What does it mean when the line on a graph of a distance vs. time changes direction?

Answers

Answer 1

Answer: The slope of the line ... or the direction it's heading ... is the speed
of whatever is being graphed. So if the line changes direction, it
means that the speed changed at that time.

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20. There are two electrical devices, one is electrical kettle of 2KW-200V andnext one is electrical heater of 1KW-240 V. Which device has highest
resistance?

Answers

Electrical kettle:

P = 2 KW = 2000 W

U = 200 V

⇒ I = P/U = 2000 / 200 = 10 A

We apply the Law of Ohm:

R = U / I = 200V / 10A = 20 Ω

=======

Electrical heater:

P = 1 KW = 1000 W

U = 240 V

⇒ I = P/U = 1000 / 240 = 4,16 A

We apply the Law of Ohm:

R = U / I = 240V / 4,16A = 57,69 Ω

Answer:

The device with the highest resistance is the electric heater.

a student viewing a cell with a microscope observe a cell wall, a cell membrane,and a nucleus. The presence of these structures indicates that the student is looking at a cell from a

Answers

The answer should be Plant Cell

Find the density of an unknown liquid in a beaker. The empty beaker's mass is 165 grams. With the unknown liquid inside the beaker, the total mass is 309 grams. The
volume of the unknown liquid is 125mL. Is the liquid pure water? Explain your answer.

Answers

Density = mass / volume

So in order calculate the density of the unknown liquid, we need to know
its mass and its volume.

If the mass of the beaker is 165 grams empty and 309 grams with
something in it, then the mass of the stuff in it must be

(309 - 165) = 144 grams.

The question tells us that its volume is 125 mL (same as 125 cm³),
so we have everything we need.

Density = mass/volume = 144/125 = 1.152 grams per cm³ .

The density of pure water is 1.000 gram per cm³ , so the unknown liquid
is definitely not pure water.

The density of this unknown liquid is 15.2% more than that of pure water.
Even if water had a huge amount of pollution and junk in it, its density
would probably not be that much greater than 1.000 . So the unknown
liquid is probably not polluted water either.

Density is defined as mass divided by volume. SO we have to find the mass of unknown liquid first and then divide by its volume.

Mass of the liquid = total mass of beaker and liquid inside the beaker -
mass of empty beaker
= 309 grams - 165 grams
= 144 grams

volume of unknown liquid = 125 ml given

Density = mass / volume = 144 / 125 = 1.152 gm / ml

On earth’s surface, how much does a 100 kg mass weigh?

Answers

Weight = (mass) x (gravity)

Weight = (100kg) x (9.8 m/s^2)

Weight = 980 kg-m/s^2

Weight = 980 Newtons.

(about 220.5 pounds)

Final answer:

The weight of a 100 kg mass on Earth's surface is 980 Newtons(N). This is calculated using the formula 'w=mg', where 'w' is weight, 'm' is mass, and 'g' is the acceleration due to gravity on Earth (9.80 m/s²).

Explanation:

On earth, the weight of an object is determined by the gravitational force acting on it. This can be calculated using the formula w = mg, where 'w' is the weight of the object, 'm' is its mass, and 'g' is the acceleration due to gravity on Earth. Given that the mass 'm' is 100 kg and the acceleration due to gravity 'g' on Earth's surface is approximately 9.80 m/s², we can determine the weight of the object by substituting these values into the formula.

Applying these values into our equation, we get: w = (100 kg)(9.80 m/s²) = 980 N. Therefore, a 100 kg mass weighs 980 Newtons (N) on Earth's surface.

It is pertinent to note that an object's weight can vary based on its location as the value of 'g' changes with location. For instance, the value of 'g' on the moon is only about 1.67 m/s², which is far less compared to Earth, resulting in a lighter weight for the same mass.

Learn more about Weight on Earth here:

brainly.com/question/8900700

#SPJ3

Astronomy can best be described as a/an

Answers

as·tron·o·my- the branch of science that deals with celestial objects, space, and the physical universe as a whole. That's the definition hope it is what you need and that it helps:)

The study of heavenly bodies.

How that differs from astrophysics, astro dynamics, cosmology, etc., I'm not entirely sure.

A red apple is illuminated by green light. what color will the apple appear as?

Answers

The apple will be a sort of reddish or greenish brown.

the Apple will be a red/brown almost burgundy color

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