Category: Physics

Is a timpani a Membranophone? Timpani are a somewhat strangely shaped membranophone. Instead of cylinder-shaped, they look like half a dome. Timpani are often used in orchestral music and they have a fantastic deep but pitched sound (unlike a kick drum for example). Is Monday a good day to cold call? The Best Days for […]

How do you find the internal resistance of a lithium ion battery? The load current for a small battery is 1A or less; for a starter battery it might be 50A or more. A voltmeter measures the open circuit voltage (OCV) with no load, followed by the second reading with a load; Ohm’s law calculates […]

Which of the following is a disadvantage of using hydrogen fuel cells? There are disadvantages to using hydrogen-oxygen fuel cells in cars. These include: hydrogen is in the gas state at room temperature and pressure, so it is difficult to store in the car. fuel cells and electric motors are less durable than petrol engines […]

What factors reduce the efficiency of a heat engine from its ideal value? Specific types of engines have lower limits on their efficiency due to the inherent irreversibility of the engine cycle they use. The non ideal behavior of real engines, such as mechanical friction and losses in the combustion process causes further efficiency losses. […]

Where should compost be in sun or shade? Should my compost pile be in the sun or in the shade? You can put your compost pile in the sun or in the shade, but putting it in the sun will hasten the composting process. Sun helps increase the temperature, so the bacteria and fungi work […]

What are the principles of reconnaissance? ORIENT ON THE RECONNAISSANCE OBJECTIVE. GAIN AND MAINTAIN ENEMY CONTACT. ENSURE CONTINUOUS RECONNAISSANCE. MAINTAIN FREEDOM OF MANEUVER. REPORT INFORMATION RAPIDLY AND ACCURATELY. DO NOT KEEP RECONNAISSANCE ASSETS IN RESERVE. DEVELOP THE SITUATION RAPIDLY. What is the function of reconnaissance? Reconnaissance is a mission to obtain information by visual observation […]

What waves can pass through the ionosphere? One of the layers in the Earth’s atmosphere is called the ionosphere. Radio waves can be reflected from the ionosphere. Water is also able to reflect radio waves, but land masses are not such good reflectors. How does Kennelly Heaviside Layer affect radio communication? It reflects medium-frequency radio […]

Why is it easier to go down a slope of a hill than going up? The change in speed on slopes is due to gravity. When going downhill, objects will accelerate (go faster), and when going uphill they will decelerate (slow down). Does the height of a ramp affect the distance? 1. Increasing the height […]

What are three assumptions of the kinetic theory? The simplest kinetic model is based on the assumptions that: (1) the gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size; (2) the molecules undergo perfectly elastic collisions (no energy loss) with […]

What happens when you mix sulfuric acid and barium hydroxide? When Barium Hydroxide is added to Sulfuric Acid, insoluble Barium Sulfate and water are produced. The solution initially contains H+ and SO42- ions. The addition of Ba2+ and OH- ions produces an insoluble compound and water; effectively removing all the ions from the solution. Why […]