Elena makes the table below to determine the number of atoms of each element in the chemical formula 3(nh), so
total atoms
element
nitrogen
hydrogen
sulfur
oxygen
calculation
1 x 2 x 3
4x2x3
1 x 4 x3
- 4x3
24
12
12
vhat mistake did elena make?
she should not have multiplied the sulfur atoms by the subscript 4
she should not have multiplied the nitrogen atoms by the subscript 2
she should not have multiplied the oxygen atoms by the coefficient 3
she should not have multiplied the hydrogen atoms by the coefficient 3.

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.