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4 years ago

A magnetic field would be produced by a beam of

1 answer:

7 0

<span>A magnetic field would be produced by a beam of (3) protons.
Although you could easily make a case for any of these four options (the question is pretty ambiguous), there can be only one correct answer, which is the third option, in this case.
</span>

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A plane starting from rest accelerates to 40 m/s in 10 s. How far did the plane travel during this time?

andrew-mc [135]

Answer:

400 meters

Explanation:

using the equation:

speed = distance/time
it would look like this when plugged in: 40=d/10
d (distance) is the unknown variable, so you have to solve for that
multiply both sides by 10 since you want to separate d to solve its number.
10d/10=40 × 10
the two tens on the d part of the equation would cancel out, leaving only d.
Therefore, d = 400

Hopefully this helps.

5 0

3 years ago

Is The force of friction always opposite to the motion?

Taya2010 [7]

Answer:

Friction force always acts tangent to the surface at points of contact. Friction force acts opposite to the direction of motion.

Explanation:

8 0

4 years ago

The plates of a parallel-plate capacitor have constant charges of +Q and?Q. Do the following quantities increase, decrease, or r

sveticcg [70]

Explanation:

(A) Electric field for the parallel plate capacitor is given by :

$E=\dfrac{\sigma}{2\epsilon_o}$

It is clear that the electric field does not depend on the separation of the plates.

(B) The relation between the electric field and the electric potential is given by :

$V=Ed$

d is the separation between plates. So, if the separation of the plates is increased, the potential difference increases.

(C) The capacitance of the parallel plate capacitor is given by :

$C=\dfrac{A\epsilon_o}{d}$

So, the capacitance decreases when the separation of the plates is increased.

(D) The energy stored in the capacitor is given by :

$E=\dfrac{1}{2}CV^2$

$E=\dfrac{1}{2}C(Ed)^2$

So, the energy stored in the capacitor is increased when the separation of the plates is increased.

8 0

3 years ago

Read 2 more answers

Which describes the molecular motion of a solid nickel marble rolled across the floor?

Gemiola [76]

I can't decide between A and B, but B seems more likely to me. Even though the molecules don't look like they're moving, the area of contact is slightly more compressed.

7 0

4 years ago

When an RL circuit is connected to a battery, which is true about its initial and final states?

zubka84 [21]

Answer:A

Explanation:

In R-L circuit current is given by

$i=i_0\left [ 1-e^{\frac{-t}{L/R}}\right ]$