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Olegator [25]
3 years ago
10

Ignore friction. A 20. Lb. Object was lifted to a height of 10 feet by a force of 30. Lb. (a) How much work (ft.Lb) is done by t

he force? (b) Find the change in potential energy (ft.Lb) of the object
Physics
1 answer:
Anton [14]3 years ago
4 0
A)
W = Fd
W = (30Lb)(10 ft)
W = 300ft.Lb

b)
work-energy theorem: W = ∆E
∆E = 300ft.Lb
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Streak is a reliable identifier of a mineral. true or false
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Answer:

true?

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How long does it take light to travel 850 km in a vacuum? Answer in ms.(Express your answer to two significant figures.)
poizon [28]

Answer:

0.002833 sec

Explanation:

Speed of light in vacuum is 3\times 10^{8}m/sec

Given distance = 850 km = 850×1000=850000 m

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Time T=\frac{distance }{speed}=\frac{850000}{3\times 10^8}=2.833\times 10^{-3}sec

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3 years ago
Part K Find the y-component of the stone's velocity when it is 8.00 m below your hand
Romashka-Z-Leto [24]

The y-component of the stone's velocity when it is 8 m below the hand is 14.86 m / s

v² = u² + 2 a s

s = Displacement

u = Initial velocity

a = Acceleration

u = 8 m / s

s = 8 m

v² = 8² + 2 * 9.8 * 8

v² = 64 + 156.8

v = √ 220.8

v = 14.86 m / s

The equation used to solve the problem is an equation of motion. These equations are designed to locate an object in motion using components such as velocity, displacement, acceleration and time.

Therefore, the y-component of the stone's velocity is 14.86 m / s

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4 0
1 year ago
What's the weight of a 30x30x50 cm body with the density of 1.8/cm cube?
grin007 [14]

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The weight of the body, W = 793.8 m/s²

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The volume of the body, v = 45,000 cm³

The density of the body, ρ = 1.8 g/cm³

The mass of the body is given by the formula,

                                  m = ρ x v

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                                      = 81,000 g

Hence, the mass of the body is m = 81 kg

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3 years ago
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mel-nik [20]

The block with the bullet lodged in the block is now travelling at 2.133 m/s.

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When there is no external force acting on the system, the momentum remains conserved.

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