3 years ago

I need help solving both of the questions fast please!!!!!!

Physics

1 answer:

sergey [27]3 years ago

6 0

I haven´t learned that yet I´m sorry.

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1 point

Kazeer [188]

P = m v
250 = m5

250 = 5m

m = 50 Kg

Option C

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3 years ago

A person driving a car applies the brakes. This produces friction, which stops the car. Into which type of energy is the mechani

Makovka662 [10]

D) Heat, because friction produces heat, not light, gravitational or chemical. hope this helps! : )

7 0

4 years ago

Read 2 more answers

A 0.5 kg turntable with a radius of 15 cm is rotating 78 times per minute.

alexandr1967 [171]

Answer:

Explanation:

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3 years ago

Three children are riding on the edge of a merry‑go‑round that has a mass of 105 kg105 kg and a radius of 1.80 m1.80 m . The mer

rewona [7]

Answer:

New angular speed changes from 16 rpm to 19.95 rpm

Explanation:

In the given system the angular momentum of the system is conserved

initial angular momentum of the system

$L_{i}=I_{1}\omega _{1}\\\\\omega _{1}=\frac{8\pi }{15}rad/sec\\\\I_{1}=\frac{1}{2}mr^{2}+(m_{1}+m_{2}+m_{3})r^{2}\\\\I_{1}=\frac{1}{2}\times 105\times 1.8^{2}+(33+28+28) \times 1.8^{2}=458.46kgm^{2}\\\\\therefore L_{i}=458.46\times \frac{8\pi }{15}=768.16$

When 28 kg child moves to the center the moment of inertia changes thus we have

$I_{2}=\frac{1}{2}mr^{2}+(m_{1}+m_{2})r^{2}\\\\I_{1}=\frac{1}{2}\times 105\times 1.8^{2}+(33+28) \times 1.8^{2}=367.74kgm^{2}\\\\\therefore L_{f}=367.74\times \omega _{f}$

Equating initial and final angular momentum we get

$I_{2}=\frac{1}{2}mr^{2}+(m_{1}+m_{2})r^{2}\\\\I_{1}=\frac{1}{2}\times 105\times 1.8^{2}+(33+28) \times 1.8^{2}=367.74kgm^{2}\\\\\therefore L_{f}=367.74\times \omega _{f}\\\\\omega _{f}=\frac{768.16}{367.74}=2.1rad/sec\\\\N_{2}=19.95rpm$

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3 years ago

Moving along the elevtromagnetic spectrum from low frequency to high frequency, what , if anything, happens to the wavelength?

jenyasd209 [6]

Explanation:

the wavelengths get shorter

3 0

3 years ago