Seorang astronot memiliki saudara kembar dan pergi ke ruang angkasa pada umur 40 tahun. Astronot tersebut kembali ke bumi dan saudara kembarnya kini berusia 50 tahun. Menurut astronot, umur saudara kembarnya seharusnya 48 tahun. Berdasarkan cerita tersebut, maka kecepatan pesawat luar angkasa yang digunakan astronot untuk pergi sebesar . . .

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

Ahowler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 4.6 km. assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 w/m2. what is the acoustic power emitted by the howler

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves