NEED HELP FAST.. identify which items listed below are scarce

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class