During a lab activity, students prepared two solutions separately at the same temperature. later they mixed the solutions and the temperature dropped. why? a. there was no energy input during the chemical reaction. b. energy was absorbed during the chemical reaction. c. energy was released during the chemical reaction. d. the temperature of the surroundings dropped.

Of is j/kg·k. if a 2.6 kg of isk to k,is ?

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.

Contrast the force of gravity between these pairs of objects: 1-kg mass and a 2-kg mass that are 1 m apart; a 1-kg mass and a 2-kg mass that are 2 m apart; and two 2=kg masses that are 1 m apart. i dont understand.