Nhiệt lượng tỏa ra của 2kg chì từ 120℃ đến 70℃ là bao nhiêu? Biết nhiệt dung riêng của chì là 130J/kg. K.

You throw a baseball directly upward at time t = 0 at an initial speed of 12.3 m/s. what is the maximum height the ball reaches above where it leaves your hand? at what times does the ball pass through half the maximum height? ignore air resistance and take g = 9.80 m/s2.

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

What is the stall speed at sea level of an airplane that weights 10000 lbs., has a wing area of 300ft^2, and a maximum lift coefficient of 1.4? what is the stall speed if flaps that double cl,max are applied?