A small solid sphere with radius 0.46 cm and mass 0.64 g rolls without slipping on the inside of a large fixed hemisphere with radius 0.16 m and a vertical axis of symmetry. The sphere starts at the top from rest. (a) What is its kinetic energy at the bottom

When applying kirchhoff's rules, one of the essential steps is to mark each resistor with plus and minus signs to label how the electric potential changes from one end of the resistor to the other. the circuit in the drawing contains four resistors, each marked with the associated plus and minus signs. however, one resistor is marked incorrectly. which one is it?

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.