What energy does black holes give off? a) photons b) dark matter c) dark energy d) none of the above

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

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

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio