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3 years ago

Please help it’s do soon

Physics

1 answer:

viktelen [127]3 years ago

8 0

When y’all are all over the place and I wanna is a time to come sit in my

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The muzzle velocity of a 50.0g shell leaving a 3.00 kg rifle is 400m/s what is the recoil velocity of the rifle

serg [7]

Here if we consider bullet and gun as a system then we can say that momentum of the system will remain conserved

so we will have

$m_1v_{1i} + m_2v_{2i} = m_1v_{1f} + m_2v_{2f}$

now we know that

$m_1 = 50 g = 0.050 kg$

$m_2 = 3 kg$

$v_{1i} = v_{2i} = 0$

$v_{1f} = 400 m/s$

now we will have

$0.050(0) + 3(0) = 0.050(400) + 3(v)$

$20 + 3v = 0$

$v = - \frac{20}{3} = - 6.67 m/s$

so gun will recoil with speed 6.67 m/s

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3 years ago

A box moves 5m horizontally when force F=10N is applied at an angle 0=30°.

True [87]

Answer:

43.3J

Explanation:

Given parameters:

Force = 10N

Distance = 5m

Angle = 30°

Unknown:

Work done = ?

Solution:

Work done is the force applied to move a body through a particular distance;

Work done = Force x distance cos Ф

Now insert the parameters and solve;

Work done = 10 x 5 cos 30 = 43.3J

7 0

3 years ago

A 25.0kg girl pushes a 50.0kg boy so that he accelerates at 4.00m/s2. What is the force of the boy on the girl? A. 200N B. 100N

Fynjy0 [20]

Answer:

Explanation:

so the answer is 200N

and I hope it is correct

8 0

3 years ago

What is the name of the process where rocks are being broken down into small grains of sediment or soil?

elena-s [515]

Answer:

a. weathering.

Explanation:

weathering is the process of breaking down rocks and minerals into smaller pieces by water, wind, and ice.

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3 years ago

What is the half-life of an isotope that decays to 25% of its original activity in 70.8 hours?

loris [4]

Are there any options?

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3 years ago