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3 years ago

What is cosmic microwave background radiation?

1 answer:

6 0

Cosmic, or background, radiation is the small amount of high energy radiation which is mostly left over from the big bang or from supernovas. It is mostly single protons, but also alpha particles and even sometimes heavier elements. It can also refer to the low levels of electromagnetic radiation present all over the universe.

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A ball is dropped from rest at point O (height unknown). After falling for some time, it passes by a window of height 3 m and it

Usimov [2.4K]

Answer:

Part a)

$\Delta v_{down} = 4.8 m/s$

Part b)

$v_a = 3.71 m/s$

Explanation:

Since ball is dropped under uniform gravity

so here we can say that the distance of 3 m moved by the ball under uniform acceleration is given as

$d = (\frac{v_f + v_i}{2})t$

so we have

$3 = (\frac{v_f + v_i}{2})(0.49)$

$v_f + v_i = 12.24$

also we know that

$v_f - v_i = at$

$v_f - v_i = (9.81)(0.49)$

$v_f - v_i = 4.81$

now we will have

$v_f = 8.52 m/s$

$v_i = 3.71 m/s$

Part a)

$\Delta v_{down} = v_b - v_a$

$\Delta v_{down} = 8.52 - 3.71$

$\Delta v_{down} = 4.8 m/s$

Part b)

speed at the top of the window is

$v_a = 3.71 m/s$

3 0

3 years ago

True or false<br><br>energy can neither be created nor be destroyed<br>

muminat

Answer:

the correct answer is TRUE

Hope it helps you

have a nice day

4 0

3 years ago

Read 2 more answers

3.1 Two waves A and B have frequencies 256 Hz and 1024 Hz respectively have amplitude in ratio 3:1 1.What is their ratio of freq

scoundrel [369]

Answer:

1. the one with the raito

2. the one that stubbed their toe

Explanation:

8 0

3 years ago

The heat released by burning candle is an example of thermal energy

yawa3891 [41]

False the correct answer is chemical bonds instead of thermal energy

4 0

3 years ago

Read 2 more answers

Can A positively charged body attract another positively charged body

andriy [413]

Like charges repel, unlike charges attract

Two protons will also tend to repel each other because they both have a positive charge. On the other hand, electrons and protons will be attracted to each other because of their unlike charges.

So I would say no, unless the two bodies are placed close to each other where one has much more charge than the other, then due to induction, force of attraction becomes more than the force of repulsion.

3 0

3 years ago