Mengapakah air mengambil masa yang lebih lama untuk mendidih apabila ia diapanaskan di paras laut berbanding dengan di puncak gunung walaupun pemanas yang mempunyai spesifikasi yang sama digunakan?

What is hidden during a lunar eclipse? isn't the moon hidden?

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?

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10