Why did it take a long time to confirm the existence of galaxies outside of the Milky Way? Other galaxies were difficult to observe because they were very faint. Observational tools needed to detect other galaxies were not available. It was difficult to measure distances to far away objects and confirm that they were outside of the Milky Way. Galaxies are very far apart. Therefore, it took a long time to come across one in observations.

That previous shot was a bust and the player tries for a second shot. This time they throw the ball at $8m/s$ with a 45 degree angle. The height of the throw is 2.4 m above the floor and the hoop is 3.1 m tall. How long will the ball be in the air before reaching the height of the hoop? (hint:we've done this in examples and there are two ways of doing it) 8.11 sec 0.63 sec 0.12 sec 1.01 sec 1.35 sec 5.31 sec

Which of the following was a direct result of the work of Galileo and Newton? Increased observation and experimentation Increased authority of the Church Increased power of kings Increased support of free enterprise

The amount of heat needed to raise the temperature of 1 kg of that material by $1^{\circ }C$ A Temperature B Thermal Energy C Heat D Specific Heat

The total resistance in a parallel circuit is found by adding the individual resistors. True False

The electrical potential energy per charge is known as __ current voltage resistance electricity

What's the name for a moving charge? voltage resistance static electricity current

$39$ The width of the gap produced by the cut increases as the thickness of the material increases. True or False

Pitch is measured in: Decibels Hertz Dynamics Meter

If a sample is unable to return to its exact original shape it has undergone __ deformation. A) plastic B) dislocation C) yield D) elastic

1. A girl exerts a 36 Newton horizontal force as she pulls a 52 Newton sled across a cement sidewalk at constant speed. What is the coefficient of kinetic friction between the sled and sidewalk? Ignore air resistance.