How many neutrons does element x have if it's atomic number is 31 and it's mass number is 88?

What is the shape of the trajectory that a charged particle follows in a uniform magnetic field?

Two identical balloons of the same volume are pumped up with air to more than atmospheric pressure and suspended on the ends of a stick that is horizontally balanced. One of the balloons is then punctured. Is the balance of the stick upset?

Natalia lifts a bag of groceries 0.50 m by exerting a force of 36 N. How much work did she do on the bag? 0 J 18 J 36 J 72 J

What is the speed of a falling object?

Two straight, parallel wires a and b carry currents in opposite directions, and are separated by a distance d. The magnitude of the force exerted by each wire on a segment of length L of the other wire is F. The vector sum of these forces is

When you look into a clear pond, a fish may appear to be in a different position than it actually is. What is this caused by? A. diffraction B. dispersion C. refraction D. reflection,

How long would it take to drive to alpha centauri (4.4 light-years away) ?

A type of fault where the hanging wall slides upward

How was dyslexia treated in the past and how is dyslexia treated today?

The work of Charles Kuen Kao is likely to have been most influenced by the work of which of the following scientists? A. Galileo Galilei B. Christian Doppler C. Sir Isaac Newton D. Ibn al-Haytham