Một ô tô A chạy đều trên 1 đường thẳng với vận tốc 40km/h. Một ô tô B chạy ngược chiều với vận tốc 60km/h. Tính vận tốc ô tôt B so với ô tô A

Which is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?

Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?