A 75-kg person on skis is going down a hill sloped at 30.0 degrees above horizontal. The coefficient of kinetic friction between the skis and snow is 0.15. How fast is the skier going 10.0 s after starting from rest? Please show work A) 78m/s
B) 36m/s
C) 78m/s^2
D) 36m/s^2

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Blank is the perceived frequency of a sound wave

Car batteries are often rated in amp-hours. this rating indicates the quantity of charge that can pass through the battery before the battery's chemical energy must be restored by the car's generator or some other source. the amp-hour unit is convenient for simple calculations. for example, a 60-amp-hour battery can supply a current of 1.0 a for 60 h (or 60 a for 1.0 h) before going dead. find the energy stored in the following. (a) a 58 a-h, 10 v car battery(b) a 1.3 a-h, 1.7 v flashlight battery