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4 years ago

Why every time I use this website it sometimes be wrong ?

1 answer:

3 0

The answers given in Brainly are written by fellow students and some teachers. The answers may or may not be wrong as they are written by people like you, however, there are several verified answers that are correct and can be 100% trusted.

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A thin uniform cylindrical turntable of radius 2.2 m and mass 35 kg rotates in a horizontal plane with an initial angular speed

fenix001 [56]

Explanation:

The given data is as follows.

M = 35 kg, radius (r) = 2.2 m,

m = 17 kg, = 11 rad/s

We assume that will be the final angular speed.

Now, according to the conservation of angular momentum.

$L_{1} = L_{2}$

or, $I_{1} \times \omega_{1} = I_{2} \times \omega_{2}$

Putting the given values into the above formula as follows.

$I_{1} \times \omega_{1} = I_{2} \times \omega_{2}$

or,

= $\frac{(0.5 \times 35 \times (2.2)^{2}) \times 11}{(0.5 \times 35 \times (2.2)^{2} + 17 \times (1.5)^{2})}$

= 7.58 rad/s

Thus, we can conclude that the angular speed of the clay and turntable is 7.58 rad/s.

4 0

4 years ago

Read 2 more answers

Jjbjbbk;jbjb;bkjb;kjj

Maksim231197 [3]

Answer:

Uhh??!?!?!?!?

Explanation:

8 0

3 years ago

Why there is tides in sea and ocean

AleksandrR [38]

Answer:

<em> Tides are the rise and fall of sea levels. Tides occur due to the gravitational forces exerted on the Earth by moon, and to a lesser extent, the sun. That's why tides occur in ocean or sea.</em>

Hope this helps

7 0

4 years ago

20.Two balls are in motion. A 2-kg ball moving at 4m/s and a 4-kg ball moving at 2m/s, which one has greater kinetic energy? a.

bekas [8.4K]

Answer:

Explanation:

Given that two balls are in motion. A 2-kg ball moving at 4m/s and a 4-kg ball moving at 2m/s, which one has greater kinetic energy? a. 2 kg ball moving at 4 m/s c. Both balls have the same KE b. 4 kg ball moving at 2 m/s d. Cannot be determined

The formula for kinetic energy is :

K.E = 1/2mv^2

A 2-kg ball moving at 4m/s will have kinetic energy of 1/2 × 2 × 4^2

K.E = 16J

and a 4-kg ball moving at 2m/s will have kinetic energy of 1/2 × 4 × 2^2

K.E = 2 × 4

K.E = 8J

which one has greater kinetic energy? Definitely it is a 2 kg ball moving at 4 m/s. Since 16J is greater than 8J. The correct answer is A.

8 0

3 years ago

A 300 kg box rests on a platform attached to a forklift shown. Starting from rest at time t = 0 seconds, the box is lowered with

Tasya [4]

Answer:

N = 2490 N

Explanation:

Determine the upward force exerted by the horizontal platform on the box as it is lowered.

It is given that,

Mass of a box, m = 300 kg

Starting from rest at time t = 0 seconds, the box is lowered with a downward acceleration of 1.5 m/s².

It is assumed to find the upward force exerted by the horizontal platform on the box. It is given by :

mg-N=ma

$N=m(g-a)\\\\N=300\left(9.8-1.5\right)\\\\N=2490\ N$

So, the normal force is 2490 N.

8 0

3 years ago