Weegy: A car that increases its speed from 20 km/h to 100 km/h undergoes 'positive' acceleration.
User:
3.
In a closed system, the loss of momentum of one object ____________________ the gain in momentum of another object.
Weegy: In a closed system, the loss of momentum of one object is Equal To the gain in momentum of another object.
User:
4.
The universal force that is effective over the longest distances is ____________________.
Weegy: The force that is most effective over the longest distances are nuclear forces.
Strong nuclear forces and weak nuclear forces. [ Gravity is the weakest of the four. ]
User: As an object’s temperature increases, the ____________________ at which it radiates energy increases.
Weegy: As an object?s temperature increases, the faster its constituent particles move at which it radiates energy increases.
All macroscopic objects?fires, ice cubes, people, stars?emit radiation at all times, regardless of their size, shape, [ or chemical composition. They radiate mainly because the microscopic charged particles they are made up of are in constantly varying random motion, and whenever charges change their state of motion, electromagnetic radiation is emitted. The temperature of an object is a direct measure of the amount of microscopic motion within it. The hotter the object?that is, the higher its temperature?the faster its constituent particles move and the more energy they radiate. ]
User:
6.
When a person plucks a guitar string, the number of half wavelengths that fit into the length of the string determines the ____________________ of the sound produced.
Weegy: pitch or frequency
(More) 