It's true that mechanical waves require a medium for transmission.
Upper Mantle produces the magma that causes seafloor spreading and volcanoes. Other term for that is the lithosphere. It is a solid, outer part of the Earth, extending depth of around 100 kilometers. it includes the crust and the brittle upper portion of the mantle. It is the coolest and most rigid part of Earth.
Answer:
74N
Explanation:
force = mass * acceleration
force = 20 * 3.7
force = 74N
Electrical force is the repulsive or attractive force of attraction between any two charged bodies. it is possible to calculate electric force on anything that runs on batteries or uses a plug. Its net effect can be explained using newtons law of motion like any force.
From the coulombs law; F = k (q1║q2)/ r²
Where k = 9 ×10∧9 N.m².C∧-2, r12= 0.285m, q2= +6μC and q1 = 4.86 nC
substituting values in the equation
the net electrical force acting on the +6ц C charge is 5.4 N.
Sound energy is produced when an object vibrates. The sound vibrations cause waves of pressure that travel through a medium, such as air, water, wood or metal. Sound energy is a form of mechanical energy.
