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3 years ago

What outside force prevents the planets from moving in a straight line into space

2 answers:

6 0

Ah hah ! That's the gravitational force between the sun
and each planet.

One of the many things that would be different without
gravity is: There would be no orbits.

Harrizon [31]3 years ago

6 0

Gravity is what causes the planets to stay in there revolution, and what causes them to not drift into space. hope I helped:)

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A photon of wavelength 192 nm strikes an aluminum surface along a line perpendicular to the surface and releases a photoelectron

alex41 [277]

Answer:

$KE=3.529\times10^{−27}\ J$

Explanation:

Given that

Wavelength λ=192 nm

So energy of photon,E

$E=\dfrac{hC}{\lambda }$

Now by putting the values

$h=6.6\times 10^{-34}\ m^2.kg/s$

$C=3\times 10^{8}\ m/s$

$E=\dfrac{6.6\times 10^{-34}\times 3\times 10^{8}}{192\times 10^{-9} }$

$E=1.03\times 10^{-18} J$

We know that

Kinetic energy given as

$KE=\dfrac{P^2}{2m}$

$KE=\dfrac{E^2}{2mC^2}$

$KE=\dfrac{(1.03\times 10^{-18})^2}{2\times 1.67\times 10^{-27}(3\times 10^8)^2}$

$KE=3.529\times10^{−27}\ J$

5 0

3 years ago

Two horses on opposite sides of a narrow stream are pulling a barge up the stream. Each hors pulls with a force of 720N. The rop

Sonja [21]

For the answer to the question above, each horse's force forms a right angle triangle with the barge and subtends an angle of 60/2 = 30°. The resultant in the direction of the barge's motion is:
Fx = Fcos(∅)
We can multiply this by 2 to find the resultant of both horses.
Fx = 2Fcos(∅)
Fx = 2 x 720cos(30)
Fx = 1247 N

8 0

3 years ago

A cheetah can accelerate at 4.5 m/s from rest to a speed of 30.0 m/s. Calculatethe distance

anzhelika [568]

Answer:

d= 100m

Explanation:

Cheetah kinematic

The cheetah moves with uniformly accelerated movement, and the formulas that describe this movement are:

d= v₀*t + (1/2)*a*t² Formula (1)

vf²=v₀²+2*a*d Formula (2)

vf=v₀+a*t Formula (3)

Where:

d:distance in meters (m)

v₀: initial speed in m/s

vf: final speed in m/s

a: acceleration in m/s²

t: time in seconds (s)

Known Data

v₀ =0

a = 4.5 m/s²

vf= 30 m/s.

Problem development

We apply the formula (2) that has known data to calculate the distance :

vf²=v₀²+2*a*d

(30)²= 0 + 2* 4.5* d

$d= \frac{900}{9}$

d= 100m

8 0

3 years ago

A boy with a mass of 66 kg sits on a see-saw, 1.2 meters from the fulcrum. How far from the fulcrum will a 44-kg girl need to si

dusya [7]

<span>610 kg far from the fulcrum a 44-kg girl need to sit to balance the boy. </span>

3 0

3 years ago

include at least five action items that you and your family will do to conserve energy. PLEASE I NEED HELP! THIS QUESTION IS WOR

wariber [46]

Taking shorter showers, turning off the lights when you aren't in a room, use energy efficient lightbulbs like LED's, use the air conditioning only when you really need it, and use the heat less in the winter.

7 0

3 years ago

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