Answer:
a. 601
b.
Step-by-step explanation:
a. The number of students in the school who study french:
The number of boys who study french + The number of girls who study french:
= (3÷7)×644+(5÷8)×520
= 601
b. the probability that a student does NOT study French :
= P(boy does not study french) + P(girl does not study french)
It is y=-3.5+9.5
i dont know how to put it into fraction form sorry
Answer:
Step-by-step explanation:
GIVEN: Steve and Carol live miles apart. They start at the same time and travel toward each other. Steve's speed is greater than Carol's. If they meet in , find their speeds.
TO FIND: find their speeds.
SOLUTION:
Distance between Steve and Carol
Let the speed of Carol be
As Steve's speed is greater than Carol's.
Speed of Steve
As both are approaching towards each other
relative speed of Steve and Carol
Total time taken by both to meet each other
Total time taken by both to meet each other
speed of Carol
Speed of Steve
Hence the speed of Carol and Steve are and respectively
a. The velocity t =
b. v60 = 7164
<h3>How to solve for the velocity</h3>
mdv/dt = ck - mg
dv/dt = ck/m - mg/m
= ck/m - g
dv =
Integrate the two sides of the equation to get
v
b. fuel accounts for 55% of the mass
So final mass after fuel is burned out is = 0.45
c=2500
g=9.8
t=60
v = -2500ln0.45 - 9.8 x 60
= 7752 - 588
= 7164
<h3>Complete question</h3>
A rocket, fired from rest at time t = 0, has an initial mass of m0 (including its fuel). Assuming that the fuel is consumed at a constant rate k, the mass m of the rocket, while fuel is being burned, will be given by m0 - kt. It can be shown that if air resistance is neglected and the fuel gases are expelled at a constant speed c relative to the rocket, then the velocity of the rocket will satisfy the equation where g is the acceleration due to gravity.
dv dt m =ck - mg
(a) Find v(t) keeping in mind that the mass m is a function of t.
v(t) =
m/sec
(b) Suppose that the fuel accounts for 55% of the initial mass of the rocket and that all of the fuel is consumed at 60 s. Find the velocity of the rocket in meters per second at the instant the fuel is exhausted. [Note: Take g = 9.8 m/s² and c = 2500 m/s.]
v(60) =
m/sec [Round to nearest whole number]
Raed more on velocity here
brainly.com/question/25749514
#SPJ1