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Shalnov [3]
3 years ago
9

g You are standing on a skateboard, initially at rest. A friend throws a very heavy ball towards you. You can either catch the o

bject or deflect the object back towards your friend (such that it moves away from you with the same speed as it was originally thrown). What should you do in order to MINIMIZE your speed on the skateboard?
Physics
1 answer:
kirill115 [55]3 years ago
7 0

Answer:

catch the ball

Explanation:

if you push the ball back, that equal amount of force will applied to you. however if you catch it, you absorb less of the directional energy

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Constants Modern wind turbines are larger than they appear, and despite their apparently lazy motion, the speed of the blades ti
nadezda [96]

It is given that the length of blade of the turbine is 58 m.

During the motion, the turbine will undergo rotational motion. Hence the radius of the circle traced by the turbine is equal to the length of the blade.

Hence radius r = 58 m.

The frequency of the turbine [f] =14 rpm.

Here rpm stands for rotation per minute.

Hence the frequency of the turbine in one second-

                                                      f=\frac{14}{60}\ s^-1

                                                      f=0.23333 Hz

Here Hz[ hertz] is the unit of frequency.

The angular velocity of the turbine \omega =2\pi f

                                                          \omega=2*3.14*0.2333

                                                          \omega=1.465124 radian/second

Now we have to calculate the centripetal  acceleration of the blade.

Let the linear velocity of the blade is v.

we know that  linear velocity v=ωr

The centripetal acceleration is calculated as-

                                                                      a_{c} =\frac{v^2}{r}

                                                                            =\frac{[\omega r]^2}{r}

                                                                            =\omega^2r

                                                                            =[1.465124]^2 *58

                                                                            =124.5021234 m/s^2      [ans]

8 0
3 years ago
A wheel rotates 3 times. What is its angular displacement?
tia_tia [17]

Answer:

The angular displacement would be 6 Pi radians or 1080 degrees.

Explanation:

Every individual rotation is 2 Pi (this applies to anything regardless of radius).

Since there are three rotations you are going to multiply 2 Pi by 3.

This will give you 6 Pi which you can convert to equal 1080 degrees (1 Pi = 180 degrees).

5 0
4 years ago
Read 2 more answers
Force = mass times acceleration
Alona [7]

Yes indeed ! Very good !


3 0
3 years ago
Particles can enter the air by
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Answer:

the answer is diffusion

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Once a supergiant fuses all of its hydrogen into helium, what happens in the core?
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It goes into a supernova I think
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