Pop rocks and soda..... baking soda and vinegar ...
Answer:
wavelength refers to the length of a wave from one peak to the next.the amplitude of a wave Is measured from the peak to the trough
Answer:
45000 J
Explanation: multiply the 4500 N by the 10 m
Answer:

Explanation:
As we know that current density is ratio of current and area of the crossection
now we have

so the current through the wire is given as

now we have

here we have

now plug in the values in above equation

now we have


now plug in both limits as mentioned


here R = 2.11 mm


Before going to answer this question, first we have to understand centripetal force.
The centripetal force is the force which is required to keep the body along its circular path.The direction of the force is along the radius and towards the centre.

Here m is the mass of the body,v is the velocity of the body and r is the radius of the circular path.
When a body moves in a circular path,its velocity at any point is the tangent drawn at that point.
As centripetal force acts along the radius, it must be perpendicular to the velocity of the body.
Hence the correct answer to the question is- It acts perpendicular to the velocity and is directed toward the center of the circle.