All categories

4 years ago

When the core of a star like the sun uses up its supply of hydrogen for fusion, the core begins to ________?

Physics

1 answer:

daser333 [38]4 years ago

5 0

Answer: shrink and heat

Stars similar to our Sun use hydrogen as fuel, creating helium in the process of nuclear fusion.

Now when the hydrogen is used up, the core of the star reaches such a temperature that begins to transform the helium into carbon. That is, the core heats up more due to the continuous fusion reactions and shrinks because it will not have enough pressure to maintain its size.

You might be interested in

A tugboat pulls a ship with a constant net horizontal force of 50 N and causes the ship to move through a harbor. How much work

Vlad [161]

Answer:

1500J

Explanation:

Work done = Force * Distance

Work = ?

Force = 50N

Distance = 30m

Work = 50 * 30

Work = 1500J

5 0

3 years ago

In a particular television picture tube, the measured beam current is 23.3 µA . How many electrons strike the tube screen every

zysi [14]

Answer:

Explanation:

Given that

Beam current (i)=23.3µA

And the time to strike(t)=28s

Also, a fundamental charge e=1.602×10^-19C

Then, the charge quantity is given as,

q=it

Then, q=23.3×10^-6×28

q=6.524×10^-4C

Also, the number of electron N is given as

q=Ne

Therefore, N=q/e

So, N=6.524×10-4/1.602×10^-19

N=4.072×10^15

There are 4.072×10^15 electrons strike the tube screen every 28 s.

7 0

3 years ago

What happens to the kinetic energy of water when it changes from the liquid state to the solid state

d1i1m1o1n [39]

k e is energy of movement. When thing solidifies, atoms stop moving ke is less.

8 0

3 years ago

"A 75 kg swimmer dives horizontally off a 500 kg raft. If the diver's speed immediately after leaving the raft is 4 m/s, what is

svet-max [94.6K]

Answer:

0.6 m/s

Explanation:

Let the raft speed be v.

Given:

Mass of the swimmer (m) = 75 kg

Mass of the raft (M) = 500 kg

Speed of swimmer after leaving the raft (u) = 4 m/s

Now, the given situation can be considered a problem of conservation of total momentum before and after collision.

Momentum is the product of mass and velocity.

Here, the swimmer and raft are the bodies in collision.

So, before the collision, both the bodies were at rest. So, initial momentum is 0. Now, from conservation of momentum, the final momentum of the system must be 0 after the collision. Therefore,

Final Momentum = 0

$mu+Mv=0\\\\Mv=-mu\\\\v=-\dfrac{mu}{M}$