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NNADVOKAT [17]
4 years ago
15

Stars which never disappear below the horizon are called__stars. A. Polaris B. visible C. constellation D. circumpolar

Physics
1 answer:
miss Akunina [59]4 years ago
5 0

Answer:

D. circumpolar

Explanation:

A circumpolar star is a star, as viewed from a given latitude on Earth, that never sets below the horizon due to its apparent proximity to one of the celestial poles.

-Wikipedia

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Which objects have both potential and kinetic energy? Check all that apply.
wariber [46]
A falling raindrop
Kinetic energy and potential energy are both applied when a body or object is falling.
3 0
4 years ago
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Wich subatomic particle will you add or remove to change the charge of the atom A) Electrons or neutrons B)Neautrons or protons
Oxana [17]
B. Neutrons or Protons Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number. For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium. (Actually, a few neutrons have to be added as well to make the new nucleus stable, but the end result is still helium.)
6 0
3 years ago
Suppose you start an antique car by exerting a force of 270 N on its crank for 0.275 s. What angular momentum is given to the en
Ksenya-84 [330]

Answer:

L_f=22.27\ kg-m^2/s

Explanation:

Given that,

Force exerted on an antique car, F = 270 N

Time, t = 0.275 s

Distance, d = 0.3 m

To find:

The angular momentum given to the engine.

Solution,

We know that the relation between the angular momentum and the torque is given by :

\tau=\dfrac{dL}{dt}

Since, \tau=d\times F

dF=\dfrac{dL}{dt}

d.F=\dfrac{L_f-L_i}{t}

d.F=\dfrac{L_f}{t}

L_f=d\times F\times t

L_f=0.3\ m\times 270\ N\times 0.275\ s

L_f=22.27\ kg-m^2/s

So, the angular momentum given to the engine is 22.27\ kg-m^2/s.

7 0
3 years ago
In a thundercloud there may be an electric charge of 24 C near the top of the cloud and −24 C near the bottom of the cloud. If t
lidiya [134]

Answer:

Electric force, F=1.29\times 10^6\ N

Explanation:

Given that,

Charge 1, q_1=24\ C

Charge 2, q_2=-24\ C

Distance between charges, d = 2 km

The electric force is given by :

F=k\dfrac{q_1q_2}{d^2}

k is the electrostatic constant

F=8.98755\times 10^9\times \dfrac{(24)^2}{(2\times 10^3)^2}

F = 1294207.2 N

or

F=1.29\times 10^6\ N

Hence, this is the required solution.

5 0
4 years ago
One isotope of nitrogen has 7 protons and 8 neutrons. Which is the correct reference for this isotope? A. nitrogen-8 B. nitrogen
tamaranim1 [39]
When referring to an isotope, you refer to the mass of its protons and neutrons combined
7 + 8 = 15, so you would refer to it as C. Nitrogen-15
3 0
3 years ago
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