if you hold your arm outstretched with palm upward, the force to keep your arm from falling comes from your deltoid muscle. assume that the arm has mass 4.0 kg and the distances and angles shown in (figure 1).

Luminous objects such as flashlights emit light that we can see. how do we see an object that isn’t luminous? a. the object emits light that reaches our eyes. b. light reflects off the object and reaches our eyes. c. light passes through the object uninterrupted. d. light is fully absorbed by the object. e. we can’t see an object that isn’t luminous.

After studying french for 5 yearscin school, i was shocked to discover when i went to france that i couldn't even get a glass of water without a lot of sign language what is the author main point

"what factors influence the absorption of sunlight at earth's surface? "