the beam has two dimensions: a height that is perpendicular to the floor of the train and a width that is parallel to the floor of the train. the angle between the beam and the floor appears different as measured by observers on the moving train and on the platform for which of the following reasons? check all that apply. the beam has two dimensions: a height that is perpendicular to the floor of the train and a width that is parallel to the floor of the train. the angle between the beam and the floor appears different as measured by observers on the moving train and on the platform for which of the following reasons?check all that apply. the crossbeam is moving relative to the observer on the train so the width appears contracted. the crossbeam is moving relative to the observer on the train so the height appears contracted. the crossbeam is moving relative to the observer on the platform so the height appears contracted. the crossbeam is moving relative to the observer on the platform so the width appears contracted.