Astronomers initially had difficulty identifying the emission lines in quasar spectra at optical wavelengths because

A 95.00 kg man on ice skates catches a moving ball at 18 m/s. the man is initially at rest. the man and ball move together after the collision. the ball's mass is 0.14 kg. what is the final velocity?

If the forces acting on an object are balanced, the object may change speed, change direction, or do both. true or false.

Which of the following have circular orbits? moons comets planets none of the above

How many quantum numbers are used to describe the energy state of an electron in an atom

Which are examples of short-term environmental change? Check all that apply. tsunamis El Niño large asteroid and comet impacts volcanic eruptions global warming i just took the test it's: tsunamis, El Nino, and volcanic eruptions.

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?

A pendulum bob is made from a sphere filled with water. What would happen to the frequency of vibration of this pendulum if the sphere had a hole in it that allowed the water to leak out slowly?

Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball above the gym floor when its total mechanical energy is 41.70 J? Round to the nearest number.

Which of the following is the best description of a graph? A. Equations that can be plotted B. A representation of an equation C. Independent and dependent variables D. x and y lines

Which of the following statements concerning Howard Gardner's multiple intelligences is not correct? A. Gardner is not interested in assessing levels of intelligence. B. Gardner has based his theory on research in various areas of psychology. C.