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Darya [45]
3 years ago
6

The small particles that produce a streak of light upon entering earth’s atmosphere are called

Physics
2 answers:
iris [78.8K]3 years ago
8 0
They are called meteors... i just took the test
Afina-wow [57]3 years ago
3 0

Explanation:

When a meteoroid enters the earth's atmosphere at high speed, a streak of light called meteor is observed. This light effect is produced by the ionization of air molecules in the upper atmosphere (at altitudes from 76 to 100 km). Most of these are the size of a grain of sand.

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A uniform cylindrical grindstone has a mass of 10 kg and a radius of 12 cm. (a) What is the rotational kinetic energy of the gri
Drupady [299]

Answer:

a) KE = 888.26J

b) N = 294.5 turns

Explanation:

For the kinetic energy:

KE = I/2*\omega_o^2

The inertia is:

I=m/2*R^2=0.072kg.m^2

So, the kinetic energy will be:

KE = 888.26J

Now, friction force is:

Ff = μ*N = 0.80*5N = 4N

The energy balance would be:

Kf - Ko = Wf    where Kf=0;   Ko = 888.26J;  and Wf is the work done by friction force.

Wf = -Ff*d = -Ff*N*2*π*R   where N is the amount of turns it gives.

Replacing these values into the energy balance:

0-888.26=-4*N*2*π*0.12

-888.26=-0.96*π*N

N=294.5 turns

6 0
3 years ago
A 241 kg mass is lifted 1.8 m. What is the potential energy of the mass (in J)?
Korolek [52]

Answer:

mass is lifted 1.8 m. What is the potential energy of the mass 4. A 100 kg

6 0
2 years ago
Read 2 more answers
A mass m is attached to a string connected to a force sensor on a rotating platform. The platform’s angular velocity, ω, can be
makkiz [27]

Answer:

The mass m is 0.332 kg or 332 gm

Explanation:

Given

The platform is rotating with angular speed , \omega =8.5\, \frac{rad}{sec}

Mass m is moving on platform in a circle with radius , r=0.20\, m

Force sensor reading to which spring is attached , F=4.8\, N

Now for the mass m to move in circle the required centripetal force is given by F=m\omega ^{2}r

=>4.8=m\times 8.5 ^{2}\times 0.20

=>m=0.332\, kg

Thus the mass m is 0.332 kg or 332 gm

7 0
3 years ago
Could I get some help with this
nika2105 [10]

please give me brainlest!!

the answer is A.

4 0
3 years ago
Hi, please just say the Letter (A,B,C,D,E)
bija089 [108]
The letter that answers this question correctly is E .
4 0
3 years ago
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