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uranmaximum [27]
3 years ago
10

2. An athlete of average size is hanging from the end of a 20 m long rope, which has a mass of 4 kg and is attached to a hook in

the ceiling of a gym. If the athlete makes a sudden movement at the end of the rope, estimate how long it will take the disturbance to reach the hook.
Physics
1 answer:
a_sh-v [17]3 years ago
7 0

Answer:

  t = 0.319 s

Explanation:

With the sudden movement of the athlete a pulse is formed that takes time to move along the rope, the speed of the rope is given by

             v = √T/λ

Linear density is

           λ = m / L

           λ = 4/20

           λ = 0.2 kg / m

The tension in the rope is equal to the athlete's weight, suppose it has a mass of m = 80 kg

           T = W = mg

           T = 80 9.8

           T = 784 N

The pulse rate is

          v = √(784 / 0.2)

          v = 62.6 m / s

The time it takes to reach the hook can be searched with kinematics

          v = x / t

          t = x / v

          t = 20 / 62.6

          t = 0.319 s

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3 0
3 years ago
An advanced computer sends information to its various parts via infrared light pulses traveling through silicon fibers (n = 3.50
sasho [114]

Answer:

d = 6.43 cm

Explanation:

Given:

- Speed resistance coefficient in silicon n = 3.50

- Memory takes processing time t_p = 0.50 ns

- Information is to be obtained within T = 2.0 ns

Find:

- What is the maximum distance the memory unit can be from the central processing unit?

Solution:

- The amount of time taken for information pulse to travel to memory unit:

                            t_m = T - t_p

                            t_m = 2.0 - 0.5 = 1.5 ns

- We will use a basic relationship for distance traveled with respect to speed of light and time:

                           d = V*t_m

- Where speed of light in silicon medium is given by:

                           V = c / n

- Hence,              d = c*t_m / n

-Evaluate:           d = 3*10^8*1.5*10^-9 / 3.50

                           d = 0.129 m 12.9 cm

- The above is the distance for pulse going to and fro the memory and central unit. So the distance between the two is actually d / 2 = 6.43 cm

8 0
3 years ago
If you tie a rope to a tree and move it up and down, you are creating what kind of wave?
loris [4]
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4 0
3 years ago
a projectile is launched from level ground with an initial speed v0 at an angle θ with the horizontal. if air resistance is negl
LekaFEV [45]

The time of flight of the launched particle will be 2v₀ sinθ / g.

<h3>What is kinematics?</h3>

The study of motion without considering the mass and the cause of the motion.

A projectile is launched from level ground with an initial speed v₀ at an angle θ with the horizontal. If air resistance is negligible.

Then the time of flight of the launched particle will be given as,

Determine how long it requires the projectile to reach its highest point in order to calculate the flight duration. Just twice as long as the maximum altitude is the travel time.

\rm v_y = v_{o_y} + a_y t

At maximum height, \rm v_y = 0.

The time to reach maximum height is given as

\rm t_{1/2} = - \dfrac{v_{o_y} }{ a_y}

The time of flight is given as,

\rm t = 2 \times t_{1/2} = - \dfrac{2v_{o_y}}{ a_y}

Substituting in \rm v_{o_y} = v_o \ \sin(\theta ) \ and \ a_y = -g, then we have

The time of flight of the launched particle will be 2v₀ sinθ / g.

More about the kinematics link is given below.

brainly.com/question/7590442

#SPJ4

6 0
1 year ago
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