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FromTheMoon [43]
3 years ago
7

A vehicle is moving at a velocity, v, given by v =12t - 3t2 ms-1. Use

Engineering
1 answer:
Tanya [424]3 years ago
8 0

Answer: a = 12 - 6t, a = -6 m/s ^2

Explanation:

Acceleration is rate of change in velocity.

Acceleration = change in velocity ÷ change in time.

a = dv ÷ dt

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Answer:

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3 years ago
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A smooth sphere with a diameter of 6 inches and a density of 493 lbm/ft^3 falls at terminal speed through sea water (S.G.=1.0027
Pachacha [2.7K]

Given:

diameter of sphere, d = 6 inches

radius of sphere, r = \frac{d}{2} = 3 inches

density,  \rho} = 493 lbm/ ft^{3}

S.G = 1.0027

g = 9.8 m/ m^{2} = 386.22 inch/ s^{2}

Solution:

Using the formula for terminal velocity,

v_{T} = \sqrt{\frac{2V\rho  g}{A \rho C_{d}}}              (1)

(Since, m = V\times \rho)

where,

V = volume of sphere

C_{d} = drag coefficient

Now,

Surface area of sphere, A = 4\pi r^{2}

Volume of sphere, V = \frac{4}{3} \pi r^{3}

Using the above formulae in eqn (1):

v_{T} = \sqrt{\frac{2\times \frac{4}{3} \pir^{3}\rho  g}{4\pi r^{2} \rho C_{d}}}

v_{T} = \sqrt{\frac{2gr}{3C_{d}}}  

v_{T} = \sqrt{\frac{2\times 386.22\times 3}{3C_{d}}}

Therefore, terminal velcity is given by:

v_{T} = \frac{27.79}{\sqrt{C_d}} inch/sec

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1 year ago
Rests represent periods of __________ in a measure.
DaniilM [7]

Answer:

Rests represent periods of <em><u>silence</u></em> in a measure.

Explanation:

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