4 years ago

Define aperture of a spherical mirror

1 answer:

4 0

The diameter of the reflecting surface of spherical mirror is called its aperture. Mirrors whose aperture is much smaller than its radius of curvature, we use R=2f.

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What displacement do I have if I travel at 10 m/s E for 10 s? A. 1 m E B. 1 m C. 100 m D. 100 m E Scalar quantities include what

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3 years ago

A playground merry-go-round of radius R = 1.20 m has a moment of inertia I = 240 kg · m2 and is rotating at 9.0 rev/min about a

Vesnalui [34]

Answer:

ω' = 0.815 rad/s

Explanation:

Given,

R = 1.20 m

Inertia of merry-go- round= 240 kg.m²

Rotating speed = 9 rpm = $9\times \dfrac{2\pi}{60}$

=0.9424 rad/s

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angular speed of the merry-go-round=?

we know

Angular momentum, L = I ω

Moment of inertia of the child

I' = m r² = 26 x 1.2² = 37.44 kgm²

Conservation of angular momentum

initial angular momentum = Final angular momentum

I ω = (I+I')ω'

240 x 0.9424 = (240+37.44) ω'

226.176= 277.44 ω'

ω' = 0.815 rad/s

new angular speed of the merry-go- round is equal to 0.815 rad/s

3 0

4 years ago

1.imagine you were able to throw a ball in a frictionless environment such as outer space.once you let go of the ball,what will

Scorpion4ik [409]

Imagine you were able to throw a ball in a frictionless environment
such as outer space. Once you let go of the ball, it will travel forever
in a straight line, and at a constant speed. (At least until it bumps into
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4 years ago

What is the lift (in newtons) due to Bernoulli's principle on a wing of area 96 m2m2 if the air passes over the top and bottom s

egoroff_w [7]

Answer:

$F_{lift}=2.42*10^{9} N$

Explanation:

Apply Bernoulli's principle

$p_{b}+1/2pv_{b}^{2} =p_{t}+1/2pv_{t}^{2} \\p_{b}-p_{t}= 1/2pv_{t}^{2}-1/2pv_{b}^{2}\\p_{b}-p_{t}= 1/2(1.00*10^{3} kgm^{-3} )(270m/s^{2} )-1/2(1.00*10^{3}kgm^{-3} )(150m/s^{2} )\\p_{b}-p_{t}=2.52*10^{7}N/m^{2}\\ F_{lift}=2.52*10^{7}N/m^{2}*96m^{2} \\ F_{lift}=2.42*10^{9} N$

5 0

4 years ago

Define aperture of a spherical mirror​

Define aperture of a spherical mirror