A scientist with mass m is sitting on one end of a lifeboat of uniform density with mass 3m. When he spots a rescue chopper in the distance, he walks a distance of L to the other side of the lifeboat to wave for help. Which of the following statements best characterizes the motion of the lifeboat? A. The lifeboat shifts by the same distance traversed, but in the opposite direction of his motion.
B. The lifeboat does not shift forward or backward as a result of the scientist's motion.
C. The lifeboat shifts by L/4 in the opposite direction of the scientist's motion.
D. The lifeboat shifts in the same direction as the scientist's motion with constant velocity.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

positive reinforcement? ?

wavelength divides in half and speed stays the same.

answer///terminator or twilight zone;