PHYSICS MIDDLE SCHOOL

Some constellations, such as Ursa Minor, are visible in the sky year-round; other constellations appear for only part of the year. Explain why this happens.

Answers

Answer 1
Answer:

Answer:

As the Earth revolves about the sun, different sky is visible during time of the year. We have winter constellations and summer constellations. But some constellations appear through out the year like Ursa Minor are the ones which lie close to the poles. The Earth rotates about the axis passing through North and south pole. The axis always points towards North. Thus, the constellations near the Poles would be visible throughout the year.

Answer 2
Answer: Some stars follow our orbit, and some stay in the same position forever.

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Carla pushes a toy car and lets it go. The toy car rolls and gradually comes to a stop. What would make the car stop?A. A force must be applied to the car in the direction opposite to that in which it is moving.B. A force must be applied pushing the car forward in the same direction as the moving car.C. A force must be applied in a direction pushing the car upward to make the car stop.D. A force must be applied in a direction pulling the car downward causing the car to stop.
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Water changes shape to fill the shape of its container. what is the best explanation for this ?

Answers

The answer would be that it is a liquid. It does not have a definite shape. That is why is takes the shape of what ever container it fits into. 
Liquids don't have a definite shape so that means it does not take shape of its contaner but, solids do for example when you put water in a bown and freeze it up then it will stay there. Hope i helped :D

What object circles around a planet

Answers

A object that circles around a planet is called a satellite.
an object that circles around a planet is a satellite. earth's satellite is the moon.

How did the scientists discover the common structure of cells

Answers

i did some research and i found that: through use of a microscope. The first scientists to look at  human tissues through a microscope were surprised to see that all human tissues are made up of little compartments. They called these 'cells' after the bedrooms of monks in monasteries 

What is the formula of iron(III) oxide?

Answers

Answer:

Fe2O3

hope this helps

A 4.0 kg bucket of water is raised from a wellby a rope.
The acceleration of gravity is 9.81 m/s?.
If the upward acceleration of the bucket is
2.8 m/s², find the force exerted by the rope
on the bucket of water.
1. 69.658
2. 52.84
3. 85.318
4. 70.86
5. 84.429

Answers

Explanation:

Draw a free body diagram of the bucket.  There are two forces:

Tension force T pulling up.

Weight force mg pulling down.

Sum of forces in the y direction:

∑F = ma

T − mg = ma

T = mg + ma

T = m (g + a)

Given m = 4.0 kg, g = 9.81 m/s², and a = 2.8 m/s²:

T = (4.0 kg) (9.81 m/s² + 2.8 m/s²)

T = 50.44 N

If an object is accelerating to the right , then net force on the object must be directed towards the right ! True Or False ?

Answers

Not so fast.

I think you're using 'accelerating' to mean 'speeding up', but you really need
to be more careful with it. "Acceleration" means ANY change in speed OR
direction.

If an object's speed to the left is decreasing, or its speed to the right is
increasing, then the net force on the object must be directed towards
the right.

If an object is moving with constant speed in a circular path, then it's
constantly accelerating, because its direction is constantly changing.
The force on it is always directed towards the center of the circle, so
there's one point on the path where the force is directed straight to the right.
This is correct. Just think about it. If you push an object to the right then it will accelerate to the right.
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