Which of the following statements are true? check all that apply. view available hint(s) check all that apply. the average kinetic energy of gas molecules decreases with decreasing temperature. the kinetic energy of a molecule cannot determine its speed. the average speed of gas molecules decreases with decreasing temperature. there are gas molecules that move slower than the average. all the gas molecules in a sample cannot have the same kinetic energy. part b what are each of the following observations an example of? drag the appropriate items to their respective bins. view available hint(s) diffusion effusion part c which statements about a sample of gas containing molecules of different masses are true? check all that apply. view available hint(s) check all that apply. the rms speed depends only on temperature, and so all types of particles in the sample have the same rms speed. more-massive gas molecules in the sample have lower rms speed than less-massive ones. more-massive gas molecules in the sample have higher rms speed than less-massive ones. provide feedback

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =