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 . . .

You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

Atruck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 13 km to his destination. what is the drivers total displacement?