Khaled said the North star is special because it appears all over the world and its changes position.

A friend of yours who has not taken astronomy sees a meteor shower (she calls it a bunch of shooting stars). The next day she co

Oxana [17]

Tell her meteors and stars aren't related a stars life time is extremely long and meteors are just rocks floating through space when they fly be the earth they can appear like falling stars but they aren't her fave constellation wont be going away any time soon

3 0

4 years ago

7) You think you have found a diamond. Its mass is 5.28 g and its volume is 2 cm3. Calculate the density

lesya [120]

Answer:

$\boxed {\tt d=2.64 \ g/cm^3}$

$\boxed {\tt Not \ a \ diamond}$

Explanation:

Density can be found by dividing the mass by the volume.

$d=\frac{m}{v}$

The mass is 5.28 grams and the volume is 2 cubic centimeters.

$m=5.28 \ g\\v= 2 \ cm^3$

Substitute the values into the formula.

$d=\frac{5.28 \ g }{2 \ cm^3}$

Divide.

$d=2.64 \ g/c^3$

The density of the unknown substance is 2.64 grams per cubic centimeter.

The density of a diamond is about 3.5 grams per cubic centimeter. Since 2.64 is not equal to 3.5, the unknown substance is not a diamond.

6 0

4 years ago

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge?

Gekata [30.6K]

Answer:

The power of the distance is -1.

Explanation:

The equation for the electric potential of a point charge is given by $V= k\frac{q}{r}$

where V is the electric potential, k is Coulomb's constant (it has a value of $9.0*10^{9}$ with units $\frac{Nm^{2} }{c^{2} }$ ), q is the electric charge of the small charge and r is the distance from the charge.

Now, the power of a number is how many times we multiply that number by itself; we see r appears only once in the equation. So we know the power is 1. But we can see in the equation that k and q are divided by r, which means r is the denominator. This means the power of r is negative (-).

Therefore, the power of r is -1.

5 0

3 years ago

Which phenomenon causes an object to appear bent from above the surface of one medium to below the surface of another medium? A)

vazorg [7]

Answer:

Option (D)

Explanation:

Refraction is defined as the phenomenon where the light changes its course of path while travelling from one type of medium to another. This also affects the speed of the light. This process results in the formation of images by the human eyes and lenses.

This process appears to be bending of light. When a light passes from a lighter to a denser medium, it gets bend towards the normal. And when the light passes from a denser to a lighter medium then it gets bend away from the normal.

Thus, the correct answer is option (D).

3 0

3 years ago

Read 2 more answers

The gravitational force between two objects is proportional to the square of the distance between the two objects.

Darina [25.2K]

Answer: True!

Explanation: The force is proportional to the square of the distance between 2 point masses

3 0

3 years ago