Starting from rest a 5.00 kg steel sphere rolls down a frictionless ramp with a height of 4.00 m. what is the spberes speed when it reaches the bottom of the ramp
/s

a. 8.85

b. 78.4

c. 39.2

d. there is no energy lost from the system

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Figure 9 on page 362 shows various motions of balls. the curved path followed by the yellow ball in b in picture b is result of a) inertia b) centripetal motion c) gravity and horizontal velocity d) linear motion