13. Students are investigating how mass affects the force needed to move an object. They attached a wooden block to a spring scale and placed a 10 g mass
on top of the block and pulled it 50 cm across the table. Which of the following
changes to their setup would result in a larger force reading on the spring scale?
Bock with 10g mass
Force shown on
spring scale
50cm

1.Sliding the block 60 cm

2.Using a bigger spring scale,

3.Using a 20 g mass

4.Using a circular piece of wood,

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

The energy equivalent of the rest mass of an electron is