In the periodic table of elements, what do all the elements 2 in a row have in common

You are driving at a reasonable constant velocity in a van with a windshield tilted 120 o relative to the horizontal. As you pass under a utility worker fixing a power line, the worker's wallet falls onto the windshield.

Is oil less dense than water

A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It travels a distance d before coming to rest. If its initial velocity were doubled, the distance required to stop would A) double as well.

How many joules of energy does a 100-watt light bulb use per hour?

How can electricty be used to create a magnetic field

What is the fundamental unit for measuring mass in the metric system?

Why are some craters on the moon bigger than others

What object oriented feature can we use to have a single test program, with one set of method calls in which the user can decide which bag implementation (array - or link-based) needs testing?

What might motivate someone to study forensics

A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to five times her weight as she goes through the dip. If r = 17.