Một vật được ném xiên với vận tốc ban đầu 2√2 (m/s) hợp với phương ngang góc 45o.
a) Sau bao lâu (kể từ lúc ban đầu) thì vật đạt độ cao cực đại?
b) Tính độ cao cực đại của vật (so với vị trí ban đầu của vật).

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

The power exerted by a muscle is the product of the force exerted and the velocity of contraction. the area of which of these shaded regions represents the power exerted while a weight is lifted at maximum speed?

How many astronauts have walked on the moon?