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Pie
3 years ago
15

In tae-kwon-do, a hand is slammed down onto a target at a speed of 10 m/s and comes to a stop during the 7.0 ms collision. Assum

e that during the impact the hand is independent of the arm and has a mass of 0.90 kg. What are the magnitudes of the (a) impulse and (b) average force on the hand from the target
Physics
1 answer:
wlad13 [49]3 years ago
5 0

Answer:

(A) Impulse = 9Ns

(B) F = 1286N

Explanation:

Impulse = change in momentum = m(v-u)

v = 0 (the hand comes to a stop)

u = -10m/s

Mass = 0.9kg

Impulse = 0.9 ×(0- (-10))

= 9Ns

(B) F×t = Impulse

F = Impulse/ t

t = 7ms = 7×10-³

F = 9/ (7×10-³)

F = 1286N.

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awareness.

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4 years ago
A bicycle rider has a speed of 20.0 m/s at a height of 60 m above sea level when he begins coasting down hill. Sea level is the
IRINA_888 [86]

Answer:

The rider's speed will be approximately 35 m/s

Explanation:

Initially the rider has kinetic and potential energy, and after going down the hill, some of the potencial energy turns into kinetic energy. So using the conservation of energy, we have that:

kinetic_1 + potencial_1 = kinetic_2 + potencial_2

The kinetic and potencial energy are given by:

kinetic = mass * speed^2 / 2

potencial = mass * gravity * height

So we have that:

m*v^2/2 + mgh = m*v'^2/2 + mgh'

20^2/2 + 9.81*60 = v'^2/2 + 9.81*18

v'^2/2 + 176.58 = 788.6

v'^2/2 = 612.02

v'^2 = 1224.04

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8 0
3 years ago
What is the mass of an object with a density of 13.5 g/cm3 and a volume of 5cm3?
STatiana [176]
Density d=m/V

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hope this helps you
7 0
3 years ago
Whitch family has full valence energy level
levacccp [35]
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3 years ago
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Jobisdone [24]

Answer: The correct answer is option b.

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Putting values in above equation, we get:

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3 0
3 years ago
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