Dynamics Review Problems Quiz

Answer the following questions.  Turn in your answers at the end of class.  This is an open notes, free-for-all quiz worth 10pts.

1)  In one type of atomic bomb, roughly 2% of 40kg of Uranium is converted directly into energy.  How many joules of energy are produced?  For how much time could you power a 100W light bulb?

2)  A 100 Watt light bulb uses one joule of energy every second.  If all of the matter in the body of a 150lb person were converted into energy, for how much time could you power a 100W light bulb?

3)  If the Sun produces 4 × 10²⁶ Joules of energy every second, how many tons of matter are converted into energy in the Sun every second?  For how much time could you power a 100W light bulb using the energy produced by the Sun in one second?

4)  How many joules of energy are produced in the detonation of 1 ton of TNT?  Note:  this is a chemical reaction, rather than a conversion of matter directly into energy.

5)  If 4% of 40kg of Plutonium were converted directly into energy, how many joules of energy would be produced?  How many tons of TNT would this be equivalent to?

6)  The planet Klendathu has an acceleration due to gravity of -35.3 m/s and is the same size as Saturn.  What is the mass of the planet Klendathu?

7)  How much force is required to accelerate the Space Shuttle (including the Shuttle, External Fuel Tank, and Booster Rockets) to a speed of 8 km/s in 8.5 minutes?  Assume the mass of the shuttle remains constant.

8)  A 25kg block of wood is sliding across a wooden table top due to an applied force of 500 N.  The coefficient of friction between the two materials is 0.50.  If the block starts from rest, what will its velocity be after 10 seconds?