Other Physics Answers

A teen is trying to practice her aiming skills with her slingshot. It contains a stone that is pulled back in a rubber band. It takes a force of 50 N to stretch the band a full distance of 0.25m. What is the potential energy stored in the band when a 0.5g stone is loaded on the band?

When that is solved the next question is, with what speed does it leave the slingshot if all the potential energy is transferred into kinetic energy at the moment the rock is let go?

A truck heading east has an initial velocity of 6 m/s. It accelerates at 2 m/s² for 12 seconds. What distance does the truck travel in the given time?

1. Mr Grewal (m = 85 kg) and Ms Jang-Ing (m = 65 kg) are standing still on a 10 kg raft which is floating south down a river of 2.5 m/s. They both decide to jump off the raft at the same instant. Mr Grewal gives himself a velocity of 4.5 m/s [E] (with respect to the water) while Ms Jang-Ing has a velocity of 2.7 m/s [N 37° E] (with respect to the water). What is the velocity of the raft (with respect to the water) after they jump?

a driver is planning to make a short trip with his car,one that is a distance of 3km and one that is a distance of 4 km.The resultant displacement from these two trips is 5km in any given direction. Which vector diagram will be correct for it

charge is flowing through a conducter at the rate of 40C/min.If 30 J of electrical energy are converted to heat in 30s.What is the potantial drop across the conducter?

A heavy block is suspended from a vertical string the elastic potential energy stored in the spring is 4J what is the spring constant if the elongation of the spring is 10cm?

An electron in the n = 2 level of a hydrogen atom is struck by a photon, causing it to move up to level n = 4. What was the energy of the absorbed photon, in electron-volts? What was the frequency of the absorbed photon from the previous problem, to two decimal places? 

A typical E.coli bacteria is about 5 microns in length. How long is the length in millimeters

An electron in the n = 2 level of a hydrogen atom is struck by a photon, causing it to move up to level n = 4. What was the energy of the absorbed photon, in electron-volts? 

26. Calculate the resultant of the four forces working on an object:

25 N 20° W of N

60 N 18° S of W

45 N W

35 N 49° E of N

Use the perpendicular component method. Express the answer in unit vector notation.  (6)