Blog

Which of the following scenarios indicates there has been no change in the potential energy of the object(s)?  Choose all that apply.

The Millennium Falcon is parked near the planet Endor.  The Falcon accelerates from rest at a constant rate, heading due east, until reaching a velocity of [v1]m/s after [t1] s.  The Falcon flies at this speed for [t2]s continuing due east and then notices a tie fighter in its rearview mirror.  The Falcon decelerates at a constant rate and comes to a stop after traveling another [x1] m due east.  It then prepares to turn around and chase the tie fighter down and save the universe.   What is the net displacement of the Falcon during the initial acceleration considering the parking spot as the origin in meters?  Enter only the number into the box.

You are on a cliff, and you decide to throw your empty water bottle to the bottom so you have less to carry down.  You decide to toss the bottle straight up into the air at [v1]m/s and let it fall from there to the ground.  You are [x1]m above the ground.   What is the maximum height of the bottle above the ground in meters? Enter only the number into the box.

Identify the number protons, electrons, neutrons in the charged isotope below.  58Fe+2 Protons: [p] Electrons: [e] Neutrons: [n]

How many zeroes in this number are significant? 0.00004078

How many significant figures is in this reported values? 0.00004078 

The satellite Glonass is [height] mi above the surface of the earth.   What is the time period of Glonass as it orbits the earth in hours?  Enter only the number into the box.

You want to make a life size mobile of famous cartoon characters to greet people outside of a museum.  You have a Mickey Mouse that has a mass of 10lbs, an Olive Oyl that is 8lbs, a Charlie Brown that is 12 lbs, and a Velma Dinkley that is 11 lbs.  You have a 30ft rod whose center of mass is at the center of the rod.  If Mickey Mouse is placed at the 10ft mark and Olive Oyl at the 18ft mark and Charlie Brown at the 8ft mark, where should you place Velma Dinkley to balance this hilarious mobile?   At which mark, in feet, should we place Velma Dinkley?  Enter only the number into the box.

Use Newton’s laws to solve.   An astronaut is in a rocket, standing upright relative to the ground on a seat, in a nosedive toward the earth accelerating at [a]m/s2.  The pilot has a mass of [mass] kg.  What is the pilot’s apparent weight in N in this circumstance? Enter only the number into the box.

The Millennium Falcon is parked near the planet Endor.  The Falcon accelerates from rest at a constant rate, heading due east, until reaching a velocity of [v1]m/s after [t1] s.  The Falcon flies at this speed for [t2]s continuing due east and then notices a tie fighter in its rearview mirror.  The Falcon decelerates at a constant rate and comes to a stop after traveling another [x1] m due east.  It then prepares to turn around and chase the tie fighter down and save the universe.   What is the acceleration the Falcon experienced as it began its journey from the parking spot near Endor in m/s2? Enter only the number into the box.