Final answer:
The phrase 'profound sense of the weight of responsibility that will fall on his shoulders' affects the tone of the speech by highlighting the critical obligation Ford will have in serving as the President, which conveys a concerned tone.
Step-by-step explanation:
The phrase 'profound sense of the weight of responsibility that will fall on his shoulders' affects the tone of the speech by highlighting the critical obligation Ford will have in serving as the President, which conveys a concerned tone. This phrase suggests that Ford will have a heavy burden to carry and implies that there are high expectations for his performance. It conveys a sense of seriousness and the gravity of the situation, creating a concerned tone.