How kind of cells have cell wall

Which system of measurement has been standardized worldwide for scientific uses? A. the English system B. The French system C. The Arabic system D. The Systeme international

How can sound interact with matter

When a book is resting on a level table and you are not pushing on it, is there a frictional force between the book and table?

Bob is pushing a box across the floor at a constant speed of 1.5 m/s, applying a horizontal force whose magnitude is 50 N. Alice is pushing an identical box across the floor at a constant speed of 3 m/s, applying a horizontal force.

Give an example of how the apparent motion of an object depends on the observer's motion.

What would result from under-coverage? A. a lack of accurate result B. an incorrect independent variable C. an experiment D. accurate result

What can be said about the force of gravity acting on an object that is floating stationary underwater and not moving up or down? A. The buoyant force equals the force of gravity, so there is no net force. B.

A frog in a hemispherical pod finds that he just floatswithout sinking in a fluid of density 1.25 g/cm3. If the pod has a radius of3.00 cm and negligible mass, what isthe mass of the frog?

What is the reasonable estimate for Lim g (x)

Do tides depend more on the strength of gravitational pull or on the difference in strengths? explain.