Ablock attached to a spring with unknown spring constant oscilates with a period of 4.2 s. parts a to d are independent questions, each referring to the initial situation. parta what is the period if the mass is doubled? express your answer to two significant figures and include the appropriate units. 7-1 value units subrnit part b what is the period ส the mass is halved? express your answer to two significant figures and include the appropriate units. ㆁ四 tvalue units submit part c what is the period if the amplitude is doublad? express your answer to two significant figures and include the approprlate unlts. t- 1 value units submit part d what is the period if the spring constant is doubled? express your answer to two significant figures and include the appropriate units. 7-1 value submit