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If you mean an erection of the penis, this due to the fact that blood engorges the penis, means it goes into the penis but prevented from leaving. This causes a temporary erection. This is one reason that men with Heart disease or high blood pressure have difficulty getting or maintaining an erection. When the man loses the erection, whether through masturbation, sexual intercourse, or cold shower, the blood slowly leaves the penis. An erection that lasts longer than 4 hours or becomes painful is a medical emergency.

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What is a hard source?

A hard source is a primary source that provides direct evidence or firsthand information about a topic. This could include documents, data, or original research findings that are considered reliable and credible for academic or journalistic purposes.


When a sound wave bounces off a hard surface it can have 2 names?

When a sound wave bounces off a hard surface, it can be called either an echo or a reflection. Both terms refer to the phenomenon where the sound waves are reflected back towards the source.


Is it possible to use tornadoes as a source of energy?

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Why can you hear a mans voice around the corner of a building even if you cant see him?

Sound waves can bend around obstacles such as corners and travel through the air. This allows the sound of a man's voice to reach your ears even if he is not in your line of sight. Sound waves reflect and diffract, enabling you to hear the sound even when the source is not visible.


What happens when a sound wave reflects off a hard surface?

When a sound wave reflects off a hard surface, it bounces back towards the source. The angle of incidence (incoming angle) is equal to the angle of reflection (outgoing angle). This can create echoes and influence the overall sound in the environment.