37 - Why do we oil door hinges?

Two iron spheres contain excess charge, one positive and the other negative 1. Describe how the charges are arranged on these spheres if they are very far from each other.

In 1999, what percentage of 36-month-old toddlers had been toilet trained? 20 percent 40 percent 60 percent 80 percent

Q30. When working near some large air cored inductors you misplace a socket and as you cannot find it you proceed to energise the system. However, you find that something does not operate as expected.

In which form of business do the members of an organization own and control its activities? The members of a (n) organization own and control its aclivities.

Doctors once believed that illness was caused by foul air and could not be transmitted from one person to another.

A roller coaster has a mass of 500 kg. It drops from rest at the top of a hill that's 57 m tall. How fast is it going when it reaches the bottom? Acceleration due to gravity is g = 9.8 m/s2.

Two sinusoidal waves are moving through a medium in the positive x-direction, both having amplitudes of 7.00 cm, a wave number of k=3.00m-1, an angular frequency of ω=2.50s-1, and a period of 6.00 s, but one has a phase shift of an angle ϕ=π12rad.

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?