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lozanna [386]
2 years ago
13

Mr. Barcena reached a top speed of 5m/s in 2 seconds from rest, what was his average acceleration including units?

Physics
1 answer:
sashaice [31]2 years ago
4 0

Answer:

Explanation:

The equation for acceleration is

a=\frac{v_f-v_0}{t} where vf is the final velocity and v0 is the initial velocity. Filling in:

a=\frac{5-0}{2} so

a = 2.5 m/s/s

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The second runner must run 3.3m/s. If the leading runner is 1.5 seconds ahead and there are 30m left, the second runner would need to run slightly faster than the lead in order to finish at the same time. To calculate this I did 30/1.5 which gave me 0.05. I added this onto the speed of the lead runner to get 3.3m/s :)
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The "big bang" refers to the origin of:
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The answer is E. Our Universe
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suppose that you want to build a machine to perform simple tasks. why must you understand all about forces to complete your miss
mixas84 [53]

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CAUSE YPU WANT TO

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PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!
emmasim [6.3K]

2+.5 + 2.5 all over 3

5/3

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Championship swimmers take about 22 s and about 30 arm strokes to move through the water in a 50 m freestyle race.The swimmer's
Tasya [4]

Answer:

4400 Joules

73.33 Joules

25.9325 Joules

Explanation:

P = Power = 800 W

t = Time = 22 s

F = Force

r = Radius of arm = 90 cm

Energy

E=P\times t\\\Rightarrow E=800\times 22\\\Rightarrow E=17600\ J

As the efficiency is 25%

E=0.25\times 17600\\\Rightarrow E=4400\ J

Energy used in the race is 4400 Joules

Half of the energy is used in the arm

E=\frac{4400}{2}=2200\ J

So, per stroke of paddle

E=\frac{2200}{30}=73.33\ J

The energy expenditure per arm stroke is 73.33 Joules

Displacement will be the half of the perimeter of the circle

s=\frac{1}{2}\times 2\pi r\\\Rightarrow s=\frac{1}{2}\times 2\pi 0.9\\\Rightarrow s=2.82743

Work done

W=F\times s\\\Rightarrow F=\frac{W}{s}\\\Rightarrow F=\frac{73.33}{2.82743}\\\Rightarrow W=25.9352\ J

The average force of the hand on the water is 25.9325 Joules

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