Category: Physics

What are 3 characteristics of a good diet? Balance calories with physical activity to manage weight. Consume more of certain foods and nutrients such as fruits, vegetables, whole grains, fat-free and low-fat dairy products, and seafood. Consume fewer foods with sodium (salt), saturated fats, trans fats, cholesterol, added sugars, and refined grains. What are three […]

How do you tell if a lens is concave or convex? A concave lens is thinner in the middle and thicker at the edges. A convex lens is thicker in the middle and thinner at the edges. Used in the camera, focus sunlight, overhead projector, projector microscope, simple telescope, magnifying glasses, etc. It is also […]

What wattage is 120V 60hz? 120v/60hz means 120 volts 60 hertz frequency as opposed to Europe where they use 240 volts and 50 hertz. 14 watts is 14 watts. If you used it for an hour it would be 14 watt hours or . 014 kWh which is what you see on your power bill. […]

Did Pony Express riders carry guns? In addition to the mailbag, the Pony Express riders carried two things: a Bible, and a gun. What name was used for the locking pockets on the mochila that held the mail? The mochila was a leather piece with slits that fit over a pony express saddle. It had […]

What was the biggest volcanic eruption in history? Tambora Can a pilot depressurize the cabin? The current policy requires that the cockpit door be locked so that the hijackers have no access to the flight controls. A new method has been discussed whereby the pilots depressurize the cabin so as to eliminate the hijacking threat […]

What are the three effects of scarcity? What are the effects of scarcity? The scarcity of resources may lead to widespread problems such as famine, drought and even war. These problems occur when essential goods become scarce due to several factors, including the exploitation of natural resources or poor planning by government economists. What is […]

What are the conditions necessary for precipitation? A necessary condition to the formation of precipitation is that the air becomes saturated with water vapor. Saturation is the first step in the formation of precipitation (i.e. it is necessary but not sufficient). That is – you cannot add more water vapor to this parcel of air […]

How do greenhouse gases affect visible and infrared light? But the greenhouse gas molecules absorb the infrared light, and then re-radiate some of it back to the Earth’s surface. This makes the surface hotter so it radiates more light, thus establishing an equilibrium at a higher temperature. This process is known as the Greenhouse Effect. […]

How big are waves in the middle of the ocean? ELI5: How big do waves in the middle of the ocean actually get? 5m height (so 10m peak to valley) is quite common, but since there are many different sized waves traveling at different speeds, sometimes they come together and you get a brief but […]

When you kick a soccer ball you are changing? When we kick the ball, the force we apply to it causes it to accelerate from a speed of 0 to a speed of dozens of kilometers per hour. When the ball is released from the foot, it begins to decelerate (negative acceleration) due to the […]