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Cloud [144]
3 years ago
11

Two objects of equal mass collide on a horizontal frictionless surface. Before the collision, object A is at rest while object B

has a constant velocity of 12 m/s. After the collision, the two objects are stuck together. What is the speed of the composite body (A B) after the collision
Physics
1 answer:
fenix001 [56]3 years ago
7 0

Answer: 6m/s

Explanation:

Using the law of conservation of momentum, the change in momentum of the bodies before collision is equal to the change in momentum after collision.

After collision, the two objects will move at the same velocity (v).

Let mA and mB be the mass of the two objects

uA and uB be their velocities before collision.

v be their velocity after collision

Since the two objects has the same mass, mA= mB= m

Also since object A is at rest, its velocity = 0m/s

Velocity of object B = 12m/s

Mathematically,

mAuA + mBuB = (mA+mB )v

m(0) + m(12) = (m+m)v

0+12m = (2m)v

12m = 2mv

12 = 2v

v = 6m/s

Therefore the speed of the composite body (A B) after the collision is 6m/s

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Explanation:

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The frequency of the second harmonic of a certain musical instrument is 100 Hz. What is the fundamental frequency of the instrum
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3 years ago
An electric furnace is to melt 40 kg of aluminium/hour. The initial temperature of aluminium is 32°C. Given that aluminium has s
gizmo_the_mogwai [7]

Answer:

Part a)

P = 13.93 kW

Part b)

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Explanation:

Part A)

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here we have

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Since this is the amount of aluminium per hour

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P = \frac{Q}{t}

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Since the efficiency is 85% so actual power required will be

P = \frac{11.84}{0.85} = 13.93 kW

Part B)

Total energy consumed by the furnace for 30 hours

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now the total cost of energy consumption is given as

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3 years ago
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Answer:

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