A man inputs a force of 10 newtons on a machine that moves an object that weighs 30 newtons. The mechanical advantage is ...
What is 3
100
If 80 joules of work are inputed to a machine and only 60 joules of work are done by the machine. What is the efficiency of the machine?
What is 75%?
100
A pie on a window sill cooling down by the breezes of air is an illustration of which type of heat transfer.
What is convection?
100
How much heat needs to be added to 10 grams of water to raise its temperature by 10 degrees?
What is 418.7 joules?
200
A ramp is an example of ____________
What is inclined plane?
200
A large rock weighing 160 newtons is placed on one end of a lever. A man comes and presses down with a force of 40 newtons in order to move the rock. What is the mechanical advantage of the lever?
What is 4
200
A man inputs 500 joules of work into a machine and only gets 300 joules of work out. What is the efficiency?
What is 60%?
200
A mother blowing on the hot food of her child to cool it down is an example of which mode of heat transfer?
What is convection?
200
How many grams of water need to absorb 1000 joules of energy in order to raise 20 degrees?
What is 12 grams?
300
This is an inclined plane wrapped around a cylinder.
What is screw?
300
A woman pushes a crate up a 5 meter long ramp to reach a height of 2 meters. What is the mechanical advantage of the ramp?
What is 2.5
300
Can work output ever be greater than work input? Why or why not?
No, because you cannot create more work than what is put in.(Law of conservation of energy)
300
When you place your hand on a stove heat is transferred by which method?
What is conduction?
300
The units for specific heat are ...
What is J/g*C
400
A machine made of two inclined planes that is used to split objects.
What is wedge?
400
A machine has a mechanical advantage of 6. If a box weighs 120 newtons how much force will need to be applied to the machine to move the box?
What is 20 newtons?
400
If a machine has an efficiency of 50% what is the work output if the input was 60 joules?
What is 30 joules?
400
To reflect heat away from our bodies should we wear a shiny white shirt, dull white, shiny black, or dull black?
What is shiny white?
400
If 800 grams of water absorb 20000 joules of energy how much did the temperature raise?
What is 6 degrees celsius
500
A wheelbarrow is a compound machine made up of these two simple machines.
What is lever and wheel and axle?
500
A man slides a crate up ramp with a mechanical advantage of 3. If he reaches a height of 2 meters how long was the ramp?
What is 6 meters?
500
If 100 joules of work are done by a machine with 65% efficiency how much work was put in?
What is 154 joules?
500
What kind of colors reflect heat and what kind of colors absorb it?
What is shiny light colors are good for reflecting heat and, dull dark colors absorb it?
500
What is the definition of specific heat?
What is the amount of energy needed to raise 1 gram of a substance by 1 degree Celsius?