1.A lever does 765 J of work and the person using the lever applies 900 J of work. What is the efficiency of the lever? 2.When your car gets a flat tire, you need to use a jack to lift the car. The car requires only 9000 J of work to lift it, but due to the inefficiency of the jack, you need to put in 15,000 J of work to lift the car. What is the efficiency of the jack?

3.An automobile gasoline engine can do 225 J of work with each stroke of its pistons. If the engine has an efficiency of 30%, what is the amount of work that must be done on the pistons in the engine?

There are two routes similar in terrain; however, one route has an incline of approximately 28 degrees, and you must decide on which route to take. what is the maximum road grade that your fully loaded ecv can climb?

What is friction? how does it affect the motion of an object?

The chart shows the costs and shipping times for materials that a company needs to build a new product. which describes the best trade-off if the company needs to start building their product within the next two years? they should order the domestic materials because it is always best to choose the fastest shipping time. they should order the imported materials because it is always best to choose the lowest cost for materials. since the shipping time is longer, they should order the domestic materials because the additional cost is worth it to get the materials in time. even though the shipping time is longer, they should order the imported materials because they are less expensive and should arrive in plenty of time to build the product.