icw 17a a 250 lb block is subjexted to a horizontal force p. the coefficient of friction between the block and surface is 0.2 determine the force P required to start moving the block up the incline

424.773N

Explanation:

Taking the sum of force along the incline. The forces acting along the incline is the moving force P and the frictional force Ff

P = mgsintheta

Ff = nR = nmgcostheta

n is the coefficient of friction

R is the normal reaction

m is the mass of the block

g is the acceleration due to gravity

Hence the force P required to start moving the block up the incline is 424.773N

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me