How do scientists estimate how old the universe is?

Physics

1 answer:

svet-max [94.6K]3 years ago

8 0

13.772 billions years old
I hope this did help.

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Why do you see lightning before you hear thunder

igomit [66]

Answer: When a lightning bolt travels from the cloud to the ground it actually opens up a little hole in the air, called a channel. Once then light is gone the air collapses back in and creates a sound wave that we hear as thunder. The reason we see lightning before we hear thunder is because light travels faster than sound!

Explanation:

5 0

3 years ago

A skydiver of mass 113kg

yan [13]

Answer:

Option b.

Explanation:

Weight of skydiver = mass × acceleration due to gravity

= 113 × 9.81 N

= 1108.53 N

Now,

The weight is acting downwards and air resistance is acting upwards. So,

Net force = weight - air resistance

Net force = 1108.53 - 660

Net force = 448.53

Closest value is option b.

4 0

3 years ago

A roller coaster car is going over the top of a 18-mm-radius circular rise. At the top of the hill, the passengers "feel light,"

Andre45 [30]

Answer:

0.29713 m/s

Explanation:

m = Mass of person

g = Acceleration due to gravity = 9.81 m/s²

v = Velocity

r = Radius = 18 mm

By balancing the forces in the system we have

$mg-N=\dfrac{mv^2}{r}\\\Rightarrow mg-\dfrac{mg}{2}=\dfrac{mv^2}{r}\\\Rightarrow v=\sqrt{r(g-\dfrac{g}{2})}\\\Rightarrow v=\sqrt{0.018\times (9.81-\dfrac{9.81}{2})}\\\Rightarrow v=0.29713\ m/s$