What is the differences between novae and supernovae?

Answers

Answer 1

Answer:

Answer:

Explanation:

Nova comes from the Latin which means "new star" and is associated with a sudden brightening of a star and then gradually returns to its original form over a period that may vary from weeks to years.

While Supernova is infrequent celestial phenomena associated with the explosion of the material of star which results in a bright short-lived entity that emits a large amount of energy.

Supernova destroys its host star while nova does not destroy its host star and results in only a small amount of mass destruction.

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Describe the factors that determine power in your own words (not from a website)

2x+4y
GCF for the polynomial

Answers

Answer:

$\boxed{2}$

Explanation:

The GCF is the greatest common factor of the polynomial.

$2x = 1, \ 2, \ x$

$4y=1, \ 2, \ 4,\ y$

The greatest common factor is 2.

What is the total energy of a 175,000kg shuttle orbiting the Earth at 600km above Earth's surface?

Answers

m = 175,000 kg
g = 10 m/s^2
h = 600,000 m

Ep = mgh
Ep = 1050 * 10^9 [J]

How many days will it take for one half of the original amount of a radioactive substance to decay if the half-life is 30 days?a. 3 days
b. 15 days
c. 30 days
d. 60 days

Answers

Answer:

C. 30 years

Explanation:

Half life of a radioactive substance is defined as the time taken by the substance to decay to half of its original value.

The number of days it will take for one half of the original amount of a radioactive substance to decay given the half life of 30 years will be that same 30years according to the half life definition.

According to the formula for half life t1/2 = ln2/¶ where ¶ is the decay constant.

¶ = ln2/t1/2

¶ = ln2/30

¶ = 0.023

Using the radioactivity formula to get the time it will take 1/2 of the original amount to decay, we have;

N/No = e^-¶t where

N/No is the fraction of amount decayed at time t i.e 1/2

Substituting the given values in the equation, we have;

1/2 = e^-0.023t

ln1/2 = lne^-0.023t

ln1/2 = -0.023t

t = ln0.5/-0.023

t = 30years.

C 30 days it answers the question in itself

A wrench reduces the force needed to tighten a bolt. For this statement to be true, the wrench _____.

Answers

Answer:

Increases the input force and decreases the input distance

Explanation:

When a force is applied over a given distance, there is an inverse relationship between the applied force and distance. Example is a tommy bar, when the length increases the force required decreases. This principle is applied to this wrench.

It is B, I honestly didn't know

If the wavelength of a photon in vacuum is the same as the de broglie wavelength of an electron, then the

Answers

Answer:

Explanation:

The photons travel faster faster through space because photons always travel through space faster than electrons, in fact when an electron gets hitted by a photon this boost its speed

A bookshelf is 2m long, with supports at its end (p and q). A book weighing 10N is placed in the middle of the shelf. what are the upward forces acting on p and q. if the book is moved 50 cm from q, what are the forces at p and q now?

Answers

When the book is placed in the middle, the forces acting on p and q is 5N. When the book is moved 50 cm from q, the forces at p and q can be solved by doing a moment balance
With p as the pivot
Fq (2 m) = 10 N (0.5 m)
Fq = 2.5 N
and
Fp = 10 N - 2.5 N = 7.5 N

Answer:

Fq = 2.5N

Fp = 7.5N

Explanation:

Hello! Let's solve this!

When the book is in the middle, the force in p (Fp) and the force in q (Fq) are equal, and half of the total force

Fp = Fq = 5N

When the book moves 0.5m from q we have a balance

Fq * 2m = 10N * 0.5m

We cleared Fq

Fq = (10N * 0.5m) / 2m

Fq = 2.5N