Answer:
Step-by-step explanation:
<u>Electric Field</u>
The electric field produced by a point charge Q at a distance d is given by
Where
The net electric field is the vector addition of the individual electric fields produced by each charge. The direction is given by the rule: If the charge is positive, the electric field points outward, if negative, it points inward.
Let's calculate the electric fields of each charge at the given point. The first charge 
is at the origin. We'll calculate its electric field at the point x=-3.85 cm. The distance between the charge and the point is d=3.85 cm = 0.0385 m, and the electric field points to the left:
Similarly, for 
, the distance to the point is 12 cm + 3.85 cm = 15.85 cm = 0.1585 m. The electric field points to the right:
Since E1 and E2 are opposite, the net field is the subtraction of both
Answer:
Step-by-step explanation:
really
12x+-4y=34x
Answer:
central angle=18
arc length=2.5 π feet
area of a sector=31.25π square feet
Step-by-step explanation:
Given
wheel radius=25 feet
attached cars=20
Space between cars along the circumference of wheel= 360/20
=18
Finding arc length:
arc length= radius x angle(in radians)
angle in radian = 18 x π/180 = 0.1π radians
arc length = 25 x 0.1π
=2.5π feet
Area of the circle = πr^2
Area of the circle = π(25)^2
Area of the circle = 625π square feet.
As the ratio of the central angle to the full circle angle is proportional to the area of the sector to the complete circle:
central angle/360=area of sector/area of circle
Area of sector= area of circle x 18/360
= 625π(1/20)
=31.25π !
4 difference, subtract 20 point - 1st point, =19, 19 places x difference of 4= 76 more or less than 36. More would be 112, less would be -40.
A and C are both 40 while choice B = the difference so I'd say it's supposed to be 1 of the 40's but it's missing the negative sign
Answer:
61.68 mg
Step-by-step explanation:
Given the table :
5:00pm - 400mg
6:00pm - 350mg
7:00pm - 306.25mg
First we obtain the percentage rate at which the drug leaves her system per hour :
Take between 5-6 pm
((400 - 350) / 400) * 100%
(50 / 400) * 100%
0.125 * 100%
= 12.5%
.we can use the exponential function :
A = P(1 - r)^t
r = rate, t = time (hours) ; P= initial amount ; A = final amount
Mg of medicine left when she wakes up at 7:00 am
t = 7:00am - 5:00 pm = 14 hours
P = 400 mg
r = 0.125
A = 400(1 - 0.125)^14
A = 400 * 0.1542100
A = 61.68402913
About 61.68 mg
