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MrRissso [65]
3 years ago
13

When a pendulum is swinging, the velocity is highest at which point?

Physics
1 answer:
Tems11 [23]3 years ago
3 0
At the center, when the bob is hanging straight down

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A weightlifter uses a force of 356 N to lift a set of weights 2.2 m off the ground. How much work did the weightlifter do? Answe
Valentin [98]

Answer:

783.2 N.m or Joules

Explanation:

W=F*d*cos(Ф)

Work done when a force F is applied to move an object by a displacement d meters

where cos(Ф) is the angle between applied force F and displacement d

Since the weightlifter is applying the force upward and the set of weight also move upward therefore, both are in same direction hence angle will be zero.

Now lets substitute the given values into the work equation:

W=356*2.2*cos(0)

since cos(0)=1

W=356*2.2*1

W=783.2 N.m

or

W=783.2 Joules

Since the unit of Force is Newton (N) and the unit of displacement is meters (m) therefore, unit of work done will be N.m

Note: 1 N.m is equivalent to 1 joule

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3 years ago
How does the tide cycle affect erosion along a sea coast?
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Difference between hair dryer and heat gun
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How do you use the SI conversion tool to perfom metric conversions?
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A cooling fan is turned off when it is running at 850 rev/min. It turns 1500 revolutions before it comes to a stop. (a) What was
8_murik_8 [283]

Answer

given,

cooling fan revolution = 850 rev/min

fan turns before revolution = 1500 revolutions

\omega = 850 \dfrac{2\pi}{60}

\omega = 89\ rad/s

θ = 1500 revolution

θ = 1500 x 2 x π

θ = 9424.78 rad

a) using equation of rotation

ω² = ω₀² + 2 α θ

ω = 0 because body comes to rest

0 = 89² + 2 x α x 9424.78

α = -0.42 rad/s²

b) time take for the fan to stop

ω = ω₀ + α t

0 = 89 - 0.42 t

t = \dfrac{89}{0.42}

t = 211.9 s

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