1. ### 1-D Kinematics Problem

Even if it's quadratic, why wouldn't you be able to solve for t?
2. ### 1-D Kinematics Problem

Why can't you solve for t?
3. ### Free-fall gravity problem

Yes, when the object is in freefall on Earth, gravity = a = 9.8m/s^2 down. Signs are optional but you could say -9.8n/s^s. In 2D, the gravity is always 9.8m/s^2 down on the object. It doesn't matter how the object is moving or thrown, gravity is always down.
4. ### Acceleration due to Gravity

Hitchhikers reference eh? The other object should be the falling whale.
5. ### Kinematics Problem

I just gave you the answer.

Oh I see. Thanks for setting me straight. I'm still learning and your opinion is very helpful to me.

Area of wire, cross section area.

Well, circumference=pi*diameter, lol 102 turns = 102 circumferences

Oh I see. What's the step after finding R?
10. ### Kinematic graphs

The graph of the acceleration is the graph of the derivative of the v-graph. Find the slope at each second and graph it onto a new graph. The a-graph is not linear.

Isn't the L for B=UIN/L the length of the solenoid not the length of the wire?
12. ### Conservation of Energy max height

Break the velocity into components.

Yes, i know.
14. ### Kinematics Problem

Wait, I think it was the d for the 4th second, from 3-4s. Because the first second is 0-1s, second second is for 1-2s, etc. So Vf=vo+at V@3=5+9.8*3 and V@4=5+9.8*4 Vf^2=Vo^2+2ad (V@4)^2=(V@3)^2+2*9.8*d Find d
15. ### Kinematics Problem

Well, d=Vot+.5at^2 so d should be 98.4m. Did you get that?