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lina2011 [118]
3 years ago
13

A hunter points his rifle directly at a coconut that she wishes to shoot off a tree. It so happens that the coconut falls from t

he tree at the exact instant the hunter pulls the trigger. Consequently, A. The bullet passes above the coconut B. The bullet hits the coconut C. The bullet passes beneath the coconut
Physics
1 answer:
Advocard [28]3 years ago
8 0

Answer:

B. The bullet hits the coconut

Explanation:

The hunter fired a bullet and hit the coconut he wanted to drop from the tree. It may not seem so, since the coconut fell as soon as the hunter pulled the trigger, but a rifle bullet has a speed equal to 3,500 km / h, which is too fast for our eyes to be able to observe the moment when the bullet hit the coconut.

However, it would be quite a coincidence that exactly the coconut that the hunter aimed for fell naturally without the influence of the bullet. Because of this, we can say that the hunter hit the coconut.

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Explanation:

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A 23.8 kg space rock is pushed with a force and accelerates at 8.97 m/s/s. How much force was applied?
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2 years ago
A child, hunting for his favorite wooden horse, is running on the ground around the edge of a stationary merry-go-round. The ang
olga55 [171]

Answer:

9.22 s

Explanation:

One-quarter of a turn away is 1/4 of 2π, or π/2 which is approximately 1.57 rad

Let t (seconds) be the time it takes for the child to catch up with the horse. We would have the following equation of motion for the child and the horse:

For the child: s_c = \omega_ct = 0.233t

For the horse: s_h = s_0 + a_ht^2/2 = 1.57 + 0.0136t^2/2 = 1.57 + 0.0068t^2

For the child to catch up with the horse, they must cover the same angular distance within the same time t:

s_c = s_h

0.233t = 1.57 + 0.0068t^2

0.0068t^2 - 0.233t + 1.57 = 0

t= \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

t= \frac{0.233\pm \sqrt{(-0.233)^2 - 4*(0.0068)*(1.57)}}{2*(0.0068)}

t= \frac{0.233\pm0.11}{0.0136}

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Since we are looking for the shortest time we will pick t = 9.22 s

6 0
3 years ago
Which sentences describe the cyclone device?
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Answer:

✓ A cyclone device accumulates fine particulates from the air by making a dirty air stream flow in a spiral path inside a  cylindrical chamber.

✘ It consists of several long and narrow fabric filter bags suspended upside-down in a large  enclosure.

✓ When dirty air enters the chamber, the larger particulates strike the chamber wall and fall into a conical dust  hopper at the bottom.

✘ Fans blow dirt-filled air upward from the bottom of the enclosure, trapping dirt particles inside the  filter bags and releasing clean air from the top.

✓ The top of the chamber has an outlet that lets out cleaned air.

Basically, any of these choices that have the word "filter" are wrong. The point of the cyclone device is to separate the particles without the use of filters. You can tell the right answers based on the picture attached below.

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2 years ago
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