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Both are right. o'clock == of the clock to show talking about time. "half past three" is used more in...

Light is a wave which shows all of the properties of waves. (It shows reflection, refraction, diffraction and interference.) 光是一種電磁波，故名光波。光波和聲波相似，能產生干涉、繞射現象。

A scale (磅秤 ) shows the force that acts on it. The gravitational pull from the earth acts...

VIRTUAL. 一般我地用既magnifying glass 都係convex lens, 利用convex lens 既 object distance < focal length 既properties 來製造 放大而且又不反轉既image, 但這image 卻是virtual.

The diagram on the right shows the various parameters, a,v and x, in a simple...acceleration vector ao lies on the +ve x-axis. This shows that the acceleration is in opposite direction to the displacement...

Considering a volume element in spherical coordinate dV = r² sinφ dr dφ dθ , then the infinitesimal mass is dm = M / (4πR³/3) dV = [3M/(4πR³)] r² sinφ dr dφ dθ The distance of the infinitesimal mass to the rotation axis is r...

Susan is standing 2m away from a plane mirror as shown . Find the speed of the image if Susan+------------2m--------------+|mirror...

...move it. If the force he exerted on the cargo is 800N, show the direction of the frictional force on the cargo and give its value. The...