1. During the Middle Ages, armies often attacked castles using large siege engines such as the counterweight trebuchet at left. What challenges might you face if you attacked a castle?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.