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Romashka [77]
2 years ago
6

. En 1/2 hora, un ciclista recorrió 20 kilómetros. ¿Cuál fue el promedio de velocidad del ciclista? a. 10 km / h b. 60 km c. 40

km d. 40 km / h
Por ayúdenme respóndanme rápido
Physics
1 answer:
ohaa [14]2 years ago
8 0
Distancia el lingo por la tarde

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Answer:

maximum possible velocity = \sqrt{ugR}

Explanation:

centripetal acceleration when the  car is going in the circle must be less than the maximum friction for the car to not slip.

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where v is the velocity of car and r is the radius of circle

maximum friction = umg

where u is the coefficient of static friction.

thereforeumg\geq \frac{mv^{2}}{R}

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Two objects of the same mass, but made of different materials, are initially at the same temperature. Equal amounts of heat are
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Answer:

The final temperature of the two objects is the same.

Explanation:

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Q=mc(T_{f} -T_{i})

Here, Q is the heat energy, m is the mass of the object, c is the specific heat and T_{f},T_{i} are the final temperature and initial temperature.

According to the given question, Two objects of the same mass, but made of different materials, are initially at the same temperature. Equal amounts of heat are added to each object.

Q=mc(T_{f}-T_{i})                                             ............(1)

Q=mc(T'_{f}-T_{i})                                            .............(2)

From (1) and (2),

mc(T_{f}-T_{i})=mc(T'_{f}-T_{i})

T_{f}-T_{i}=T'_{f}-T_{i}

T_{f}=T'_{f}

Therefore, the final temperature of the two objects is the same.

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Explanation: Please see the attachments below

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