Determine the stiffness of the spring to hold the 85-kg crate in the position shown.

Which travels at the greatest speed? A. sound through air B. light through glass C. sound through water D. light through a vacuum

Raindrops fall vertically at 7.5 m/s relative to the Earth. What does an observer in a car moving at 20.2 m/s in a straight line measure as the velocity of the raindrops? (Assume the car is moving to the right and that the + x-axis is to the right.

What happens when a wave hits a boundary?

If you are able to see an object, how can you be sure that it is not at absolute zero? a. Objects are never actually at absolute zero c. Objects at absolute zero are too small to see b.

A natural force of attraction exerted by the earth upon objects, that pulls objects towards earth's center is called

What must be your car's average speed in order to travel 235km in 3.25 hours?

At a certain location, the horizontal component of the earth's magnetic field is 2.5 * 10-5 T, due north. A proton moves eastward with just the right speed for the magnetic force on it to balance its weight. Find the speed of the proton.

An acrobatic airplane performs a loop at an airshow. The centripetal acceleration the plane experiences is 14.7 m/s2. If it takes the pilot 45.

Which of the following was NOT an outcome of Bacon's rebellion? A. A more direct focus on the "Indian Problem" B. A more focused plain to isolate black slaves from white servants C.

A science class did an investigation to see how many breaths it took for each student to blow up a balloon. Jason blew up his balloon with the fewest breaths. Which of these might explain why Jason took fewer breaths to blow up his balloon? A.