Category: Physics

Which device is used to indicate the direction of current? The current flows through the ammeter. Note that an ammeter has a very low resistance. How can a DMM be used to determine the direction of flow? When using a multimeter to measure current, the only way that can be used to detect the level […]

What causes Oxbow? An oxbow lake forms when a river creates a meander, due to the river’s eroding bank . After a long period of time, the meander becomes very curved, and eventually the neck of the meander becomes narrower and the river cuts through the neck by sedimentation of silt, cutting off the meander […]

Is Van de Graaff generator a capacitor? A leyden jar is a storage capacitor which can withstand very large voltages. A van de graaf generator is a charge pump which can generate large voltages, but at very small currents. When you connect a van de graaf to a leyden jar, the jar accumulates the energy […]

What happens if the Senate and House pass different versions of a bill? If the House and Senate pass the same bill then it is sent to the President. If the House and Senate pass different bills they are sent to Conference Committee. Most major legislation goes to a Conference Committee. Why do the House […]

What is inside of a ping pong ball? Celluloid is a thermoplastic made from nitrocellulose and camphor. Sometimes dyes and stabilizers are added. A typical ping pong ball might consist of 70% to 80% nitrocellulose, with up to 30% camphor. Small amounts of dye, ethanol, and stabilizers make the ball colorful, more stable, and less […]

What is a good attack angle? While there are exceptions, this is my basic formula for players in college or pro ball: If the hitter’s peak exit velocity is under 105 mph, their attack angle should be between 5 and 15 degrees. If their peak exit velocity is above 105 mph, it should be between […]

What are the advantages of observation in research? The biggest advantage of observational research has already been noted: it enables businesses to observe potential customers in a natural setting, which can reveal penetrating insights unavailable through other methods such as focus groups and surveys. What are the advantages and disadvantages of a survey? Advantages of […]

What is the minimum ceiling for VFR flight? IFR means a ceiling less than 1,000 feet AGL and/or visibility less than three miles. Low IFR (LIFR) is a sub-category of IFR. VFR means a ceiling greater than 3,000 feet AGL and visibility greater than five miles. What is the minimum VFR? Basic VFR Weather Minimums […]

What 3 things does a pedometer measure? Pedometers come in all shapes and sizes. Simple devices simply measure steps, while others also include features such as time, alarm, distance, calories, etc. Are phone pedometers accurate? Accurate pedometers are useful tools to motivate and estimate physical activity. There are today free pedometer applications available for download […]

What is the minimum velocity needed to transport a cobble? At 10 cm per second [?] is eroded whilst would be deposited. Cobbles are upwards of 170cm per second. Deposition starts to occur at cm per second for particles of approximately 0.01mm in size. Boulders require the smallest velocity for deposition, at only cm per […]