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• Users: kara
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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. ### Net Ionic Equation clarification

I obtained a net ionic equn' as follows Ba +2 (aq) + SO4 2- (aq) ----> BaSO4 (s) Now I need clarification for the following question and my answer to it. What is the max amount of solid product that could be obtained by reacting one mole of each reactant? I believe that b/c of the...
3. ### Car Question

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...
4. ### Help with Stoichiometry and Volumetric Analysis

I need some help with this question. A piece of chalk (mainly calcium carbonate) is placed in 250 mL of 0.293 M HCl. All the CaCO3 reacts, realising CO2 gas, and leaving a clear solution. 50.00 mL of the solution is pipetted into another flask. 87.1 mL of 0.0567 M NaOH is required to titrate...
5. ### Standardization of An Acid

Don't worry about it, I figured it out :D
6. ### Standardization of An Acid

So for a I know that M (molarity) = moles of solute/liters of sol'n
7. ### Standardization of An Acid

It requires 46.5 mL of 0.215M NaOH to neutralize 15.0 mL of aqueous H2SO4. What was the molarity (M) of the acid sample? I'm not quite sure how to approach this quesiton, if anyone has and starter tips please let me know.
8. ### 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
9. ### The acceleration of a particle on a horizontal xy plane

so would i integrate a to find position and then velocity?
10. ### 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...
11. ### 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...
12. ### 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...
13. ### Basic Physics Question

if i multiply both sides by 2 to get rid of the 1/2 i get 106 = -(9.8) t^2
14. ### 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
15. ### Basic Physics Question

well the max height is 53 m, and it reaches that height when v = 0.0 m/s
16. ### 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
17. ### 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?
18. ### 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.
19. ### 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
20. ### Basic Physics Question

Alright, so i got 36.3 m/s for v0
21. ### 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?
22. ### 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?
23. ### 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 ?
24. ### 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 ?
25. ### Basic Physics Question

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

its on the ground?
27. ### 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
28. ### 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??
29. ### Basic Physics Question

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

now how do i find vertical component?
31. ### 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?
32. ### Basic Physics Question

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

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

how do i find the horizontal velocity component?
35. ### 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
36. ### 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...
37. ### 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??
38. ### 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...
39. ### 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
40. ### 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...
41. ### 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?
42. ### 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...
43. ### 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?
44. ### 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?
45. ### 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
46. ### HELP Assignment due in an hours

1/2at2 - 1/2(1.5)t2 + 15t -35.0 = 0 what do i do from there
47. ### 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...
48. ### 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

?
50. ### 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.