Atoy rocket is launched vertically from ground level (y = 0.00 m), at time t = 0.00 s. the rocket engine provides constant upward acceleration during the burn phase. at the instant of engine burnout, the rocket has risen to 78 m and acquired a velocity of 40 m/s. the rocket continues to rise in unpowered flight, reaches maximum height, and falls back to the ground with negligible air resistance. the speed of the rocket upon impact on the ground is closest to

Kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energy b. motion energy c. sound energy d. thermal energy

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?