Answer:
Net capacitance
=
let net capacitance be R
1/R = 1/10+1/10
1/R=2/10
1/R=1/5
cross mutiply
R=5
the net capacitance is 5ohms
Explanation:
a) Hammer hits a nail
Action: Hammer hitting the nail
Reaction: Nail Hitting the hammer.
B) . Earth's gravity pulls down on a book.
Action: Earth pull downward on the book.
Reaction: The Book pull's the Earth Upward.
C) A helicopter blade pushes air downward.
Action: Blade push air downward
Reaction: The force in pushes the helicopter upward.
Answer:
It takes 266 seconds to melt the ice.
Explanation:
Given data
- Power of the microwave oven (P): 125 Watt
- Heat supplied to the ice (Q): 33,200 Joule
- Time for the melting (t): to be determined
In order to determine the time required to melt the ice, we can use the following expression.
P = Q/t
t = Q / P = 33,200 J/ 125 W = 266 s
It takes 266 seconds to melt the ice.
To solve this problem it is necessary to apply the concepts related to Sound Intensity. The unit most used in the logarithmic scale is the decibel and mathematically this is expressed as

Where,
= Sound intensity level in decibels
I = Acoustic intensity on the linear scale
Hearing threshold
According to the values, the total intensity is 32 times the linear intensity and the value in decibels is 83dB
So:




Therefore the sound intensity due to one person is 67.948dB