A2430 pound roller coaster starts from rest and is launched such that it crests a 105 ft high hill with a speed of 59 mph. the roller coaster travels 396 ft in reaching the top of the hill and there is a constant drag force of 85 pounds. determine launch energy

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.