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.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

The speed of light can be used to measure the

What is the volume of 2400kg of gasoline (petrol) if the density of petrol is 0.7g/km3