The best kind of bridge ... using popsicle sticks? What bridge holds the most weight ... how do youmake a popsicle stick that won't break?

Charles Darwin's groundbreaking book, The Origin of Species, described the process of a) acquired traits. b) natural selection. c) the laws of gravity. d) the movement of the solar system.

A carousel revolves around 9.4 times in 8.5 minutes. What is the frequency of the carousel in hertz?

Why do scientists believe that light is made of waves?

In which wavelength region (s) would we need to carry out observations in order to study the accretion disk around a white dwarf in a binary system?

If Jim could drive a Jetson's flying car at a constant speed of 280 km/hr across oceans and space, approximately how long (in millions of years, in 106 years) would he take to drive to a nearby star that is 8.1 light-years away? Use 9.

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is:

Emission of light from an atom occurs when an electron