Recent content by physicznoob

huh? if you mean velocity wise, at the top for vertical motion.

i still get the wrong answer...

a = v2 - v1 / t t = v2 - v1/ a t = 0 - 16 / -9.81 t = 1.63 s.

Homework Statement A student is standing on the top of a building and he throws an object into the air with a speed of 16 m/s at an angle of 25 degrees above the horizontal. If the building is 75 m tall, how far from the base of the building will the object hit the ground? Homework...

i still don't get it

the line crossing the x-axis is simply the line that tells you the 0 point. it plays no significance unless your graphing line passes it. at the point that it passes that horizontal x-axis line, that would tell you your velocity is 0 m/s.

ask yourself what velocities you're seeing. velocities include direction. the Y - axis is telling you the velocity of the object, whereas the x-axis is telling you the time. you can tell the y-axis is velocity because of the negative values towards the bottom of the y axis. you can't see the...

look at the two velocities that are given to you. your only given velocities, no other information is given. not even distance or time. relative velocity is when you compare an objects velocity to a relative object. so for example, a poles velocity relative to the Earth is 0 m/s, whereas your...

so we're bargaining now? lol.

Homework Statement This question is something we got in our review booklet and I HATE projectile motion. An object is thrown horizontally with a velocity of 18 m/s from the top of a cliff. If the object hits the ground 100 m from the base of of the cliff, how high is the cliff...

lol. well thanks i guess. but a whole bunch of other people in my class got something else. it's weird.

remember, period is dependent on the mass for a spring. for a pendulum it isnt.

Homework Statement This is a question from a test i had today..i want to know if I did it right or not. A mass on a spring with spring constant 700 N/m is compressed 16 cm. If the maximum value of the speed is 12 m/s, what is the mass of the mass in kg? Homework Equations Ep =...

thx guys! i figured them both out. now i just need to be able to apply them in my exam today xD

Homework Statement a) A 0.25 kg pine cone falls from a branch 20 m above the ground. if it actually hits the ground with a speed of 9.0m/s, what was the average force of air resistance exerted on it? b) For the pulley system illustrated to the right, when the masses are released, what is the...