You are testing a new amusement park roller coaster with an empty car with a mass of 130 kg. one part of the track is a vertical loop with a radius of 12.0 m. at the bottom of the loop (point a) the car has a speed of 25.0 m/s and at the top of the loop (point b) it has speed of 8.00 m/s.

Work done by friction along the motion is given as

Explanation:

As per work energy theorem we can say

Work done by all forces = change in kinetic energy of the system

so here car is moving from bottom to top

so here the change in kinetic energy is total work done on the car

so here we will have

now plug in all data in it

it is because acrylic blanket have acrylic textile fiber

explanation:

its is better than wool blanket

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.