# Recent content by flyboy9

1. ### Calculating uncertainty.

In my physics class we are constantly taking measurements and calculating uncertainty. Unfortunately my teacher has neglected to teach us how to calculate it and I am at a loss. Currently I am working on calculating moment of inertia including its uncertainties. Can anyone walk me through...
2. ### Alpha particle momentum

This homework which is based off of our book only uses 2 significant digits for mass of proton and neutron. total mass = 4*1.7e-27 = 6.8e-27 I apologize for the typo earlier as well.
3. ### Alpha particle momentum

I used numbers in the back of our book that our homework is based off of
4. ### Alpha particle momentum

I would have never caught that. Thank you. The process seems correct to you?

6. ### Alpha particle momentum

i thought so too... maybe the online program has the wrong answer.
7. ### Alpha particle momentum

Homework Statement An alpha particle (a helium nucleus, containing 2 protons and 2 neutrons) starts out with kinetic energy of 10 MeV (10*10^6 eV), and heads in the +x direction straight toward a gold nucleus (containing 79 protons and 118 neutrons). The particles are initially far apart, and...
8. ### Change in internal energy of an inelastic collision.

so would I calculate the magnitudes of the velocities first?
9. ### Change in internal energy of an inelastic collision.

Homework Statement A car of mass 2200 kg collides with a truck of mass 4500 kg, and just after the collision the car and truck slide along, stuck together, with no rotation. The car's velocity just before the collision was < 35, 0, 0 > m/s, and the truck's velocity just before the collision...
10. ### Energy in a sprin mass system

Homework Statement A horizontal spring-mass system has low friction, spring stiffness 165 N/m, and mass 0.2 kg. The system is released with an initial compression of the spring of 7 cm and an initial speed of the mass of 3 m/s. (a) What is the maximum stretch during the motion? (b) What is the...