When an electron circles in a uniform circular motion, which describes its kinetic energy? It remains the same. O It decreases with each full circle. O It increases with each full circle.

E7P7

A proton is released from rest at x=2m in the potential shown. What does the proton do immediately after being released? V (V) 50 - x (m) 1 3 -50 Move to the right with increasing speed. Move to the left with increasing speed. Stay at x=2m. Move to the right with constant speed. Move to the left with constant speed. 2.

Find the force vector F on an object of mass m the uniform gravitational field when it is at height z = 0. The +z direction is up. Express vector force in terms of m, z. g. and k, where k is the unit vector in the +z direction. To create the k character: In the equation editor window, select "More", then select "Vectors", and you will find what you need. To write out a vector: for example, if the answer has both x and y components, you would answer in the format Fi + Fj F(z) = -mgk Now find the gravitational potential energy U(z) of the object when it is at an arbitrary height z. Take zero potential to be at position z=0. Keep in mind that the potential energy is a scalar, not a vector. Express U(z) in terms of m. z. and g. U(2)= In what direction does the object accelerate when released with initial velocity upward? downward Oupward or downward depending on the initial mass m. upward or downward depending on the initial velocity upward Now consider the analogous case of a particle…