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777dan777 [17]
3 years ago
14

A bicyclist of mass 88.0 kg puts all his weight on each downward-moving pedal as he pedals up a steep road. Take the diameter of

the circle in which the pedals rotate to be 0.33 m, and determine the magnitude of the maximum torque he exerts in the process.
Physics
1 answer:
Eduardwww [97]3 years ago
3 0

Answer:

142.296 Nm.

Explanation:

Torque: This is the force that tend to cause a body to rotate or twist. The S.I unit of torque is Nm.

From the question,

T = F×r.................... Equation 1

Where T = Torque, F = Force, r = radius of the circle.

Note: F is the weight of the bicyclist.

Then,

F = W = mg............... Equation 2

Substitute equation 2 into equation 1

T = mgr................... Equation 3

Given: m = 88 kg, g = 9.8 m/s², r = 0.33/2 m

T = 88(9.8)(0.33)/2

T = 142.296 Nm.

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Answer:bight

Explanation:

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3 years ago
Elizabeth, with a mass of 56.1kg stands on a scale in an elevator. Total mass of elevator plus Elizabeth=850kg. As the elevator
Reil [10]

Answer:

acceleration = 1.79 m/s^2

Tension = 6817 N

Explanation:

First let's find Elizabeth's weight:

P = m*g = 56.1 * 9.81 =  550.34\ N

Her weight is greater than the normal force (N = 450 N), so the elevator is going downwards.

The acceleration of Elizabeth is given by:

P - N = m*a

Where P is the weight of Elisabeth, N is her normal force, m is her mass and a is the acceleration. Then, we have that:

56.1*9.81 - 450 = 56.1*a

a = 100.34 / 56.1 = 1.79\ m/s^2

The tension in the cable is given by:

P - T = m*a

In this case, we use the total mass, so we have:

850*9.81 - T = 850*1.79

T = 850 * 8.02 = 6817\ N

7 0
3 years ago
PLEASE HELP ITS URGENT
sergey [27]
I think B because it’s the only one where everything is father now then in 10,000 bc
8 0
3 years ago
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An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is dimmer than the second sta
kvv77 [185]

Answer: It is smaller than the second star

Explanation: The brightness of a star depends on two factors: The distance from the Earth and size of the star. More the distance from the Earth, the star appears dimmer. And bigger the star, brighter it is.

b =\frac{L}{4\pi d^2}

Where L is the luminosity,d is the distance

Luminosity depends on the surface area of star (4\pi R^2)

Here, it is given that the two stars are at the same distance from the Earth. The first star is dimmer.  We can conclude from this that first star star must be smaller than the second star.

7 0
3 years ago
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How do you do question 2?
Inessa [10]

Answer:

Look at explanation

Explanation:

a) Weight is another term for how much gravity is on an object and can be calculated by using the local gravity*mass so in order to find weight divide 1200 by g

m= 1200/9.8= 122.45kg

b) We know Fnet=ma and Fnet=Fapp+Fresistivity so Fapp+Fresistivity=ma

Plug in values

500+Fresistivity=122.45*2

solve for Fresistivty= 244.9-500=-255.1N (the reason it is negative is because it is in the opposite direction

c)Power= ΔE/Δt and we also know ΔE=ΔWork so Power= ΔWork/Δt. If a person pulls harder, they have a greater force and since mass is constant, acceleration is greater and since the amount of time needed to cover A to B is reduced since x-x0=v0t+1/2at²(v0=0, when you solve for t it will be lower because acceleration increases). If t decreases than Power increases by inverse proportionality. Work =Fd if the amount of Force increases by distance travelled remains constant than work also increases so power will also increase.

7 0
3 years ago
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