Paola, Isaiah and Ajay were wondering if the location that they hold a baseball bat will affect the distance a ball travels when it is hit. To answer their question they each conducted their

own investigation. Below is a summary of their procedures.

1. Each friend used his or her own bat and ball

2. Each friend hit his or her ball 20 times

. 10 times while holding the bat in the middle

• 10 times while holding the bat at the bottom

3. Each friend recorded the distance traveled by the ball after each hit.

After completing the investigation, they compared their results and concluded that holding the

bat in the middle would result in the furthest distance traveled. What should they do to improve

their investigation?

A. One friend should use another friend's baseball and baseball bat to increase replication in

the investigation.

B. Each friend should use a third grip on the baseball bat to increase the data for

  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

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27

elctricity and magnet is conversion to it

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000