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Xelga [282]
3 years ago
9

A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car?

Physics
1 answer:
VLD [36.1K]3 years ago
8 0
Speed = \frac{Distance}{Time} 150 km = 150 000 m Speed = \frac{150000}{7200} Speed = 20.83 m/s, or 75.0 km/h
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a crane does 9,500 J of work to lift a crate straight up using a force of 125 N. how high does the crane lift the crate?
Lina20 [59]

Answer:

<em>The crane lifts the crate up to 76 m high</em>

Explanation:

<u>Work Done by a Force</u>

The work done by a force of magnitude F that displaces an object by a distance y is given by

W=F.y

We know a crane does a work of 9,500 Joule to lift a crate and is using a force of 125 Nw.

The above equation can be solved to know the value of y in terms of the work and the force:

\displaystyle y=\frac{W}{F}

Plugging in the given values

\displaystyle y=\frac{9,500}{125}

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3 years ago
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This external energy should be greater than the latent heat of solid in order to successfully break the bonds to form liquid. So the change in the enthalpy of the reaction while conversion from solids to liquids are termed as latent heats of fusion.

Even the inter-conversion from liquid to solid state will undergo change in enthalpy where the heat will be released and that is termed as latent heats of solidification. It is found that latent heat of solidification is equal in magnitude but opposite in direction with the latent heats of fusion.

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