Lò co có k= 50 N/m ,vật khối lượng m= 200g dao động điều hòa đoạn thẳng dài l = 12cm ,lấy g=10m/s² , ||²(pi) = 10 Tính biên độ A , tàn số góc w của chuyển động viết phương trình chuyển động của vật vhon gốc thời gian t=0 là lúc vật qua vị trí cân bằng theo chiều dương và chiều âm.

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation