Arope and pulley system is used to lift a box that weighs 90 newton’s. how much force do you need to pull on the rope if the machine has a mechanical advantage of 5?

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

Atelevision set that has been running for a while heats up even the air around it. which two laws of thermodynamics could be used to analyze this scenario

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87