4. An electron in a field of 1 NC-1 will have an approximate acceleration,
a) 1.7 x 1011 ms?
c) 1 x 1012 ms?
b) 1 x 10 m
d) 1x 10ms-a​

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up