PHYSICS HIGH SCHOOL

The type of radiation that will penetrate farthest into a material isA. a beta ray.


B. a gamma ray.


C. an X-ray.


D. an alpha ray.


E. They all penetrate material the same distance

Answers

Answer 1
Answer: my answer is E.  If am wrong then plz tell me whats the right

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The speed of a wave is determined by multiplying the wavelength by the frequency

Answers


Wellll . . . that's not a very easy way to do it.  You'd still need
to figure out a way to measure the wavelength AND a way to
measure the frequency, so you won't find many engineers
actually trying to determine the wave speed by doing all of that.

But your statement is correct.  The product of

                       (wavelength) times (frequency)

IS the speed of the wave.

As a diligent physics student, you carry out physics experiments at every opportunity. At this opportunity, you carry a 1.05 m 1.05 m long rod as you jog at 3.27 m/s 3.27 m/s , holding the rod perpendicular to your direction of motion. What is the strength of the magnetic field that is perpendicular to both the rod and your direction of motion and that induces an EMF of 0.275 mV 0.275 mV across the rod? Express the answer in milliteslas.

Answers

Answer:

The strength of the magnetic field is 0.08 mT

Explanation:

Given:

Length of rod l = 1.05 m

Velocity of rod v = 3.27(m)/(s)

Induced emf \epsilon = 0.275 * 10^(-3) V

According to the faraday's law

We know that the induced emf of rod is given by,

   \epsilon = Blv

Where B = magnetic field

For finding the magnetic field,

   B = (\epsilon )/(lv)

   B = (0.275 * 10^(-3) )/(1.05 * 3.27)

   B = 0.08 * 10^(-3)

   B = 0.08 mT

Therefore, the strength of the magnetic field is 0.08 mT

A standing wave has a frequency of 471 Hz and a wavelength of 1.9. What is the speed of thewave? (Round to the 2nd number after the decimal)
1
I REALLY NEED HELP !

Answers

Answer:

c = 894.90 m/s

Explanation:

Given data:

Frequency of wave = 471 Hz

Wavelength of wave = 1.9 m

Speed of wave = ?

Solution:

Formula:

Speed of wave = frequency × wavelength

c = f×λ

c = 471 Hz × 1.9 m

  Hz = s⁻¹

c = 471s⁻¹ × 1.9 m

c = 894.90 m/s

The speed of wave is 894.90 m/s.

Hi all! I’m struggling with solving this section in a physics test. Especially the last point.

Answers

Answer:

Explanation:

We should know that the gradient(slope) of a distance-time graph is the speed, and the gradient of a velocity-time graph is the acceleration.

a) Since the gradient from t=80 to 160 is 0, the speed is 0, indicating it is at rest.

b)To find the speed, we find the gradient of the graph at t=40. Since it is a straight line from t=40 to 60, we can do this simply by

Gradient = (200-120)/(60-40)=80/20=4 (This is an estimate since the graph is not clear, instead of t=40 and t=60, you can use any two points along that straight line (from about t=20 to 60))

c)The one on the right is the velocity graph, and the one on the left shows acceleration. We can know this by analysing some points. For example, and t=50, the right graph is about constant at 5, while the left one is 0. This would indicate that the left one shows the gradient of the right (gradient of a constant portion is 0). We can choose another place on the right graph, say t=60 to 80. The curve is decreasing. The left graph for this same time period is negative. This reaffirms our guess, since the gradient of a decreasing curve should be negative.

If you want to do it the other way around, you can analyse the left graph. From about t=15 to t=30 the graph is decreasing. Thus its slope should be negative. However, the right graph is positive for this period. This means that the right graph definately does not show the slope of the left.

When you learn about calculus and derivatives, these will become much clearer :)

The light in this diagram is producing light.Which best describes the process of energy conversion to accomplish this?



A.
Electrical energy turns the rod. This energizes the coil. The magnetized coil generates an electric current. The electric current goes through the wires to power the lightbulb.

B.
Mechanical energy turns the rod. This electrifies the coil. The electrified coil generates a magnetic field. The magnetic field goes through the wires as electricity to power the lightbulb.

C.
Mechanical energy turns the rod. This magnetizes the coil. The magnetized coil generates an electric current. The electric current goes through the wires to power the lightbulb.

D.
The magnetic energy in the coil turns the rod. The rod generates an electric current. The electric current goes through the wires to power the lightbulb.

Answers

It could be D or B. I'ts a hard question, but I'm going with B. Hope I got you the right answer. :)
I think the one that describes the process of energy is B. It shows step through step and at the end it tells you how. I hope this helped.

your friend wants to know the amount of salt added to her favorite fast food French fries. what would you recommend that she do to find out the amount of salt ?

Answers


Every fast-food chain is required by law to make the nutrition content of the
items on its menu publicly available.

My friend should walk into her favorite place, or into the nearest McRonald's,
Bendy's, Tennessee Fried Turkey, Bulgur King, Plucky Please, White Palace,
Pita Hut, Carl's Senior, Back in the Box, or any of those others, ask to see
the Manager, and ask the manager for a chart of nutritional information that
includes their french fries. 

To be nice about it, she should do this at a time when the place is not too busy,
and the manager doesn't have a lot of more-important things that need to be
doneright now.

Under the french fries, look at the serving size, and the figure for "Sodium"
in that serving, which is the nutrient that your body gets from salt.  Less is
better.  More is worse.  For an adult, the CDC Institute of Medicine says
that 1500mg a day is 'adequate' for an adult.  The US Food and Drug
Administration recommends that adults should get 'no more than' 2300mg
in a day. People who have high blood pressure are supposed to watch it,
and take in a lot less sodium. 

And there are organizations with official-sounding names that totally dispute
all of this.

But to answer your question, that's what she should do to learn the amount
of salt used at the place where likes to get her french fries.


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