What does it means for a substance to have a high reactivity

A 68.5-kg skater moving initially at 2.40 m>s on rough horizontal ice comes to rest uniformly in 3.52 s due to friction from the ice. what force does friction exert on the skater?

Why did Thomson's results from experimenting with cathode rays a big change in scientific thought about atoms?

Is the temperature of a normal healthy old man is less than that of a normal healthy young man?

Mandy is testing an unknown solution to determine whether it is an acid or a base. She places a piece of red litmus paper into the solution and the paper turns blue. What is her unknown solution?

Which factors affect the speed of ocean waves?

During a snowball fight two balls with masses of 0.4 kg and 0.6 kg, respectively, are thrown in such a manner that they meet head on and combine to form a single mass of 1 kg. the magnitude of intial velocity foreach is 15 m/s.

Which phases of matter do molecules have the lowest amount of energy?

How many Oxygen (O) atoms are in the following? H2O + CO2 4 3 2

How does surface roughness affect friction

Why does it hurt your hands when you carry heavy shopping in carrier bags?