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Elza [17]
2 years ago
13

Which term defines the energy of motion?

Physics
1 answer:
damaskus [11]2 years ago
3 0
Its (a) and(a)for the other ? and the last one is (d)
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Consider a rifle, which has a mass of 2.44 kg and a bullet which has a mass of 150 grams and is loaded in the firing chamber.Whe
svetlana [45]

Answer:

a. 0 kgm/s

b. 0 kgm/s

c. 66 kgm/s

d. -66 kgm/s

e. 0 kgm/s

f. -27.05 m/s

g. 173.68 N

h. 12.58 m/s

i. 0.772 m

j. 14487 J

Explanation:

150 g = 0.15 kg

a. Before the bullet is fired, both rifle and the bullet has no motion. Therefore, their velocity are 0, and so are their momentum.

b. The combination is also 0 here since the bullet and the rifle have no velocity before firing.

c. After the bullet is fired, the momentum is:

0.15*440 = 66 kgm/s

d. As there's no external force, momentum should be conserved. That means the total momentum of both the bullet and the rifle is 0 after firing. That means the momentum of the rifle is equal and opposite of the bullet, which is -66kgm/s

e. 0 according to law of momentum conservation.

f. Velocity of the rifle is its momentum divided by mass

v = -66 / 2.44 = -27.05 m/s

g. The average force would be the momentum divided by the time

f = -66 / 0.38 = 173.68 N

h. According the momentum conservation the bullet-block system would have the same momentum as before, which is 66kgm/s. As the total mass of the bullet-block is 5.1 + 0.15 = 5.25. The velocity of the combination right after the impact is

66 / 5.25 = 12.58 m/s

i. The normal force and also friction force due to sliding is

F_f = N\mu = Mg\mu = 5.25*9.81*0.83 = 42.75N

According to law of energy conservation, the initial kinetic energy will soon be transformed to work done by this friction force along a distance d:

W = K_e

dF_f = 0.5Mv_0^2

d = \frac{Mv_0^2}{2F_f} = \frac{5.25*12.58^2}{2*42.75} = 0.772 m

j.Kinetic energy of the bullet before the impact:

K_b = 0.5*m_bv_b^2 = 0.5*0.15*440^2 = 14520 J

Kinetic energy of the block-bullet system after the impact:

K_e = 0.5Mv_0^2 = 0.5 * 5.25*12.58^2 = 33 J

So 14520 - 33 = 14487 J was lost during the lodging process.

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3 years ago
If someone has a special rank in brainly how do you feel
Aliun [14]

Answer:

Explanation:tbh I wouldn’t care

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2 years ago
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When saturated air is cooled what happens to its dew point
Eddi Din [679]


When saturated air is cooled, it simply reaches its dew point. Dew point is simply the temperature at which dew begins to form.

Dew point of saturated air is already pre-determined by how much water vapor the air contains. A  state of saturation exists when the air is holding the maximum amount of water vapor possible at the existing temperature and pressure. The higher the dew point, the higher the moisture content of the air. Cooling does not change the dew point of saturated air, rather its the level of saturation. 

So if the air has more moisture, dew will form at a higher temperature and vice versa, but dew point is NEVER EVER GREATER than the air temperature.

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PLEASE HELP WITH THIS QUESTION WILL GIVE BRAINLIST TO BEST ANSWER
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The net force is 12 N to the left.
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A baseball with a mass of 0.15 kg is moving at a speed of 40 m/s. What is
Afina-wow [57]

Answer:

120 J

Explanation:

KE = mv²/2 = (0.15 kg * [40 m/s]²)/2 = 120 J

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