3 years ago

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Physics

1 answer:

alexandr1967 [171]3 years ago

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Answer:

1 is B 2 is D 3 is C

Explanation:

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(a) A uniform disk of mass 21 kg, thickness 0.5 m, and radius 0.6 m is located at the origin, oriented with its axis along the a

Julli [10]

Answer:L=33.93

R.E.=152.30

Explanation:

Given

mass of disk $\left ( m\right )$ =21kg

thickness $\left ( t\right )$ =0.5m

radius $\left ( r\right )$ =0.6m

t=0.7 sec for every complete rotation

therefore angular velocity $\left ( \omega \right ) =\frac{\Delta \theta }{\Delta t}$

$\left ( \omega \right )=\frac{ 2\pi }{0.7}=8.977$ rad/s

Rotational angular momentum is given by

$L=I\omega$

$I$ = $\frac{mr^2}{2}$

I=3.78 $kg-m^2$

$L=3.78\times 8.977$

L=33.93 $\hat{j}$

considering disk is rotating in z-x plane

Rotational kinetic energy= $\frac{I\omega ^{2}}{2}$ =152.30 J

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forsale [732]

(22°C × 9/5) + 32 = 71.6°F

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What is the difference between mechanical digestion and chemical digestion in the mouth

Phoenix [80]

Mechanical digestion is chewing, and chemical digestion is the saliva in your mouth breaking down food.

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If a skier travels at a constant velocity downhill, this means the forces on her are: ................. A. Zero B. Negligible C.

Vlad1618 [11]

Answer:

F = 0

Explanation:

The net force acting on an object is given by the product of mass and acceleration. We know that acceleration is equal to the rate of change of velocity.

Net force,

F = ma

$F=\dfrac{m(v-u)}{t}$

The skier is traveling at a constant velocity, it means there is no change in velocity i.e. acceleration is equal to 0. Hence, the force on her is 0.

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Explanation:

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