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3 years ago

6

A box moves 1000 m horizontally as a force F 2000 N is applied downward. What is the work done on the box by F during the displa

cement?

1 answer:

stiks02 [169]3 years ago

5 0

Answer:

D. OJ

Explanation:

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(a) What is the angular speed ω about the polar axis of a point on Earth's surface at a latitude of 55° N? (Earth rotates about

Vaselesa [24]

Answer

given,

radius of earth = 6370 km

earths latitude = 55° N

time = 24 hour = 86400 s

angular speed = ω

a) $\omega = \dfrac{2\pi}{T}$

$\omega = \dfrac{2\pi}{86400}$

$\omega = 7.27 \times 10^{-5}rad/s$

b) $v = r\omega cos\theta$

$v = 6370\times 7.27 \times 10^{-5}\times cos 55^0$

$v = 266 m/s$

c) ω at equator

$\omega = \dfrac{2\pi}{T}$

$\omega = \dfrac{2\pi}{86400}$

$\omega = 7.27 \times 10^{-5}rad/s$

d) $v = r\omega cos\theta$

$v = 6370\times 7.27 \times 10^{-5}\times cos 0^0$

$v = 463 m/s$

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3 years ago

In the visible spectra of stars, absorption lines of hydrogen are produced when atoms are excited from n = 2 to higher levels (t

grigory [225]

Answer:

3. relatively high temperature, about 10,000 K, so that significant numbers of electrons are excited from the ground state, n = 1, to the first excited state, n = 2, but not too many of them have been ejected completely from the atoms

Explanation:

If hydrogen absorption lines are very strong in the visible spectrum of a particular star that means the population of electron in n = 2 is very high so on being exited they absorb radiation in Balmer series and give rise to absorption spectrum. The average temperature required to excite electron in hydrogen atom from n=1 to n = 2 is 10000K .

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3 years ago

What is the kinetic energy of a 14kg object traveling at 10m/s

Sauron [17]

Answer:

Explanation:

kinetic energy=1/2*mass*velocity^2

=1/2*14kg*10^2

=7*100

=700 joule

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2 years ago

Round the following off to required number of significant figures.

Stells [14]

Answer:

140

hope this helps

have a good day :)

Explanation:

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2 years ago

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Now assume that the stream flows east at 4.0 m/s. draw the vectors v⃗ w, representing the velocity of the stream, and v⃗ tot, re

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Remember that the total velocity of the motion is the vector sum of the velocity you would have in still water and the stream. Always place the vectors carefully to be able to come up with an accurate sum vector.

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3 years ago