Answer:
a). 6 seconds
b). 12 seconds
c). 176.4 meters
Explanation:
a). Equation to be applied to calculate the time taken by the rocket to reach at the peak height,
v = u - gt
where v = final velocity
u = initial velocity = 58.8 m per sec
g = gravitational pull = 9.8 m per sec²
t = duration of the flight
At the peak height,
v = 0
Therefore, 0 = 58.8 - (9.8)(t)
t = ![\frac{58.8}{9.8}](https://tex.z-dn.net/?f=%5Cfrac%7B58.8%7D%7B9.8%7D)
= 6 seconds
b). Total time of flight = 2(Time taken to go up)
= 2×6
= 12 sec
c). Formula to get the peak height is,
![h=ut-\frac{1}{2}gt^2](https://tex.z-dn.net/?f=h%3Dut-%5Cfrac%7B1%7D%7B2%7Dgt%5E2)
h = (58.8)6 - ![\frac{1}{2}(9.8)(6)^2](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%289.8%29%286%29%5E2)
= 352.8 - 176.4
= 176.4 meters
Out of the choices given, the best choice to explain the direction of the moving force of air is from area o high pressure to areas of low pressure. The correct answer is B.
The total number of lamps is mathematically given as
N=24
<h3>What is the t
otal number of
lamps?</h3>
Question Parameters:
How many 60-watt lamps could be connected in parallel on a 15-amp, 120-volt
Generally, the equation for the Power is mathematically given as
P=IV
Therefore
I=P/v
I=60/120
I=0.5A
Since the system does not exceed 80% of the rating
NI=I'(0.8)
N=15*0.8/0.5
N=24
In conclusion, the total number of lamps is
N=24
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A solution with a concentration of hydrogen ions higher than 10-7mol/L is acidic, and a solution with a lower concentration is alkaline (another way to say basic). Using the formula, pH=-log[H+], a pH of 7 is neutral, a pH less than 7 is acidic, and a pH greater than 7 is basic.