Answer:
unit =1.83
Explanation:
The cooling load is due to people, lights, and heat transfer through the walls and the windows so. The total cooling load of the room is determined from
(Equation 1) Q cooling = Q lights + Q people + Q heat gain
there fore
Q cooling = 10 x 100 W = 1 KW
Q people = 40 x 360 KJ/h = 4 KW
Q heat gain = 15.000 kJ/h = 4.17 KW
we replace the values in Equation 1
Q cooling = Q lights + Q people + Q heat gain
Q cooling = 1 + 4 +4.17
Q cooling = 9.17 KW
Thus the number of air — conditioning units required is
9.17 KW /5 KW unit =1.83
Answer:
An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities inelastic collisions.
Explanation:
Suppose two similar trolleys are traveling toward each other with equal speed. They collide, bouncing off each other with no loss in speed. This collision is perfectly elastic because no energy has been lost. In reality, examples of perfectly elastic collisions are not part of our everyday experience. Some collisions between atoms in gases are examples of perfectly elastic collisions. However, there are some examples of collisions in mechanics where the energy lost can be negligible. These collisions can be considered elastic, even though they are not perfectly elastic. Collisions of rigid billiard balls or the balls in Newton's cradle are two such examples.
Answer
NB:
- speed, U is measure in m/s
- acceleration, a is measured in m/s²
-time t in seconds , s
Therefore conversation must be made
Speed U = 20km/hrs
=20km÷1hr
But 20km= 20×1000=20000m
1hr= 1×60min×60sec=3600s
U=20000÷3600=5.56m/s
a=30km/hrs
=30km÷1hr
But 30km=30×1000=30000
1hr=3600s
a=30000÷3600=8.33m/s²
From the equation of motion
S=Ut + ½ at².
Where s= distance
S = 5.56m/s × 20s + ½(8.33m/s²)(20s)²
S = 1777.3m