It’s makes a explosion
Efficiency is the proportion of energy usefully used. Using a pulley system does not use less energy it just changes the ammount of force. Pulleys do have a small ammount of friction so having just one pulley would be more efficient. (but not much more)
none of them are the least helpful they all help things move upward except the lever but the most helpful one is the pulley a pulley takes up less space and it goes straight up so u can use less force
Depending on the purpous of the plane, the 787 is more efficient yes, but it can carry less passengers, and less cargo, then the 747.
A rocket plane is more efficient in the absence of air because it doesn't have to overcome air resistance, known as drag. This allows it to travel faster using less fuel and achieve higher altitudes without the need for continual propulsion to counteract drag forces.
A pulley can reduce the amount of force needed to move an object by distributing the force over multiple ropes and pulleys, effectively trading force for distance. An inclined plane can reduce the force needed to move an object by allowing it to be raised to a higher elevation with less force over a longer distance.
Some of the input force is lost due to friction. If you are using a pulley system then there is friction between the rope and the pulley and there is also friction within the ball bearings of the pulley itself. If you are using an inclined plane there is friction between the plane and the object traveling upon it. In a friction-less world the input is equal to the output.
The mechanical advantage of an inclined plane is less than that of a lever because the inclined plane allows for the exertion of a smaller force over a longer distance to move objects up an incline. In contrast, the lever utilizes the principle of leverage to magnify an applied force, making it more efficient in lifting heavy objects.
because lifes hard
Wedge, Lever, Wheelare the three simple machinesa pulleyclass 1, 2, and three levers like a can opener or a sea saw, and even a wheel barrow.That's easywheel barrow=inclined planeslide=screwwagon=wheel and axleknife=wedgeand there is one more.....a pulley......but I don't know what would be used as that.srry-abby-:) :] (: [:
Friction is useful when you are trying to stop a car, but not useful in the pistons of a car's engine (It makes them less efficient).
A pulley helps us by providing a mechanical advantage, making it easier to lift heavy objects by distributing the force required over multiple ropes or cables. By using a pulley system, we can lift, lower, or move heavy loads with less effort than if we were to do so manually. This makes tasks like hoisting items or lifting weights more manageable and efficient.
In terms of energy efficiency, a lever is typically more efficient than an inclined plane because it allows for the same work to be done with less force. Levers utilize the principle of torque, which enables them to magnify the force applied to them. However, the efficiency can depend on the specific task and design of the mechanism.