The following image shows a red object moving in uniform circular motion. The black circle represents the path of the object; the black arrow represents the genral motion of the object and the red dot represents the object moving in a circle. The purple arrow can represent two different things about the red dot. What does the purple arrow represent?​

How much heat is required to convert 0.3 kg of ice at 0°c to water at the same temperature

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?