PHYSICS HIGH SCHOOL

Mechanical waves can travel through _______. vacuums only


both vacuums and mediums


mediums only

Answers

Answer 1
Answer:

mediums only, mechanical waves always propagate through medium

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If the velocity of an object changes from 65 m/s to 98 m/s during a time interval of 12 s, what is the acceleration of the object?
Moons orbit planets and planets orbit theSun.  Is Kepler’s constant the same for both circumstances?  
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Placing ice on a sprained ankle this is an example of conduction, convection, radiation?

What sort of process converts the mechanized energy in the ocean into electricity?

Answers

I think it is the wave energy. 
Wave energy also known as the ocean energy is the energy harnessed from the ocean or sea waves. It is a source of power that comes from the endless march of the waves as they roll into the shore then back out. Using wave energy is advantageous as they are environmental friendly as there are no harmful byproducts, and also the energy from waves can be taken directly into electricity-producing machinery and used to power generators. 

What is the Earth's magnetic field is known asa. electrosphere
b. biosphere
c. asthenosphere
d. magnetosphere

Answers

The correct answer is magnetosphere.
hello

the earh's magnetic field  is known as 
magnetosphere

I hope it helps  you

Balanced forces acting on an object cause the object to accelerate. true or false

Answers

Balanced forces that is acting on an object will NOT cause the object to accelerate, instead it will cause Static Equilibrium-the object is at rest. For example, a book is on the table and there is a downward force because of the gravity but also there is an upward force from the surface that helps to balance the weight of an object which is called a support force. It happens that the net force of an object is equal to zero, means ALL OF THE FORCE CANCEL OUT! Which leads us to the conclusion that, balanced forces will cause an object to be at rest and not to accelerate.

Which of these is equivalent to the law of conservation of energy?A. The total mechanical energy is always conserved.
B. Friction is a nonconservative force.
C. Kinetic energy can be transformed into thermal energy.
D. The total energy of all types remains the same in a closed system.

Answers

The Law of the Conservation of Energy is stating that the total mechanical energy is always conserved or in simpler terms, not used or saved.

Answer: The correct option A.

Explanation:

  • Law of conservation of energy states that energy can neither be created nor be destroyed. But it can be transformed from one form to another.
  • Law of conservation of Mechanical energy  states that mechanical energy of the closed system remain constant until dissipative forces are absent. This means that potential energy gets converted in kinetic energy or vice versa.

Mechanical energy is defined as the sum of the both potential and kinetic energies.

M.E = P.E + K.E

So, from the given options the correct answer is option A.

A particle with velocity v(t)=1/t​−3, in m/s, moves in a straight line. Its initial displacement is known to be s(1)=1, in m. Find the position function s(t).

Answers

Answer:

s(t) = (t1 - t2)* [((1/t1 - 3) + (1/t0 - 3))/2]

Explanation:

We will assume that v(t) is in units of m/s and t (time) is in seconds.

v(t)=1/t​−3

At time 0 (initial) the equation tells us the particle has a velocity of

v(t)=1/t​−3

v(0)=1/(0)​−3

v(0) = - 3 m/s

The particle is moving from right to left (the negative sign) at a rate of 3 m/s.

The position of the particle would be the average velocity times the time traveled.

Distance = Velocity x Time  (with Velocity being the average between times t0 and t1)

We'll use s(t) for displacement for time t.

 s(t) = v*t

We need the average velocity for the time period t0 to t1.

Let t0 and t1 be the initial and final times in which the measurement takes place.

At time t0 the velocity is = 1/t0 - 3

At time t1 the velocity is = 1/t1 - 3

The displacement is the average velocity between the two points, t0 and t1.  This can be written as:

 [(1/t1 - 3) + (1/t0 - 3)/\]/2

Displacement: s(t) = (t1 - t2)* [((1/t1 - 3) + (1/t0 - 3))/2]

   

What group does paracetamol come under

Answers

Paracetamol is grouped within the 'painkillers' category. 
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