The focal length is the distance from the middle of the lens to the what?

A glass pipe system has a very corrosive liquid flowing in it (think hydrofluoric acid, say). The liquid will destroy flow meters, but you need to know the flow rate.

Which of the following quantities is a vector in character? electric energy electric potential difference electric charge electric field

An EM wave has frequency 9.90*10^14 Hz. What is its wavelength? How would we classify it?

Consider the following statement: ""The magnetic field of a magnet comes out of the north pole and goes into the south pole"" Based on what you know the divergence and curl of the magnetic and auxiliary fields why is this statement imprecise?

How do we use a dam to generate electricity? A) The pressure of the water against the dam spins a turbine. B) When waves lap against the wall of the dam, a wheel is spun. C) Water flowing through an intake pipe causes a turbine to spin.

What's the symbol for an ionized bromine atom?

What is the hottest layer in the Sun's atmosphere?

Which do you need to calculate the speed of a wave? A. distance and frequency B. distance and time C. time and frequency

What is one of the benefits that scientists have discovered from organisms' daily exposure to radioisotopes? 1. being able to Carbon date fossils 2. X-ray Imaging capability 3. radiation treatment for cancer 4. invention of microwave cooking

Despite valid research, in the late 1900s, women and minorities were thought to have a higher level of intelligence than white males