Eratosthenes used what object to determine the size of Earth? A) Pyramids in Giza, B) Tower in Babel, C) Sphinx in Alezandria, D) Well in Alexandria

Does a source moving affects light?

One way to force air into an unconscious person's lungs is to squeeze on a balloon appropriately connected to the subject. What force must you exert on the balloon with your hands to create a gauge pressure of 4.

The binding energy per nucleon is greatest for which of the following nuclei? (A) He (B) He (C) Fe (D) 232U (E) 232U

Energy transformation occurs as energy changes from one form to another. as these transformation occurs, which of the following happens?

How was hubble important to our understanding of galaxies?

A gate in an irrigation canal is constructed in the form of a trapezoid 2 m wide at the bottom, 38 m wide at the top, and 2 m high. It is placed vertically in the canal so that the water just covers the gate.

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine

Why do you float in space

How does physical change affect the identity of a substance

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment