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11Alexandr11 [23.1K]
3 years ago
9

HELPPPP MEEEEEEEEEEE Work = force × distance (W = Fd) In which scenario is the most work done?

Physics
1 answer:
Ket [755]3 years ago
3 0

Answer:

A parrot lifts a cracker off the ground to eat.

Explanation:

Work is said to be done by a force only if the force causes displacement.

Work (W) by a force (F) causing a displacement (d) is given as:

W=Fd

Displacement of an object is the net change in its position and a body that is not moving has zero displacement.

Let us check each option now.

Choice 1:

A parrot lifts a cracker off the ground to eat.

Here, the lifts a cracker off the ground. So, the parrot applies some force on the cracker and the cracker's position has changed.

So, there is work done by the parrot as force causes a displacement.

Choice 2:

A weightlifter holds a 150 pound barbell for 3 minutes.

Here, no work is done as the force applied to hold the barbell is not producing any displacement.

Choice 3:

A waiter holds a tray of 15 glasses of water over his head while standing at the front of a restaurant.

Here, no work is done as the force applied to hold the glasses of water is not producing any displacement.

Choice 4:

A truck motor runs for 24 hours while the truck is parked.

Here, no work is done as the force applied to run the motor is not producing any displacement (truck is parked).

So, the correct choice is first choice.

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A source charge generates an electric field of 4286 N/C at a distance of 2. 5 m. What is the magnitude of the source charge? (Us
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The magnitude of the source charge is 3 μC which generates 4286 N/C of the electric field. Option B is correct.

What does Gauss Law state?

It states that the electric flux across any closed surface is directly proportional to the net electric charge enclosed by the surface.

Q = \dfrac {ER^2}k

Where,

E = electric force = 4286 N/C

k = Coulomb constant = 8.99 \times  10^9 \rm\ N m ^2 /C ^2

Q\\
     = charges = ?

r = distance of separation = 2.5 m

Put the values in the formula,

Q  = \dfrac {4286\times  2.5 ^2}{8.99 \times  10^9 }\\\\
Q  = 3\rm \  \mu C

Therefore, the magnitude of the source charge is 3 μC.

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