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posledela
3 years ago
13

She falls out of a plane 2 miles up, equipped with a parachute as well as a backup parachute, they both fail. How much time does

it take for her to hit the surface?
Physics
1 answer:
Minchanka [31]3 years ago
8 0
D=Vot+1/2at^2

Vot= 0 since there is no initial velocity in the y direction.

a=gravitational acceleration which is - 32 ft/s^2 in imperial units I believe.

She travels a distance of -2 miles, so

-2 miles= 1/2(-32ft/s^2)t^2

t= square root((- 4 miles)/(-32ft/s^2))

I don't know imperial units, but convert miles to feet then solve for t.
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Which unit would be most suitable for its scale?
Cloud [144]

Answer:

Mm, thats the answer trust me men

5 0
3 years ago
Figure of vernier caliper showing 15 number of division on vernier scale and 12 cm on the main scale
tatuchka [14]

15 number of division on Vernier scale and 12 cm on the main scale means 13.2 cm of the object thickness.

<h3>What is value of 15 division of Vernier scale generally?</h3>

A Vernier scale has 10 divisions and the total length of these 10 divisions is equal to the length of 9 divisions of the main scale that equals to 9 mm so in this way 15 number of division on Vernier scale means 14 divisions on the main scale which is equals to 14 mm and we know that there is 12 cm on the main scale so by adding 12 cm and 14 mm we get the 13.2 cm reading of the object thickness. Vernier caliper is a measuring device that comprise of a main scale and a sliding jaw with an attached Vernier.

So we can conclude that 15 number of division on Vernier scale and 12 cm on the main scale means 13.2 cm of the object thickness.

Learn more about Vernier here: brainly.com/question/24694454

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5 0
2 years ago
The AC voltage source supplies an rms voltage of 146 V at frequency f. The circuit has R = 110 Ω, XL = 210 Ω, and XC = 110 Ω. At
Ann [662]

Answer:

1.03A

Explanation:

For computing the magnitude of the current in the circuit we need to do the following calculations

LCR circuit impedance

Z = \sqrt{R^2 + (X_L - X_c)^2} \\\\ = \sqrt{110^2 + (210 - 110)^2}

= 148.7Ω

Now the phase angle is

\phi = tan^{-1} (\frac{X_L - X_C}{R}) \\\\ = tan^{-1} (\frac{210 - 110}{110})\\\\ = 42.3^{\circ}

Now the rms current flowing in the circuit is

I_{rms} = \frac{V_{rms}}{Z} \\\\ = \frac{146}{148.7}

= 0.98 A

The current flowing in the circuit is

I = I_{rms}\sqrt{2} \\\\ = (0.98) (1.414)

= 1.39 A

And, finally, the current across the generator is

I'= I cos \phi

= (1.39) cos 42.3^{\circ}

= 1.03A

Hence, the magnitude of the circuit current is 1.03A

6 0
3 years ago
A helicopter blade spins at exactly 180 revolutions per minute. Its tip is 10.00 m from the center of rotation. What is its aver
olya-2409 [2.1K]

Answer:

5.8E-3m/s

Explanation:

Using

V= d/t

V= velocity

d= distance

t= time

But d= 2πr

But 180rev= 1min

So 1min/180= 60s/180

So

Vavr= 2π(10m)/180*60

=5.8E-3m/s

3 0
3 years ago
OF these nonmetals, which one is likely to be the least reactive? nitrogen (N) phosphorous (P) sulfur (S) oxygen (O)
kupik [55]
Reactivity increases upward and decreases leftward for these nonmetals. Thus oxygen would be the most reactive since it is the most rightward and upward.
4 0
3 years ago
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