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).

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Which accurately compares concave and convex lenses?

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?