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jacobhawkins112471
25.10.2021 •
Physics
Một xe tải khối lượng m1 = 10 tấn kéo theo nó một xe rơ-moóc khối lượng m2 = 5tấn. Hệ xe tải và rơ-moóc chuyển động thẳng nhanh dần đều trên đoạn đường phẳng ngang. Sau khoảng thời gian t = 100s kể từ lúc khởi hành, vận tốc của hệ xe tải và rơ-moóc đạt trị số v = 72 km/h. Hệ số ma sát giữa bánh xe và mặt đường là = 0,10. Lấy gia tốc trọng trường g = 9,80m/s2.
a. Tính lực kéo F của động cơ xe tải trong thời gian t = 100s nói trên.
b. Khi hệ xe tải và rơ-moóc đang chuyển động với vận tốc v = 72km/h thì xe tải tắt máy và hãm phanh. Khi đó, hệ này chuyển động chậm dần đều và dịch chuyển thêm một đoạn s = 50m trước khi dừng hẳn. Tính lực hãm Fh của phanh xe và lực F’ do xe rơ- moóc tác dụng lên xe tải
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Ответ:
No,
Explanation:
An electromagnetic wave is made of vibrating electric and magnetic fields that continually induce each other; matter is not needed for this to occur.