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Alex17521 [72]
3 years ago
7

A 300-kg truck moving rightward with a speed of 5 km/hr collides head on with a 1000kg car moving leftward with a speed of 100 k

m/hr. The two vehicles stick together and move with the same velocity after the collision determine the post - collision speed of the car and truck
Physics
1 answer:
igor_vitrenko [27]3 years ago
7 0

Answer:

The final velocity of the vehicles will be -75km per hour (leftwards).

Explanation:

Let us call m_1, v_1 mass and velocity of the truck , m_2, v_2 mass and velocity of the car, and v_f the final velocity of the vehicles.

The law of conservation of momentum states that

m_1v_1-m_2v_2= v_f(m_1+m_2)

solving for v_f we get:

v_f = \dfrac{m_1v_1-m_2v_2}{m_1+m_2}

putting in numerical values

m_1 =300 kg \\v_1 =5km/hr = 1.39m/s\\m_2 = 1000kg\\v_2 = 100km/hr = 27.78m/s

v_f = \dfrac{300*(1.39)-1000*(27.78)}{300+1000}

\boxed{v_f = -21.0m/s } (<em>the negative sign indicates that the vehicles are moving in the leftward direction)</em>

or -75.8 km per hour.<em> </em>

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Answer:

T = 692.42 N

Explanation:

Given that,

Mass of hammer, m = 8.71 kg

Length of the chain to which an athlete whirls the hammer, r = 1.5 m

The angular sped of the hammer, \omega=1.16\ rev/s=7.28\ rad/s

We need to find the tension in the chain. The tension acting in the chain is balanced by the required centripetal force. It is given by the formula as follows :

F=m\omega^2r\\\\=8.71\times (7.28)^2\times 1.5\\\\=692.42\ N

So, the tension in the chain is 692.42 N.

5 0
3 years ago
A graph of angular position v. time has the following equation:
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Answer:

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5 0
3 years ago
A charged balloon will stick to a neutral wall. which process is involved?
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 As the balloon is charged (It gained electrons), and the charge of the same sign repel each other, when it approaches the wall, the electrons of this wall will move away, and the positive charges (protons) will remain in the nearest area to the balloon. As the charges of different signs are attracted, the balloon will be stuck to the wall.
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Why are potassium molecules likely to enter a red blood cell?
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A. Group of cross country runners decided to go on an hour and a half run. During the first hour, they ran a total of 13 kilomet
pshichka [43]

Answer:

The average speed for the entire run is 12 km/h.

Explanation:      

The average speed is given by the following equation:

\overline{v} = \frac{d_{T}}{t_{T}}

Where:

d_{T}: is the total distance

t_{T}: is the total time

If during the first hour, they ran a total of 13 kilometers and then, they ran 5.0 kilometers during the next half an hour we have:

d_{T} = 13 km + 5 km = 18 km

t_{T} = 1 h + \frac{1}{2} h = 1.5 h

Hence, the average speed is:

\overline{v} = \frac{d_{T}}{t_{T}} = \frac{18 km}{1.5 h} = 12 km/h

Therefore, the average speed for the entire run is 12 km/h.

I hope it helps you!                                                                                      

3 0
3 years ago
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