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4 years ago

How does viscosity affect flow width?

1 answer:

8 0

The more viscous a substance, the more difficult it will be to spread out and run quickly, so the more viscous a substance, the narrower the flow. (I am not 100% sure, I have only a little experience with fluid dynamics, but as you asked me to answer there is my best shot!)

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A magnetic field is entering into a coil of wire with radius of 2(mm) and 200 turns. The direction of magnetic field makes an an

frozen [14]

Answer:

a) 2.278 x 10^-5 volts

b) 1.139 x 10^-6 Ampere

c) 2.59 x 10^-11 W

Explanation:

The radius of the wire r = 2 mm = 0.002 m

the number of turns N = 200 turns

direction of the magnetic field ∅ = 25°

magnetic field strength B = 0.02 T

varying time = 2 sec

The cross sectional area of the wire = $\pi r^{2}$

==> A = 3.142 x $0.002^{2}$ = 1.257 x 10^-5 m^2

Field flux Φ = BA cos ∅ = 0.02 x 1.257 x 10^-5 x cos 25°

==> Φ = 2.278 x 10^-7 Wb

The induced EMF is given as

E = NdΦ/dt

where dΦ/dt = (2.278 x 10^-7)/2 = 1.139 x 10^-7

E = 200 x 1.139 x 10^-7 = 2.278 x 10^-5 volts

b) If the two ends are connected to a resistor of 20 Ω, the current through the resistor is given as

$I$ = E/R

where R is the resistor

$I$ = (2.278 x 10^-5)/20 = 1.139 x 10^-6 Ampere

c) power delivered to the resistor is given as

P = $I$ E

P = (1.139 x 10^-6) x (2.278 x 10^-5) = 2.59 x 10^-11 W

4 0

3 years ago

what is gravitational potential of a motionless 20kg rock that is 100m above the surface of the earth

Art [367]

Gravitational Potential Energy = mgh.

Where m = mass in kg.
g = acceleration due to gravity = 9.81 m/s2.
h = height in metres.
PE is in Joules

Potential Energy = 20 * 9.81*100 = 19620 J

5 0

3 years ago

A 36,287 kg truck has a momentum of 907,175 kg • . What is the truck’s velocity?

Drupady [299]

Given:
m = 36,287 kg, the mass of the truck
P = 907,175 (kg-m)/s, the truck's momentum.

Let v = the truck's velocity.
By definition, the momentum is
P = m*v
Therefore
v = P/m
= (907175 (kg-m)/s) / (36287 kg)
= 25 m/s

Answer: 25 m/s

7 0

3 years ago

Read 2 more answers

Which observation confused scientists regarding the photoelectric effect? A. Low-intensity light does not always cause electrons

e-lub [12.9K]

Light does not always cause electrons to be emitted.
If it doesn't, then you might think that making the light brighter
would cause electrons to be emitted. That DOESN't work, but
making the light higher FREQUENCY causes electrons to be
emitted !

Did you catch that ? ==> If you light a match next to a piece of metal, and the match burns with a red flame and NO electrons are emitted from the metal, then you can move in with a military searchlight or a ginormous high-power laser that has the same red color and shine it on the metal, and still no electrons will be emitted. But if you light a little match next to the metal and the match burns with a BLUE flame, then electrons WILL be emitted. Knocking electrons out of the metal has nothing to do with how strong and bright the light is. It only depends on the FREQUENCY (color) of the light !

This observation was confusing until the beginning of the 20th Century,
even to the smartest scientists. There was no way to explain it until 1905,
when Albert Einstein pretty much invented Quantum Mechanics to explain
this "Photoelectric Effect".

Of all of Einstein's great discoveries, THIS was the one for which he was
awarded the Nobel Prize in Physics ... in 1922. He never won a Nobel for
his theories of Relativity.

3 0

3 years ago

Ik this is a lot so 15 points and ill give brainliest thank you!! Questions should be very easy tho

Gnesinka [82]

1.plants,most algae and cyanobacteria

2.during photosynthesis cells use carbon dioxide and energy from the sun to make sugar molecules and oxygen

3.carbon dioxide+water---Glucose+oxygen

4.chloryphil

5.it absorbs blue and red good and absorbs green poorly

6 In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle

4 0

3 years ago