Underhand serve is a type of volleyball serve in which a player holds the ball with one hand and swings the other hand in an arc motion, striking under the ball with a fist to put it into play. An underhand serve is the most common serve for beginners.
It will act upon a buoyant force on the magnitude of which is equal to weight of the fluid
Back emf is 85.9 V.
<u>Explanation:</u>
Given-
Resistance, R = 3.75Ω
Current, I = 9.1 A
Supply Voltage, V = 120 V
Back emf = ?
Assumption - There is no effects of inductance.
A motor will have a back emf that opposes the supply voltage, as the motor speeds up the back emf increases and has the effect that the difference between the supply voltage and the back emf is what causes the current to flow through the armature resistance.
So if 9.1 A flows through the resistance of 3.75Ω then by Ohms law,
The voltage across the resistance would be
v = I x R
= 9.1 x 3.75
= 34.125 volts
We know,
supply voltage = back emf + voltage across the resistance
By plugging in the values,
120 V = back emf + 34.125 V
Back emf = 120 - 34.125
= 85.9 Volts
Therefore, back emf is 85.9 V.
Answer:
Object 1.
Explanation:
Given that,
Force applied = 100 N
The spring constant of object 1 = 100 N/m
The spring constant of object 2 = 200 N/m
Using Hooke's law, we find the force applied on the object to stretch.
For object 1,
F₁ = k₁x₁
For object 2,
F₂ = k₂x₂
Object 1 stretches 1 m and object 2 stretches 0.5 m. Hence, object 1 stretches furthur.