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Kay [80]
3 years ago
14

With an angular velocity of 1.7π rad/s, how much time is required to complete 18 complete revolutions?

Physics
1 answer:
sineoko [7]3 years ago
5 0

The angle for each complete revolution is 2π radians (that's 360°).

So . . .

Time = (18 revs) x (2π radians / rev) x (1 sec / 1.7π radians)

Time = (18 · 2π · 1 / 1.7π) (rev ·radian · sec / rev · radian)

<em>Time = 21.18 seconds</em>

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3 years ago
A bowling ball travels at 2.0 m/s. It has 16 J of kinetic energy. what Is the mass of the bowling ball in kilograms ?
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4 years ago
A parallel-plate capacitor initially has a potential difference of 400 V and is then disconnected from the charging battery. If
Damm [24]

The capacitance of a capacitor is the ratio of the stored charge to its potential difference, i.e.

C = Q/ΔV

C is the capacitance

Q is the stored charge

ΔV is the potential difference

Rearrange the equation:

ΔV = Q/C

We also know the capacitance of a parallel-plate capacitor is given by:

C = κε₀A/d

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κ is the capacitor's dielectric constant

ε₀ is the electric constant

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d is the plate separation

If we substitute C:

ΔV = Qd/(κε₀A)

We assume the stored charge and the area of the plates don't change. Then if we double the plate spacing, i.e. we double the value of d, then the potential difference ΔV is also doubled.

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