Is weigh-in time for the local under-85-kg rugby team. the bathroom scale used to assess eligibility can be described by hooke’s law and is depressed 0.75 cm by its maximum load of 120 kg. (a) what is the spring’s effective spring constant? (b) a player stands on the scales and depresses it by 0.48 cm. is he eligible to play on this under-85 kg team?

An object of dimensions 50 cm x 40 cm x 0.20 cm has a mass 60g. find its density in g/cm3 and kg/ m3

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

If frequency goes down, what happens to wavelength? does it get shorter or longer?