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...
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...
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?
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...
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
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...