A person walks north for 5 miles, then south for 8 miles, and then north for 6 more miles. The entire trip takes 8 hours. Distance travelled: miles
Displacement: miles
Average speed during trip: miles/hour
Average velocity during trip: miles per hour (north or south?)

Which of these will change if the air in aclosed bottle is heated? abcdthe mass of the airthe composition of the airthe air pressure in the bottlethe number of air molecules in the bottle

Embryos of different species look very similar, which shows that the organisms share a ancestor.

One of the hopes for solving the world's energy problem is to make use of the fusion reaction 21h +31h --> 42he + 10n + energy how much energy is released when 1 mol of deuterium is fused with 1 mol of tritium according to the above reaction? the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. the speed of light is 2.9979 x 108 m/s.