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3 years ago

Please help me with part b.

Physics

1 answer:

Lerok [7]3 years ago

8 0

I'm sorry but I don't see anything that says part B
.

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In a police ballistics test, 2.00-g bullet traveling at 700 m/s suddenly hits and becomes embedded in a stationary 5.00-kg wood

aksik [14]

Answer:

Here we use the conservation of momentum theorem.

m stands for mass, and v stands for velocity. The numbers refer to the respective objects.

m1v1 + m2v2 = m1vf1 + m2vf2

Since the equation is perfectly inelastic, the final velocity of both masses is the same. Let’s account for this in our formula.

m1v1 + m2v2 = vf(m1 + m2)

<u>Let’s substitute in our givens.</u>

(0.002 kg)(700 m/s) + (5 kg)(0 m/s) = vf(0.002 kg + 5 kg)

I assume you are proficient in algebra I, so I will not include the steps to simplify this equation.

Note that I have considered the bullet’s velocity to be in the positive direction,

The answer is vf = 0.280 m/s

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3 years ago

Two astronauts, each having a mass of 74 kg, are connected by a 8.53 m rope of negligible mass. They are isolated in space, orbi

AveGali [126]

Answer:

a) 2575 kgm²/s

b) 1.23 kJ

c) 0.478 rad/s

Explanation:

Given

Mass of astronauts, m = 74 kg

Length of rope, l = 8.53 m

Speed of orbit, v = 4.08 m/s

L = m1v1.x1(i) + m2v2.x2(i) = 2mv(d/2)

Thus, L = 2.m.v.(d/2)

L = 2 * 74 * 4.08 * (8.53/2)

L = 2 * 74 * 4.08 * 4.265

L = 2575.38 kgm²/s

Rotational Energy of the system

K(i) = 1/2m1v1(i)² + 1/2m2v2(i)²

K(i) = 2(1/2) * 74 * 4.08²

K(i) = 74 * 16.6464

K(i) = 1231.83 J = 1.23 kJ

Angular momentum is conserved, thus, angular velocity, w = v/r

w = 4.08 / 8.53

w = 0.478 rad/s

7 0

3 years ago

A cylinder that is 15 cm tall is filled with water. If a hole is made in the side of the cylinder, 4.0 cm below the top level. A

olga55 [171]

Answer:

About 13 cm

Explanation:

We are given that

Length of cylinder,l=15 cm= $15\times 10^{-2} m$

1 m=100 cm

h=4 cm= $\frac{4}{100}=0.04 m$

Horizontal velocity of the existing water stream= $v=\sqrt{2gh}$

Where $g=9.8m/s^2$

Using the formula

$v=\sqrt{2\times 9.8\times 0.04}=0.885m/s$

h'=l-h=15-4=11 cm= $\frac{11}{100}=0.11 m$

Initial velocity of water stream,u=0

$t=\sqrt{\frac{2h'}{g}}=\sqrt{\frac{2\times 0.11}{9.8}}=0.15 s$

Distance, d=vt

Using the formula

$d=0.885\times 0.15=0.133 m$

$d=0.133\times 100=13.3 cm\approx 13 cm$

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3 years ago

Newton's First Law of Motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon

atroni [7]

This is sometimes called the Law of Inertia

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Motor 1 and motor 2 each lift objects of equal weight. They both have the same power rating but motor 2 lifts the weight faster.

Oksanka [162]

Answer:

motor 2

Explanation:

because of strenth

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