This is one of my homework problems for a College Physics I course:
Dana has a sports medal suspended by a long ribbon from her rearview mirror. As she accelerates onto the highway, she notices that the medal is hanging at an angle of 12° from the vertical.
What is her acceleration (m/s2)? Express your answer using two significant figures.
What I don't understand is how I'm supposed to calculate anything given only that one angle, 12 degrees. Can someone help guide me to where to get started? Thanks.