Explanation:
It is given that,
Total mass is 70 kg
The truck exerts a constant force of 20 N.
Then the net force is given by :
F = ma
a is acceleration of rider
Initial velocity of rider is 0. So, using equation of kinematics to find the final velocity as :
Since, 1 m/s = 2.23 mph
4.28 m/s = 9.57 mph
So, the speed of the rider is 4.28 m/s or 9.57 mph.
Answer:
d. There is no way of knowing the phase composition without more information.
Explanation:
There is no way to ascertain the phases present in the container when equilibrium is established because we are not furnished with enough information.
- The most important information needed to have a deeper understanding and provide solution is temperature.
- Liquid water and ice can both exist at the same temperature.
- So we cannot conclude based on the information at hand.
or one hailstone we have;
Force = Mass X acceleration = 0.005kg x 9.8.} This is when the hailstone is not inclined at an angle.
When the hailstone is inclined at an angle of 45, then the component of force along the glass window will be F =0.005kg x 9.8 x sin45= 0.005kg x 9.8 x 0.707= 0.0346N.
Therefore, total force for the 500 hailstones would be 500x0.0346N=17.32N
This force is acting on an area equal to 0.600m2
Pressure = Force per unit area = 17.32N/0.600m2 = 28.9Pa
Answer:
Hey
Stars can be classified according to their surface Temperature
and their Luminosity (how brightly they shine)
Most stars fall on the Main Sequence Hertzberg-Russell (HR) diagram.
These stars are relatively Stable
About 90% of stars are Red Giants
and Super Giants. which shine brightly but at a low temperature, so with a large volume.
White dwarf are very hot and small, and don't shine and very brightly.
A group of unstable stars called Cepheids appear between the main sequence and the red giants.
What happens next to a star depends on its Mass birth .
Very high mass stars can become Supernova and they finally either Neutron stars or Black Holes