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1. ### The Forces of Rolling

The question is: A wheel is rolling smoothly on horizontal surface. There is a constant horizontal force of magnitude 10 N. Wheel has mass of 10 kg, and radius of 0.3 m. The accel. of its centre of mass has mag. of 0.6 m/s^2. I am asked to find frictional force in unit-vector notation. This...
2. ### Solving Velocity & Acceleration of Two Jeeps Relative to Each Other

Car Question ! Two Jeeps P and B race along straight lines, across flat terrain, and past stationary border guard A. Relative to the guard, B travels at a constant speed of 20.0 m/s at the angle theta=30.0*. Relative to the guard, P has accelerated from rest at a constant rate of 0.400 m/s^2 at...
3. ### The acceleration of a particle on a horizontal xy plane

alright so i got: dx = 1.5t^2 + vcos0t + 20 dy = 2t^2 + vsin0t + 40 where the 0 is theta
4. ### The acceleration of a particle on a horizontal xy plane

so would i integrate a to find position and then velocity?
5. ### The acceleration of a particle on a horizontal xy plane

The acceleration of a particle on a horizontal xy plane is given by a=3ti + 4tj, where a is in meters per second-squared and t is in sec. At t=0, the particle has the position vector r=(20.0m)i + (40.0m)j and the velocity vector v=(5.00m/s)i +(2.00m/s)j. At t=4.00 s, what are its position...
6. ### Basic Physics Volcano Question

During volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. At what initial speed would a bomb have to be ejected, at angle 35* to the horizontal, from the vent at A in order to fall at the foot of the volcano at B, at vertical...
7. ### Basics Physics VECTOR Question

The acceleration of a particle on a horizontal xy plane is given by a=3ti + 4tj, where a is in meters per second-squared and t is in sec. At t=0, the particle has the position vector r=(20.0m)i + (40.0m)j and the velocity vector v=(5.00m/s)i +(2.00m/s)j. At t=4.00 s, what are its position...
8. ### Basic Physics Question

if i multiply both sides by 2 to get rid of the 1/2 i get 106 = -(9.8) t^2
9. ### Basic Physics Question

i plugged in all my values but get stuck at one point with a negative square root: 53 = -1/2(9.8)t^2
10. ### Basic Physics Question

well the max height is 53 m, and it reaches that height when v = 0.0 m/s
11. ### Basic Physics Question

so i can solve for t in the y=y0 + v0-1/2gt^2 equation and sub t into x=x0 +v0t equation and solve for x
12. ### Basic Physics Question

and b/c I am looking for how far its been displaced horizontally from the launch pt. i am looking for x?
13. ### Basic Physics Question

Now i have to calculate how far is its displacement horizontally from launch pt, at the instant it achieves max height. So i know that its v will be 0 m/s at max heigh.
14. ### Basic Physics Question

So the horizontal component of my initial velocity is 20 m/s, and the vertical component of initial velocity is 36.6 m/s
15. ### Basic Physics Question

Alright, so i got 36.3 m/s for v0
16. ### Basic Physics Question

:O I just figured something out... Don't know if I am on the right track but let me know: If i solve for v0 in equation x=x0 + v0t, then i can sub that into the other equation?
17. ### Basic Physics Question

alright so solving that equation would give me v0. Now what do i do with that? would i also need to solve for v0 in equation x=x0 + v0t?
18. ### Basic Physics Question

you said i left out the vertical displacement at time, so that would be y in the case of this equation y = y0 + v0y*t - 1/2*g*t^2 , and y is 53 m ?
19. ### Basic Physics Question

you said i left out the vertical displacement at time, so that would be y in the case of this equation y = y0 + v0y*t - 1/2*g*t^2 , and y is 53 m ?
20. ### Basic Physics Question

so all the - demonstrates is the negative direction?
21. ### Basic Physics Question

its on the ground?
22. ### Basic Physics Question

wait.. wouldn't gravity be -9.8 m/s^2 so that the answer would be 19.6 ? and i don't know what units it'd be
23. ### Basic Physics Question

so: - initial position (y0) would be 0 m - initial velocity (v0) would be 0 m/s - time would be 2.0 sec - force of gravity 9.8 m/s^2 so my answer would be -19.6 m/s??
24. ### Basic Physics Question

y = y0 + v0y*t - 1/2*g*t^2 ?
25. ### Basic Physics Question

now how do i find vertical component?
26. ### Basic Physics Question

alright, i know that v = d/t so i'd get v = 40m/2sec = 20 m/sec but do i use the horizontal distance or vertical distance ? and what does velocity give me? is that the horizontal component?
27. ### Basic Physics Question

or is that only when an object is thrown directly upwards and falls directly downwards.
28. ### Basic Physics Question

can i do this: y = 1/2 * g* t^2 y = 1/2 (9.8) (2)^2 y = 19.6
29. ### Basic Physics Question

how do i find the horizontal velocity component?
30. ### Basic Physics Question

so would saying the following make any sense: the horizontal velocity is constant so the projectile is moving 40m/s right the vertical velocity changes 9.80 m/s downward because of gravity
31. ### Basic Physics Question

