PHYSICS HIGH SCHOOL

Oil flows upward in the wick of a lantern because of the liquid property called A. density.
B. meniscusity.
C. viscosity.
D. capillarity.

Answers

Answer 1

Answer: The answer is A because the lighter or heavier the liquid is (in this case it depends) it flows up.

Answer 2

Answer:

the correct answer is

D. capillarity

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A 1000-kg barge is being towed by means of two horizontal cables. One cable is pulling with a force of 80.0 N in a direction 30.0° west of north. In what direction should the second cable pull so that the barge will accelerate northward, if the force exerted by the cable is 120 N?
A ray of light is travelling from north towards south and it has travelled 49 km until it hit a mirror which reflected the light towards east. The ray of light reflected towards east has travelled 47 km until it hit another mirror which reflected it diagonally towards the initial point which is north. How long is the line reflected towards north diagonally? Round the result to two decimals.
Is silicone a better conductor then silver
A ball thrown vertically upward reaches a certain height and comes down again. What can you say about its kinetic energy at the maximum height?

If the current in the circuit above is 10 amps and the resistance is 3 ohms, what is the voltage?

Answers

It's really difficult to make out the circuit above. Quite frankly, your
question leaves me to wonder how far 'above' it may be.
The best I can do will be to try and fabricate an answer based on the
information given in the text of the question, augmented only by my own
training, chutzpah, and life experiences.

If the circuit ... wherever it is ... consists entirely of the single 3-ohm
resistance and no other components, and the current through the
resistance is 10 Amperes, then

Voltage = (Current) x (resistance) = 30 volts .

Which of these is most likely to lead directly to a black market?a. a supply shock
c. rationing
b. a price floor
d. equilibrium

Answers

Answer:

c. rationing

Explanation:

Which is an example of a good whose price goes down because of improvements in technology? Why did Communist governments use a command economic system for many years? ... Quantity demanded will exceed quantity supplied, so the price will drop. Excess supply means that producers will make less of the good.

I would say it's rationing: if people are only allowed a certain number of something (let's say: bottles of cooking oil), then the people who are entitled to is (as all are) but don't need is as much are likely to try to make profit by trying to sell it on a black market.

All points to the blank of zero on a horizontal number line are negative.

Answers

All points to the left of zero on a horizontal number line are negative. A number line is a picture of a graduated straight line that serves as abstraction for real numbers. This number line can be extended to the left to represent numbers which are smaller than 0. Such numbers are called negative numbers.

All points to the left of zero on a horizontal number line are negative

A man’s mass is 100 pounds on Earth. His weight is 445N. What would change if this man were on the moon? A) His mass
B) His weight
C) His weight and mass
D) Neither the mass or the weight

Answers

Answer: B) weight

Explanation: Your mass does not change on the moon

Could anyone help me figure out d and e? How can you find the work of the friction when the force of friction is not given?

Answers

Wow ! This is not simple, Shoot, and I give you a lot of credit
and an extra merit badge if you're generally keeping up with it.

I scratched my head for a few minutes, and I think I've got it.
Here's what I think is going on:

KE₁ = KE of the box before pushing
   (1/2) (m) (speed²) = 10 x 2² = 40 joules

KE₂ = KE of the box after pushing 3m
   (1/2) (m) (speed²) = 10 x 4² = 160 joules

The box gained (160 - 40) = 120 J of kinetic energy.

Now look at the cluttered force diagram.
Cat's component of force in the direction of motion is 120N.
That's the part of her force that does the work on the box.
How much work does she do ?

   (force) x (distance) = (120N) x (3m) = 360 joules .

Only 120 J of that energy showed up as increased kinetic energy
of the box. The other 240J of her hard-earned work was consumed
by friction.

   Work of friction = (Friction force) x (distance)

   240 J = (friction force) x (3 m)

240 J / 3 m = friction 'force' = 80 N .

I think that's it.

What I did was:

-- Find the work that Cat did.

-- Find the increase in the kinetic energy of the box.

-- The difference ... the 'missing energy' ... was the work done
by friction in the same distance.

Does this do anything for you ?

Which is the only mechanism that can introduce new alleles in a gene pool? genetic drift random mating mutation