Category: Physics

Is all green glass uranium? Perhaps the most reliable way to identify the presence of uranium in the glass is to expose it in the dark to a source of ultraviolet light (e.g., a black light). If the glass glows a rich green color, it contains uranium. Why is depression glass called depression? Depression glass […]

What can be added to steel to make it stronger? carbon Can you mix finishes in a house? DON’T mix too many finishes and styles in the same room. If the finishes are different then the styles should be mostly the same (or at least similar). The exception here is if you want to call […]

Does lift increase with speed? Drag versus speed. method of increasing lift is by increasing velocity if the AOA is held constant just short of the “critical,” or stalling, AOA (assuming no flaps or other high lift devices). Lift and drag also vary directly with the density of the air. Does lift increase with Reynolds […]

Why does the brother leave doodle in the rain? When Brother leaves Doodle in the rain, it is clear that he is angry that Doodle has failed. Doodle already collapsed in the mud after getting out of the boat, and both boys realize Doodle is not going to run. So Brother’s dream of a “regular” […]

Why did the Allies postponed opening a second front until 1944? 29. The Allies postponed opening a second front in Europe until 1944 because A. They hoped that Germany and the Soviet Union would cripple each other. The Soviet Union requested a delay until it could join the campaign. How did the opening of a […]

How far can the average human throw? Depends, are you asking how high or how far a ball can be thrown? Assuming the first of the two the average human can throw a ball approximately 15 metres (49.213 feet) in the air. In the latter the average person could throw a ball around 60 mp/h […]

Which signal analog or digital is a more reliable way to transmit information? Because of these things, digitized signals (sent as wave pulses) are a more reliable way to encode and transmit information than analog signals. Digital signals are patterns generated by sampling a stream of continuous data at regular intervals. What is a disadvantage […]

What do Isometries preserve? An isometry is a transformation that preserves the relative distance between points. Under an isometry, the image of a point is its final position. What are the four types of Isometries? There are four types: translations, rotations, reflections, and glide reflections (see below under classification of Euclidean plane isometries). The set […]

Which of the following is an example of body-centered cube? Examples of metals with the bcc structure are alpha iron, tungsten, chromium, and beta titanium. What are the three types of cubic unit cells? As one example, the cubic crystal system is composed of three different types of unit cells: (1) simple cubic , (2) […]

Why is Jupiters spot red? Hypotheses supported by laboratory experiments suppose that the color may be caused by chemical products created from the solar ultraviolet irradiation of ammonium hydrosulfide and the organic compound acetylene, which produces a reddish material—likely complex organic compounds called tholins. How long will the Great Red Spot last? He said the […]