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3 years ago

Which statement is a characteristic of a concave lens?

Physics

2 answers:

diamong [38]3 years ago

6 0

I think the answer would be D

Trava [24]3 years ago

3 0

D. it is thickest in the middle

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Write 5 advantages and disadvantges of force. <br><br>aka. physics<br><br>aka. pull and push

USPshnik [31]

It is becomes difficult to walk on a slippery road due to low friction. ... We can not fix nail in the wood or wall if there is no friction. ... A horse can not pull a cart unless friction furnishes him a secure Foothold. We can write on a paper or on a board.

6 0

3 years ago

A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the

Dimas [21]

Answer:

98N and 147N

Explanation:

We have the following information:

$m=50kg\\\mu_s =0.4\\\mu_k = 0.2\\F=140N$

We can find the static fricton force as follow,

$F=\mu_s * N$

Where N is the normal force (mg)

$F=0.3*50*9.8\\F=147N$

Static friction force at 147N is greater than the force applied hence body does not move.

$F=\mu_k N = 0.2*50*9.8= 98N$

3 0

4 years ago

If an R = 1-kΩ resistor, a C = 1-μF capacitor, and an L = 0.2-H inductor are connected in series with a V = 150 sin (377t) volts

fgiga [73]

Answer

given,

R = 1-kΩ = 1000 Ω

C = 1-μF

L = 0.2-H

V = V_max sin( ω t)

comparing

V = 150 sin ( 377 t)

ω = 377

$\chi_c = \dfrac{1}{\omega C}$

$\chi_c = \dfrac{1}{377 \times 1 \times 10^{-6}}$

$\chi_c = 2652.5\Omega$

$\chi_L =377 \times 0.2$

$\chi_L =75.4\ \Omega$

Impedance,

$Z = \sqrt{R^2+(\chi_L-\chi_c)^2}$

$Z = \sqrt{1000^2+(75.4 -2652.5)^2}$

Z = 2764.3 Ω

now,

V_{max} = 150 V

$I_{max} = \dfrac{V}{Z}$

$I_{max} = \dfrac{150}{2764.3}$

$I_{max} = 0.0543$

$I_{max} = 54.3\ mA$

3 0

3 years ago

Use the drop-down menus to answer each question. How do objects with the same charge interact? How do objects with opposite char

ValentinkaMS [17]

It's very tough to use the drop-down menus for this. I'll just do the best I can without them.

-- Objects with the same charge repel each other with electrostatic force, and attract each other with gravity. You can ignore the gravity because the electrostatic force is so much stronger.

-- Objects with opposite charge attract each other with electrostatic force, and also attract each other with gravity. You can ignore the gravity because the electrostatic force is so much stronger.

-- Objects with no charge have no electrostatic force between them, and they only attract each other with gravity.

5 0

4 years ago

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Do I divided or multiply

Papessa [141]

Weight is mass x gravity, so you'd multiply the mass of the astronaut by the gravitational pull.

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4 years ago

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