Lucy needs to lift a crate to a shelf 20 m high. she does 12000 j of work on a machine to her. the machine exerts force of 500 n to lift the crate. what is the efficiency of the machine? a) 4.2% b) 24% c) 58% d) 83%

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper.

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.