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3 years ago

A car moves with an average speed of 45 miles/hour. How long does the car take to travel 90 miles?

Physics

2 answers:

Sloan [31]2 years ago

7 0

Answer:

Explanation:

If you are going 45 miles per hour, you will travel 45 miles in 1 hour. It will take you 2 hours to travel 90 miles at a speed of 45 miles per hour.

to make it easier multiply 45 by 2 = 90

45 x 2 = 90

Elis [28]3 years ago

5 0

Answer:

Explanation:

45+45=90

45 per hour

so, 2 hours

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Answer:

Explanation:

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2. no they are put to balance the equation

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3 years ago

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Answer:
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3 years ago

In a classical carnival ride, patrons stand against the wall in a cylindrically shaped room. Once the room gets spinning fast en

g100num [7]

Answer:

- the speed of a person "stuck" to the wall is 14.8 m/s

- the normal force of the wall on a rider of m=54kg is 1851 N

- the minimum coefficient of friction needed between the wall and the person is 0.29

Explanation:

Given information:

the radius of the cylindrical room, R = 6.4 m

the room spin with frequency, ω = 22.1 rev/minutes = 22.1 $\frac{2\pi }{60}$ = 2.31 rad/s

mass of rider, m = 54 kg

the speed of a person "stuck" to the wall

v = ω R

= 2.31 x 6.4

= 14.8 m/s

the normal force of the wall on a rider

F = m a

a = ω^2 R

= $\frac{v^{2} }{R^{2} }$ R

= $\frac{v^{2} }{R}$

F = $\frac{mv^{2} }{R}$

= $\frac{(54)(14.8)^{2} }{6.4}$

= 1851 N

the minimum coefficient of friction needed between the wall and the person

F(friction) = μ N

W = μ N

m g = μ $\frac{mv^{2} }{R}$

g = μ $\frac{v^{2} }{R}$

μ = $\frac{gR}{v^{2} }$

= $\frac{(9.8) (6.4)}{14.8^{2} }$

= 0.29

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