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3 years ago

9

Which parts of a compound microscope magnify objects? a convex and a concave lens two convex lenses two concave lenses one conca

ve and two convex lenses?

2 answers:

Hoochie [10]3 years ago

6 0

I believe the answer is two convex lenses. A compound microscope has two systems of lenses for greater magnification, the ocular, or eyepiece lens that one looks into and the objective lens, or the lens closest to the object. Both the ocular lens and the objective lens are convex lens.

Inessa [10]3 years ago

3 0

Answer:

two concave lenses

Explanation:

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A block of mass m sits at rest on a rough inclined ramp that makes an angle θ with the horizontal. What must be true about force

nignag [31]

Answer:

Option B

Explanation:

For a system of block on inclined ramp shown in the attached image. From the attached image, the Normal force N, weight mg and frictional force f act on the block. The sum of vertical forces should be zero just as sum of vertical forces should be zero when the system is in equilibrium condition.

Taking sum of forces along the inclined plane we deduce that

[tex]f=mgsin \theta [tex]

Therefore, option B is the correct option.

8 0

3 years ago

A heat engine operates between a hot reservoir with a temperature of 400 K and a cold reservoir with a temperature of 300 K. The

natali 33 [55]

Answer:

Explanation:

Given

Temperature of Hot reservoir $T_1=400 K$

Temperature of Cold reservoir $T_2=300 K$

Heat reservoir $Q=500 J$

Work done $W=150 J$

heat Exhaust $Q_{rejection }=350 J$

$Q=W+Q_{rejected}$

$500=150+350$

L.H.S=R.H.S

thus it follows first law

$\eta _{carnot}=1-\frac{T_L}{T_H}$

$\eta _{carnot}=1-\frac{300}{400}$

$\eta _{carnot}=0.25$

Cycle Efficiency

$\eta =\frac{W}{Q}=\frac{150}{500}=0.3$

Carnot efficiency is less than cycle thus it violates second law

3 0

3 years ago

Find your mass if a scale on earth reads 650 N when you stand on it.

netineya [11]

Weight = (mass) x (gravity)

Acceleration of gravity on Earth = 9.8 m/s²

   Weight on Earth = (mass) x (9.8 m/s²)

Divide each side by (9.8 m/s²): Mass = (weight) / (9.8 m/s²)

    Mass = (650 N) / (9.8 m/s²)

   Mass = 66.33 kg (rounded)

7 0

4 years ago

A 40.0-μFcapacitor is connected across a 60.0 Hz generator. An inductor is then connected in parallel with the capacitor. What i

amm1812

Answer:

The value of the inductance is 175.9 mH.

Explanation:

Given that,

Capacitor $C= 40.0\ \muF$

Frequency = 60.0 Hz

The inductor and capacitor is connected in parallel, the voltage across each of these elements is the same.

We have,

$V_{L}=V_{C}$

Using ohm's law

$I_{rms}\times X_{L}=I_{rms}\times X_{C}$

$X_{L}=X_{C}$

$2\pi f L=\dfrac{1}{2\pi f C}$

$L=\dfrac{1}{4\pi^2\times f^2\times C}$

Put the value into the formula

$L=\dfrac{1}{4\times\pi^2\times60.0^2\times40\times10^{-6}}$

$L=0.1759\ H$

$L=175.9\times10^{-3}\ H$

$L=175.9\ mH$

Hence, The value of the inductance is 175.9 mH.

5 0

4 years ago

Increasing the temperature of object by 20K = C *

Whitepunk [10]

Answer:

B

Explanation:

6 0

3 years ago