anonymous
  • anonymous
Final exam review help?!?!
Physics
schrodinger
  • schrodinger
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anonymous
  • anonymous
I have 3 study sheets.
anonymous
  • anonymous
anonymous
  • anonymous
for # 1 i got 34km/h

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anonymous
  • anonymous
no, you have to multiply by 3.6
anonymous
  • anonymous
why?
anonymous
  • anonymous
|dw:1383926098747:dw|
anonymous
  • anonymous
4.9 m change it to km it is 0.0049km/s * 60 *60 = 33.8
anonymous
  • anonymous
4.9 m change it to km it is 0.0049km this is correct. but then when you change seconds into hours you divide by 3600 since you divide it in the denominator it is like multiplying by 3600 so eventually 0.0049 * 3600 = 17.64 km/h
anonymous
  • anonymous
look at my draw
anonymous
  • anonymous
-> 0.0049km/s * 60 *60 = 33.8 it is 17.64 and not 33.8
anonymous
  • anonymous
0.0049 * 60 * 60 = 17.64
anonymous
  • anonymous
maybe you did mistake when you enter the numbers into the calculator
anonymous
  • anonymous
the options are 94,000 km/h 34 km/h 2.6 km/h 34,000,000 km/h
anonymous
  • anonymous
well what can i say : http://www.unitconversion.org/velocity/meters-per-second-to-kilometers-per-hour-conversion.html you may check yourself here
anonymous
  • anonymous
0.0049 * 60 * 60 = 17.64 do it in the calculator and see
anonymous
  • anonymous
m is for meters right ? :O
anonymous
  • anonymous
yes. Idk maybe the options are wrong. i keep getting 17.64 too.
anonymous
  • anonymous
i guess they are wrong
anonymous
  • anonymous
A physical quantity X depends on mass, distance, and time. Use dimensional analysis to decide which of these is a possible expression for X where a is acceleration, v is velocity, and F is force. It's either X=Ft or X=1/2at^2 right?
anonymous
  • anonymous
well in x=1/2at^2 there is no mass
anonymous
  • anonymous
would X=Ft work?
anonymous
  • anonymous
you have options ?
anonymous
  • anonymous
yes X=Ft X=at X=vt and X=1/2at^2
anonymous
  • anonymous
yes Ft is the one
anonymous
  • anonymous
for 3 I want to say B?
anonymous
  • anonymous
no
anonymous
  • anonymous
(just to make sure that you understand Ft units are [kg m / s] so it has mass distance and time)
anonymous
  • anonymous
now for 3. think what happens to y when x is small and when x is big..
anonymous
  • anonymous
im confused
anonymous
  • anonymous
y = k/x for low values of x like when x goes to zero y will be very large for high values of x like when x goes to infinity y will be very low agree ?
anonymous
  • anonymous
yes so thus my answer is A? AS X gets larger Y gets smaller.
anonymous
  • anonymous
yes ! A
anonymous
  • anonymous
A balloon is expanded to the same volume as that of a human head. Do an order-of-magnitude estimate of the volume of this balloon in cm3
anonymous
  • anonymous
1,000 cm3?
anonymous
  • anonymous
i think it iscorrect
anonymous
  • anonymous
Which equation represents inverse proportionality? y=mx?
anonymous
  • anonymous
y=mx is linear proportionality direct ..
anonymous
  • anonymous
y=mx y=mx^2 +b for nonzero b y=m/x y=mx^2
anonymous
  • anonymous
we had one like this before .. we want inverse so when one is high the other is low and when one is low the other is high ...
anonymous
  • anonymous
so how would that be represented by an equation?
anonymous
  • anonymous
y=m/x as i said we had something like this before when we chose graph A
anonymous
  • anonymous
oh. okay so its like the graph.
anonymous
  • anonymous
A bicycle and rider travel along a road. Which of the following statements is true?
anonymous
  • anonymous
The bicycle wheels rotate and translate the entire bike and the rider.
anonymous
  • anonymous
please write the other options as well
anonymous
  • anonymous
Only the bicycle rider undergoes a translation. The bicycle wheels rotate and translate the entire bike and the rider. Only the bicycle undergoes a translation. Neither the bicycle nor the rider undergoes a translation.
anonymous
  • anonymous
so your answer is correct
anonymous
  • anonymous
Suppose you are on a conveyor belt walkway at an airport. The walkway is moving at 0.50 m/s. You walk backward at 0.80 m/s to hand your suitcase to a friend who is 3.0 m behind you. A security guard stands alongside the walkway watching this. What is your speed relative to the guard? im not sure how to do this one.
anonymous
  • anonymous
so if you were not moving the relative speed was 0.5m/s correct?
