1. predicts that the strong, weak, and electromagnetic forces should become indistinguishable at high temperatures
2. is a single force that unifies the electromagnetic and weak forces.
3. a dramatic expansion of the universe thought to have occurred when the universe was only a tiny fraction of a second old.
4. us to think about why the sky is dark at night.
5. observations of provide a way to test our theory of the big bang.
6. when a particle of ordinary matter meets its precise opposite particle of antimatter, the is with complete conversion of mass into energy.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c. m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve