To develop muscle tone, a woman lifts a 2.00-kg weight held in her hand. she uses her biceps muscle to flex the lower arm through an angle of 60.0º. (a) what is the angular acceleration if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.250 kg⋅m^{2} 2 , and the net force she exerts is 750 n at an effective perpendicular lever arm of 2.00 cm? (b) how much work does she do?

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

Sound is a disturbance that travels through a medium as a

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom