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marissa [1.9K]
3 years ago
13

A car with mass 450 kg has a kinetic energy of 16,256 j. What is the speed of the car?

Physics
2 answers:
Lana71 [14]3 years ago
7 0

Answer:

Speed of the car is 8.49 m/s

Explanation:

It is given that,

Mass of the car, m = 450 kg

Kinetic energy of the car, E = 16256 J

We need to find the speed of the car. The kinetic energy of the car is given by :

E=\dfrac{1}{2}mv^2

v=\sqrt{\dfrac{2E}{m}}

v=\sqrt{\dfrac{2\times 16256\ J}{450\ kg}}

v = 8.49 m/s

So, the speed of the car is 8.49 m/s. Hence, this is the required solution.

Likurg_2 [28]3 years ago
5 0
E = 1/2 * m * v²

v = √(2 * E  / m)
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the sole of a tennis shoe has a surface area of 0.0290 m^2. if it is worn by a 65.0 kg person, what pressure does the shoe exert
AURORKA [14]

Answer: 21965.517 Pa

Explanation:

Pressure P is the force F exerted by a gas, a liquid or a solid on a surface (or area) A, its unit is Pascal Pa which is equal to N/m^{2} and its formula is:  

P=\frac{F}{A} (1)

In this case we have the surface of a sole of a tennis shoe:

A=0.0290 m^{2} (2)

And the mass m of the person who wears it:

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On the other hand, we know the weight is the force  F the Earth exerts on people and objects due gravity g :

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P=21965.517 Pa This is the pressure the shoe exert on the ground

5 0
3 years ago
Determine the acceleration of a pendulum bob as it passes through an angle of 15 degrees to the right of the equilibrium point.
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Answer:

Explanation:

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2

mu  

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​

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Gonz drove 90km in 60mins,so they would drive 45km in 30 mins dividing it by 2.
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For the adverage speed, we should first add the speed of each family in mph , so 90+60, which equals 150 and divide that by 2 because there are 2 speeds so the average speed is 75mph.

P.S English is my second language so tell me if you don't understand something and I will try and explain.
5 0
3 years ago
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