Rupert (66 kg) is now in a full-pipe of radius 25 m, calculate the minimum speed at which rupert can skate to ensure he will not a fall off the skateboard at the top of the pipe? **show work**

at the top most point if Rupert will not fall then normal force at the top point is almost zero for minimum speed

so here we can say

now if

so above will be the minimum speed

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.