Observations show that interstellar clouds can have almost any shape and, if they are rotating at all, their rotation is not perceptible. however, as shown in the video, the nebular theory predicts that a cloud will rotate rapidly once it shrinks to a small size. what physical law explains why a cloud will rotate rapidly as it collapses?

Answers

Answer 1

Answer: The law of conservation of angular momentum holds because the cloud is collapsing only due to gravity.Because angular momentum is proportional to velocity times radius, keeping this product constant requires that the velocity of rotation increase when the cloud radius decreases. Hope it helps.

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I need to explain how objects can have the same volume but different mass. Help??

Answers

No problem, and you already know all about it.

Here are a few examples of same volume / different weight:

-- A bottle full of water is heavier than the same bottle when it's full of air.
-- Stones are heavier than styrofoam chunks the same size.
-- A bowl of meat loaf is heavier than a bowl of scrambled eggs.

In each example, two things have the same volume, but one weighs more than
the other. I didn't say anything about mass yet, but that's easy: As long as you
keep everything on Earth, more weight means more mass.

So how come, in each example, things with the same volume have different mass ?
This was your original question.

The answer is just the simple fact that there are millions of different substances, and
each different substance packs a different amount of mass into the same volume.

The amount of mass that a substance packs into a standard volume is called
the density of the substance. Meat loaf is more dense than scrambled eggs.
Stone is more dense than styrofoam. Water is more dense than air. And gold
is 19 times as dense as water. If you have a jar that holds a pound of water, and
you pour out the water and fill the jar with gold, the same jar holds 19 pounds of gold,
because the density of gold is 19 times the density of water.

The reason you were assigned to think about this question for homework is that
next time your Physics class meets, you'll start talking about Density. And you're
all ready for it now.

If you ride an elevator moving forward with a constant speed, is your apparent weight same,greater than or less than your weight?

Answers

If the elevator's speed is constant (in ANY direction) and you can't see out of it, then there's NO measurement you can make inside that will tell you that it's moving. Any weight you measure is normal.

Is a marble rolling across the table kinetic energy

Answers

Not exactly. A marble rolling across the table is a marble,
and it has mass, weight, momentum, and kinetic energy.

Which component measures the potential difference across a branch in a circuit? A.switch. B.resistor. C.ammeter. D.voltmeter.

Answers

Answer: The correct answer is option (D).

Explanation:

Voltmeter is a device which measures the the voltage applied across the circuit. It is an electrical instrument used to measure the electric potential between the two points in an electric circuit.

Where as:

A switch is the device which used to connect or disconnect the circuit.

Resistor is a device which opposes the flow of current is an electric circuit.

An ammeter the is an electrical device which measures the amount of current in flowing in amperes in an electrical circuit

Hence,the correct answer is option (D).

(D)Voltmeter measures the potential difference

If the pitch of the sound coming out from a speaker increases, which is true about the sound wave?

Answers

If the pitch of a sound increases, then we know that its frequency
has increased, and its wavelength has decreased.

Answer:

Explanation:

Because If the pitch of a sound increases, then we know that its frequency

has increased, and its wavelength has decreased.

39WERELAIS
01:21:51
Which type of reaction is C2H2011 - 12C + 11H202
O synthesis
decomposition
O oxidation
combustion

Answers

Answer:

Explanation:

synthesis decompostion

Answer:

Decompositon

Explanation:

Other Questions

A source of voltage produces an electric current by

In a given circuit, the supplied voltage is 1.5 volts. One resistor is 3 ohms and the other is 2 ohms. Use Ohm's law to determine the current in the circuit. 0.3 amps 1.5 amps 7.5 amps 3.3 amps The purpose of a fuse or circuit breaker is _____. to speed up the current to slow down the current to stop current that is flowing too fast to stop current that is flowing too slow

Select all of the answers that apply.Thermohaline circulation is driven by _____. density salinity temperature wind Coriolis effect