Dua bola A dan B memiliki massa yang sama. Kedua bola hendak dijatuhkan pada saat yang sama dari sebuah apartemen. Bola A dilepas dari ketinggian h meter dan bola B dilepas dari 4h meter. Jika bola A tiba lebih dulu di dasar apartemen dengan kecepatan v m/s maka tentukan besarnya energi kinetik yang dimiliki bola b saat sampai dasar. ​

Alarge truck is moving 22.0 m/s. if it’s momentum is 125,000 kg • m/s, what is the trucks mass

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?