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enot [183]
3 years ago
8

Which is a diatomic molecule?A.He B.O2 C.NaCl D.CuF2

Physics
1 answer:
ziro4ka [17]3 years ago
7 0
I think the answer would be A
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Kid A has jumped off the sled! (RIP)
balandron [24]

Answer:

46.45 m/s

Explanation:

Total momentum before jump = Total momentum after jump

11.7 * ( 36.7 + 45.2 ) = ( 36.7 * (-31.1) ) + ( 45.2 * v )

v*45.2 - 1141.37 = 958.23

v = 2099.6/45.2 = 46.45

5 0
3 years ago
In grinding a steel knife blade (specific heat = 0.11 cal/g-c),the metal can get as hot as 400C. If the blade has a mass of 80g,
babymother [125]

Answer:

33 g.

Explanation:

Assuming no heat transfer can be possible except for heat exchange between water and steel, we can say that the heat lost by the knife, must be equal to the heat gained by the water.

As we have a limit for the maximum temperature of both elements (once reached a final thermal equilibrium), of 100ºC, which means that the maximum allowable change in temperature will be of 300º C for the knife, and of 80º C for the water.

Empirically , it has been showed that for a heat exchange process using only conduction, the heat needed to raise the temperature of a body, is proportional to the mass, being the proportionality constant a factor that depends on the material, called specific heat.

So, we can write the following equation:

cs*mk*Δtk = cw*mw*Δtw

Replacing by the givens of the question, we have:

0.11 cal/gºC * 80 g * 300ºC = 1 cal/gºC*mw*80ºC

Solving for mw = 2,640 cal / 80 cal/g =33 g.

5 0
3 years ago
What is the frequency of a wave that has a wavelength of 2000 meters and is traveling at 20 m/s?
Artist 52 [7]

Answer:

freqiency=velocity/wavelength

ief=20/2000=0.01hz

7 0
3 years ago
Como un astronauta utiliza la fuerza de hallar y empujar?
PilotLPTM [1.2K]

Answer:

La única manera en que nuestro astronauta sería capaz de empujar la nave espacial en el espacio sin alejarse sería usar algo llamado "unidad de propulsión de astronauta". Supongamos que el astronauta está usando un SPK soviético, el sistema de cohetes mochila más poderoso jamás utilizado en el espacio.

Explanation:

3 0
3 years ago
A 62 kg boy and a 37 kg girl use an elastic rope while engaged in a tug-of-war on a friction-less icy surface. If the accelerati
Paraphin [41]

Answer:

The magnitude of the acceleration of the boy toward the girl is 1.31\ m/s^2

Explanation:

It is given that,

Mass of the boy, m_1=62\ kg

Mass of the girl, m_2=37\ kg

The acceleration of the girl toward the boy is, a_2=2.2\ m/s^2

To find,

The acceleration of the boy toward the girl.

Solution,

Let a_1 is the magnitude of the acceleration of the boy toward the girl. We know that force acting on one object to other are equal in magnitude but opposite in direction. So,

F_1=-F_2

m_1a_1=-m_2a_2

a_1=-\dfrac{m_2a_2}{m_1}

a_1=-\dfrac{37\times 2.2}{62}

a_1=-1.31\ m/s^2

|a_1|=1.31\ m/s^2

So, the magnitude of the acceleration of the boy toward the girl is 1.31\ m/s^2

7 0
3 years ago
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