Which statement best compares potential and kinetic energy? a. objects always have more potential energy than kinetic energy. b. only kinetic energy increases when the velocity of an object increases. c. only potential energy decreases when an object’s height increases. d. objects always have more kinetic energy than potential energy.

B. Only kinetic energy increases when the velocity of an object increases.  

Explanation:

As we know that kinetic energy is given by the formula

so kinetic energy directly depends upon the speed of the object

Also we know that gravitational potential energy depends on the height of the object

so it is given as

so here on increasing height the gravitational potential energy will increase

so here correct answer must be

B. Only kinetic energy increases when the velocity of an object increases.  

  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

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6