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A nut cracker is an example of:
A shovel is an example of:
The load of a lever is:
A boy pushes his desk across the floor for 8 meters and exerts a horizontal force of 25 newtons for 5 seconds. What was his power?
Amy uses 20N of force to push a lawnmower 10 meters. How much work does she do?
A book weighing 2 newtons is raised 1.5 meters. How much work was done?
How much work is done using a 800-watt microwave oven for 90 seconds?
A man expends 80 joules of work to move a box up an inclined plane. If the amount of work he produced is 60 joules, what is the efficiency of the machine?
A pulley system operates with \(30\%\) efficiency. If the work put in is 200 joules, how much useful work is produced?
A ship carries cargo in box units that weigh over 2,000 tons each. These units can be described as:
A man turns his water system on and notices the hose starts to move. This is a result of:
Which of the following is not a simple machine?
A woman uses an 8-foot long wheelchair ramp that reduces the force she needs to move any object by 1/4. Since the mechanical advantage of a ramp is equal to the length of the ramp divided by the height of the ramp, how high does the ramp go?
Tim kicked a soccer ball and exerted 200 newtons of force. If he kicked the ball 10 meters, how much work did Tim do?
Four gears are connected in a series. If the first gear turns counterclockwise, the fourth gear will turn:
Two gears are connected as part of a series. If the first gear has 12 teeth and the second gear has 6 teeth, what is the rotation ratio of the first gear to the second gear?
The gears on a bike reflect a 7:1 turn ratio between the front wheel and back wheel. If someone pedals 140 revolutions per minute (rpm), how fast will the rear wheel rotate?
A lever with an effort arm of 16 inches and a load arm of 4 inches would have a mechanical advantage of:
A lever with an effort arm of 6 feet and a load arm of 3 feet would have a mechanical advantage of:
If a movable pulley system provides a mechanical advantage of 2, a person could move a load that requires 90 newtons of force to move with a force of:
A compound pulley is set up with a mechanical advantage of 5. A mover could use it to reduce the amount of effort needed to move a load of 120 newtons with a force of:
Mechanics can be described as:
A mover uses a 10-foot long ramp that reduces the force he needs to move any object in half. Since the mechanical advantage of a ramp is equal to the length of the ramp divided by the height of the ramp, how high is the bed of the mover’s truck?
Two gears are connected as part of a series. If the first gear has 7 teeth and the second gear has 42 teeth, what is the rotation ratio of the first gear to the second gear?
What is the power of an electronic that can perform 4,800 joules of work in 12 seconds?