A meter stick has a mass of 200 g. It is balanced on a fulcrum at the 50 cm mark and there is a 100 g mass at the 100 cm mark. Where do you place another 100 g mass and keep this system balanced (at what reading on the meter stick)?
A)At the 0 cm mark.
B)At the 25 cm mark.
C) At the 50 cm mark.
D)At the 100 cm mark.

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s