All categories

3 years ago

Most white dwarfs are __ most giant stars.

1 answer:

5 0

Most white dwarfs are hotter than most giant starts and the reason why is because they are very dense, and because they are so dense that's why they are so hot.

You might be interested in

Light intensity is?

Fittoniya [83]

The correct answer is:
The rate at which a waves energy flows through a given unit of area

In fact, light intensity is defined as the light power per unit of area:
 $I= \frac{P}{A}$
but the power is the energy carried by the light per unit of time:
 $P= \frac{E}{t}$
this means that the intensity can be rewritten as
 $I= \frac{E}{tA}$ 
So, it's basically the rate of energy (per unit of time) through a given surface.

5 0

3 years ago

Read 2 more answers

Before using wind energy to produce electricity, humans used wind energy to produce PLEASE ANSWER QUICKLY

topjm [15]

Answer:

Water

Explanation:

windmills were used to bring water to farms in ancient times.

8 0

3 years ago

An open train car moves with speed 18.5 m/s on a flat frictionless railroad track, with no engine pulling the car. It begins to

olga2289 [7]

Answer:

The speed decreases.

Explanation:

This can be explained using the conservation of linear momentum.

Since there is no friction, the initial moment of the train must be equal to its linear moment after it is filled with water.

the initial linear momentum is

$m_{1}v_{1}$

where $m_{1}$ is the initial mass of the train, and $v_{1}$ the initial speed of the train.

And linear momentum after the water filled the train car is

$m_{2}v_{2}$

where $m_{2}$ is mass of the train after the rain, and $v_{2}$ the speed of the train after the rain

the equality must be fulfilled:

$m_{1}v_{1}=m_{2}v_{2}$

We know that if water is added to the train, $m_{2}$ that is the mass after the water is added, is greater than $m_{1}$ which is the mass of the train without the water.

Therefore, in order for the conservation of the linear momentum to be fulfilled: $m_{1}v_{1}=m_{2}v_{2}$

the speed after the water is added ( $v_{2}$ ) must be smaller than the initial train speed ( $v_{1}$ ) . So the speed of the car decreases.

3 0

3 years ago

When a substance gains electrons, is it positively or negatively charged?

mina [271]

Answer:

negative charge

Explanation:

7 0

2 years ago

A galvanometer is used as a

agasfer [191]

Answer:

detecting and indicating an electric current

4 0

3 years ago