Cathy is moving into a tenth-floor apartment. she has a grand piano that weighs 570 pounds and is too big to fit in the elevator or in the stairwell.

which simple machines would make it easiest for cathy to get her grand piano up to her new apartment?
a.
wheels and axles
b.
inclined planes
c.
screws
d.
pulleys

How does convection affect our atmosphere? our layers of earth? our oceans?

An object starts from rest at point f and speeds up continuously as it moves around an oval. a. choose a point about 1/8 th of the way around the oval from point f, and label it point g. draw a vector to represent the velocity of the object at point g. b. determine the change in velocity vector   between points f and g.

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?