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Fudgin [204]
3 years ago
6

A bicycle pedal is pushed straight downwards by a foot with a 16 Newton force. The shaft of the pedal is 20 cm long. If the shaf

t is π/5 radians past horizontal, what is the magnitude of the torque about the point where the shaft is attached to the bicycle?
Physics
1 answer:
BartSMP [9]3 years ago
6 0

Answer:

2.56 N*m

Explanation:

Torque is force times distance, with the force being perpendicular to the distance.

If the force and distance are not perpendicular, a projection of one of the two must be used instead.

We will use the projection of the length of the shaft upon a perpendicular of the force applied. This will have a magnitude of:

Lh = L * cos(a) (I name it Lh because it is a horizontal projection in this case)

Lh = 0.2 * cos(π/5) = 0.16 m

Then:

T = f * d

T = 16 * 0.16 = 2.56 N*m

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PtichkaEL [24]

Answer:

t = 5.19 s

Explanation:

We have,

Height of the cliff is 132 m

It is required to find the time taken by the ball to fall to the ground. Let t is the time taken. So, using equation of kinematics as :

y=ut+\dfrac{1}{2}gt^2\\\\\text{since}\ u=0\\\\y=\dfrac{1}{2}gt^2\\\\t=\sqrt{\dfrac{2y}{g}}\\\\t=\sqrt{\dfrac{2\times 132}{9.8}}\\\\t=5.19\ s

So, it will take 5.19 seconds to fall to the ground.

8 0
3 years ago
How do you make a magnet with wire and electricity ?
AVprozaik [17]
<h2>Answer:</h2>

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<h2>Explanation:</h2>

If you wrap a copper wire into coils and run an electrical current through it, you will create a magnetic field. If you rotate a permanent magnet as opposed to an item that has been magnetized inside a coil of copper wire, you can create an electrical current. The strength of magnetic field generated is proportional to the amount of current through the winding.

5 0
3 years ago
What is the equation for weight?
Andrews [41]

Answer:

w=m(9.8 m/s^)

Explanation:

weight is equal to your mass times gravity

4 0
3 years ago
A 1520 kg car is rolling<br> down a frictionless<br> 14.4° slope. What is<br> its acceleration?
Umnica [9.8K]

Answer:

a = 2.44 m/s²

Explanation:

The Net force acting on the car downwards the plane will be equal to the component of the weight that is parallel to the plane.

Thus;

mg(sin θ) = ma

Thus;. g(sin θ) = a

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θ = 14.4°

Thus;

9.81 × sin 14.4 = a

a = 2.44 m/s²

7 0
3 years ago
Psychology
Igoryamba

Answer:

True

Explanation:

8 0
3 years ago
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