Physics, 24.03.2020 02:52, mauri66

A 30-g bullet is fired with a horizontal velocity of 450 m/s and becomes embedded in block B, which has a mass of 3 kg. After the impact, block B slides on 30-kg carrier C until it impacts the end of the carrier. Knowing the impact between B and C is perfectly plastic and the coefficient of kinetic friction between B and C is 0.2, determine (a) the velocity of the bullet and B after the first impact, (b) the final velocity of the carrier.

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Using the principle of momentum conservation, the velocity after first impact and final velocity are 4.46 m/s and 0.409 m/s respectively.

Using the principle of conservation of linear momentum, where the initial momentum is equal to the final momentum after impact :

$m_{a}v_{a} = (m_{a} + m_{b})v_{b}$

$(0.03 \times 450) = (0.03 + 3)v_{b}$

$v_{b} = \frac{13.5}{3.03} = 4.46 m/s$

B.)

Final velocity of Carrier :

$(m_{a}m_{b})v_{b}) = (m_{a} + m_{b} + m_{c})v_{c}$

$(0.03 + 3)4.56 = (3 + 0.3 + 30)v_{c}$

$(3.03)4.46 = (33.3)v_{c}$

$13.5138 = (33.3)v_{c}$

$v_{c} = \frac{13.5138}{33.03} = 0.409 m/s$

Hence, the final velocity of the carrier is 0.409 m/s

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answered: desiiraee6265

(a) The velocity of the bullet and B after the first impact is 4.4554 m/s.

(b) The velocity of the carrier is 0.40872 m/s.

Explanation:

(a) To solve the question, we apply the principle of conservation of linear momentum as follows.

we note that the distance between B and C is 0.5 m

Then we have

Sum of initial momentum = Sum of final momentum

0.03 kg × 450 m/s = (0.03 kg + 3 kg) × v₂

Therefore v₂ = (13.5 kg·m/s)÷(3.03 kg) = 4.4554 m/s

The velocity of the bullet and B after the first impact = 4.4554 m/s

(b) The velocity of the carrier is given as follows

Therefore from the conservation of linear momentum we also have

(m₁ + m₂)×v₂ = (m₁ + m₂ + m₃)×v₃

Where:

m₃ = Mass of the carrier = 30 kg

Therefore

(3.03 kg)×(4.4554 m/s) = (3.03 kg+30 kg) × v₃

v₃ = (13.5 kg·m/s)÷ (33.03 kg) = 0.40872 m/s

The velocity of the carrier = 0.40872 m/s.

answered: Guest

the answer would be dignified - apex

answered: Guest

answer;

d. are made mostly of liquid

explanation;

-the general composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

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A 30-g bullet is fired with a horizontal velocity of 450 m/s and becomes embedded in block B, which...