Physics 109 -- Homework # 1

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NAME: _______________________, Sect. #_______

Physics 109 Homework # 1
due Monday, September 18, 2001

Prefixes for large numbers are k for kilo (1000), M for mega (10⁶) and G for giga (10⁹).
Prefixes for small numbers are m for milli (10^-3), m for micro (10^-6), and n for nano (10^-9).
Weight of a mass depends on how strong gravity is at that location. On earth, the acceleration of gravity is g = 9.8 m/s². The weight is figured as w = mg.
spring constant k is related to force F and elongation (stretching) x by F = kx.

A dog can hear frequencies up to 40,000 Hz
1. express this frequency in kHz.
2. find the period of this oscillation. Express the answer in s, in ms and in m s.
If Jim has a mass of 70 kg, how much many Newtons does he weigh on earth where the acceleration of gravity is g= 9.8 m/s²?

if Jim is on the moon where the acceleration of gravity is only 0.15 m/s², how much will he weigh?
for the oscillation on the right, the horizontal axis (time) is in msec.

find the period T in sec and in msec:

T =

find the frequency in Hz and in kHz:

f =

find the amplitude

A =
The length of a spring is measured for different pulls F:

pull F: 2N 4N 6N 8N 10N
length of spring: 20cm 25cm 30cm 35cm 40cm

Find the spring constant in N/cm and in N/m
For simple harmonic motion (mass on a spring) the frequency is the same, no matter whether the amplitude is large or small.

pull F:	2N	4N	6N	8N	10N
length of spring:	20cm	25cm	30cm	35cm	40cm