4 years ago

Which two element families are shown at the bottom of the periodic table, separate from the rest of the elements?

Physics

1 answer:

Ymorist [56]4 years ago

3 0

The <span>actinides and lanthanides.</span>

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The Sun has a mass of 1.99x10^30 kg and a radius of 6.96x10^8 m. Calculate the acceleration due to gravity, in meters per second

just olya [345]

Answer:

$g=274\ m/s^2$

Explanation:

Mass of the Sun, $M=1.99\times 10^{30}\ kg$

The radius of the Sun, $r=6.96\times 10^8\ m$

We need to find the acceleration due to gravity on the surface of the Sun. It is given by the formula as follows :

$g=\dfrac{GM}{r^2}\\\\g=\dfrac{6.67\times 10^{-11}\times 1.99\times 10^{30}}{(6.96\times 10^8)^2}\\\\g=274\ m/s^2$

So, the value of acceleration due to gravity on the Sun is $274\ m/s^2$ .

8 0

3 years ago

If an object falls with constant acceleration, the velocity of the object must continually change by varying amounts, depending

Ierofanga [76]

Answer:

continually change by the same amount each second

Explanation:

We all are aware with the fact that a car speeds is increased when we put our feet on the accelerator. The rate at which the particle's velocity change with time is called its acceleration. If the particle's velocity changes with constant rate, then its rate is called the constant acceleration.

Since the basic units are meter and seconds. And the SI unit of velocity is $m/s$ and acceleration's SI unit is $m/s^{2}$

For example if the velocity is change from 2 to 4 m/s in 1 sec its acceleration is $2m/s^{2}$ and again its velocity is change with 4 m/s to 6 m/s will again give constant acceleration in 1 s is $2m/s^{2}$ .