This outer covering is the seed<span> coat. </span>Inside<span> of the </span>seed<span> would be </span>a tiny plant called <span>the embryo. The two large parts of the </span>seed<span> are </span>called<span> the cotyledons. The cotyledons are stored food that the </span>young plant<span> will use while it is growing. Monocots are </span>seeds<span> that have only one cotyledon, such as the corn </span>seed<span>.</span>
Answer:
The girl is doing work on the ball because the energy in her muscles changed, even though the ball is not displaced.
Explanation:
The complete question is...
Which of these correctly describes whether a girl holding a ball in the same position is doing work on the ball?
-The girl is doing work on the ball because the energy of the ball changed, even though it is not displaced.
-The girl is doing work on the ball because the energy in her muscles changed, even though the ball is not displaced.
-The girl is doing no work on the ball because the ball is not displaced.
-The girl is doing no work on the ball because she is exerting a net force on the ball.
Holding up a ball costs energy, which is used to counter the work that would have otherwise be done on the ball by gravity. Although no physical distance is moved, we should consider the fact that by holding the ball, the girls hand exerts physical force to hold the ball in place. Also, there is a potential gravitational work on the ball due to gravity, but the force exerted by the girls hand does an equivalent of this gravito-potential work in order to counter it and hold the ball in place. All these activities eventually lead to a change in energy in her hand muscle to show that energy is expended.
I think the answer is c.if current decreases and everything else remains constant,then power will increase
Answer:
(A) 654.545 Kw
(B)
Explanation:
We have given resistance of the toaster
Resistance of nichrome heating element
Both the resistances are connected in series so same current will flow through the circuit
Potential difference across the toaster V = 120 volt
So current
(a) Power dissipated in toaster
(B) Power dissipated in heating element
Answer:
fem = -A β
Explanation:
Faraday's law gives the induced electromotive source (emf)
fem =
the magnetic flux is
= B. A = B A cos θ
the bold are vectros. In this case the normal to the ring is parallel to the magnetic field so the angle is zero cos 0 = 1, also the area of the ring is constant
fem = -A
we carry out the derivative of the function B = α + β t
fem = -A β
so we see that there is an electromotive force in the ring.