Answer:
Part a)

Part b)

Explanation:
Part a)
Energy required to raise the temperature of water from 17.8 degree C to 21.6 degree C is given by formula

here we know that
Here the volume of the water is given as

now the mass of water is


now the heat required is


Part b)
As we know that power is supplied at

so here we know

so here we have




Answer:
h = 206.4 m
range = 515.9 m
Explanation:
from the question we are given the following:
initial velocity (u) = 75 m/s
angle above surface = 58 degrees
acceleration due to gravity (g) = 9.8 m/s^{2}
find the maximum height (h) and the horizontal distance
maximum height (h) = 
h = 
h = 206.4 m
the horizontal distance here is the range
range = 
range = 
range = 515.9 m
Answer:
<h2>138 N</h2>
Explanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 69 × 2
We have the final answer as
<h3>138 N</h3>
Hope this helps you
When speed slows down you have kinetic energy.
Given
The projectile is in air for a time of t=8 sec
To find
The time it takes to reach the highest point
Explanation
A projectile moves up to the highest point and then again moves down following a parabolic path.
So it will reach the highest point at a time half the time it requires to follow teh parabolic path.
The time taken to reach the highest point is 4 sec
Conclusion
The time taken is 4 sec.