Ask question

Ask question

All categories

3 years ago

5

Scientists can measure the amounts of different elements found in the universe. Which element's concentration in the universe is

evidence for the big bang theory?
A. Helium
B. Uranium
C. Calcium
D. Iron

1 answer:

fgiga [73]3 years ago

5 0

Uranium is the correct answer

You might be interested in

Density is a measure of an object's _____ per unit _____.

ladessa [460]

<span>Density is a measure of an object's </span>mass per unit of volume

Which means that it shows how much mass is contained within a volume of something.

7 0

3 years ago

What description refers to fog?

wolverine [178]

I think the answer is D

4 0

3 years ago

1. Ramon puts two magnetic toy trains very close to each other on a track. What will happen next, and

FrozenT [24]

Answer:

If one side of the train is positive and the other is negative they will attract if they are the same then they will repel.

Explanation:

If both are positive they will repel if both are negative they will repel and if they are opposites they will attract.

5 0

3 years ago

Read 2 more answers

What travels around the earth but stays in one spot?

mina [271]

The sun?? It stays in one spot, but from our point of view, it travels around the earth...

7 0

3 years ago

When the current in a toroidal solenoid is changing at a rate of 0.0240 A/s , the magnitude of the induced emf is 12.4 mV . When

Gemiola [76]

Answer:

The number of turns in the solenoid is 230.

Explanation:

Given that,

Rate of change of current, $\dfrac{dI}{dt}=0.0240\ A/s$

Induced emf, $\epsilon=12.4\ mV=12.4\times 10^{-3}\ V$

Current, I = 1.5 A

Magnetic flux, $\phi=0.00338\ Wb$

The induced emf through the solenoid is given by :

$\epsilon=L\dfrac{dI}{dt}$

or

$L=\dfrac{\epsilon}{(di/dt)}$ ........(1)

The self inductance of the solenoid is given by :

$L=\dfrac{N\phi}{I}$ .........(2)

From equation (1) and (2) we get :

$\dfrac{\epsilon}{(di/dt)}=\dfrac{N\phi}{I}$

N is the number of turns in the solenoid

$N=\dfrac{\epsilon I}{\phi (dI/dt)}$

$N=\dfrac{12.4\times 10^{-3}\times 1.5}{0.00338 \times 0.024}$

N = 229.28 turns

or

N = 230 turns

So, the number of turns in the solenoid is 230. Hence, this is the required solution.

3 0

3 years ago