if we will find the electric field inside the metal plate

Then as we know that total charge inside the plate will always be zero

so we have

$E = 0$

7 0

3 years ago

Explain the advantages of using parallel circuits to series circuits in wiring rooms

irina [24]

The major advantage of parallel circuit which makes it advantageous in the application of wiring rooms are the supply of equal voltage across each circuit, which is not present in series circuit.

<u> Explanation:</u>

The use of parallel circuit is preferred over series circuit while wiring the room as the parallel gives the same voltage across every circuit which keeps it safe from damaging or burning as they give consistent voltage.

Apart from this, the parallel circuit allows you for independent operation without letting use of all the equipment present in the room. Then there is scope for additional components without changing the voltage.

5 0

3 years ago

A ball is thrown straight up into the air with a velocity of 12 m/s. Draw a motion diagram for the ball and then give as much qu

viktelen [127]

Answer:

find the diagram in the attachment.

Explanation:

Let vi = 12 m/s be the intial velocy when the ball is thrown, Δy be the displacement of the ball to a point where it starts returning down, g = 9.8 m/s^2 be the balls acceleration due to gravity.

considering the motion when the ball thrown straight up, we know that the ball will come to a stop and return downwards, so:

(vf)^2 = (vi)^2 + 2×g×Δy

vf = 0 m/s, at the highest point in the upward motion, then:

0 = (vi)^2 + 2×g×Δy

-(vi)^2 = 2×g×Δy

Δy = [-(vi)^2]/2×g

Δy = [-(-12)^2]/(2×9.8)

Δy = - 7.35 m

then from the highest point in the straight up motion, the ball will go back down and attain the speed of 12 m/s at the same level as it was first thrown