Aperson rides a bicycle down the street. the position of a reflector attached to a point on the rim of one wheel is r- (0.5m) (cos(8.8t) - 8.8t)i + sin(8.8t)j where i is the unit vector pointing in the x-direction (horizontal) and j is the unit vector pointing in the y-direction (vertical), and t is measured in seconds. the position of the reflector in the formula is measured with respect to a stationary point on the ground the center of the wheel a stationary point at the same height above the ground as the center of the wheel hint: remember that the sine of an angle has a value between -1 and 1. can the reflector ever sink below the ground? what is the velocity of the reflector at the instant when it touches the ground? zero 4.4j

Ok i am attempting to my niece attach a galvanized wire (like a tether for a dog) at the corner of two fences, making a tightwire if you will and we drilled a hole in a softball and she hits it. the ? and problem is that we can not get the wire taunt enough where it doesnt sag after hitting the ball once, and the wire sags and wobbbles. its a 15 ft rubber covered galvanized wire and one can adjust the length of the placing of the wire by having it make the corner of 2 fences become a it can be adjusted, however, with all our human strength and pliers we could not make it taunt as possible. is there anything other that attaching it to a car to do this. sorry abt the length but it would mean the world to my niece if i could solve this came up with the entire idea herself, and she is 14 and paid for the wire and did as much work as i did drilling a hole through a softball wide enough for attaching piece at each end of the wire that clips on to the fence. . any ideas welcome if serious. but awesome if it is a fact. much obliged. bucky bukowski buckman

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

The items in the following list are all units of matter. which is the smallest unit that retains the properties of the matter? a.) atom b.) compound c.) electron d.) element