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3 years ago

PLEASE HELP ME!!!!! I'LL MARK YOU BRAINLIEST IF YOU ANSWER THIS CORRECTLY

Physics

2 answers:

mrs_skeptik [129]3 years ago

4 0

Answer: A

Explanation: Kinetic energy is when something is in motion so it would just make sense

Pachacha [2.7K]3 years ago

3 0

Answer: a

Explanation:

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What is the kinetic energy of a 1200 kg roller coaster that is moving with a speed of 24.0 m/s. ?

Vanyuwa [196]

Answer: 345600 J

Explanation: solution attached

KE= 1/2 mv²

3 0

3 years ago

A disk of mass m and moment of inertia of I is spinning freely at 6.00 rad/s when a second identical disk, initially not spinnin

Nadusha1986 [10]

Answer:

The angular speed of the new system is $3\,\frac{rad}{s}$ .

Explanation:

Due to the absence of external forces between both disks, the Principle of Angular Momentum Conservation is observed. Since axes of rotation of each disk coincide with each other, the principle can be simplified into its scalar form. The magnitude of the Angular Momentum is equal to the product of the moment of inertial and angular speed. When both disks begin to rotate, moment of inertia is doubled and angular speed halved. That is:

$I\cdot \omega_{o} = 2\cdot I \cdot \omega_{f}$

Where:

$I$ - Moment of inertia of a disk, measured in kilogram-square meter.

$\omega_{o}$ - Initial angular speed, measured in radians per second.

$\omega_{f}$ - Final angular speed, measured in radians per second.

This relationship is simplified and final angular speed can be determined in terms of initial angular speed:

$\omega_{f} = \frac{1}{2}\cdot \omega_{o}$

Given that $\omega_{o} = 6\,\frac{rad}{s}$ , the angular speed of the new system is:

$\omega_{f} = \frac{1}{2}\cdot \left(6\,\frac{rad}{s} \right)$

$\omega_{f} = 3\,\frac{rad}{s}$

The angular speed of the new system is $3\,\frac{rad}{s}$ .

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3 years ago

The transmission coefficient of the hypothetical disease dumas fever is 0.2. if the combined death and recovery rate is 0.4, wha

borishaifa [10]

NT = r / β
where NT is the threshold density, r is the recovery and death rate and β is the transmission coefficient.

= 0.4 / 0.2
= 2

7 0

3 years ago

Hello all you people who need points use me to get points your welcome :)

frozen [14]

Answer:

Thank you so much!!!!

Explanation:

I really need this points

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3 years ago

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Give an example of a force applied to an object that does not change the object's velocity. Why does the object's velocity not c

Xelga [282]

Answer:

A chair at rest on the floor has two forces acting on it its own weight that pulls it downward and the floor pushing upward on the chair, both of these forces are acting on it but the net force is 0, so the chair remains at rest and its velocity stays at 0.

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2 years ago