Physics 102 Assignment 1 Problems (Spring Term)
Hello, dear friend, you can consult us at any time if you have any questions, add WeChat: daixieit
Physics 102 Assignment 1 Problems (Spring Term)
A slingshot consists of a light leather cup, containing a stone, that
is pulled back against two parallel rubber bands. It takes a force of
15 N to stretch either one of these bands 1.0 cm. (a) What is the
potential energy stored in the two bands together when a 50-g stone
is placed in the cup and pulled back 0.20 m from the equilibrium
position? (b) With what speed does the stone leave the slingshot?
a) PE = 60 J b) v = 49 m/s
A simple harmonic oscillator has a total energy of E . (a) Determine
the kinetic and potential energies when the displacement is one half
the amplitude. (b) For what value of the displacement does the
kinetic energy equal the potential energy?
3E
a) KE = |
E
PE = 4 |
A
b) x = |
An object-spring system oscillates with an amplitude of 3.5 cm. If
the spring constant is 250 N/m and the object has a mass of 0.50 kg,
determine (a) the mechanical energy of the system, (b) the maximum
speed of the object, and (c) the maximum acceleration.
a) E = 0.15 J b) v = 0.78 m/s c) a = 18 m/s2
Two playground swings start out together. After ten complete
oscillations the swings are out of step by a half-cycle. Find the
percentage difference in the length of the swings.
% difference = 9.8 %
Ocean waves are traveling to the east at 4.0 m/s with a distance of
20 m between crests. With what frequency do the waves hit the front
of a boat (a) when the boat is at anchor and (b) when the boat is
moving westward at 1.0 m/s?
a) f = 0.20 Hz b) f = 0.25 Hz
The position of a 0.30-kg object attached to a spring is described by
x = (0.25m)cos(0.4π t)
Find (a) the amplitude of the motion, (b) the spring constant, (c)
the position at t = 0.30 s, (d) the object’s speed at t = 0.30 s and
e) the object’s acceleration at t = 0.30 s.
a) A = 0.25 m b) k = 0.47 N/m c) x = 0.23 m d) v = 0.12
m/s (is this + or - ?)
e) a = 0.36 m/s2 (is this + or - ?)
2022-02-16