PHYSICS HIGH SCHOOL

Which is an example of velocity?A. A pickup driving 30 km in 20 minutes
B. A car slowing down on a sharp curve
C. An airplane traveling 450 km/h
D. An 18 wheeler driving west at 50 km/h
PLZ help

Answers

Answer 1
Answer: D because it includes both acceleration and direction.
Answer 2
Answer: A
Velocity is the rate of motion, speed or action

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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 ?

Force of attraction between the Earth(m=5.98x10^24) and a 70 kg student. distance of 6.38x10^6

Answers

F=G(m₁m₂/r²)
= 9.81(70*5.98x10²⁴/6.38x10⁶)
=9.81(6.56x10³¹)
=6.44x10³²

An electromagnetic wave is composed of electrical and magnetic energy. true or false

Answers

it is false it is a metle core

The term “radiation” refers to hot materials inside the Earth rising towards Earth’s surface, cooling, and sinking back down.

Answers

No, that's not a true statement.  The process you've detailed
is a perfect description of "convection", not radiation.

A bowling ball with a mass of 4.5 kg travels at a velocity of 37 m/s for 2.5 s until it is stopped at the end of the lane by the ball return. What additional information is required to determine the weight of the bowling ball?a. the speed at which the ball return captured the ball
b. the amount of friction from the bowling lane acting on the bowling ball
c. the acceleration due to gravity acting on the bowling ball
d. the force the bowler applied to the bowling ball

Answers


No additional information is required.  We can calculate,
or simply write down, each of those answers now.

A).  The weight of the ball:

    Weight = (mass) x (gravity) = (4.5 kg) x (9.8 m/s²) = 44.1 newtons

B).  Friction acting on the ball:

       You said that the ball travels with speed of 37 m/s for
       2.5 seconds.  Since the speed of the ball is constant,
       there can't be any friction acting on it.  If there were any,
       then it would lose kinetic energy, and its speed would be
       decreasing.

C).  The acceleration due to gravity is 9.8 m/s² ... IF this story is
        taking place on Earth.

D).  Welll, you caught me.  I can't answer this one without
more information.

The bowler applied force to the ball, and accelerated it from
no speed up to 37 m/s.  In order to figure out the acceleration,
I would need to know how long he spent doing it. 

But wait !  You know what ?  Now that I think of it, we would need
a WHOLE LOT of additional information to answer this part, and
we probably still could not answer it. 

The ball didn't get its entire speed of 37 m/s from the bowler pushing
on it.  We don't put bowling balls down on the floor and accelerate
them with constant force.  We swing them up behind us, and let
gravity accelerate them as they swing down like a pendulum. 
So a lot of the force that accelerates the ball comes from gravity,
the rest comes from the bowler, and the amount is different for
every bowler.

So I'm going to say that d). can't be answered at all, period.

And by the way ... one more comment:

37 m/s is just about 83 miles per hour !  I'm not sure the ball return
is going to stop that thing, and I'd want to get out of the way if I were
you or one of the pins !

Assuming the same current is running through two separate coils, why is it easier to thrust a magnet into a wire coil with one loop than one with four loops?.

Answers

The magnetic field strength in a coil is directly proportional to the number of turns, or loops, in the coil.
Therefore, when there are four loops instead of one, the magnetic field strength has increased four times, making it harder to push the magnet in.

Answer:

Plato/Edmentum Answer

Explanation:

D. because the magnetic field is weaker

Which statement about transuranium elements is NOT true?A.) They have an atomic number above 92
B.) They are radioactive
C.) They can be synthesized
D.) They are common in nature

Answers

Transuranium elements are the elements with atomic numbers greater than 92. All of these elements are unstable and decay radioactively into other elements. The statement about transuranium element that is not true is that they are common in nature. The answer is letter D.

The statement about transuranium element that is not true is that they are common in nature. The

answer is letter D.
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