An object is dropped from the top of a 200 m tower. its height above the ground after t seconds is 200 - 4.9t^2. how fast falling after 3 seconds

Forces holding particles together are strongest in a

For the equation 3Cu + 8HNO3 → 3Cu (NO3) 2 + 2NO + 4H2O, how many units of NO3 are represented on the products side? A) 2 B) 3 C) 6 D) 8

Can an object accelerate yet neither sped up nor slow down?

how do kinetic energy, gravitational potential energy and heat due to friction change as the marble rolls down the ramp

You shine a laser beam through a grating with a known number of slits per millimeter and observe a pattern on a screen. Then you cover half of the grating with nontransparent material. What will you see

An ecosystem is all the populations of organisms that live together and A. the microorganisms that depend on them. B. the organisms that generate energy from sunlight. C. the physical factors with which they interact. D.

Which statement about magnetic poles is accurate? A) Same magnetic poles attract, while different magnetic poles repel. B) Same magnetic poles attract, while different magnetic poles attract.

Power is measured in: A) J/s B) J2/s C) s/J D) s2/J

The amount or the strength of force is called its

An airplane in flight has a pressure difference between the lower and upper wing surface; this provides an upward force that balances the weight of the plane.