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3 years ago

What are the frequencies of EM spectrum

1 answer:

3 0

The EM spectrum has no limits. Any frequency you can imagine
is the frequency of some electromagnetic radiation somewhere.

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A stone is dropped at t = 0. A second stone, with twice the mass of the first, is dropped from the same point at t = 181 ms. How

lara [203]

Answer:

the center of mass is 316,670m bellow the release point.

Explanation:

First, we must find the distance at which the objects are in time t = 360s

We will use the formula for vertical distance in free fall

$h=v_{0}t+\frac{1}{2} gt^2$

$v_{0}$ is the initial velocity, is 0 for both stones since they were just dropped.

g is acceleration of gravity and t is time ( $g=9.81m/s^2$ )

At $t=360s$ the first stone has been falling for the entire 360 seconds, its position h1 is:

$h_{1}=\frac{1}{2} (9.82m/s^2)(360s^2)=635,688m$

And at 360 seconds the second stone has been fallin for $t= 360s -181 s = 179s$ , so its position h2 is:

$h_{2}=\frac{1}{2} (9.81m/s^2)(179)^2=157,161.1m$

And finally using the equation for the center of mass:

$CM=\frac{m_{1}h_{1}+m_{2}h_{2}}{m_{1}+m_{2}}$

We know that the mass of the second stone is twice the mass of the first stone so:

$m_{1}=m\\m_{2}=2m$

replacing these values in the equation for the center of mass

$CM=\frac{mh_{1}+2mh_{2}}{m+2m}$

$CM=\frac{m(h_{1}+2h_{2})}{3m}=\frac{h_{1}+2h_{2}}{3}$

Finally, replacing the values we found fot h1 and h2:

$CM=\frac{635,688m+2(157,161.1m)}{3}=316,670m$

the center of mass is 316,670m bellow the release point.

8 0

4 years ago

Which of the three types of equations follows the law of conservation of mass?

ArbitrLikvidat [17]

Answer:

BE MORE DESCRIPTIVE

Explanation:

8 0

3 years ago

A roofer needs to get shingles onto a roof. Pulling the shingles up manually uses 1,549 N or force. The roofer decides to use a

joja [24]

Answer:

Mechanical advantage of pulleys = 3.47 (Approx)

Explanation:

Given:

Manual force = 1,549 N

Pulleys force = 446 N

Find:

Mechanical advantage of pulleys

Computation:

Mechanical advantage of pulleys = Manual force / Pulleys force

Mechanical advantage of pulleys = 1,549 / 446

Mechanical advantage of pulleys = 3.4730

Mechanical advantage of pulleys = 3.47 (Approx)

3 0

4 years ago

Why is genetic stability important?

kap26 [50]

Answer: DNA polymerase and DNA ligase also are important in DNA replication. In addition to maintaining the integrity of DNA sequences by DNA repair, an accurate duplication of DNA is a prerequisite for all cell divisions.

7 0

3 years ago

Determine the voltage of source v2 in order for a 50a current to be delivered to the 0.5 ohm load resistor.

USPshnik [31]

<u>Answer</u>

25 Volts

<u>Explanation</u>

Ohm's law states that the current flowing though a fixed resistor is directly proportional to the voltage drop across it.

V ∝ I

V = RI Where R is the resistance.

V = 0.5 × 50

= 25 V

5 0

3 years ago