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# PHYS 172 Final

True/False: The rate of change of momentum is always tangent to the path False
True/False: The momentum of an object always point in the same direction as its velocity. True
True/False: In general, the total momentum of a physical system can change with time. True
True/False: A heavier object attracts a lighter object with larger gravitational force than the lighter object attracts the heavier one False
True/False: Momentum is always perpendicular to net force. False
True/False: The period of oscillations is independent of amplitude. True
Is the mass of a hydrogen atom smaller, larger, or equal to the sum of the proton mass and the electron mass Smaller
Position update formula Rf=Ri+Vavg(Tf-Ti)
What are the four fundamental forces? Gravity, electromagnetic, strong, and weak force
When is linear momentum conserved? When the system is isolated; when Fnet is 0 (external forces cancel)
Total stretch of two spring in series? 2s
Total stretch of two springs in parallel s/2
Frequency equation 1/T
A change in what results in a parallel force only (perpendicular force =0)? magnitude of momentum
A change in what results in a perpendicular force only (parallel force =0)? direction of momentum
What type of force exist on an object moving in a circle? perpendicular
Work is positive when delta(r) and F are in the _________ direction. same
The change in potential energy (delta U) is equal to... -W
K(planet)+U(sys) = constant
K+U<0 Bound or unbound? Bound
K+U>=0 Bound or unbound? unbound
True or false? If object does not move, work can be done False
Work equation F.d Fdcos(theta)
True or false? In a round trip the potential energy does not change True
Collisions at the __________of a falling object impart more impulse than collisions at the _________ of the falling object. bottom; top
Adding a photon ________ the energy of the atom increases
Center of mass equation (m1r1+m2r2+m3r3...)/(m1+m2+m3...)
Angular momentum equation (L=?) L=rxp L=rpsin(theta)
Torque equation T=rxF T=rFsin(theta)
For two vectors along the same line, the torque is equal to 0
What is the fundamental assumption of statistical mechanics? Each microstate corresponding to a given macrostate is equally probable
True or false? For a monoatomic gas there is rotational but not vibrational energy False; There is no rotational or vibrational
What is the formula for Evib and Erot for a diatomic gas kT
For Esys = 0, is K = -U? Why or why not? No, because delta(K) = -delta(U)
For curved motion of people in a car, what is the direction of the net force acting on the people as the car is turning? Towards the center of the 'circle'
In a ferris wheel at constant velocity, is the magnitude of net force constant? What about the direction? Magnitude is constant, (Fperp. = mv^2/R) Direction is not constant because always pointing towards center of motion
In an inelastic collision, which will experience a larger change in velocity, an object of large or small mass? Small
In an inelastic collision, which will experience a larger change in momentum, and object of large or small mass? The change in momentum is equal because of the law of conservation of momentum
Positive or negative? 1. The work done by the engine on an accelerating car. 2. The work done by the brakes on a decelerating car. 1. Positive 2. Negative
How can you determine the work done by the Earth on the moon? 0 because of the circular path, force is only perpendicular and therefor the angle is 90deg. w=F(deltaR)cos(theta)... cos(90)=0
Positive or negative sign of work? 1. A spring being stretched. 2. A spring being compressed 1. negative 2. negative *Work done by a spring will always be negative unless it is at equilibrium, at which point the work is 0
For an oscillating O2 molecule, how does the mass of the molecule compare to the total mass of 2 non interacting oxygen atoms? The mass of the O2 molecule is smaller
Two identical balls go down a hill, Ball 1 slides and Ball 2 rolls. 1. Which will have a larger Ktotal? 2. Which will have a larger Ktrans? 3. Which will have a larger Krot? 4. Which will get down first? 1. They will have the same Ktot 2. Ball 1 will have a greater Ktrans 3. Ball 2 will have a greater Krot 4. Ball 1 will get down first
When you add a block of something at a temperature to a bucket of water at another temperature, what form of the energy principle allows you to solve for the final temperature, specific heat of the block, etc. E(water)+E(block) = 0 *use E=mc(deltaT)
Vector subtraction: For vector C = vector A - vector B, vector C goes from the _____ of vector ___ to the ____ of vector ____ Tip of A to tip of B
In a spring-mass system, what does the energy principle tell you? Uspring + Kmass = constant... so Uspring(f)+Uspring(i) = Kmass(f) + Kmass(i)
What is the fundamental assumption of statistical mechanics? Every microstate is equally probable
Mass of a proton 1.67e-27
If you are on a rollercoaster, what must be true of the forces for you to feel weightless? How would you determine the speed at this point The force from the seat must be zero so the only force working on you is mg. To solve for speed, mg=mv^2/r
Each Einstein model is represented by ____ one-dimensional oscillator(s). 3
For a chain in a pile being straightened, what is the distance of the point particle system d(cm) = d-1/2
Created by: jkmccord11