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LuckyWell [14K]
3 years ago
5

An object of mass 0.5 kg is swung in uniform circular motion. The radius is 2 meters, and the force exerted is 4 N. Calculate th

e magnitude of the velocity.
Physics
1 answer:
Katarina [22]3 years ago
8 0
Using
F= mv²/r
4 = 0.5×v² / 2
8 /0.5 = v²
v²=16
v= √16
v= 4 ms-¹
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PLEASE HELP: An engineer is designing a runway. She knows that a plane, starting at rest, needs to reach a speed of 140mph at ta
Oliga [24]

Using kinematics we can find that the take-off distance is 6163 ft

Given parameters

  • The initial and final speed of the plane i = 0 and v = 140 mph
  • Time t = 60.0 s

To find

  • The distance to take off

The measurement system allows not to have problems when working in different units, in this case we reduce the speed units

       v = 140 mile / h (5280 ft / mile) (1h / 3600 s) = 205.34 ft / s

The kinematics allows to find the relationships between the position, the speed and the acceleration of a body, in this case the movement is in one dimension.

          v = v₀ + a t

where v and v₀ are the final and initial velocity, respectively, at acceleration and t the time

          a = \frac{v-v_o}{t}

          a = \frac{205.34 - 0}{60.0}

          a = 3.42 ft / s²

Let's use the expression

          v² = v₀² + 2 a x

Where v and v₀ are the final and initial velocity, respectively, at acceleration and x the distance traveled

              x = \frac{v^2 - v_o^2 }{2 \ a}

              x = \frac{205.33^2 - 0}{2 \ 3.42}

              x = 6163.8 ft

Let's reduce to miles

             x = 6163.8 ft (1 mile / 5280 ft)

             x = 1.17 mile

In conclusion using kinematics we can find that the take-off distance is 6163 ft

Learn more about kinematics here:

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2 years ago
what kinds of investigations might have led to our current understanding of matter and energy? why is it important for scientist
lana66690 [7]

The kind of investigations might have led to our current understanding of matter and energy is research and measurement.

It is important for scientists to use the same scientific method and consistent measurement units in order to get the correct value while analayzing.

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The matter has volume and space occupied.

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Thus, the kind of investigations might have led to our current understanding of matter and energy is research and measurement.

It is important for scientists to use the same scientific method and consistent measurement units in order to get the correct value while analayzing.

Learn more about matter.

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Eddi Din [679]
The best and most correct answer among the choices provided by your question is the first choice or letter A.

<span>Ionization Energy decreases from left to right.</span>

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