Recent content by nblu

Homework Statement A small plane flies a heading of 200km/h [W]. The wind speed is 50.0km/h [N] a) Determine the resultant groundspeed and direction of the plane b) What heading would the plane need to take to travel due west, and what would his ground speed be? Homework Equations...

Thank you rockfreak, for your comment. I'll make sure that I mention the polarity as well when I explain. :)

Hello, I was doing some questions and I thought I was understanding solenoids and magnets in incorrect way.. The question was, what would you feel if you bring a magnet close to a solenoid. I've wrote 2 possibilities, first is that they will repel and the second is that the solenoid would...

acceleration in free-fall is 9.8m/s/s right?

Homework Statement A satellite is designed to orbit Earth at an altitude above its surface that will place it in a gravitational field with a strength of 4.5N/kg. a) Calculate the distance above the surface of Earth at which the satellite must orbit. b) Assuming the orbit is circular...

oooh so since the kid is located 1.5m up, it would be 1.5 -1.2 = 30cm and that's the height the tree was hit with the snowball. i get it now! thanks for the looong two days of help :)

Thank You, So I used this equation to find the height at t = 0.5, \Deltad^{}_{y} = v^{}_{iy}\Deltat + 1/2a\Deltat^{2} since v^{}_{iy} = 0, \Deltad^{}_{y} = 1/2(-9.8m/s^{2})(0.5)^{2} \Deltad^{}_{y} = -1.2 m I get negative answer :( Did I use a wrong formula?

d_{x} = v_{x} x t t = 9.0 m / 18 m/s t = 0.5 s is this wrong?

Thank you, I really appreciate it! :)

Q: The average alcohol-free driver requires about 0.8 s to apply the brakes after seeing an emergency. Calculate the distance traveled after seeing the emergency before applying the brakes. with the question, the given speed is 17 m/s and t = 0.8. at first, i used d =vt equation to find the...

i'm sorry but i have no clue, i thought my answer to a) was right but since it's wrong i don't know where to start anymore..

oh you're right.. my bad, then I'm really stuck.. if my first answer was only telling "how long it will take for the snowball to hit ground", how can i find the tree's height and relate this equation to it?

oh oh, so I've used a different equation and i get a different t value, d_{x} = v_{ix} t + 1/2 a t^{2} 9.0m = (18m/s)(t) + 1/2(-9.8)(t^{2}) 9.0m = t(18m/s - 4.9m/s^{2} t) t = 0, OR 4.9m/s t = 18m/s t = 3.6 seconds would this be a new answer, or did i just do something stupid? lol

uh oh then I'm in a big trouble lol so I have to find how tall the tree is?

for c), i know that v_{fx} = v_{ix} = 18m/s, therefore, subsitute into v_{fy} = v_{iy} + a x t, since v_{iy} = 0, and a = -9.8m/s^{2}, i get; v_{fy} = -17.64 v_{f} = (18)^{2} + (-17.64)^{2} v_{f} = 25m/s tan\theta = 17.64 / 18 \theta = 44 degrees. Therefore, the velocity is 25 m/s...