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marin [14]
2 years ago
6

The light bulb in your room is not very bright. You want to use a concave mirror to direct its illumination into a tight, parall

el beam of light for reading. The radius of curvature of the mirror is 30 centimeters. At what distance from the mirror should you place the light bulb to produce this parallel light beam?
Physics
1 answer:
rewona [7]2 years ago
3 0
Radius of curvature<span> of a spherical mirror = 2 × </span>Focal length<span> 
and the ray of light is parallel to the principle axis if the incident </span><span>Passes through focus

therefore, focal length =30/2=<span>15cm

</span></span><span>The mirror should be placed at a distance of 15cm from the light bulb to produce this parallel light beam.</span>
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A certain alarm clock ticks four times each second, with each tick representing half a period. The balance wheel consists of a t
Semenov [28]

Answer:

a. I=2.77x10^{-8} kg*m^2

b. K=4.37 x10^{-6} N*m

Explanation:

The inertia can be find using

a.

I = m*r^2

m = 0.95 g * \frac{1 kg}{1000g}=9.5x10^{-4} kg

r=0.54 cm * \frac{1m}{100cm} =5.4x10^{-3}m

I = 9.5x10^{-4}kg*(5.4x10^{-3}m)^2

I=2.77x10^{-8} kg*m^2

now to find the torsion constant can use knowing the period of the balance

b.

T=0.5 s

T=2\pi *\sqrt{\frac{I}{K}}

Solve to K'

K = \frac{4\pi^2* I}{T^2}=\frac{4\pi^2*2.7702 kg*m^2}{(0.5s)^2}

K=4.37 x10^{-6} N*m

3 0
2 years ago
If you wished to warm 100 kg of water by 15 degrees celsius for your bath, how much heat would be required? (give your answer in
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For the answer to the question above, 
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<span>m = mass (kg) </span>
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<span>Q = 100kg * (4.187 kJ/kgK) * 15 K </span>
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6 0
2 years ago
A shuttle on Earth has a mass of 4.5 E 5 kg. Compare its weight on Earth to its weight while in orbit at a height of 6.3 E 5 met
faltersainse [42]

Answer:

83%

Explanation:

On the surface, the weight is:

W = GMm / R²

where G is the gravitational constant, M is the mass of the Earth, m is the mass of the shuttle, and R is the radius of the Earth.

In orbit, the weight is:

w = GMm / (R+h)²

where h is the height of the shuttle above the surface of the Earth.

The ratio is:

w/W = R² / (R+h)²

w/W = (R / (R+h))²

Given that R = 6.4×10⁶ m and h = 6.3×10⁵ m:

w/W = (6.4×10⁶ / 7.03×10⁶)²

w/W = 0.83

The shuttle in orbit retains 83% of its weight on Earth.

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Any ferrous metal object within or near the mri magnet has the potential of becoming a projectile. this is commonly referred to
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What two processes practiced by scientists increase the likelihood of a successful outcome in science?
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Answer:

ULTIMATE CORRECT ANSWER

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Explanation:

5 0
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