A calorimeter contains 1.25 kg of water at 21.5°C. A 0.15-kg block of an unknown substance at 65.5°C is placed in the water. The final temperature of the system is 22.0°C. What is the specific heat of the substance? What could the substance be? ​

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive

Apotter's wheel moves uniformly from rest to an angular speed of 0.20 rev/s in 32.0 s. (a) find its angular acceleration in radians per second per second. rad/s2 (b) would doubling the angular acceleration during the given period have doubled final angular speed?