Physics Honors
Chapter 7 Test
Form
1
F
ma
r
v
a
c
2
2
r
GmM
F
g
Constant
Kepler
T
R
2
3
Given:
2
0
ax
bx c
T
r
v
2
N
s
fs
F
F
N
k
fk
F
F
x
k
F
e
then:
2
4
2
b
b
ac
x
a
2
1
2
K
mv
2
2
1
x
k
U
e
g
U
mgh
ΔΔ
K
U
Q
2
2
11
10
67
.
6
kg
m
N
G
A recently discovered planet orbits a distant star.
The planet has an orbital period of 4.32 x 10
6
seconds and an average
orbital radius of 3.10 x 10
10
meters.
1)
What is the mass of the star?
A coin with a mass of 5 grams rests on a spinning disk (a “turntable”) at a spot 15 cm from the axis of rotation.
The
turntable rotates so that the coin moves at 0.60 m/s in a circular path without slipping.
The coefficient of friction between
the coin and the surface of the turntable is 0.50.
2)
What friction force acts on the coin?
3)
The angular velocity of the turntable is increased until the coin slides.
What is the speed of the coin when it slips?
A 0.010kg marble is propelled sideways by a spring toward the
bottom of a frictionless circular loop of radius
r
= 0.60 m, as shown
at right.
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This note was uploaded on 02/10/2012 for the course PHYS 123 taught by Professor Phys123 during the Spring '10 term at Buena Vista.
 Spring '10
 Phys123

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