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2 years ago

11

What do you need to know to describe the velocity of an object ?

1 answer:

Lelechka [254]2 years ago

3 0

<span>1. Rate of change of postion
2. Need to know the direction of the displacement or change of position

When you know these 2 things, you can describe an objects velocity
</span>

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marysya [2.9K]

Answer:

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What are some ways houses along the coastlines can protect themselves from storm surges?

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2 years ago

Compare the magnitude of the magnetic field at the center of a circular current loop of radius 30 mm with the magnitude of the m

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Answer:

Ratio of magnetic field will be $\frac{B}{B'}=0.0055$

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$B=\frac{\mu _0i}{2r}$ ---------eqn 1

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3 years ago

A bucket of water of mass 10 kg is pulled at constant velocity up to a platform 30 meters above the ground. This takes 10 minute

Rudik [331]

Answer:

W = 2352 J

Explanation:

Given that:

mass of the bucket, M = 10 kg

velocity of pulling the bucket, v = 3 $m.min^{-1}$

height of the platform, h = 30 m

time taken, t = 10 min

rate of loss of water-mass, m = $0.4 kg.min^{-1}$

Here, according to the given situation the bucket moves at the rate,

$v=3 m.min^{-1}$

The mass varies with the time as,

$M=(10-0.4t) kg$

Consider the time interval between t and t + ∆t. During this time the bucket moves a distance

∆x = 3∆t meters

So, during this interval change in work done,

∆W = m.g∆x

<u>For work calculation:</u>

$W=\int_{0}^{10} [(10-0.4t).g\times 3] dt$

$W= 3\times 9.8\times [10t-\frac{0.4t^{2}}{2}]^{10}_{0}$

$W= 2352 J$

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3 years ago