How much work is needed to lift a 3-kg mass a distance of 0.75 m? How much work is done against gravity in lifting a 6.5-kg weight through a distance of 21 cm? How much mechanical work is done in raising a 39.2 kg mass a distance of 1.1 meters?
If the ball could move on any other plane, it would impart less energy to the other balls in the impact or miss them altogether, and the device wouldn't work as well, if at all. All the balls are, ideally, exactly the same size, weight, mass and density. Different-sized balls ...
How to calculate water of hydration? The human body contains what percentage of water? What is the mass density of water? What is the weight density of water? What is the mass in kilograms of one liter of water? What is its weight in newtons?
How are weight and gravitational force related? Is force measured in newtons? How to calculate force from momentum? Forces of 3.0 N and 1.0 N act on a 6.0 kg mass as shown below. What is the acceleration of the 6.0 kg mass? What is the difference between magnitude of a force a...
That, in short, is how planes work—but how do jet engines work?Photo: A jet engine taken apart during testing. You can clearly see the giant fan at the front. This spins around to suck air into the engine as the plane flies through the sky. Picture by Ian Schoeneberg courtesy of ...
This kind of spring dynamometer is almost identical to a spring balance. The only difference is in calibration: a spring balance has its scale marked in units of weight (such as kg), while a spring dynamometer is calibrated in units of force (such as newtons). While a spring dynamometer ...
If you’re browsing on our website, you can filter life jackets by your weight. If you're unable to fit the jacket securely, exchanges are very easy.See our return policy for more details. If you’re in our store, try the life jacket on. How does it feel? Is it comfortable? And...
Gas turbine engines have a great power-to-weight ratio compared to reciprocating engines. That is, the amount of power you get out of the engine compared to the weight of the engine itself is very good. Gas turbine engines are smaller than their reciprocating counterparts of the same power....
The engine throws the mass of gas out in one direction in order to get a reaction in the opposite direction. The mass comes from the weight of the fuel that the rocket engine burns. The burning process accelerates the mass of fuel so that it comes out of the rocket nozzle at high ...
If only working out and losing weight were easy. Sadly, that's just not the case; if you want to burn calories and shed those pounds, you're going to have to put some work in. But, no one wants to put in more work than necessary — that's why science has invested countless hours...