How large amount of energy is produced during the fission of uranium
1 answer:
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Answer:
<em> B) The voltage on dry skin needs to be 200 times larger than the voltage on wet skin.</em>
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Explanation:
This is the complete question
A person will feel a shock when a current of greater than approximately 100μ A flows between his index finger and thumb. If the resistance of dry skin is 200 times larger than the resistance of wet skin, how do the maximum voltages without shock compare in each scenario?
A) The voltage on dry skin needs to be 200 times smaller than the voltage on wet skin.
B) The voltage on dry skin needs to be 200 times larger than the voltage on wet skin.
C) The voltage on dry skin is the same as the voltage on wet skin.
D) The voltage on dry skin needs to be 40,000 times larger than the voltage on wet skin.
Ohm's law states that electric current is proportional to voltage and inversely proportional to resistance.
the equation is written as
V = IR
Where V is the voltage
I is the current
R is the resistance
for this case, the current I is 100μ A = 100 x 10^16 A
resistance of wet skin = R
resistance of dry skin = 200R
for the wet skin, voltage will be
V = IR =
for dry skin, voltage will be
V = IR =
Comparing both voltages
÷
= 200
<em>this means that the voltage on the wet skin should be 200 times lesser than the voltage on the dry skin or the voltage on the dry skin should be 200 times more than the voltage on the wet skin.</em>
Answer:
The initial velocity of the softball is 14.711 meters per second.
Explanation:
This is a case of an object which experiments a free fall, that is, an uniform accelerated motion due to gravity and in which effects from air friction and Earth's rotation can be neglected.
From statement we must understand that the student threw the softball upwards and it is caught at original position 3.56 seconds later. Initial and final heights, time and gravitational acceleration are known and initial speed is unknown. The following equation of motion is used:
(Eq. 1)
Where:
- Initial height of the softball, measured in meters.
- Final height of the softball, measured in meters.
- Initial velocity of the softball, measured in meters per second.
- Time, measured in seconds.
- Gravitational acceleration, measured in meters per square second.
If we know that ,
and
, the initial velocity of the softball is:
The initial velocity of the softball is 14.711 meters per second.