PHYSICS HIGH SCHOOL

Electrostatic forces hold which of the following together?Cu atoms and localized electrons in copper

K+ and Br in KBr

He atoms in helium gas

oxygen and hydrogen atoms in OH

Answers

Answer 1
Answer: The best and most correct answer among the choices provided by your question is the first choice.

Electrostatic forces hold Cu atoms and localized electrons in copper together.

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Ok I'm doing physics gragh an I don't know how to find the impulse on a graph

Answers


OK instead of telling us what you don't know, it would actually be much more helpful if we could talk about what you DO know.

What is it a graph of ? 

-- Impulse is (force applied) x (time the force persists).
Is there force or time anywhere on the graph ?
Is there acceleration anywhere on the graph, and do you know the mass ?
With acceleration and mass, you could calculate the force.

-- Impulse is also the change in momentum.
Is there momentum anywhere on the graph ?
Is there speed anywhere on the graph, and do you know the mass ?
With speed and mass, you can calculate the momentum.

We can use what you know to solve the problem.  But we cannot use
what you don't know to solve the problem.

I just had the coolest idea:  What if you took a picture of the Physics gragh
that you're doing, and post it here along with your question ? !  Then we
would have the same information that you have, and we could show you
how to use it.

A measurement that has both magnitude and direction

Answers

A measurementthat both magnitude and direction is a vector quantity. An example of this is amoving car. The car exerts force due to its thrust and weight that runs in it. Thiswill give us the magnitude of the car. The resulting motion of the car in termsof displacement, velocity and acceleration that determines its direction makesit a vector quantity. On the other hand, a measurement that has only magnitude isa scalar quantity. The energy exerted by the engine of the car is a scalarquantity.

What the unit for electric current

Answers

The unit of electric current is the Ampere.

1 Ampere of current means that if you set up your chair and
stare at the electrons flowing past one point in the circuit, you'll
see 1 coulomb of charge passing that point every second.

How will you recognize 1 coulomb of charge ?
Well, every electron carries the same amount of charge, and
we know how much that is.  (Read about the Millikan oil-drop
experiment in 1909.)  So we know how many electrons it takes
to carry 1 coulomb of charge past the point you're watching.

All you have to do is count the electrons as they zip past.
Every time you count  6,241,509,343,000,000,000 electrons,
you can tick off 1 coulomb of total charge that they're carrying.
If you reach that count every second, you know the current
passing that point is 1 Ampere.

Answer: amps

Explanation:

Animals in cold climates often depend on two layers of insulation: a layer of body fat [of thermal conductivity 0.200W/(m⋅K) ] surrounded by a layer of air trapped inside fur or down. We can model a black bear (Ursus americanus) as a sphere 1.60m in diameter having a layer of fat 3.90cm thick. (Actually, the thickness varies with the season, but we are interested in hibernation, when the fat layer is thickest.) In studies of bear hibernation, it was found that the outer surface layer of the fur is at 2.80∘C during hibernation, while the inner surface of the fat layer is at 30.9∘C a) What should the temperature at the fat-inner fur boundary be so that the bear loses heat at a rate of 51.4W ? b) How thick should the air layer (contained within the fur) be so that the bear loses heat at a rate of 51.4W ?

Answers

A) The temperature at the fat-inner fur boundary be so that the bear loses heat at a rate of 51.4W is; T_i = 38.52°C

B) The thickness of the layer contained within the fur so that the bear loses heat at a rate of 51.4 W is; t = 13.41 cm

We are given;

Diameter of sphere; d = 1.6 m

Radius of sphere; r = d/2

r = 1.6/2

r = 0.8 m

Thickness of bear; t = 3.9 cm cm = 0.039 m

Outer surface Temperature of fur; T_h = 2.8 ∘C

Inner surface Temperature of fat;T_f = 30.9 ∘C

Thermal conductivity of fat; K_f = 0.2 W/m⋅k

Thermal conductivity of air; K_a = 0.024 W/m⋅k

A) To find the temperature at the fat-inner fur boundary when heat loss is 51.4 W, we will use the heat current formula;

H = K_f•A(T_f - T_i)/t

Where;

A is area = 4πr²

A = 4π × 0.8²

A = 8.04 m²

T_i is the temperature we are looking for

H is heat loss = 51.4

t is thickness

Making T_i the subject gives;

T_i = (T_f × H × t)/(K_f × A)

T_i = (30.9 × 51.4 × 0.039)/(0.2 × 8.04)

T_i = 38.52°C

B) We want to find the thickness of the layer contained within the fur. Thus, we will use K_a instead of K_f. Let us make t the subject in the heat current formula to get;

t = (K_a•A(T_i - T_h)/H

t = (0.024 × 8.04 × (38.52 - 2.8))/51.4

t = 0.1341 m

t = 13.41 cm

Read more at; brainly.com/question/14548124

Answer:

Explanation:

Using the equation

H = Q/t = k A ( T hot - T cold) / L

where H is the rate of heat loss = 51.4 W, T cold be temperature of the outer surface, A is the surface area of the fat layer which is a model of sphere ( surface area of a sphere ) = 4πr² where diameter = 1.60 m

radius = 1.60 m / 2 = 0.80 m

A = 4 × 3.142 × ( 0.8²) = 8.04352 m²

making T cold subject of the formula

T cold =  T hot -   (HL)/(KA)  = 30.9° C - ( 51.4 W × 3.9 × 10⁻² m) / ( 0.2 W/mK × 8.04352 m² ) =  30.9° C - 1.25 ° C = 29.65° C

b) The thickness of air layer for the bear to lose heat t a rate of 51.4 W

thermal conductivity of air is 0.024 W/mK and rearranging the earlier formula

L = \frac{kA( T HOT - T COLD )}H} = (0.024 W/ m K × 8.04352 m²) ( 29.65° C - 2.8°C) / 51.4 W = 0.101 m = 10.1 m

The Doppler effect suggests that sound waves are relative to the observer. You know if an object is coming or going from the sound it makes. Light waves follow the Doppler effect also. However, instead of sound changing, you know if an object is coming or going _____.

Answers

A similar principle is observed with light as it is with sound. If an object is moving away from you the wavelengths gets longer, and towards the red light spectrum of the visible light spectrum, whereas if an object is moving towards you the wavelength will decrease towards the blue end of the spectrum

Answer:

from the color of the light

Explanation:

A space vehicle deploys its re-entry parachute when it's traveling at a vertical velocity of -150 meters/second (negative because the parachute is going down.) It comes to rest at 0 meters/second after 30 seconds. What's the average acceleration of the shuttle during this time span?

Answers

Acceleration, in physics, is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law.
a = change in velocity / change in timea = 0 - (-150) / 30 - 0a = 5 m/s2
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