What does the term Hubble time mean in cosmology, and what is the current best calculation for the Hubble time?

Acceleration a has the dimensions of length per time squared, speed v has the dimensions of length per time, and radius r has the dimension of length. What are the dimensions of the following combinations of quantitiesa=vr

Two balls undergo inelastic collision. The y-momentum after the collision is 98 kilogram meters/second, and the x-momentum after the collision is 100 kilogram meters/second. What is the magnitude of the resultant momentum after the collision?

A? is a conductor installed on the supply side of a service or separately derived system to ensure the required electrical conductivity between metal parts required to be electrically connected.

Imagine you are on a roller coaster, riding a skateboard, or running across the ball field. What are some clues that you are moving?

What causes the Sun's rays to be direct or indirect?

A motorist driving at 25 meters/second decelerates to 15 meters/second. The combined mass of the vehicle and the driver is 1.5 * 10³ kilograms. What is the amount of mechanical work done by the vehicle?

All forces are different each exerts a particular type of effect on an object

Witch statement about polymers is true

Two bullets have masses of 3,0 g and 6.0g, respectively. both are fired with a speed of 40.0 m/s. Which bullet has more kinetic energy? What is the ratio of their kinetic energies

What does it mean that a form of energy might take more energy to harness than it provides? Are renewable resources always renewable, or can they become non-renewable? Why aren't renewable resources used for everything that we use energy for?