Category: Physics

What happens if a runner misses a base on a home run? A runner who misses the plate after overrunning or oversliding it may return to touch it (NFHS 8-2 Nt.; NCAA 8-6a4; pro 5.09b12). If the runner immediately makes an effort to touch the plate, he is out only when he is tagged. When […]

What if the magnification is less than 1? A magnification of 1 (plus or minus) means that the image is the same size as the object. If m has a magnitude greater than 1 the image is larger than the object, and an m with a magnitude less than 1 means the image is smaller […]

How many miles per gallon does a freight train get? 492 miles How much it costs to run a train? By way of comparison, an electric train which consumes 30 kWh per train-mile at 12¢ per kWh would have a fuel cost of only $3.60 per train-mile and many trains average less. With the proviso […]

What makes a reaction dangerous? Even slow reactions can be hazardous if they involve large amounts of material or if the heat and gases are confined, such as in a sealed storage drum. Drums that are swollen and distorted from over-pressurization are potentially very dangerous. They may rupture at any time without warning and release […]

What is the relationship between temperature and height in the thermosphere? The Thermosphere and Ionosphere The thermosphere lies above the mesopause, and is a region in which temperatures again increase with height. This temperature increase is caused by the absorption of energetic ultraviolet and X-Ray radiation from the sun. Is the thermosphere the hottest layer? […]

What is C in a ray diagram? The important point on the object to draw rays from is the top, as the image of the bottom of the object now must lie on the principal axis. There are two important points marked on the diagram. C represents the centre of curvature of the mirror, and […]

Can a substance be cooled to a temperature below its freezing point? Liquids have a characteristic temperature at which they turn into solids, known as their freezing point. In theory, the melting point of a solid should be the same as the freezing point of the liquid. It is possible, however, to cool some liquids […]

How do you calculate cfm of air flow? To calculate Air Flow in Cubic Feet per Minute (CFM), determine the Flow Velocity in feet per minute, then multiply this figure by the Duct Cross Sectional Area. What are the different methods used for measuring air flow? The most common and easiest way to measure or […]

Why do atoms get bigger across a period? 4 Answers. As you move from left to right across a period, the number of protons in the nucleus increases. These lower energy levels shield the valence electrons from the attractive effects of the atom’s nucleus, so the atomic radius gets larger. Why do atoms get smaller […]

How fast can a freight train accelerate? The final factor and one frequently overlooked is the tractive effort required for acceleration of the train. It takes about 10 pounds per ton to accelerate to a speed of 6 miles per hour in one minute or 12 miles per hour in two minutes, a reasonable rate […]