Answer:
A - Watt
Explanation:
Watt is the unit of electrical power in a metric system, expressed in terms of energy per second, equal to the work done at a rate of 1 joule per second is
power formula is P = V × I,
where V is the voltage in a circuit
I is the current flowing through that circuit.
In the SI (metric) system, the units of power are watts.
Answer:
F = 309.24 N
Explanation:
Given that,
Charge on a strom cloud, q₁ = 0.055 C
The charge gained by the top of a tree, q₂ = -0.006 C
The cloud moves to 98 meters above the tree.
We need to find the amount of force between the cloud and the tree. The electrical force between two charges is given by :
So, the force between the cloud and the tree is equal to 309.24 N.
Complete question is The frequency of the fundamental of the guitar string is 320 Hz. At what speed c do waves move along that string? wavelength is 40 cm.
Answer:
128 m/s
Explanation:
In case where fundamental frequency is given, the speed with waves travel along the string can be calculated using the following formula:
v = f (2L) where L is the length of the string (L = λ/2)
⇒v= f λ
f = 320 Hz (given)
λ = 40 cm = 0.40 m
Substitute the values:
⇒ v = 320 Hz × 0.40 m= 128 m/s
