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4 years ago

most responsible for the formation of a star is most responsible for the formation of a star is blank Force

1 answer:

5 0

That would be gravitational force. Check out creation.com. Search up "star-formation" in their search bar. Hope this helped.

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A 1000 kg weather rocket is launched straight up.The rocket motor provides a constant acceleration for 16 s, then the motor stop

Novay_Z [31]

Go with it hope this helps

6 0

3 years ago

A box of mass 20kg is pulled up an inclined plane by a force of 285N. Given that the value of the incline angle is 30 degrees an

docker41 [41]

Given :

Mass of box , m = 250 kg.

Force applied , F = 285 N.

The value of the incline angle is 30°.

the coefficient of dynamic friction is $\mu=0.72$ .

To Find :

The speed with which the box is moving with, assuming it takes 4 seconds to reach the top of the incline.

Solution :

Net force applied in box is :

$F=285 - mgsin\ \theta - \mu mg cos \ \theta\\ \\F=285-mg( sin \ \theta - \mu cos\ \theta)\\\\F=285 - 20\times 10( \dfrac{1}{2}+0.72\times \dfrac{\sqrt{3}}{2})\\\\F=60.29\ N$

Acceleration , $a=\dfrac{F}{m}=\dfrac{60.29}{20}=3.01\ m/s^2$ .

By equation of motion :

$v=u+at\\\\v=0+3.01\times 4\\\\v=12.04\ m/s$

Therefore, the speed of box is 12.04 m/s.

Hence, this is the required solution.

6 0

3 years ago

Which term describes the wave phenomenon in the image

aleksley [76]

Answer: (Next time put the Image but I know what u talkin bout)

wave changes its path from its initial direction so this phenomenon is known as Refraction of wave

Explanation:

When wave travels from one medium to other medium the due to change in the speed of the wave propagation it deviates from its initial path.

The deviation of the wave from its initial path is known as refraction of wave

Here we can see that wave incident on medium 1 with some angle with the boundary

Then it enters into other medium and then travels in other direction

So here wave changes its path from its initial direction so this phenomenon is known as Refraction of wave

4 0

3 years ago

A bridge that was 5.0 m long has been washed out by the rain several days ago. How fast must a car be going to successfully jump

amid [387]

Answer:

Speed, v = 7.83 m/s

Explanation:

It is given that,

Length of the bridge, l = 5 m

The road on the far side is 2.0 m lower than the road on this side, x = 2 m

The horizontal distance covered by the car is 5 meters and the vertical distance covered by the car is 2 meters.

Initial speed of the car, u = 0

Let t is the time taken by the car . Using the second equation of motion as :

For vertical distance :

$s=ut+\dfrac{1}{2}gt^2$

$t=\sqrt{\dfrac{2\times 2}{9.8}}=0.638\ s$

Let v is the velocity to jump the stream. It is given by :

Horizontal distance, d = 5 m

$v=\dfrac{5\ m}{0.638\ s}$

v = 7.83 m/s

So, the car should travel with a speed of 7.83 m/s. Hence, this is the required solution.

8 0

4 years ago

If you were to drop a rock from a tall building, assuming that it had not yet hit the ground, and neglecting air resistance. Wha

Marizza181 [45]

Answer:

320m

Explanation:

The vertical displacement is given by:

$y_0-y=\frac{1}{2}gt^2-v_0t$

Assuming v₀=0, t=8:

$y_0-y=\frac{10}{2} \times 8^2 + 0\times 8 = 320$

5 0

4 years ago