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3 years ago

What 2 rules do scientists use to determine if something is a planet.

2 answers:

5 0

Answer: one of the things that determinates something is a planet and not a star is that planets are constanlty moving around the sun while stars are "still"

Explanation:

velikii [3]3 years ago

3 0

Answer:

1. It must orbit a star (in our cosmic neighborhood, the Sun).

2. It must be big enough that its gravity cleared away any other objects of a similar size near its orbit around the Sun.

Explanation:

I hope this helps!

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A ball is thrown straight up in the air.When the ball reaches its highest point, which of the following is true?a. It is in equi

olasank [31]

Answer:

option E.

Explanation:

When the ball is at the highest point the velocity of the ball is zero.

At the height point the kinetic energy is zero and potential energy is maximum.

At maximum point momentum cannot be maximum because velocity is zero.

Acceleration on the ball is equal to acceleration due to gravity on the ball.

Hence, the correct answer is option E.

4 0

3 years ago

You have DNA samples from five different suspects. You know that all humans have very similar DNA. What feature of DNA allows yo

Aneli [31]

Answer:

The answer is positively B.

There are so many base pairs that there are individual differences.

Confirmed by my Forensics test today.

Explanation:

4 0

3 years ago

Change in Energy Quick Check

nika2105 [10]

Answer:

The force of gravity on the object decreases. (FALSE)

The potential energy of the object decreases. (TRUE)

The acceleration due to gravity decreases. (FALSE)

The kinetic energy of the object decrease (FALSE)

Explanation:

FORCE OF GRAVITY:

Force of gravity on the object is the weight of object, which depends upon the mass and value of acceleration due to gravity (W = mg). Since, the value mass is constant on Earth and acceleration due to gravity is also constant on earth.

Therefore, force of gravity remains same on the object. The statement is false.

POTENTIAL ENERGY:

Potential energy of object depends upon the mass, value of acceleration due to gravity, and change in height of object (P.E = mgΔh). Since, the value mass is constant on Earth and acceleration due to gravity increases as the object moves towards the surface of earth. But, the height of object is decreasing.

Therefore, potential energy of object decreases. The statement is true.

ACCELERATION DUE TO GRAVITY:

Acceleration due to gravity depends upon the altitude (gh = g[1 - 2h/Re]). Since, the height of object is decreasing.

Therefore, acceleration due to gravity increases. The statement is false.

But, this change is not significant.

KINETIC ENERGY:

Kinetic Energy of object, which depends upon the mass and velocity of the object (K.E = mv²/2). Since, the value mass is constant on Earth and velocity increases as the object moves towards the surface of earth.

Therefore, kinetic energy of the object also increases. The statement is false.

4 0

4 years ago

The fluid pressure 10 ft underwater is _____ the fluid pressure 5 ft underwater. A.less than or greater than, depending on what

just olya [345]

I would say greater than because as you do deeper, the pressure strengthens. If you were in a 10 ft deep pool and you dive all the way to the bottom, the ears usually pop. That's because of the pressure. Whereas if you were to go five feet, your ears wouldn't. It depends on the age of the person. Hope this helps.

5 0

4 years ago

A +26.3 uC charge qy is repelled by a force

Musya8 [376]

Answer:

+1.46×10¯⁶ C

Explanation:

From the question given above, the following data were obtained:

Charge 1 (q₁) = +26.3 μC = +26.3×10¯⁶ C

Force (F) = 0.615 N

Distance apart (r) = 0.750 m

Electrical constant (K) = 9×10⁹ Nm²/C²

Charge 2 (q₂) =?

The value of the second charge can be obtained as follow:

F = Kq₁q₂ / r²

0.615 = 9×10⁹ × 26.3×10¯⁶ × q₂ / 0.750²

0.615 = 236700 × q₂ / 0.5625

Cross multiply

236700 × q₂ = 0.615 × 0.5625

Divide both side by 236700

q₂ = (0.615 × 0.5625) / 236700

q₂ = +1.46×10¯⁶ C

NOTE: The force between them is repulsive as stated from the question. This means that both charge has the same sign. Since the first charge has a positive sign, the second charge also has a positive sign. Thus, the value of the second charge is +1.46×10¯⁶ C

5 0

3 years ago

What 2 rules￼￼ do scientists use to determine if something is a planet￼.

What 2 rules do scientists use to determine if something is a planet.