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aleksley [76]
2 years ago
13

Which of the following best demonstrates the effect of static friction? A. A person pushing a couch and it slowly sliding across

a floor B. A person moving a ball through a stream of water C. A person dropping a ball to the ground. D. A person pushing a couch without being able to move it
Physics
1 answer:
Allisa [31]2 years ago
5 0
<span> B. A person moving a ball through a stream of water</span>
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a projectile is lunched with an initial speed of 60.0mm/s at an angle of 30.0° above the horizontal.The projectile lands on a hi
alexandr402 [8]

Answer:

52 mm/s (approximately)

Explanation:

Given:

Initial speed of the projectile is, u=60.0\ mm/s

Angle of projection is, \theta=30.0\°

Time taken to land on the hill is, t=4\ s

In a projectile motion, there is acceleration only in the vertical direction which is equal to acceleration due to gravity acting vertically downward. There is no acceleration in the horizontal direction.

So, the velocity in the horizontal direction always remains the same.

The horizontal component of initial velocity is given as:

u_x=u\cos\theta\\u_x=60\times \cos(30)\\u_x=30\sqrt3\approx52\ mm/s

Now, the velocity in the vertical direction goes on decreasing and becomes 0 at the highest point of the trajectory. So, at the highest point, only horizontal component acts.

Therefore, the projectile's velocity at the highest point of its trajectory is equal to the horizontal component of initial velocity and thus is equal to 52 mm/s.

6 0
3 years ago
Which statements describe the relationship between the area and the biodiversity of an ecosystem? Check all that apply. Large ec
snow_tiger [21]

Answer:

A large area of a forest will likely have higher biodiversity than a smaller area of the same forest.

A half acre of rainforest would likely have greater biodiversity than a full acre of desert.

Explanation:

biodiversity of an ecosystem can be simply explain as the variability that exist in the ecosystem. These are difference that exist between living organism in terms of their habitat, their species and so on. However there exist different relationship between the area of ecosystem and the biodiversity of an ecosystem such that An ecosystem with large area of a forest will likely have higher biodiversity than a smaller area of the same forest.

Another one is that A half acre of rainforest would likely have greater biodiversity than a full acre of desert.

3 0
2 years ago
Read 2 more answers
PLEASE HELP DUE IN MINS. Thanks
rjkz [21]

Answer:

"C" I think....

Explanation:

I am really sorry if I am wrong, but if right, I hope this helps!

4 0
3 years ago
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How was helium first discovered?
lora16 [44]
I think it’s the third one idk tho
3 0
3 years ago
Read 2 more answers
What causes breakers?
nata0808 [166]

Answer:

nreaker

Explanation:

A switch that automatically interrupts or shuts off an electric current at the first indication of a overload

3 0
3 years ago
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