Humans need a digestive system to do cellular respiration, which produces energy used for growth and movement.
Plants do not need one as they make their own energy through photosynthesis. The process produces glucose, which is a form of energy for the plants.
Light energy is not kinetic energy
Answer:

Explanation:
The centripetal force acting on the car must be equal to mv²/R, where m is the mass of the car, v its speed and R the radius of the curve. Since the only force acting on the car that is in the direction of the center of the circle is the frictional force, we have by the Newton's Second Law:

But we know that:

And the normal force is given by the sum of the forces in the vertical direction:

Finally, we have:

So, the minimum value for the coefficient of friction is 0.27.
Answer:
Orbital Eccentricity
Planet Orbital Eccentricity
(Point in Orbit Closest to Sun)
measured in AU's
Mercury 0.206
Venus 0.007
Earth 0.017
Mars 0.093
Jupiter 0.048
Saturn 0.056
Uranus 0.047
Neptune 0.009
Pluto 0.248
Explanation:
link to information:
https://www.enchantedlearning.com/subjects/astronomy/glossary/Eccentricity.shtml
Answer:

Explanation:
Given:
sides of the cube, 
speed of the cube with respect to the observer, 
Since the relative velocity of the object is relativistic, so there will be a length contraction according to the observer:
where:
observed length of the side along the direction of velocity

is the observed length of the cube edge only in the direction of the velocity due to relativistic effect of length contraction.
So the observed volume will be:


