PHYSICS HIGH SCHOOL

What is a normal force?

Answers

Answer 1
Answer: is the component perpendicular to the surface on contact  of the  contact force  

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Speed of wave can change ifA) none of the other choices
B) pressure changes
C) temp changes
D) all the other choices
E)enters new medium

Answers

B- the pressure changes

What is relative velocity?​

Answers

Relative velocity is the velocity of an object or observer B in the rest frame of another object or observer A

Answer:

the velocity of a moving body relative to another body is called relative velocity.

What is the best classification for this sample of crude oil?

Answers

Most oil classification experts will tell you that you've got to see it,
smell it, weigh it, and feel it before you can classify it.  The absolute
minimum is to SEE it, or else have somebody describe it to you. 
At the moment, we are totally bereft of any information regarding
your sample, so we're in no position to classify it.  We can't even
be sure that you really DO have a sample of crude there.  For all
we know, you may be just joshin', waiting to see if we'll take the bait.
mixture of different hydrocarbons

Most atoms in the Sun exist as:

A)solids
B)liquids
C)plasma

Answers

Most atoms in the Sun exist as Plasma, god bless u
u did it the way i asked. nice lol. its plasma btw

Because of convection, the warmest air in a room A. spreads out in all directions.
B. rises toward the ceiling.
C. transfers heat to the walls.
D. sinks toward the floor.

Answers

The correct choice is
B. rises toward the ceiling
In fact, the warmest air is also the air with least density: in warm air, the particles move faster, so the distance between them is larger, on average. Therefore, the warmest air is less dense, and because of that it tends to flow upwards (due to Archimede's principle) and it is replaced by the colder air, creating the so-called convection current.

PLEASE HELP. A substance decays according the the equation ae^-0.0025t, where t is in minutes. Find the half life of the substance. Round to the nearest tenth.

Answers


First of all, that's not an equation.  An equation needs an 'equals' sign ( = ),
so you need something like 

               Amount present = a e^-0.0025t .

                                   'a' = amount present when t = 0 .

The half-life is the time it takes for the original amount to decay to half of it.

That's just 't' when                      e^-0.0025t  =  1/2

Take the natural log of each side:    -0.0025t  =  ln(0.5)

Divide each side by  -0.0025 :        t = ln(0.5) / (-0.0025) =

                                                     (-0.69315) / (-0.0025) =

                                                   t  =  277.26 minutes

                                                    ( 4hrs 37min 15.5sec)

Rounded to nearest tenth:  t = 277.3 minutes .
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