Answer:
Explanation:
<u>First person:</u>
the rock is dropped
after t1 seconds it hit the ground, y(t)=0
<u>Second person:</u>
the rock has a initial downward speed
after t2 seconds it hit the ground, y(t)=0
the time t when the second person throws the rock after the first person release the rock is:
t=t1-t2
Answer:
I would say it is recycling nonrenewable minerals instead of throwing them away.
Explanation:
using grocery bags only once before disposing them is also bad, but plastic is not really a resource compared to how minerals are resources.
if we recycle nonrenewable resources instead of throwing them away we would damage true resources.
Answer:
5010 m
Explanation:
The vertical position of the teacher at time t can be found by using the equation:
where
h is the initial height
is the initial velocity (negative since it's downward)
is the acceleration of gravity
t is the time
The teacher reaches the ground when y = 0, so the equation becomes
Substituting t = 30 s, we find the initial height:
Answer:
Weight measurement at poles will be slightly more than at equator.
Explanation:
Firstly earth bulges at equator. This makes the body far from earth center at equator than poles. Secondly, the surface centrifugal forces of earth due to rotation also plays vital role in disturbing the gravity value. The centrifugal forces cancel the effect of gravity more at equator than at poles.These factors combine to create difference of about 0.5% in gravity values at pole and equator.
gravity at pole=9.832 m/s^2
gravity at equator=9.780 m/s^2
Answer:
An AC circuit
Explanation:
In Alternate current, current reverses many times periodically.