Agreat natural and humanitarian disaster occurred when the volcano mt pelee erupted on the island of martinique in 1902. an effect of the eruption was a phenomenon called a "nuee ardente" in which a large cloud of hot gas is emitted and rolls down the mountainside, in this case enveloping the town of saint pierre and killing 30,000 people. since the ambient temperature was around 20 c, it's clear that the high-temperature cloud must have been composed of a high-molecular mass gas in order for it to sink rather than rise. suppose the temperature in the cloud was 600 c. estimate the minimum value, in atomic mass units (amu), of the average molecular mass of the gas in the cloud. (assume the ambient air is primarily nitrogen, 28 amu.) amu

iron would move it is magnetic there is a mag field around the current in the wire

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas