1) 20 min = 1/3 h
2) distance = speed * time = 12 * 1/3 = 4 km
Explanation:
If the size and direction of the forces on the object are exactly balanced , then there is no net force acting on the object
When Alfred Wegener proposed the idea the continents could move, other scientists scoffed. ... Plate tectonics -- the concept the continents are rockplates moving on the magma underneath -- is now accepted.Magnetism is part of the evidence forplate tectonic theory.
Answer: B, increase the rate at which he turns the crank
Explanation: i got it right
The answer is D. Isotopes.
Hope that helped.
