A. The kinetic energy in the waves has enough mechanical energy to knock over the sand castle
B.Plants use potential energy from the sun in order to grow
C.You use the potential energy in your breakfast, stored as glucose, to have energy for the school day
D. Your potential energy from height transfers to mechanical energy as you drop the plate, and the energy transfer breaks the plat
E.There is potential electrical energy from the outlet that can be converted to mechanical energy to power your hair dryer
Think of energy as the ability to do work, and then just pick a energy type that fits the situation to come up with an explanation.
Answer:
The correct option is C
Explanation:
According to third equation of motion, v
2
=u
2
+2ax
Here, u=0 m/s
a=−g and x=−h
Negative sign indicates downward direction. Displacement and acceleration both are downwards.
So,v=±
2(−g)(−h)
We take minus sign because it is downwards.
v=−
2gh
After bouncing. velocity becomes 80% of v, i.e.,
v
′
=+0.8
2gh
(positive sign because the direction of ball has reversed after bouncing and is upwards.
Applying third equation of motion again, for u=v
′
, v=0 and a=−g
v
2
=u
2
+2×a×x
Thus,
0=0.64(2gh)+2(−g)x
or
x=0.64h
Answer:
Stars live to long to be observed from birth to death
Explanation:
The life expectancy of a star are millions of years compared to that of human thereby making it difficult to study the life path and activities of the stars till the point of extinction. This brought about scientist studying different star with different ages in order to answer their burning question on formation of stars which is called the figuring out process(stellar activity) and this makes it difficult and tedious.
The product of (frequency) times (wavelength) is always
the same number (the speed of the wave).
So if the frequency is doubled, the wavelength has to drop to
half of what it was, in order to keep their product constant.