Joe wanted to experiment with different factors that affect the freezing rate of water. he put two cups of water into each of two identical glass bowls. next, he stirred sugar into the water in one of the bowls, and he put both bowls in the freezer. he checked their temperatures after one hour, and measured how much water was still liquid in each bowl. what was the variable that changed in this experiment? a. the amount of time each bowl was left in the freezer b. the amount of sugar mixed into each bowl c. the size and shape of each bowl d. the amount of water each bowl contained

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.