Explanation:
As the given data is as follows.
m = 6.51 kg, g = 9.8
, h = 66.8 m
mass of water (M) = 0.68 kg, Specific heat of water = 4200 

According to the given situation, the decrease in potential energy of mass will be equal to heat energy gained by water.
Therefore,
mgh = 

4261.7064 = 
1.492 =
- 15
So, 
= 
Therefore, we can conclude that rise in temperature will be
.
Answer:
Velocity, v = 0.239 m/s
Explanation:
Given that,
The distance between two consecutive nodes of a standing wave is 20.9 cm = 0.209 m
The hand generating the pulses moves up and down through a complete cycle 2.57 times every 4.47 s.
For a standing wave, the distance between two consecutive nodes is equal to half of the wavelength.

Frequency is number of cycles per unit time.

Now we can find the velocity of the wave.
Velocity = frequency × wavelength
v = 0.574 × 0.418
v = 0.239 m/s
So, the velocity of the wave is 0.239 m/s.
Answer:
<h2>A communication system comprising a set of non-geostationary satellites provides communication links between ground stations and terminals, a communication link from a particular station via a satellite terminating at associated terminals in a limited geographical era including the station and providing a.</h2>
Explanation:
<h2>Hopes this helps. Mark as brainlest plz!</h2>