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3 years ago

If the magnets are brought close together, they will

2 answers:

7 0

It depends on which side. Opposites attract, so north and south would attract to each other and collide, while north and north or south and south would go away from eachother.

lisabon 2012 [21]3 years ago

5 0

opposites attract and if theyre the same they go away from eachother

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Light enters air from water. The angle of refraction will be A. less than the angle of incidence. B. greater than or equal to th

Rina8888 [55]

Answer:

E. greater than the angle of incidence.

Explanation:

Snell's law states that:

$n_i sin \theta_i = n_r sin \theta_r$ (1)

where

$n_i, n_r$ are the refractive index of the first and second medium

$\theta_i, \theta_r$ are the angle of incidence and refraction, respectively

For light moving from water to air, we have:

$n_i = 1.33$ (index of refraction of water)

$n_r = 1.00$ (index of refraction of air)

Substituting into (1) and re-arranging the equation, we get

$\sin \theta_r = \frac{n_i}{n_r} sin \theta_i = 1.33 sin \theta_i$

which means that

$\theta_r > \theta_i$

so, the correct answer is

E. greater than the angle of incidence.

4 0

3 years ago

Read 2 more answers

For a huge luxury liner to move with constant velocity, its engines need to supply a forward thrust of 6.85 105 N. What is the m

Leviafan [203]

Answer:

The magnitude of the resistive force exerted by the water is $6.85\times 10^{5}$ newtons.

Explanation:

By First and Second Newton's Law, the resistive force exerted by the water on the cruise ship has the same magnitude of forward thrust, with which it is antiparallel to. The equation of equilibrium for the luxury liner is:

$\Sigma F = F-R = 0$ (Eq. 1)

Where:

$F$ - Forward trust, measured in newtons.

$R$ - Resistive force exerted by the water, measured in newtons.

From (Eq. 1), we get that: ( $F = 6.85\times 10^{5}\,N$ )

$R = F$

$R = 6.85\times 10^{5}\,N$

The magnitude of the resistive force exerted by the water is $6.85\times 10^{5}$ newtons.

4 0

3 years ago

What affects a material’s resistance?

Keith_Richards [23]

Many things can affect a material's resistance, The type of material, how the material is being held (If its laying flat, being pulled, etc). What the material is used for, and how much material there is. Hope this helps!

8 0

3 years ago

Read 2 more answers

(a) What is the escape speed on a spherical asteroid whose radius is 545 km and whose gravitational acceleration at the surface

Keith_Richards [23]

Answer:

1777.92 m/s

Explanation:

R = Radius of asteroid = 545 km

M = Mass of planet

g = Acceleration due to gravity = 2.9 m/s²

G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²

Acceleration due to gravity is given by

$g=\dfrac{GM}{R^2}\\\Rightarrow M=\dfrac{gR^2}{G}$

The expression of escape velocity is given by

$v=\sqrt{\dfrac{2GM}{R}}\\\Rightarrow v=\sqrt{\dfrac{2G}{R}\dfrac{gR^2}{G}}\\\Rightarrow v=\sqrt{2gR}\\\Rightarrow v=\sqrt{2\times 2.9\times 545000}\\\Rightarrow v=1777.92\ m/s$