Physics II Questions (Part 1) - Please show why you chose an answer as the corre
ID: 2141145 • Letter: P
Question
Physics II Questions (Part 1) - Please show why you chose an answer as the correct one for each.
1. 1. A spring with a spring constant 60.47 N/m is placed on a horizontal frictionless surface and stretched a distance of 78.45 m. What would be the maximum acceleration of a 89.6 kg mass after being released? (remember to include the proper units
2. 2. A wave travels down a string with a speed of 33.56 m/s. If the mass of the string were increased 4 times without changing its length or tension, the speed of the wave would be... (remember to include the proper units)
3. 3. A wave travels down a string with a speed of 34.09 m/s. If the tension on the string were increased 4 times, the speed of the wave would be... (remember to include the proper units)
4. 4. What would be the speed of a wave on a string of linear mass density 6.93 kg/m and tension 5.67 N? (remember to include the units)
5. 5. When a mass m = 90.63 kg is hung from a vertical spring, it stretches a distance 2.55 m. What is the value of the Spring Constant? (remember to include the proper units)
6. 6. Where will the kinetic energy of a mass oscillating attached to a spring reach its maximum value?
a. At the maximum displacement position x= -xm only
b. At the maximum displacement positions x= xm and x= -xm
c. None of the given answers is correct
d. At the maximum displacement position x= xm only
e. At the equilibrium position at x=0
7. 7. Where will the elastic potential energy of an oscillating spring reach maximum value?
a. At the equilibrium position at x=0
b. None of the given answers is correct
c. At the maximum displacement positions x= xm and x= -xm
d. At the maximum displacement position x= xm only
e. At the maximum displacement position x= -xm only
8. 8. The restoring force always tries to move mass m towards...
a. Towards the maximum displacement position x= -xm
b. The equilibrium position at x=0
c. It depends on the material
d. None of the given answers is correct
e. Towards the maximum displacement position x= xm
9. 9. The restoring force has its maximum value at...
a. None of the given answers is correct
b. At the equilibrium position at x=0
c. At the maximum displacement positions x=xm and x= -xm
d. At the maximum displacement position x= -xm only
e. At the maximum displacement position x= xm only
10.
Explanation / Answer
1. a = kx/m = 52.95 m/s^2
2. V = sqrt (T*L/m)
=> v' = sqrt (TL/4m) = V/2 = 16.78 m/s
3. Similar as above formul used.
So v' = 2V = 2*34.09 = 68.18 m/s
4. V = sqrt ( T/(m/L)) = sqrt (5.67/6.93) = 0.9 m/s
5.mg = kx => k = mg/x = 348.3 N/m
6. Ans is (e) at equillibrium x = 0
7.Ans is (c) at both extremes x= +xm & x= -xm
8.ans (b) towards equillibrium at x=0
9. Ans (c) at both extremes