2 seconds after being projected from ground level, a projectile is displaced 40 m horizontally and 53 m vertically above its launch point. What are the horizontal and vertical components of the initial velocity of the projectile? At the instant the projective ahieves maximum height above...
32. ### Vector Question any suggestions?

Alright so based on the website you provided and my notes i calculated the average speed to be 644 km/h and the average velocity to be 214.7 km/h in the south east direction. v = (483 + 966)/2.25 = 644 km/h vave = (966-483)/2.25 = 214.7 km/h south east What do you think??
33. ### Vector Question any suggestions?

Basic physics help Alright, so to find the magnitude and direction of the plane's average velocity i used the vave = delta r/delta t formula to find average velocity for vx and vy and then i used pythagorean theorem to find v and i got 910.8 km/h... does that make any sense? Now I am assuming...
34. ### Vector Question any suggestions?

based on your last reply, what's the definition for magnitude? b/c now I've got to find magnitude and direction for average velocity and then average speed
35. ### Vector Question any suggestions?

Basic physics help ok.. so i used pythagorean theorem and got this: r = 1080.020833 which i'll round to 1080 for 4 sig figs. Now finding r gave the the magnitude would i use the tan formula to find direction? now i found the angle to be = tan-1 (966/483) and got 63.4 * but how do i...
36. ### Vector Question any suggestions?

ok.. so i used pythagorean theorem and got this: r = 1080.020833 which i'll round to 1080 for 4 sig figs. Now finding r gave the the magnitude would i use the tan formula to find direction?
37. ### Vector Question any suggestions?

Basic physics help A plane flies 483 km east from city A to city B in 45.0 min and then 966 kim south from city B to city C in 1.50 h. For the total trip, what are the magnitude and direction of the plane's displacement, the magnitude and direction of its average velocity, and its average...
38. ### Vector Question any suggestions?

Would this be correct: I calculated r the distance between points A and C by r = (483 km) + (- 966 km) to get - 483 km So the planes magnitude was 483 km in the negative direction, or south east. Is this correct?
39. ### Vector Question any suggestions?

A plane flies 483 km east from city A to city B in 45.0 min and then 966 kim south from city B to city C in 1.50 h. For the total trip, what are the magnitude and direction of the plane's displacement, the magnitude and direction of its average velocity, and its average speed?
40. ### HELP Assignment due in an hours

a = (3t-15.0)/t is what i got for a Now i need to sub that into above to solve for t
41. ### HELP Assignment due in an hours

1/2at2 - 1/2(1.5)t2 + 15t -35.0 = 0 what do i do from there
42. ### HELP Assignment due in an hours

i've got another one too.. A motorcycle is stationary at traffic light. At t=0s, light turns green and it accelerates at 3m/s2 when light turns gree, a car is 40 m behind the motorcycle and traveling at 15m/s. At that instant, car slows down at a constant rate so it is never closer than 5 m to...
43. ### HELP Assignment due in an hours

HELP ! Assignment due in an hours A gold ball is hit from ground @ 25* to the horizontal. When it lands, it has a velocity of 20 m/s @ 30* below horizontal. A) find initial speed B) time that ball is in air C) height of landing pt. relative to start pt, which may be positive or negative

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45. ### Help stuck with vector problem.

i've figured out an answer, not sure if its right but if anyone's willing to check here is it: The explorer must travel 12. 61 km. I got 67* but that doesn't entirely make sense now that i look at it. Anyhoo let me know what you think.
46. ### Help stuck with vector problem.

i tried drawing the diagram on paint, doesn't look too good but that's what I am thinking. Find the distance C
47. ### Help stuck with vector problem.

In my diagram I've got two vectors that I've named A and B. SO do i subtract the two to get the distance between them C?
48. ### Help stuck with vector problem.

i've got one, I'm just not sure what I'm looking for afterwards.
49. ### Help stuck with vector problem.

If anyone's got any hints or directions as to how to go about solving this problem, PLEASE help! An explorer is caught in a whiteout (in which the snowfall is so thick that the ground cannot be distinguished from the sky) while returning to base camp. He was supposed to travel due north for...