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3 years ago

What is the resistance force when you walk up an inclined plane?

Physics

1 answer:

erastovalidia [21]3 years ago

8 0

Answer:

the resistance force is mg cos(-)

Explanation:

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Assume that a 15-kg ball moving at 8 m/s strikes a wall perpendicularly and rebounds elastically at the same speed. What is the

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3 years ago

If John travels 2,387 miles in 2 days, what's his average speed per hour?

klasskru [66]

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3 years ago

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3 years ago

A fairground ride consists of a large vertical drum that spins so

expeople1 [14]

Answer:

v = 3.84 m/s

Explanation:

In order for the riders to stay pinned against the inside of the drum the frictional force on them must be equal to the centripetal force:

$Centripetal\ Force = Frictional\ Force\\\\\frac{mv^2}{r} = \mu R = \mu W\\\\\frac{mv^2}{r} = \mu mg\\\\\frac{v^2}{r} = \mu g\\\\v = \sqrt{\mu gr}$

where,

v = minimum speed = ?

g = acceleration due to gravity = 9.81 m/s²

r = radius = 10 m

μ = coefficient of friction = 0.15

Therefore,

$v=\sqrt{(0.15)(9.81\ m/s^2)(10\ m)}$

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3 years ago

You are designing an elevator for a hospital. The force exerted on a passenger by the floor of the elevator is not to exceed 1.7

HACTEHA [7]

Answer:

5.62 m/s

Explanation:

Newton's law of motion can be used to determine the maximum speed of the elevator. In the question, we are given:

Force exerted by the elevator (R) = 1.7 times the weight of the passenger (m*g)

Thus: R = 1.7*m*g

Distance (s) = 2.3 m

Newton's second law of motion: R - m*g = m*a

1.7*m*g - m*g = m*a

a = 0.7*m*g/m = 0.7*g = 0.7*9.8 = 6.86 m/s²

To determine the maximum speed:

$v^{2} _{f} = v^{2} _{i} + 2as$ $= 0 + 2(6.86)(2.3) = 31.556$

$v_{f} = \sqrt{31.556} = 5.62 m/s$

Therefore, the elevator maximum speed is equivalent to 5.62 m/s.

8 0

3 years ago