Chemistry, 17.02.2021 07:40 olivernolasco23
1. Which example represents a class 2 lever?
•tweezers plucking hairs
•a car door being opened and shut
•salad tongs picking up salad
•a screwdriver opening a paint can
2. Which statement best describes energy?
Energy is the force that causes movement in an object.
Energy is a push or pull on an object that will change the motion of the object.
Energy is the power derived from the utilization of simple machines.
Energy is the ability to do work.
3. Which statement best describes work?Work is the force that causes movement in an object.
Work is a push or pull on an object that will change the motion of the object.
Work is the power applied to simple machines.
Work is the ability to exert energy.
4. A shovel performs several different functions. One of these is that it gives mechanical advantage as a lever. When does it act like a lever?
when the soil is lifted with the dirt at the end of the shovel and a lifting force at the handle
when the shovel is in the dirt and you push down against the end of the shovel, making it pivot
when you step up onto the shovel with both feet to use your body weight
when you push the shovel downward into the dirt and a small force allows you to push down into the dirt easily
5. A person uses a screwdriver as a lever to open a can of paint. Where is the fulcrum in this situation?
the point where the person holds onto the can to keep it in place
the point where the end of the screwdriver lifts up the lid of the can
the point where the person pushes down on the screwdriver
the point where the screwdriver touches the rim of the can
Answers: 2
Chemistry, 22.06.2019 04:50, aletadaboss
Acompound contains c, h, and o atoms. when 1.130 g of the compound is burned in oxygen, 1.064 g co2 and 0.3631 g h2o are produced. what is the empirical formula of this compound?
Answers: 1
Chemistry, 23.06.2019 03:00, mullerma
Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative
Answers: 3
1. Which example represents a class 2 lever?
•tweezers plucking hairs
•a car door being...
•a car door being...
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