Jorge wishes to observe the progress of his vacuum pump in evacuating a tall bell jar for the purpose of demonstrating that sound waves do not travel in a vacuum. so, jorge places a mercury barometer inside the bell jar and follows the height of the mercury column as the pump chugs away. when he observes a height of 8.69 mm, what fraction of atmospheric pressure, expressed as a percentage, has jorge achieved in his bell jar? the density of mercury is 1.36 × 10 4 kg/m 3 and the standard atmospheric pressure is 1.01 × 10 5 pa. the acceleration g due to gravity is 9.81 m/s 2 . g

1.147 %

Explanation:

= Density of mercury =

g = Acceleration due to gravity = 9.81 m/s²

h = Height of mercury = 8.69 m

Standard atmospheric pressure =

6.55 mmHg converting to Pa

Dividing air pressure by the above value

The fraction of atmospheric pressure is 1.147 %

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.