Which force best represents Fg? A weight lifter is pushing a barbell upward with a force of 90 N.
The weight of a barbell acting on a weight lifter is 80 N.
The amount of upward force of a table on a box is 25 N.
A box on a rough table has difficulty sliding past 25 N of force.
SOMEONE PLS HELP ME ITS ON MY TEST AND IT HAS A TIME LIMET

1. list three scientific reasons cockroaches may fly.

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)