Answer:
a) 10 seconds
b) 100 meters
Explanation:
<u>Accelerated Motion
</u>
If an object is moving at contant speed, we know it has zero net force applied. As soon as an unbalanced force appears, the object accelerates (positive or negative) depending on the direction of the force with respect to movement. The speed of an object subject to acceleration is given by

The distance traveled is given by

a)
Our train is travelling at 20m/s when it decelerates at
(negative for it's against movement). If nothing else happens, it will eventually stop (
). We can compute the time at which it happens
:



b)
The distance traveled is



here we will use the torque balance about the knee joint
here we can say that

here torque due to weight is given as



now torque due to applied force of muscle


now by torque balance we will have


so here the magnitude of m will be 173 N
We already know the formula:
Voltage = Current * Resistance
In the given question, there are numerous information's that are already given.
Current = 6.2 A
Resistance = 18 ohms
Then
Voltage = 6.2 * 18 Volts
= 111.6 Volt
So, the voltage in the circuit will be 111.6 volts. I hope it helps you.
Answer:
Selenium is a semiconductor
Explanation:
Selenium is a semiconductor.
Elements in the column IV and VI of the periodic table are referred to as Semiconductor.
Selenium lies in the column VI along with Tellurium
Some other elements of the column IV are silicon, germanium, and tin
KE = 1/2 mv^2 is the relationship betwee mass and kinetic energy