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3 years ago

If a person and wheelchair have a combined weight of 185 lb, how much ideal effort

Physics

1 answer:

Sholpan [36]3 years ago

8 0

Answer:

Effort force $=824.04 \sin\theta$

where $\theta$ is the angle of inclination of the ramp.

Explanation:

The given combined mass of a person and wheelchair is 185 lb.

In SI unit, 1 pound= 0.453592 kg

So, 185 lb= $185\times0.453592$ kg=84kg (approximately)

Assuming the whole mass as a point mass and denote it by M, so

M=84kg

Let the angle of inclination of the ram with the is $\theta$ with respect to the ground and assume that the friction offered by ram id negligible, so neglection the frictional force.

The applied effort force, F, will be minimum when applied in the direction parallel to the ramp surface as shown in the figure.

The gravitational force action on M is Mg in the downward direction.

For the mass M to be at an equilibrium condition on the ramp, the sum of the total force in any direction will be zero.

Equate the sum of all the forces in the direction parallel to the ramp to zero.

$F-Mg\sin\theta=0$

$\Rightarrow F=Mg \sin\theta$

$\Rightarrow F=84\times 9.81\sin\theta$

$\Rightarrow F=824.04\sin\theta N$ .

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3 years ago

Q 1 . How many significant figures are in the following measurement? 0.0009(1 point)

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Here we have some questions about experimental errors.

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Then we have only one significant figure, the 9.

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Then:

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The worst measure is 45lb, so the smallest significant figure that we should use is the first one at the left of the decimal point, then we need to round the other two measures to the next whole number, we will get:

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Notice that our measure has one significant figure after the decimal point, so we need to round the error to the same significant figure.

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The percent uncertainty will be the quotient between the error and the measure times 100%, or:

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