Answer:
The building is 61.19 m tall, approximately.
Explanation:
From the parabollic movement trayectory equation,
where H is the initial height of the ball and 
and 
the inital velocities in the vertical and horizontal direction, respectively; we have
.
In this case, the ball landed at the coordinates 
, so
.
Answer:
0.144 kg of water
Explanation:
From Raoult's law,
Mole fraction of solvent = vapor pressure of solution ÷ vapor pressure of solvent = 423 mmHg ÷ 528.8 mmHg = 0.8
Let the moles of solvent (water) be y
Moles of solute (C3H8O3) = 2 mole
Total moles of solution = moles of solvent + moles of solute = (y + 2) mol
Mole fraction of solvent = moles of solvent/total moles of solution
0.8 = y/(y + 2)
y = 0.8(y + 2)
y = 0.8y + 1.6
y - 0.8y = 1.6
0.2y = 1.6
y = 1.6/0.2 = 8
Moles of solvent (water) = 8 mol
Mass of water = moles of water × MW = 8 mol × 18 g/mol = 144 g = 144/1000 = 0.144 kg
Answer:
A continuous flow of negative charges (electrons) creates an electric current. The pathway taken by a electric current is a circuit.
Explanation:
Answer:
Correct option is
B
3
20
cm
Given; Focal length, f=20cm
Object distance, u=−10cm
Using mirror formula.
v
1
+
u
1
=
f
1
v
1
=
f
1
−
u
1
=
20
1
−
−10
1
(∵u=−10)
=
20
1
+
10
1
=
20
3
⇒v=
3
20
cm
After using a thermometer, it is best to wash it so that the next person who is going to use it won't get the flu or illness that the person who used it before. In washing it, it is best to wash it, rinse it thoroughly, sanitized it with the use of alcohol to remove excess germs and bacteria that could be still stuck on it and lastly, air dry. When dried, placed it on its proper case to avoid it from breaking or being contaminated.