anonymous
  • anonymous
correct
anonymous
  • anonymous
now i guess the 0.8m/s walking backwards is relative to the belt! so we have: 0.5 - 0.8
anonymous
  • anonymous
do you understand why ?
anonymous
  • anonymous
because he is walking backwards at 0.8
anonymous
  • anonymous
yes. not moving on the belt : 0.5 moving forward on the belt at x : 0.5 + x moving backward on the belt at x: 0.5 -x
anonymous
  • anonymous
okay
anonymous
  • anonymous
An airplane travels southwest a distance of 650 km at a velocity of 430 km/h. How long does the trip take in hours? 1.5?
anonymous
  • anonymous
correct
anonymous
  • anonymous
(650/430 = 1.5116...)
anonymous
  • anonymous
On the position-time graph, what is the average velocity between 5 s and 10 s?
anonymous
  • anonymous
anonymous
  • anonymous
not sure about this one.
anonymous
  • anonymous
average velocity = (y2-y1) / (t2 -t1)
anonymous
  • anonymous
between two points : (t1,y1) and (t2,y2)
anonymous
  • anonymous
4m/s?
anonymous
  • anonymous
at 5 sec the height is 10 so (5,10) and at 10 sec the height is 30 so (10,30) (30-10) / (10-5) = 4 correct
anonymous
  • anonymous
A ball is dropped from a tower. It strikes the ground with a speed of +19.0 m/s. How high is the tower? 18.4m
anonymous
  • anonymous
you take the value of g as 9.8 ?
anonymous
  • anonymous
so yes correct..
anonymous
  • anonymous
v=gt so t=v/g now plug it into h = 0.5gt^2 = 0.5v^2/g = 18.4
anonymous
  • anonymous
A ship travels south at 15 km/h for 4 h. What is the ship's displacement in km? 60km South?
anonymous
  • anonymous
correct 15*4 = 60
anonymous
  • anonymous
A ball is rolling down a hill at +2.0 m/s. The ball is uniformly accelerating at +4.0 m/s2. What will the ball's velocity be 3.0 s later? 14m/s because v=u+at
anonymous
  • anonymous
What additional force must be applied so that the block does not accelerate? 10N West?
anonymous
  • anonymous
A 1,560 kg car is accelerating at 1.30 m/s2. What net force acts on the car? F=ma so 2028 rounds to 2030?
anonymous
  • anonymous
Which statement is equivalent to Newton's first law? No net force acting on an object means no acceleration.
anonymous
  • anonymous
A tension force of 2.50 N acts horizontally on a 2.00 kg block. The block accelerates at 0.750 m/s2. What is the force of kinetic friction? 1N?
anonymous
  • anonymous
however the options are - 3.33 N - 1.50 N - 1.00 N - 4.00 N
anonymous
  • anonymous
ball - correct block - correct car - correct newtons first law - seems like it is correct but it is better to see the other options tension - it is -1 (remember that the kinetic friction force is against the direction of the motion) so you right about the magnitude but the sign is there to show what is the direction.
anonymous
  • anonymous
i guess that you solved it like 2.5 - Fk = ma and then you got Fk =1 but look at the equation - you already chose the direction with the minus sign.
anonymous
  • anonymous
No net force acting on an object means no acceleration. For every action there is an equal and opposite reaction. Mass is directly proportional to weight. The acceleration of an object is the net force acting on it divided by its mass.
anonymous
  • anonymous
so it is right.
anonymous
  • anonymous
The acceleration due to gravity on the surface of Mars is gmars = 3.7 m/s2. How much would an 11 kg bag of potatoes weigh on Mars? 41N?
anonymous
  • anonymous
yes
anonymous
  • anonymous
3.7*11
anonymous
  • anonymous
The 48 kg student on skates pushes the 40 kg student on skates. The 40 kg student accelerates at 3.0 m/s2. What is the acceleration of the 48 kg student?
anonymous
  • anonymous
im not sure about this one
anonymous
  • anonymous
newton's third law..
anonymous
  • anonymous
another hint ?
anonymous
  • anonymous
F=ma?
anonymous
  • anonymous
newton's third says that if body A push body B with force F then body B push body A with the same force F in the opposite direction
anonymous
  • anonymous
i feel stupid. sorry. ive been up all night
anonymous
  • anonymous
what is the force that acts on the 40kg student ?
anonymous
  • anonymous
dont feel stupid your answers are good
anonymous
  • anonymous
3m/s?
