3 years ago

A car of mass 800 kg is moving at a uniform velocity of 72 km/hr. Find its

Physics

1 answer:

77julia77 [94]3 years ago

6 0

Answer:

hope its helpful to uh...

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satela [25.4K]

Well, the "magnitude of g" in a place is always described as the
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4 years ago

A mass of 15 kg of air in a piston-cylinder device is heated from 25 o C to 77 o C by passing current through a resistance heate

Sophie [7]

Answer:

The electrical energy supplied is 0.233 kWh

Explanation:

Given :

Mass of air $m = 15$ kg

Initial temperature $T _{1} =$ 298 K

Final temperature $T_{2} =$ 350 K

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From the first law of thermodynamics,

$\Delta U = W_{in} - W_{out} - Q_{out}$

We know that internal energy is proportional to difference of temperature,

$W_{in} = m (T_{2} - T_{1} ) + 60$

$W_{in} = 15 \times (350-298) + 60 }$

Now we need answer into kWh so ( 1 kWh = 3600 kJ ).

So we need to multiply ( $\frac{1}{3600}$ )

$W_{in} = [15 \times (350-298) + 60 ] \times \frac{1}{3600}$ kWh

$W_{in} = 0.233$ kWh

Therefore, the electrical energy supplied 0.233 kWh

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3 years ago

Over the past few decades earth scientists have developed the theory of plate tectonics

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Propose an experiment that could be used to demonstrate that friction is a contact force?

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Leona [35]

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