Answer:
6.25 g/cm³
Explanation:
2 cm * 2 cm * 3 cm = 12 cm³ (volume)
75 g / 12 cm³ = 6.25 g/cm³
Answer:Kg•m/s
Explanation:the SI unit for momentum is kg•m/s
Momentum=mass x velocity
Unit for mass=kg
Unit for velocity=m/s
Therefore they unit for momentum is kg•m/s
Answer:
B) more current.
Explanation:
When two lamps are connected in series then we have
![R = R_1 + R_2](https://tex.z-dn.net/?f=R%20%3D%20R_1%20%2B%20R_2)
now let the two lamps are identical
so we have
![R_1 = R_2 = R](https://tex.z-dn.net/?f=R_1%20%3D%20R_2%20%3D%20R)
now the total resistance of the lamps is given as
![R_{eq} = R + R](https://tex.z-dn.net/?f=R_%7Beq%7D%20%3D%20R%20%2B%20R)
now the current in that case is given as
![i = \frac{V}{R_{eq}}](https://tex.z-dn.net/?f=i%20%3D%20%5Cfrac%7BV%7D%7BR_%7Beq%7D%7D)
![i = \frac{V}{2R}](https://tex.z-dn.net/?f=i%20%3D%20%5Cfrac%7BV%7D%7B2R%7D)
Now when lamps are connected in parallel
net resistance of two lamps is given as
![\frac{1}{R_eq} = \frac{1}{R} + \frac{1}{R}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7BR_eq%7D%20%3D%20%5Cfrac%7B1%7D%7BR%7D%20%2B%20%5Cfrac%7B1%7D%7BR%7D)
so now we have
![\frac{1}{R_{eq}} = \frac{2}{R}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7BR_%7Beq%7D%7D%20%3D%20%5Cfrac%7B2%7D%7BR%7D)
so we have
![R_{eq} = \frac{R}{2}](https://tex.z-dn.net/?f=R_%7Beq%7D%20%3D%20%5Cfrac%7BR%7D%7B2%7D)
so now the current through the battery will be
![i = \frac{V}{R/2} = \frac{2V}{R}](https://tex.z-dn.net/?f=i%20%3D%20%5Cfrac%7BV%7D%7BR%2F2%7D%20%3D%20%5Cfrac%7B2V%7D%7BR%7D)
So current will be more when two lamps are connected in parallel
Answer:
C or D
cant say this will help much
Answer:
He did not do it very well.