The image shows a girl using a lever to lift. Explain why she needs to apply a relatively small force in order to lift the rock

What are two different ways you could find the value of a? explain these methods.

If water vapor with the mass of 35.0 grams is cooled and condensed into water in a closed system such as a closed glass jar, what is the mass of the water after the water vapor completely condenses? a) 34.5 grams b) 35.0 grams c) 35.5 grams d) the mass cannot be determined without knowing the volume

First to answer will be the brainliest i need the answer asap