PHYSICS MIDDLE SCHOOL

What happens to the density of ocean water when salinity increases? A. It increases. B. It decreases. C. It becomes variable. D. It doesn't change.

Answers

Answer 1

Answer: A. It increases... but slightly. Good luck!

Answer 2

Answer:

Answer:

Explanation:

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A cylindrical rod of mass M. length L and radius R has two cords wound around it whose ends are ato the ceiling as shown. The rod is held horizontally with the two cords vertical. When the rod s mecasecords unwind the rod rotates. Find the tension in the cords as they unwind.

31 POINTS COME AN GET IT PPL!If a satellite or spaceship explodes in outer space, you can see the explosion from a distance but you cannot hear it. Why?

A)
Light waves travel very fast and sound waves travel much slower.

B)
Sound waves transmit energy while light does not transmit energy.

C)
Sound is a mechanical wave and needs a medium to travel through while light is an electromagnetic wave.

D)
Light is a mechanical wave and needs a medium to travel through while sound is an electromagnetic wave

Answers

The answer is A.

Light waves travel faster than sound waves. This is also why lightning is always seen before thunder is heard.

Explain why the phrase "by ordinary means" was added to the Law of Conservation of Energy

Answers

The phrase "by ordinary means" was added to the Law of Conservation of Energy because kind to be expected in the normal order of events.

What is mean byLaw of Conservation of Energy and who proposed it?

Law of Conservation of Energy law, first proposed and tested by Émilie du Châtelet, means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another. For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes
The conservation of energy formula goes Ki+Ui=Kf+Uf. U is potential energy and K is kinetic energy..

The laws of conservation of energy, momentum, and angular momentum are all derived from classical mechanics.

The phrase "by ordinary means" was added The phrase "by ordinary means" was added.

To learn more about laws of conservation of energy refer:brainly.com/question/11911812

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-it can only be converted from one form to another.

When an object moves, stops moving, changes speed, or changes direction, how do scientists describe that condition?

Answers

Drop "moves" from the list for a moment.

You can also drop "stops moving", because that's included in "changes speed"
(from something to zero).

When an object changes speed or changes direction, that's called "acceleration".

I dropped the first one from the list, because an object can be moving,
and as long as it's speed is constant and it's moving in a straight line,
there's no acceleration.

I think you meant to say "starts moving". That's a change of speed (from zero
to something), so it's also acceleration.

A ball is moving at 7.0 m/s and has a momentum of 100kg.m/s. What is the balls mass?

Answers

Answer:

14 kg

Explanation:

Momentum = mass × velocity

p = mv

100 kg m/s = m (7.0 m/s)

m ≈ 14 kg

Diamond will scratch quartz. True or False

Answers

false
hope this helps

Answer:true, diamonds will scratch quartz.

Explanation: diamonds have a more compact composition. That is what makes them so hard. Quartz composition is not that compact, so diamond can scratch it.

Particle q1 has a positive 6 µC charge. Particle q2 has a positive 2 µC charge. They are located 0.1 meters apart. What is the force applied between q1 and q2?

Answers

Answer:

F=10.8N

Explanation:

In the picture above.

Hope this helps.

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