Answer:
Rotating the coil faster
Increasing the number of coils
Using stronger magnets
Endothermic: ice melting into water, and an instant ice pack turning cold
Exothermic: fireworks exploding, and gasoline burning
Answer:
The combinations are
1. C ,
2. C ,
Explanation:
The force between two charges q and Q is given by Coulomb's law.
The coulomb force is given by
Where, r be the distance between two charges
According to the question,
r = 15 cm, Q = C, q = C , F = 12 N
Force remains same, distance remains same
so the product of Q and q be same
The product of Q and q is
So other combination of charges are
1. C ,
2. C ,
Answer:
a)
b)
Explanation:
We start the exercise knowing that a ball is thrown up with an initial velocity of 65 ft/s with an initial height of 680 ft.
To calculate the maximum heigh, we know that at the top of the motion the ball stop going up and start going down because of the <em>gravity</em>
First of all, we need to calculate the time that takes the ball to reach the maximum point.
a)
Knowing that time, <u><em>we can calculate the height to which the ball rises:</em></u>
b) Now, to know the time that the ball reach the bottom of the cliff, we know that the final height is y=0ft
This is a classic quadratic equation, that can be solve using the quadratic formula
a=-16.1
b=65
c=640
Solving for t, we have that
or
Since the time can not be negative:
Yes radiation is engery from the sun