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inessss [21]
3 years ago
14

What is the unit of pressure? Why is it called a derived unit?Why has SI system​

Physics
1 answer:
Dovator [93]3 years ago
6 0

Answer:

pascal

Explanation:

its obtained after either division or multiplication

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When air resistance equals the weight of an object, the object has reached
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Answer:

When air resistance equals the weight of an object, the object has reached free fall.

Explanation:

  • When an object has only force acting on it as gravity then, it experiences free fall.
  • During free fall all the forces except gravity is balanced by one another.
  • In the question, object's weight is balanced by air resistance so it is in the state of free fall.
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If a racecar traveling at 6 m/s accelerates at 0.75 m/s over 30 seconds, what is its
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3 years ago
a cyclist coasting down a 5.0 ◦ incline at a constant speed of 6.0 km/h because of air resistance. If the total mass of the bicy
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Answer:

F_{net}= 85.41\ N

Explanation:

mass of the bicycle + cyclist = 50 kg

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a cyclist coasting down a 5.0° incline

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the air drag must be equal to gravitational force downward along the ramp

F_a = mg sin \theta  

now for upward motion

F_{net} = mg sin \theta + air\ drag

F_{net} = mg sin \theta + mg sin \theta

F_{net} = 2 mg sin \theta

F_{net} = 2\times 50 \times 9.8 sin 5^0

F_{net}= 85.41\ N

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