His knees are flat in front of him or 180 degrees, i hope that answered your question
Answer:
A) 4.035 × 10^(9) J
B) 9.29 × 10^(9) J
Explanation:
We are given;
Capacitance of the original capacitor; C = 1.33 F
Potential difference given to the original capacitor; V = 77.9 kV = 77.9 × 10³ V
A) The formula for Potential energy (U) for the original capacitor is given as:
U = ½CV²
Plugging in the relevant values, we have;
U = ½ × 1.33 × (77.9 × 10³)²
U = 4.035 × 10^(9) J
B) We are told that the capacitor with dielectric constant of 427, was replaced with one possessing a dielectric constant of 983.
Thus;
U = ½ × 1.33 × (983/427) × (77.9 × 10³)²
U = 9.29 × 10^(9) J
Answer:
Explanation:
The missing question her is: What is the change in momentum of the baseball?
According to the Impulse-Momentum Theorem, we have:
Where:
is the exerted force
is the time interval
is the change in momentum
So, in the case of the bat and the ball we have:
For the bat:
(1)
For the ball:
(2)
Since is the same for both the bat and the ball, their impulses are equal in magnitude but in opposite direction according to Newton's 3rd law of motion. Hence:
(3)
Then:
(4)
Where:
Being , ,
Being
Then (4) is rewritten as:
(5)
Since :
(6)
Isolating :
(7)
(8)
(9)
Now, the change in momentum of the baseball is:
(10)
Substituting (9) in (10):
(11)
Finally:
This is the change in momentum of the baseball. Note it is negative because its initial velocity is greater than its final velocity