A ball is dropped from the roof of a building. If it takes the ball 2.6s to reach the ground, how tall is the building?

How does the speed of sound in water compare to the speed of sound in air

Which of the following can influence one's ability to detect stimuli and increase one's responsiveness to stimuli in dangerous situations? A. stimuli criteria B. response criteria C. difference threshold D. detection threshold

The volume of a block of iron is 9 cc and its mass is 70.83 g. what would be the volume of a block of aluminum that has the same mass as the block of iron? (the density of aluminum is 2.70 g/cc)

Amy has a mass of 30 kg and she is riding a skateboard traveling 5 m/s. whats her momentum?

Which terms refer to the smallest pure substances? A. mixtures and alloys B. molecules and atoms C. elements and isotopes D. metals and nonmetals

Visualize five horizontal sedimentary strata exposed in a cliff or canyon wall identified by consecutive numbers, 1 being the lowest bed and 5 being the highest. Which of the following statements concerning the strata are true? a.

The characteristics that follow are characteristics of two of Galileo's surviving double-convex lenses. The numbers given are magnitudes only; you must supply the correct signs. L 1: front radius 950 mm, rear radius 2700 mm, refractive index 1.

Which car has the most kinetic energy? A car of mass 1500 kg with speed 5 m/s or A car of mass 1300 kg with speed 3 m/s or a car of mass 1200 kg with speed 2 m/s or a car mass 1400 kg with speed 4 m/s

A 500 kg table with 4 legs rests on solid flat ground. I place 3 books on the center of the table with masses of 10 kg, 20 kg and 30 kg respectively. What is the normal force between the ground and one leg of the table?

Fluorine-21 has a half-life of approximately 5 seconds. What percentage of the original nuclei would remain after 20 seconds