Explanation:
To determine whether something is living or nonliving, a living thing must meet seven specific characteristics: feeding, movement, respiration, excretion, growth, sensitivity, and reproduction. A living organism needs to be able to feed to make energy and grow.
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C.
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The box is kept in motion at constant velocity by a force of F=99 N. Constant velocity means there is no acceleration, so the resultant of the forces acting on the box is zero. Apart from the force F pushing the box, there is only another force acting on it in the horizontal direction: the frictional force
which acts in the opposite direction of the motion, so in the opposite direction of F.
Therefore, since the resultant of the two forces must be zero,
so
The frictional force can be rewritten as
where
,
. Re-arranging, we can solve this equation to find
, the coefficient of dynamic friction:
Answer:
When air temperature is higher, the weather is warmer.
Answer:
g= 1.8 m/s²
Explanation:
From conservation of energy we know:
Solving for g with h being the height of the ramp with angle ∅ and length L:
(1)
The velocity v at the bottom of the ramp for a constant acceleration a in a time t is given by:
(2)
Plugging equation 2 in to equation 1:
(3)