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Hello everyone,
I have couple of online homework questions and I am not asking anyone to help me do the work. I will post the question and my answers to them and I would just like someone to verify if the answer is indeed correct because I only have one chance to submit my homework.
Again I am just verifying my answers, any comments would be helpful.
Determine the x and y components of the following vectors in the xy plane.
(a) A 14 m displacement vector that makes an angle of 38° clockwise from the +y direction.
x: 11.0m from 14*cos(38)
y: 8.6m from 14*sin(38)
(b) A 22 m/s velocity vector that makes an angle of 36° counterclockwise from the -x direction.
x: -17.8m/s from 22*cos(36) and negative because is in the negative quadrant
y: -12.9m/s from 22*sin(36) and negative because is in the negative quadrant
(c) A 35 lb. force vector that makes an angle of 171° counterclockwise from the -y direction.
x: 34.6lb.from 35*cos(171) and positive because is in the is 171 degrees
y: 5.5lb. from 35*cos(171) andpositive because is in the is 171 degrees
In doing a calculation, you end up with m/s in the numerator and m/s2 in the denominator. What are your final units?
1/s since m/m cancel and s/s2 = s
At t = 0, object A is dropped from the roof of a building. At the same instant, object B is dropped from a window 10 m below the roof. During their descent to the ground what happens to the distance between the two objects?
It is proportional to t?
A runner runs 2.0 km in a straight line in 9 min and then takes 25 min to walk back to the starting point. (The running and walking is in a straight line.)
(a) What is the runner's average velocity for the first 9 min?
2.0/9 km/h since the displacement is 2.0 and total time was 9 mins?
An object with an initial velocity of 7.0 m/s has a constant acceleration of 2.0 m/s2. When its speed is 17.0 m/s, how far has it traveled?
since is constant acc. each second it will travel 2.0m/s2
time 0 = 7.0 m/s
time 1 = 9.0 m/s
time 2 = 11.0 m/s
time 3 = 13.0 m/s
time 4 = 15.0 m/s
time 5 = 17.0 m/s
you add it up is 72 meters?
Thanks for your help and time.
I have couple of online homework questions and I am not asking anyone to help me do the work. I will post the question and my answers to them and I would just like someone to verify if the answer is indeed correct because I only have one chance to submit my homework.
Again I am just verifying my answers, any comments would be helpful.
Determine the x and y components of the following vectors in the xy plane.
(a) A 14 m displacement vector that makes an angle of 38° clockwise from the +y direction.
x: 11.0m from 14*cos(38)
y: 8.6m from 14*sin(38)
(b) A 22 m/s velocity vector that makes an angle of 36° counterclockwise from the -x direction.
x: -17.8m/s from 22*cos(36) and negative because is in the negative quadrant
y: -12.9m/s from 22*sin(36) and negative because is in the negative quadrant
(c) A 35 lb. force vector that makes an angle of 171° counterclockwise from the -y direction.
x: 34.6lb.from 35*cos(171) and positive because is in the is 171 degrees
y: 5.5lb. from 35*cos(171) andpositive because is in the is 171 degrees
In doing a calculation, you end up with m/s in the numerator and m/s2 in the denominator. What are your final units?
1/s since m/m cancel and s/s2 = s
At t = 0, object A is dropped from the roof of a building. At the same instant, object B is dropped from a window 10 m below the roof. During their descent to the ground what happens to the distance between the two objects?
It is proportional to t?
A runner runs 2.0 km in a straight line in 9 min and then takes 25 min to walk back to the starting point. (The running and walking is in a straight line.)
(a) What is the runner's average velocity for the first 9 min?
2.0/9 km/h since the displacement is 2.0 and total time was 9 mins?
An object with an initial velocity of 7.0 m/s has a constant acceleration of 2.0 m/s2. When its speed is 17.0 m/s, how far has it traveled?
since is constant acc. each second it will travel 2.0m/s2
time 0 = 7.0 m/s
time 1 = 9.0 m/s
time 2 = 11.0 m/s
time 3 = 13.0 m/s
time 4 = 15.0 m/s
time 5 = 17.0 m/s
you add it up is 72 meters?
Thanks for your help and time.