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3 years ago

What is a chunk of rock or dust from space

Physics

2 answers:

Readme [11.4K]3 years ago

8 0

It's either a comet or asteriod

bulgar [2K]3 years ago

8 0

If it's small and doesn't cause anybody any trouble, it's a meteor.
Thousands of those fall to Earth every day. Maybe millions.
If it happens at night and you happen to be looking in the sky,
you see a "shooting star".

If it's big enough, it would be called an asteroid. None of those
have fallen to Earth for millions of years. If one did, it would be
a giant headache for everybody on Earth. An asteroid more than
a few miles across could could easily wipe out all life on Earth.

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Practice physics chapter 3 grade 11 test

Ugo [173]

Board??? what you want??

6 0

4 years ago

A coin is resting on the bottom of an empty container. The container is then filled to the brim three times, each time with a di

Virty [35]

Answer:

Refractive index of liquid C > Refractive index of liquid B > Refractive index of liquid A

Explanation:

Let the depth of each section is h.

That means the real depth for each section is h.

Apparent depth is liquid A is 7 cm.

Apparent depth in liquid B is 6 cm.

Apparent depth in liquid C is 5 cm.

by the formula of the refractive index

n = real depth / apparent depth

where, n is the refractive index of the liquid.

For liquid A:

$n_{A}=\frac{h}{7}$ .... (1)

For liquid B:

$n_{B}=\frac{h}{6}$ ..... (2)

For liquid C:

$n_{C}=\frac{h}{5}$ ..... (3)

By comparing all the three equations

nc > nB > nA

Refractive index of liquid C > Refractive index of liquid B > Refractive index of liquid A

5 0

3 years ago

What is the velocity of a car that traveled a total of 75 kilometers north in 1.5 hours?

Tomtit [17]

Answer:

50km/hr is the velocity of a car that traveled a total of 75 km North in 1.5 hours.

7 0

3 years ago

The closely packed cones in the fovea of the eye have a diameter of about 2 Î¼m. For the eye to discern two images on the fovea

Marina CMI [18]

Answer:

The distance between the object is $l=0.0056\ cm$

Explanation:

The free body diagram of this setup is on the first uploaded image

From the question

The diameter of closely packed cones in the fovea of the eye is = $2 \mu m$

The distance of separation by one cone(not excited ) is $d = 4\mu m = 4*10^{-4}cm$

The distance between the two point-like object is l

The diameter of the eye is D = 2 cm

The distance of the two point-like object from the near point of the eye is A = 28 cm

From the diagram we see that the light from the two point-like object form a triangle of similar base l and d and height D and A

So for a triangle with similar base we have that

$\frac{l}{A} =\frac{d}{D}$

$\frac{l}{28} = \frac{4*10^{-4}}{2}$

making l the subject we have

$l = \frac{28 *4*10^{-4}}{2}$

$l=0.0056\ cm$

5 0

3 years ago

Read 2 more answers

Release an electron initially at rest in the presence of an electric field. The electron tends to go to the region of 1. same el

olga nikolaevna [1]

Answer:

The electron tends to go to the region of 4. higher electric potential.

Explanation:

When a charged particle is immersed in an electric field, it experiences a force given by

$F=qE$

where

q is the charge of the particle

E is the electric field

The direction of the force depends on the sign of the charge. In particular:

- The force and the electric field have the same direction if the charge is positive

- The force and the electric field have opposite directions if the charge is negative

Therefore, an electron (negative charge) moves in the direction opposite to the electric field lines.

However, electric field lines go from points at higher potential to points at lower potential: so, electrons move from regions at lower potential to regions of higher potential.

Therefore, the correct answer is

The electron tends to go to the region of 4. higher electric potential.

4 0

4 years ago