Answer: “A machine can decrease either the input force or the input distance needed to do a given amount of work” is the best statement that describes why a machine is useful.

Simple machines are useful because they reduce effort or extend the ability of people to perform tasks beyond their normal capabilities. Simple machines that are widely used include the wheel and axle, pulley, inclined plane, screw, wedge and lever.

Answer choices: The mechanical advantage makes the work output greater than the work input. The machine can put out force without having any force applied to it. A large force can be exerted through a long distance to have a small force exerted through a short distance.

A ramp like the one in the Figure below is another example of an inclined plane. Inclined planes make it easier to move objects to a higher elevation. The sloping surface of the inclined plane supports part of the weight of the object as it moves up the slope. As a result, it takes less force to move the object uphill.

What is impossible for a machine to do? It can apply a force to an object in a different direction than the force applied to the machine. It can increase the distance through which a force acts by exerting less force than was used on it.

Answer: it is D because a machine is used to help with something so when you put force on a machine then that machine has a greater force to help you do something it will never have a a force less than the one applied.

It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine, shown in Figure 1 by the term.

Explanation: By the principle of conservation of energy, energy can never be created or destroyed. To do more work by a machine than the amount of work done on the machine is impossible because to do so machine will have to create energy within itself which violates the principle of conservation of energy.

The right answer for the question that is being asked and shown above is that: “If the input force is greater than the output force, then the input distance must be greater than the output distance.” Tika most likely describe this relationship between force and distance to her study group is that If the input force is …

By definition, the mechanical advantage of a machine is equivalent to the ratio of its output force to its input force. Since it applies a force of 1000 N to an object, that is its output.

The correct answer is D. Explanation: In order to do that, You need this formula: Mechanical Advantage = Output Force/Input Force. So, The order is “Lian, Aida, Dipak, Brian” also known as D.

In addition to reducing friction, a wheel and axle can also serve as a force multiplier, according to Science Quest from Wiley. If a wheel is attached to an axle, and a force is used to turn the wheel, the rotational force, or torque, on the axle is much greater than the force applied to the rim of the wheel.

Because all machines lose input work to friction, one way to improve the efficiency of a machine is by reducing friction. Oil is used to reduce friction between the moving parts of car engines. The use of oil makes engines more efficient. Bicycles lose energy to friction and to air resistance.

Machine Efficiency Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work). The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent.

Explanation: No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). That is why 100% efficiency in machines shall not be possible.

In order to achieve 100% efficiency (η=1), Q2 must be equal to 0 which means that all the heat form the source is converted to work. The temperature of sink means a negative temperature on the absolute scale at which the temperature is greater than unity.

Fuel efficiency The new Wärtsilä 31 is the most fuel-efficient four-stroke engine currently available on the market. The diesel version of the engine consumes on average 8–10g/kWh less fuel compared with the closest competitor across its entire load range.

The work efficiency formula is efficiency = output / input, and you can multiply the result by 100 to get work efficiency as a percentage.

efficiency = (10 + 20)% = 30%. This means in one day A and B together can do 30% of the work. Therefore, Number of days A and B together take to do 100% of work = (100/3) days = 3.33 days.

Efficiency is defined as the ability to produce something with a minimum amount of effort. An example of efficiency is a reduction in the number of workers needed to make a car. noun.

An efficiency apartment is a small apartment unit that, true to its name, combines the functionality of multiple rooms into one. An efficiency apartment typically combines the bedroom, living room and kitchen all into one single room. Efficiency apartments are often considered the same as studio or bachelor apartments.

Efficiency in the workplace means when employees carry out the correct tasks in the right way, with the least waste of time and effort. In essence, improving workplace efficiency is about helping employees work smarter, not harder.

Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without waste.

Fuel efficiency is a form of thermal efficiency, meaning the ratio of effort to result of a process that converts chemical potential energy contained in a carrier (fuel) into kinetic energy or work.