anonymous
  • anonymous
i asked about the force The 40 kg student accelerates at 3.0 m/s2 so the force on him is 40 * 3 = 120 N now according to newton's third law it is the force that acts on the second student as well (in the other direction) so 120 = 48 * a a = 120 / 48
anonymous
  • anonymous
2.5 m/s
anonymous
  • anonymous
yes (well they might have there -2.5 since it is in the other direction)
anonymous
  • anonymous
A 0.156 kg ice puck collides with a 0.170 kg ice puck. Both were originally moving at the same speed. Which one has the larger change in velocity?
anonymous
  • anonymous
The 0.156 kg puck changes velocity the most. The 0.170 kg puck changes velocity the most. They both have the same change in velocity. They each have no change in velocity. I say it is the first one...
anonymous
  • anonymous
so the situation is that they are moving toward each other ? and then elastic collision ?
anonymous
  • anonymous
i asume
anonymous
  • anonymous
correct then
anonymous
  • anonymous
A diver jumps down on a springboard, bounces back up, and dives into the pool. Which of these is one of the action-reaction pairs involved?
anonymous
  • anonymous
the force on the board as the diver bends it downward and the force on the diver as the board springs back up the force of the board on the diver as he moves down and the force of the board on the diver when pushed back up the springiness of the board in moving back up the force the diver exerts on the water and the force the water exerts on the diver
anonymous
  • anonymous
so what do you think ?
anonymous
  • anonymous
A?
anonymous
  • anonymous
yes
anonymous
  • anonymous
newton's third law always involved two bodies
anonymous
  • anonymous
A force of 100 N acts in a direction at an angle of 30° with the x-axis. What is the magnitude of the x component of the force?
anonymous
  • anonymous
about 90N?
rajat97
  • rajat97
|dw:1383940674800:dw| yes the accurate answer is 86.5 newton
anonymous
  • anonymous
Two movers are pushing a large crate along the ground, one with a force of 30 N east and the other with a force of 40 N north. The crate does not move. What is the magnitude of the force of static friction?
rajat97
  • rajat97
always remember for ease of resolving the forces into perpendicular directions, the component of force near the angle is the force x cos theta and the one which is away from it is f x sin theta
rajat97
  • rajat97
|dw:1383940923978:dw| the forces are perpendicular so the resultant is \[\sqrt{F1^{2}+F2^{2}}\] therefore the resultant is 50N and the force of friction is equal to it
anonymous
  • anonymous
Which of these is true about an object thrown straight up in the absence of air resistance?
anonymous
  • anonymous
Its acceleration is constant. The direction of its velocity is constant. Its acceleration and velocity are both momentarily zero at maximum height. Its acceleration increases as it falls.
anonymous
  • anonymous
so what do you think ?
anonymous
  • anonymous
C?
anonymous
  • anonymous
well no does g change during the motion ?
anonymous
  • anonymous
i want to say no
anonymous
  • anonymous
because the acceleration does not change
anonymous
  • anonymous
so it would be A?
anonymous
  • anonymous
yes
anonymous
  • anonymous
note that at the maximum height the velocity is indeed zero. but what makes it go down ? the acceleration.
anonymous
  • anonymous
The velocity of an object increases from 5.0 m/s to 15 m/s in 2.0 s. What is the average acceleration of the object?
anonymous
  • anonymous
5m/sn2
anonymous
  • anonymous
ok
rajat97
  • rajat97
i'm on it average velocity is change in velocity in unit time so here it is 15-5/2 =5m/s^2
anonymous
  • anonymous
is it + or -?
rajat97
  • rajat97
change in velocity is final velocity -initial vel as final vel is greater than initial vel , it will be posotive
rajat97
  • rajat97
and if vel is increasing, then acceleration is +ve
anonymous
  • anonymous
What shape does a position vs. time graph have for an object in uniform acceleration?
anonymous
  • anonymous
cubic inverse quadratic linear
rajat97
  • rajat97
i think its cubic as the degree of the equation increases as we move towards position time graph i mean to say its linear in v-t graph so it may be quadratic in x-t graph
anonymous
  • anonymous
hi again
anonymous
  • anonymous
okay and hi
rajat97
  • rajat97
are your questions finished
anonymous
  • anonymous
ok.bye
rajat97
  • rajat97
please inform me when your questions are finished
rajat97
  • rajat97
somethings gotta go wrong with openstudy well i live in india and its 2:45 am and i think i shall sleep now but if you have any questions please post them i'm onine for 15 mins
anonymous
  • anonymous
no, my mom needed help with something.
anonymous
  • anonymous
A book is being pushed along a table at constant speed. The coefficient of static friction is 0.75, and the coefficient of kinetic friction is 0.30. The book has a mass of 0.50 kg. What is the force of friction?
anonymous
  • anonymous
1.5N
anonymous
  • anonymous
correct

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