A cat with a mass of 4.5 kg is resting on top of a bookshelf that is 3 m tall. What is the cat's potential energy?

Which statement best explains why an object weight less on mercury than it does on earth

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

If element x has 99 protons how many electrons does it have