Explanation:
Energy can be converted from one form to another. Examples: Gasoline (chemical) is put into our cars, and with the help of electrical energy from a battery, provides mechanical (kinetic) energy. ... Similarly, purchased electricity goes into an electric bulb and is converted to visible light and heat energy.
Explanation :
(1) No. of jumping jacks, 
time, 
So, frequency is 


(2) The quarter spins 10 times every seconds
So, frequency 
and the period of one cycle is, 

(3) mass of block, 
force constant of spring, 
Time period of oscillations is given by :


So, 
Frequency, 


Answer:
D. The circulatory system transports oxygen that the respiratory system brings into the body.
Explanation:
the first two answers either refer to carbon dioxide as beneficial and necessary to the body(it sometimes is but not in this case)
the answer choice c refers to oxygen being transferred directly to the heart. This is also incorrect.
the only proper answer to this question is answer choice d.
The concept needed to solve this problem is average power dissipated by a wave on a string. This expression ca be defined as

Here,
= Linear mass density of the string
Angular frequency of the wave on the string
A = Amplitude of the wave
v = Speed of the wave
At the same time each of this terms have its own definition, i.e,
Here T is the Period
For the linear mass density we have that

And the angular frequency can be written as

Replacing this terms and the first equation we have that



PART A ) Replacing our values here we have that


PART B) The new amplitude A' that is half ot the wavelength of the wave is


Replacing at the equation of power we have that

