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Rzqust [24]
4 years ago
15

Compass needle normally points toward Earth's magnetic pole, which is near the North Pole. Which best explains why the

Physics
1 answer:
swat324 years ago
5 0

Answer:

compass needle normally points toward Earth's magnetic pole, which is near the North Pole. Which best explains why the

eedle moves away from the pole when it comes close to a current-carrying wire?

Current within the wire weakens the magnetic force of the pole.

Magnetism surrounding the wire weakens the magnetic force of the nole

Explanation:

You might be interested in
When the Moon is in the position shown, how would the Moon look from Earth?
Vlad [161]

Answer:When the Moon is in the position shown below, how would the Moon look to an observer on the North Pole? The moon's rotational period is equal to its revolutional period around Earth. This statement is false because at night we see one side and during the day we see the opposite.

Explanation:

8 0
3 years ago
1. A record with a radius of 0.3m spins in a clockwise circle with a centripetal
Hitman42 [59]

Solve for the linear/tangential speed:

<em>a</em> = <em>v</em>²/<em>r</em>

where <em>a</em> = centripetal acceleration, <em>v</em> = speed, and <em>r</em> = radius.

4.7 m/s² = <em>v</em>²/(0.3 m)

<em>v</em>² = (0.3 m) (4.7 m/s²)

<em>v</em> ≈ 3.96 m/s

For every time the record completes one revolution, a fixed point on the edge of the record travels a distance equal to its circumference, which is 2<em>π</em> (0.3 m) ≈ 1.88 m. So if 1 rev ≈ 1.88 m, then the angular speed of the record is

(3.96 m/s) (1/1.88 rev/m) ≈ 7.46 rev/s

Take the reciprocal of this to get the period:

1 / (7.46 rev/s) ≈ 0.134 s/rev

So it takes the record about 0.134 seconds to complete one revolution.

6 0
3 years ago
A thin flake of mica ( n = 1.58 ) is used to cover one slit ofa double slit interference arrangement. The central point on thevi
ELEN [110]

Answer:

the thickness of the mica is 6.64μm

Explanation:

By definition we know that the phase between two light waves that are traveling on different materials (in this case also two) is given by the equation

\Phi = 2\pi(\frac{L}{\lambda}(n_1-n_2))

Where

L = Thickness

n = Index of refraction of each material

\lambda = Wavelength

Our values are given as

\Phi = 7(2\pi)L=tn_1 = 1.58n_2 = 1\lambda = 550nm

Replacing our values at the previous equation we have

\Phi = 2\pi(\frac{L}{\lambda}(n_1-n_2))7(2\pi) = 2\pi(\frac{t}{\lambda}(1.58-1))

t = \frac{7*550}{1.58-1}\\t = 6637.931nm \approx 6.64\mu m

the thickness of the mica is 6.64μm

5 0
3 years ago
An ideal refrigerator does 240 J of work to remove 610 J as heat from its cold compartment. (a) What is the refrigerator's coeff
Anastaziya [24]

Explanation:

It is given that,

Work done, W = 240 J

Heat removed, Q = 610 J

(a) The refrigerator's coefficient of performance is given by :

COF=\dfrac{Q}{W}

COF=\dfrac{610}{240}

COF = 2.54

(b) Let Q' is the heat per cycle is exhausted to the kitchen. It is given by :

Q' = Q + W

Q' = 610 + 240

Q' = 850 J

Hence, this is the required solution.

4 0
4 years ago
**URGENT PLEASE HELP**
nalin [4]

Answer:

This depends on what angle they are approaching each other before they collided.The two simple cases are if they are running in the same direction or opposite direction from each other. For either case, use the conservation of momentum equation to solve: M_total*V_result = M1*V1 + M2*V2

Explanation:

Here are two possible solutions.

Head-on collision: M1=78, V1=8.5, M2=72, V2=-7.5 (that's negative because he's running the other way), M_total = 78+72 = 150, so V_result = (78*8.5 - 72*7.5)/150 = 0.82 m/s. Sanity check, they weigh about the same and so most of their velocity should cancel out.

Running the same way: change the sign of V2 to positive so V_result = (78*8.5 + 72*7.5)/150 = 8.02 m/s. Sanity check, they weigh about the same and the resultant speed is between the two starting velocities.

<em>hope it helps:)</em>

7 0
4 years ago
Read 2 more answers
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