A luggage handler pulls a 15 kg suitcase up a ramp inclined at an angle 30⁰ above the horizontal by a horizontal force F of magnitude 180 N. The coefficient of kinetic friction between the ramp and the suitcase is 0.25. If the suitcase travels 1.9 m along the ramp, calculate (a) The work done on the suitcase by F (b) The work done on the suitcase by gravity (c) The work done on the suitcase by friction (d) The work done on the suitcase by normal force (e) If the package started from rest, what is its speed after it has travelled 1.9 m?

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?