Select the statement that best describes how the forces relate. (2 points)
2 answers:
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Answer:
a) J=
b) F =
c) The force is 2551.02 times bigger than the weight of the pollen grain.
Explanation:
a) we know that the impulse J is equal to:
J =
where M is the mass, is the final velocity and
the initial velocity. So, replacing values, we get:
J =
J =
J=
b) We know that the force is equal to:
F = J/t
where J is the impulse and t the time. So, replacing values, we get:
F =
F =
c) The weight W of the pollen grain is calculated as:
W =
W =
So, if we compare the force and the weight of the pollen grain, we get:
it means that the force is 2551.02 times bigger than the weight of the pollen grain.
Answer:
1. smaller objects cannot generate enough pressure to start hydrogen fusion.
2. 10,000,000
Explanation:
1. Stars are born in stellar nurseries known as nebula. A nebula is cloud of dust and gases. The disk of dust and gases when spins and gathers more and more mass, the temperature and pressure rises. If sufficient mass is gathered and right temperature and pressure is achieved fusion reaction starts and a star is born. Thus, smaller objects cannot generate enough pressure to start hydrogen fusion.
2. the core of a star must reach a temperature of <u>10,000,000</u> degrees Celsius for hydrogen fusion to begin.
Hydrogen fusion reaction in sun is:
Overall reaction for the above series of reactions is given by:
Given that,
Energy
Surface temperature = 11000 K
Emissivity e =1
(a). We need to calculate the radius of the star
Using formula of energy
Put the value into the formula
(b). Given that,
Radiates energy
Temperature T = 10000 K
We need to calculate the radius of the star
Using formula of radius
Put the value into the formula
Hence, (a). The radius of the star is
(b). The radius of the star is