PHYSICS MIDDLE SCHOOL

List four methods that can be used to separate mixtures and give an example of each method?

Answers

Answer 1
Answer: (1) Filtration - example is separating saltwater from sand particles.
(2) Distillation - example is apple cider vinegar. Distillation collects the liquid that we want, which is the vinegar and leave out other heavier suspended particles.
(3) Centrifuges - example is separating the blood components. They separate the plasma and erythrocytes.
(4) Magnetism - example is separating metals from non-metals in electromagnetic cranes, that differentiate between metal and heap of junks.

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Which substance is a combination of different atoms?

Answers

Answer:

Heterogeneous

Explanation:

A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded. A heterogeneous mixture is a mixture of two or more chemical substances where the various components can be visually distinguished.

Which option is a scientifically accurate description of velocity? A. The golf pro missed the shot even though the ball was only one meter away from the cup.
B.With just two second left on the clock, the basketball player moved quickly down the court to sink the ball in the basket.
C.The skier traveled downhill along the 80-meter track to the finish line in just 3.5 seconds to win the competition.
D. After traveling at 120 kph for the entire 30-minute race, the racecar driver ended the race at the same point she started.

Answers

Choice-C is the closest to being a description of velocity,
but I also have problems with 'C'. 

In order to describe velocity, you need a speed and its direction.

'A' doesn't state either one.

'B' says "quickly", which I don't accept as a speed, and "down the court",
which I don't accept as a direction. 

'D' nicely describes the speed ... 120 kph.  But the only thing it
tells us about direction is that it must have changed during the
race, because that's the only way the driver could have ended
the race in the same place she started it from.

'C' gives us the skier's speed ... (80 meters) / (3.5 sec)  =  22.86 m/s .
It also tells us that his direction was always downhill and along the track.
I would have preferred a better description of the direction, but I can
have it if I'm willing to go there and measure the direction of the track
and the slope of the hill.  So it's all there in this choice, but you have to
dig for it.

the answer is choice C i took the test and i got it right good luck

What is the meaning of heredity

Answers

heredity is the passing on of physical or mental characteristics genetically from one generation to another.

Newton's laws of motion

Answers

1) The purse falls to the ground because of Newton’s first law, an object in motion stays in motion and an object at rest will stay at rest until an unbalanced force changes it. The first law includes inertia, which occurs when the object wants to continue to go forwards even when it’s been stopped. When Jane stops her car, the purse wants to keep going forward, therefore falling to the ground.

2) when you’re standing on the board, the board pushes up on you, while you/gravity is pushing downwards // when you jump down, the opposite force pushes upwards, allowing you to go up (jump)

3) Newton’s second law, A=F/M

5) 19.5 newtons

Which of the following is an example of an organism maintaining homeostasis? A.
a boy riding a bike


B.
a cat grooming itself


C.
a bear nursing her cubs


D.
a man sweating while he runs

Answers

Homeostasis is generally maintained by an organism inside the body. Option D is the best example of the given statement.

How do organisms maintain homeostasis?

The state which maintains the physical, chemical and internal condition inside the body by the living system is called homeostasis. This is the condition at which an organism functioned optimally which includes body temperature and blood sugar.

In other words, homeostasis is the tendency of the body to monitor and maintain its internal states up to a stable level.

Option D states that "A man sweating while he runs". It means that when a man runs, his body itself maintains its temperature and the heat energy generated during the movement of the body is converted into a sweat. Thus the man started sweating while the body temperature increases.

Hence we can conclude that option D is an example of an organism maintaining homeostasis.

To know more about homeostasis follow the link given below.

brainly.com/question/9087319.
the answer is d because homeostasis is the bodys natural way of maintaining things

A driver drives 3 blocks North, 3 blocks east and 3 blocks south. What is the total displacement?​

Answers

The 3 blocks north and the 3 blocks south cancel each other, and contribute nothing to the displacement.  The total displacement is 3 blocks east.
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