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Hunter-Best [27]
2 years ago
11

Emmett is lifting a box vertically. Which forces are necessary for calculating the total force?

Physics
1 answer:
kicyunya [14]2 years ago
4 0

Hello there i hope you are having a good day :) Question : Emmett is lifting a box vertically. Which forces are necessary for calculating the total force?

So Firstly when lifting a box you would need to be vertically and you would need to added to calculate the total forces that its gravitational force, tension force and also  air resistance force.

Hopefully this helps you.

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A roller coaster cart of mass m = 223 kg starts stationary at point A, where h1 = 26.8 m and a while later is at B, were h2 = 14
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Answer:

vB = 15.4 m/s

Explanation:

Principle of conservation of energy:

Because there is no friction the mechanical energy is conserve

ΔE = 0

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K : Kinetic energy (J)

U: Potential energy (J)

K = (1/2)mv²

U = m*g*h

Where :

m: mass (kg)

v : speed (m/s)

h : hight (m)

Ef - Ei = 0

(K+U)final - (K+U)initial =0

(K+U)final = (K+U)initial

((1/2)mv²+m*g*h)final = ((1/2)mv²+m*g*h)initial , We divided by m both sides of the equation:

((1/2)vB² + g*hB = (1/2 )vA²+ g*hA

(1/2) (vB)² + (9.8)*(14.7) =  0 + (9.8)(26.8 )

(1/2) (vB)² = (9.8)(26.8 ) - (9.8)*(14.7)

(vB)² = (2)(9.8)(26.8 - 14.7)

(vB)² = 237.16

v_{B} = \sqrt{237.16}

vB = 15.4 m/s : speed of the cart at B

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Answer:

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