Marie and calvin tried to dissolve 45 grams of kno3 in 100 grams of water at 25oc. only 40 grams dissolved; 5 grams settled at the bottom of the beaker. the solution is then said to be at 25oc.

In a system, when potential energy decreases, then entropy also decreases. true false

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n