3 years ago

A 4 kg block is hanging from the ceiling by two strings. The tension in one string is 31 N and

Physics

1 answer:

Vlad1618 [11]3 years ago

4 0

Oh my gosh I’m so sorry to hear about the new acc and stuff I like that you have 555 to north and I don’t know

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A 59.3 kg diver jumps off a board

ser-zykov [4K]

The board is 2.50m high.

Why?

We can calculate how high was the board applying the Law of Conservation of Mechanical Energy. This Law states that the mechanical energy (kinematic and potential) will be conserved during the motion.

It can be described with the following formula:

$E_{M_{1}}=E_{M_{2}}\\\\PE_{1}+KE_{1}=PE_{2}+KE_{2}$

$PE=m*g*h\\KE=\frac{1}{2}m*v^{2}$

At the top of the boar, the kinetic energy is equal to 0.

At the water, the potential energy is equal to 0.

So,

$PE_{1}=KE_{2}\\\\m*g*h=1450J\\\\59.3kg*9.8\frac{m}{s^{2}}*h=1450J\\ \\h=\frac{1450J}{59.3kg*9.8\frac{m}{s^{2}}}=2.50m$

Hence, we have that the board is 2.50m high.

Have a nice day!

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4 years ago

Which of the following statements best explains why genetic variation is important to the survival of a population?

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Suppose the B string on a guitar is 24" long and vibrates with a frequency of about 247 Hz. You place your finger on the 5th fre

Rudiy27

Answer:

b. E (about 329 Hz)

Explanation:

Given data:

Initial length of the string l1= 24 in

initial frequency f1= 247 Hz

changed length l2= 18 in

Then we have to find the changed frequency f2= ?

We already now that

frequency f ∝ 1/length of the string l

therefore,

$\frac{f_1}{f_2} =\frac{l_1}{l_2}$

⇒ ${f_2}=\frac{l_1}{l_2}\times{f_1}$

⇒ ${f_2}=\frac{24}{18}\times{247}$

⇒ ${f_2}=329.33 Hz$

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The outer planets _____.all have rings

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Are found outside the asteroid belt. Hope it helps!

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Which type of experiment involves changing only one variable at a time

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Controlled Experiment

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