Which of the following is a valuable part of the scientific method?

Answers

Answer 1

Answer: trial and error

scientific laws and theories are proven by experimental data and large bodies of evidence.

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A thin conducting plate 50.0 cm on a side lies in the xy plane. If a total charge of 4.00 ? 10 ?8 C is placed on the plate, find (a) the charge density on the plate, (b) the electric field just above the plate, and (c) the electric field just below the plate.

Answers

Answer:

a) 8*10^-8C/m²

b) +9.04*10^3N/C

c) = -9.04*10^3N/C

Explanation:

Given

Side length, L = 50cm = 0.5m

Charge on the plate, Q = 4*10^-8C

Surface charge density, σ = Q/A

The surface charge density of each part is then half of the total charge density of the plate. Thus,

σ(face) = 1/2σ

σ(face) = Q/2A

σ(face) = Q/2L²

Now we plug in, since we have Q and L

σ(face) = 4*10^-8 / 2*0.5²

σ(face) = 4*10^-8 / 0.5

σ(face) = 8*10^-8C/m²

Magnitude of electric field above the plate is,

E = σ(face) / E•

E = 8*10^-8 / 8.85*10^-12

E = 9.04*10^3 N/C

If we assume this plate lies on the side of the "xy" plane, the electric field is directed in the positive "z" direction. As such,

E = +9.04*10^3N/C

Electric field below the plate has the same magnitude, but different direction. So, E = -9.04*10^3N/C

How does a parallel circuit differ from a series circuit? A. A parallel circuit has one path for electrons, but a series circuit has more than one path. B. A series circuit has one path for electrons, but a parallel circuit has more than one path. C. A parallel circuit includes more than one resistor, but a series circuit has one resistor. D. A parallel circuit has a power source,

Answers

A series circuit has only one path for current,
while a parallel circuit has more than one.

Answer:

A series circuit

Explanation:

From what is known about spring tides and neap tides, you can conclude that:_________. a. the sun’s gravity exerts the most power when the moon is on the opposite side of the Earth from the sun.
b. the height of high tides varies with the phases of the moon.
c. spring tides and neap tides affect the phases of the moon.
d. the moon revolves around the Earth every 14 days.
Please select the best answer from the choices provided

Answers

Answer:

Explanation:

Because neap and spring tides happen twice a month during new moon and full moon .It occurs twice in a month which is 14 days

Answer:

i think it is d

Explanation:

The AC voltage source is connected to an inductor and a resistor in series. If the frequency of the source is increased the current in the circuit will _________.

Answers

Answer:

If the frequency of the source is increased the current in the circuit will decrease.

Explanation:

The current through the circuit is given as;

$I = (V)/(Z)$

Where;

V is the voltage in the AC circuit

Z is the impedance

$Z = √(R^2 + X_L^2)$

Where;

R is the resistance

$X_L$ is the inductive reactance

$X_L$ = ωL = 2πfL

where;

L is the inductance

f is the frequency of the source

Finally, the current in the circuit is given as;

$I = (V)/(√(R^2 + (2\pi fL)^2) )$

From the equation above, an increase in frequency (f) will cause a decrease in current (I).

Therefore, If the frequency of the source is increased the current in the circuit will decrease.

Hypothesis and Data CollectionIn this experiment, you will evaluate the color and texture of salt, chalk, and talc and test their reactions in water and vinegar. Before you start the experiment, write down your predictions.

Part A
Which mineral will dissolve easily in water?