According to Ptolemy's model of the movement of celestial bodies, A. the sun is the center of the universe. B. the earth rotates around the moon. C. planets orbit in circular paths around the earth. D. the earth rotates around the sun.

Because there is very little friction, the lever is an extremely efficient simple machine. using a 90.0% efficient lever, what input work is required to lift a (n) 19.0 kg mass through a distance of 45 cm? 3232 incorrect: your answer is incorrect.

An object buoyant force and wieght arent the smae thing

10. A 7,500 N force is applied by a crane in lifting a load to a height of 15 min 5 s. What is the work done in J?

The nebular theory also predicts that the cloud should heat up as it collapses. what physical law explains why it heats up?

The temperature of an aluminum disk is increased by 250 ∘C∘C. By what percentage does its volume increase?

A zebra starts from rest and accelerates at 1.9 m/s2 what will be the acceleration after 5 seconds

When you measure the temperature of an object you are measuring

What are two ways the Doppler effect can be applied in everyday life?

The two dry sand samples are examined by changing one parameter. The independent variable, the one that is intentionally manipulated between the two samples, is the (temperature over time, mass of each sample, or type of material used)

What is the unit of G in the F=Gm1m2/r^2