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3 years ago

Please help pleeeeeeaaaassseeee help

Physics

2 answers:

Andreyy893 years ago

6 0

Answer:

electrons

Explanation:

plzzzzzzz Mark my answer in brainlist

Nata [24]3 years ago

5 0

During rubbing, $^E^L^E^C^T^R^O^N^S$ are transferred between the woolen cloth and the balloon.

Hope this helps!

$GraceRosalia$ here to help

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The force per meter between the two wires of a jumper cable being used to start a stalled car is 0.244 N/m. (a) What is the curr

MakcuM [25]

Answer: current I is 144amp(A)

Explanation: The force per lenght F/L, current l, and separation distance r are related by the formula

F/L = permeability of space* I²/2*pi*r

Permeability of free space is 1.257*EXP {-6} Henry/meter

F/L is 0.244 N/m, pi is 3.142,

r is 1.7cm which is equal to 0.017meter.

I is what we are looking for.

Now we have after substitution,

0.244

= 1.257*EXP {-6} * I²/(2*3.142*0.017)

After cross multiplying and making I² subject of formula we have,

0.0261/(1.257*EXP {-6}) = I²

I = √{20736.7} =144ampere(A)

That means in each of the jumper wire there is 144amp(A)

8 0

3 years ago

What is the term for the circular movement of material inside Earth's mantle?

Gala2k [10]

Answer:

convection currents is the answer

5 0

3 years ago

A skydiver has reached terminal velocity—she now falls at a constant speed, so her acceleration is zero. Is there a net force on

Taya2010 [7]

Answer:

No, the net force on the skydiver is zero

Explanation:

According to Newton's Second Law, the net force on an object is equal to the product between the mass of the object and its acceleration:

$F=ma$

where

F is the net force

m is the mass of the object

a is the acceleration

In this problem, the acceleration of the skydiver is zero:

a = 0

This implies that also the net force on the skydiver is zero, according to the previous equation:

F = 0

So, the net force on the skydiver is zero. This occurs because the air resistance, which points upward, exactly balances the force of gravity on the skydiver, acting downwards.

6 0

4 years ago

A ball is dropped from the top of a 77 m building. With what speed does the ball hit the ground? _________ m/s

vitfil [10]

Answer:

38.87 m/s

Explanation:

Given that the ball is dropped from a height = 77 m

u = 0 m/s

s = 77 m

a = g = 9.81 m/s²

Applying the expression as:

$v^2-u^2=2as$

Applying values as:

$v^2-u^2=2as\\\Rightarrow v=\sqrt{2as+u^2}\\\Rightarrow v=\sqrt{2\times 9.81\times 77+0^2}\\\Rightarrow v=38.87\ m/s$

<u>The speed with which the ball hit the ground = 38.87 m/s</u>

3 0

3 years ago

According to Lenz's law, the current is induced in the closed conducting loop in such a direction that the magnetic field induce

VLD [36.1K]

Answer:

True

Explanation:

It is true that the real definition of lenz's law in magnetism is the current is induced in the closed conducting loop in such a direction that the magnetic field induced by this current opposes the change in the flux through the loop.

This means that induced current opposes the very cause that produces it.

4 0

3 years ago