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3 years ago

What is The common value for the speed of light in a vacuum

1 answer:

4 0

The most common value for the speed of light is 3*10^8 meters/second.

A more accurate number is 299 792 458 m/second, but that number is hardly ever used.

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The graph represents velocity over time. What is the acceleration? –0.4 m/s2 –0.2 m/s2 0.2 m/s2 0.4 m/s2

Olenka [21]

Missing graph. I attach it in the answer.

In a uniformly accelerated motion, the velocity at time t is given by:
$v(t)=at$
where a is the acceleration and t is the time.

Given the previous equation, if we plot v(t) versus t, we find a straight line; moreover, a (the acceleration) represents the slope of the curve.

Looking at the graph, we see that when the time goes from 10 s to 20 s, the velocity increases from 4 m/s to 6 m/s. Therefore the slope of the curve is
$a= \frac{\Delta v}{\Delta t}= \frac{6 m/s-4 m/s}{20 s-10 s}= \frac{2 m/s}{10 s}=0.2 m/s^2$
and this corresponds to the acceleration.

So, the correct answer is 0.2 m/s2.

7 0

3 years ago

Read 2 more answers

The force measuring instrument is called

Phoenix [80]

This instrument is called a spring scale.

5 0

3 years ago

Read 2 more answers

A 0.300 kg ball, moving with a speed of 2.5 m/s, has a head-on collision with at 0.600 kg ball initially at rest. Assuming a per

FrozenT [24]

Answer:

1.25 m/s

Explanation:

Given,

Mass of first ball=0.3 kg

Its speed before collision=2.5 m/s

Its speed after collision=2 m/s

Mass of second ball=0.6 kg

Momentum of 1st ball=mass of the ball*velocity

=0.3kg*2.5m/s

=0.75 kg m/s

Momentum of 2nd ball=mass of the ball*velocity

=0.6 kg*velocity of 2nd ball

Since the first ball undergoes head on collision with the second ball,

momentum of first ball=momentum of second ball

0.75 kg m/s=0.6 kg*velocity of 2nd ball

Velocity of 2nd ball=0.75 kg m/s ÷ 0.6 kg

=1.25 m/s

4 0

3 years ago

A gaseous sample of this element is bombarded by photons of various energies (in these same units). Match each photon to the res

solniwko [45]

1) n=1 -> n=2 : delta E = -5+11 = 6. The answer is D
2) n=1 -> n=3 : delta E = -2+11 = 9. The answer is B 
3) n=1 -> n=4 : delta E = -1+11 = 10. No solution available 
4) n=1 -> infinity delta E = 11. The answer is A 
5) not absorbed would be C, as there is no transition with delta E of 8.

8 0

3 years ago

Please hurry Describe why electric currents can be dangerous

konstantin123 [22]

Answer:

Cardiac Arrest, burns, and nerve damage.

Explanation:

Basically, the main risk is cardiac arrest, caused by the electric current interfering with the normal operation of the heart muscle. Other possible damages are burns due to the electric energy vaporizing the water inside the cells, and nerve damage caused by excessive current through the nerves.

7 0

3 years ago