A car has a mass of 900 kg It accelerates from rest at a rate of 1.2 m/s2
a Calculate the time taken to reach a velocity of
30 m/s
b Calculate the force required to accelerate the car
at a rate of 1.2 m/s
[3]
c Even with the engine working at full power, the
car's acceleration decreases as the car goes faster
Why is this?
[3]
5 The diagram below shows some of the forces acting
on a car of mass 800 kg
)
direction of motion
nuing force
2000 N
total drag force
a State the size of the total drag force when the car
is travelling at constant speed.
b The driving force is increased to 3200 N.
í Find the resultant force on the car at this
instant
ü Write down, in words, the equation
connecting mass, force and acceleration,
iii Calculate the initial acceleration of the car. [2]
c Explain why the car will eventually reach a new
higher constant speed.
[2]
6
3N
4N
a Using a scale drawing (for example, on graph
paper), find the resultant of the forces above. [5
b Draw diagrams to show how, by changing the
direction of one of the forces, it is possible to
produce a resultant of i 7N, 1N

where is the circuit diagram ?

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

more than, less

less than, more