What pressing problem did the invention of the cotton gin solve?

A. removing seeds from cotton fiber

B. efficiently harvesting raw cotton

C. quickly plowing the cotton fields

D. irrigating the fields of cotton plants

the answer is A.

Which of the following is a form of potential energy? O A. Sound energy O B. Light energy O C. Nuclear energy O D. Electrical energy

A ray of light is incident on an unknown transparent substance from of incidence is 40°, and the angle of refraction is 22° (a) Explain why these measurements indicate that a change in speed must be happening as the light changes medium.

A lithium atom has three electrons. a fluorine atom has nine protons and nine electrons, with seven electrons in its outer energy level.

How do you Convert kilograms to newtons?

Which statements best describe characteristics unique to renewable resources? Check all that apply. Renewable resources are abundant. Renewable resources form slowly. Renewable resources can be used to generate electricity.

A book with a. mass of 1 kg is sliding to the left of a table. If the frictional force on the book is 5 N, calculate the book's acceleration. Is it speeding up or slowing down?

Blocks with masses of 3.0 kg, 4.0 kg, and 5.0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 16 N force applied to the 3.0 kg block. How much force does the 4.0 kg block exert on the 5.0 kg block?

Objects falling through air experience a type of friction called a. terminal velocity. b. air resistance. c. inertia. d. rolling frictio

Between which pair of objects would the largest gravitational attraction be found

Which of these items are made of cells? Check all that apply