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UkoKoshka [18]
3 years ago
8

5. How fast does a 50 gram arrow need to travel to have 40 Joules of kinetic energy?​

Physics
1 answer:
qwelly [4]3 years ago
7 0

Answer: v = 40 m/5

Explanation:

40 J = 1/2 (105) v^2

1600 = v^2

v = 40 m/5

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What is the force required to stop a 20 kg man traveling at 12.3 m/s East in 0.9 s? *Round to TWO decimal points and include you
abruzzese [7]

F = ma

We have mass = 20kg

And we need to solve for acceleration

So acceleration is change in velocity over time, in this case we have one velocity and we can assume the man started from rest so

12.3 / 0.9 = a

a = 13.6667

Now we can plug that into F = ma

F = (20)(13.6667)

F = 273.334

Rounding

F = 273.33

Now he is traveling east so we need a force towards the rest, or in the opposite direction to stop his motion.

If we assume east is the positive direction then we need a force of

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4 0
4 years ago
A 0.954-kg toy car is powered by three D cells (4.50 V total) connected directly to a small DC motor. The car has an effective e
Natasha2012 [34]

Answer:

0.06 A

Explanation:

We have given mass =0.954 kg

velocity =1.27 m/sec

efficiency =0.361 the output kinetic energy of the motor KE=\frac{1}{2}mv^2=\frac{1}{2}\times 0.954\times 1.27^2=0.769\ J

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so input to the motor = output/efficiency

so input to the motor = \frac{0.769}{0.361}=2.1301

we know that P=\frac{E}{T} where E is energy and T is time so P=\frac{2.1301}{7.88}=0.2703W

We know that power P=VI we have given V=4.5 VOLT

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3 0
3 years ago
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Four model rockets are launched in a field. The mass of each rocket and the net force acting on it when it launches are given in
kondor19780726 [428]

Answer:

Rocket 2 has highest acceleration.

Explanation:

Net force,

F = mass (m) × acceleration (a)

We have,

m₁ = 4.25 kg and F = 120 N

a_1=\dfrac{F_1}{m_1}\\\\a_1=\dfrac{120}{4.25}\\\\a_1=28.23\ m/s^2

m₂ = 3.25 kg, F₂ = 120 N

a_2=\dfrac{F_2}{m_2}\\\\a_2=\dfrac{120}{3.25}\\\\a_2=36.92\ m/s^2

m₃ = 5.5 kg, F₃ = 120 N

a_3=\dfrac{F_3}{m_3}\\\\a_3=\dfrac{120}{5.5}\\\\a_3=21.81\ m/s^2

m₄ = 4.5 kg, F₄ = 120 N

a_4=\dfrac{F_4}{m_4}\\\\a_4=\dfrac{120}{4.5}\\\\a_4=26.66\ m/s^2

Hence, it can be seen that the highest acceleration is of rocket 2.

7 0
3 years ago
Which is the function of a nucleus within a eukaryotic cell?
DerKrebs [107]
ANSWER
D) store genetic information that provides instructions for the cell
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' A ' is the graph that shows it.

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