Cho bán kính vecto chất điểm r = 2ti - 3t^2j , i và j là x và y . Xác định vecto vận tốc và độ lớn V = 1S

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

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

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?