What is the force that acts on an object and opposes its motion called?

A stream begins at an elevation of 1000 feet and flows a distance of 200 miles to the ocean. what is the average gradient?

A particle with a charge of - 1.24 x 10"° C is moving with instantaneous velocity (4.19 X 104 m/s) î + (-3.85 X 104 m/s) j. What is the force exerted on this particle by a magnetic field (a) = B (1.40 T) i and (b) È = (1.40 T) k?

A jumbo jet must reach a speed of 360 km/h ( = 225 mi/h) on the runway for takeoff. assuming a constant acceleration and a runway 1.50 km long, what minimum acceleration from rest is required?

Why were the rings of Uranus not observed directly from telescopes on the ground on Earth? How were they discovered?

Xavier is roller skating at 14 km/h and tosses a set of keys on the ground at 8 km/h. The speed of the keys relative to the ground is km/h.

What is general relativity in easy terms?

Temperature and volume are directly or inversely

My Notes A basketball rolls across a classroom floor without slipping, with its center of mass moving at a certain speed. A block of ice of the same mass is set sliding across the floor with the same speed along a parallel line.

How does sound travel through waves?

Solve for real t: - 25=20t-5t^2