một chất điểm thực hiên giao động điều hòa với chu kỳ T=0,628s. vào một lúc nào đó chất điểm đi qua li độ X=6cm thì sau đó 1,57s chất điểm có li độ là

b.transmitters send radio waves, and receivers capture radio waves.

-4 on

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.