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3 years ago

When the posted speed limit is 70 mph, the minimum speed limit is ___________ mph.

Physics

2 answers:

Alisiya [41]3 years ago

7 0

Answer:

50 mph

Explanation:

The maximum speed limit is the speed that one drives without over-speeding, that is, breaking the law. The maximum speed limit varies from area to area.

In the streets, the minimum speed, and at times the maximum speed is 40 mph. This is because the areas are residential areas which have people and pets moving.

In highways, the minimum speed can be 50 mph. This is because it is generally safe to drive at those speeds without the risk of a pedestrian-related accident.

Therefore, minimum speed of 50 mph are permissible in highways.

boyakko [2]3 years ago

6 0

Because driving to slow that you block other vehicles is illegal when the posted speed limit is 70 mph, the minimum speed limit is 50 mph

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The weight of a hydraulic barber's chair with a client is 2100 N. When the barber steps on the input piston with a force of 44 N

guajiro [1.7K]

Answer:

$\frac{r_1}{r_2}=6.9$

Explanation:

According to Pascal's Law, the pressure transmitted from input pedal to the output plunger must be same:

$P_1 = P_2\\\\\frac{F_1}{A_1}=\frac{F_2}{A_2}\\\\\frac{F_1}{F_2}=\frac{A_1}{A_2}\\\\\frac{F_1}{F_2}=\frac{\pi r_1^2}{\pi r_2^2}\\\\\frac{F_1}{F_2}=\frac{r_1^2}{r_2^2}$

where,

F₁ = Load lifted by output plunger = 2100 N

F₂ = Force applied on input piston = 44 N

r₁ = radius of output plunger

r₂ = radius of input piston

Therefore,

$\frac{r_1^2}{r_2^2}=\frac{2100\ N}{44\ N}\\\\\frac{r_1}{r_2}=\sqrt{\frac{2100\ N}{44\ N}} \\\\\frac{r_1}{r_2}=6.9$

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<em>I hope this explanation had helped you today!</em>

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