What does it mean when an object does not slip? It means the object moves uniformly in one direction along the surface, with no angular velocity about the object’s own center of mass. What does it mean when a ball rolls without slipping? Rolling without slipping is a combination of translation and rotation where the […]
What are the effects of quenching?
What are the effects of quenching? Even cooling such alloys slowly in air has most of the desired effects of quenching; high-speed steel weakens much less from heat cycling due to high-speed cutting. Extremely rapid cooling can prevent the formation of all crystal structure, resulting in amorphous metal or “metallic glass”. What is the difference […]
What are the 8 types of joints?
What are the 8 types of joints? Planar, hinge, pivot, condyloid, saddle, and ball-and-socket are all types of synovial joints. Is the wrist a gliding joint? Gliding joints occur between the surfaces of two flat bones that are held together by ligaments. Some of the bones in your wrists and ankles move by gliding against […]
Can WD 40 spontaneously combust?
Can WD 40 spontaneously combust? If the oil will cure and harden, then it is a fire hazard. WD40 won’t spontaneously combust. At what temperature does gasoline vapor ignite? 536°F. Is it safe to pressurize gasoline? 100 PSI isn’t exactly a small amount of pressure and in itself is rather dangerous. If the container bursts […]
What are the 4 types of equilibrium?
What are the 4 types of equilibrium? There are three types of equilibrium: stable, unstable, and neutral. Figures throughout this module illustrate various examples. Figure 1 presents a balanced system, such as the toy doll on the man’s hand, which has its center of gravity (cg) directly over the pivot, so that the torque of […]
Which fruit or seed is dispersed by animals?
Which fruit or seed is dispersed by animals? Examples include mangoes, guavas, breadfruit, carob, and several fig species. In South Africa, a desert melon (Cucumis humifructus) participates in a symbiotic relationship with aardvarks—the animals eat the fruit for its water content and bury their own dung, which contains the seeds, near their burrows. What seeds […]
What causes altocumulus?
What causes altocumulus? Altocumulus clouds usually form by convection in an unstable layer aloft, which may result from the gradual lifting of air in advance of a cold front. The presence of altocumulus clouds on a warm and humid summer morning is commonly followed by thunderstorms later in the day. What is the characteristic of […]
Which condition causes storms to occur freezing of water droplets?
Which condition causes storms to occur freezing of water droplets? Cold Air Damming and Extended Lows Freezing rain develops when warm oceanic air rises up and over the cold air, producing liquid precipitation that falls through the cold layer. The falling droplets become supercooled and freeze on impact with the cold surface. Where is the […]
What are the examples of concave lens?
What are the examples of concave lens? There are many examples of concave lenses in real-life applications. Binoculars and telescopes. Eye Glasses to correct nearsightedness. Cameras. Flashlights. Lasers (CD, DVD players for example). What is the property of convex lens? The convex lens is a lens that converges rays of light that convey parallel to […]
Why did the Hindenburg not use helium?
Why did the Hindenburg not use helium? U.S. law prevented the Hindenburg from using helium instead of hydrogen, which is flammable. After the crash of the hydrogen-filled R101, in which most of the crew died in the subsequent fire rather than the impact itself, Hindenburg designer Hugo Eckener sought to use helium, a non-flammable lifting […]