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Physics Review
Physics Review
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Practice problems for the SAT II physics subject exam, or comprable other exams.
Flashcards
20 cards
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Practice quiz
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Questions
20
Answers
1
[Refer to the figure] How much frictional force, in newtons, is opposing the forward motion?
12
3
40
4
2
To double the period of an ideal pendulum, we should change the length
L
of the string to
¼ L
½ L
2L
4L
3
[Refer to the figure] After 2 seconds, the momentum, in kilogram·meters per second, will be
24
12
45
30
4
Two carts (mass 0.40 & 1.2 kg) are released from rest; the light cart rolls at 0.6 m/s; v
heavy
?
1.8 m/s
0.60 m/s
0.45 m/s
0.20 m/s
5
The approximate speed of light in
water
, in meters per second, is
5.8×108
3.0×108
2.3×108
1.0×108
6
Two forces, 10 N and 7 N, act on a body.The
minimum
resultant (net) force magnitude, in N, is
3
7
0
√149
7
What
average braking force
is required to stop a 2500 kg car with speed 30 m/s in 15 seconds?
1.13 MN
10 kN
2.5 kN
5.0 kN
8
Consider the circuit in the diagram below. What is the current as measured by the ammeter?
6 A
1 A
2 A
3 A
9
Which of the following statements about
simple harmonic motion
described below is correct?
Maximum velocity occurs when the acceleration is a minimum
Max. velocity occurs when displacement (from eq.) is maximal
Maximum velocity and max.acceleration occur at the same time
Velocity is always directly proportional to displacement
10
Light (frequency
f
) falls on a photoemissive metal, ejecting electrons. To increase their k.e.:
Increase the intensity of the incident light
Decrease the work function by using a different metal
Increase the frequency of the incident light
Increase both frequency and intensity of light
11
Two frequencies together produce 3 beats per second. If one is 400 Hz, what may the other be?
3 Hz
403 Hz
397 Hz
1200 Hz
12
Two resistors (20Ω, 60Ω) are in series. Voltage across the 20Ω is 80V. Current through the 60Ω:
cannot be calculated with the given information
is 4.0 A
is 1.0 A
is about 5 A
13
The Sun’s energy is believed to be a result of
oxidation of hydrogen.
nuclear fission.
nuclear fusion.
oxidation of helium.
14
3 wires:
copper, iron, nichrome
(same length, x-sec) in ∥ with a cell.
I
through the Cu wire is
less than in the other wires.
greater than in the other wires.
greater than in the iron wire, but less than the nichrome.
the same as in the other wires.
15
[Figure] The compass needle is deflected to point south. The current in the wire is directed
up
down
west
east
16
The image & object are the same size when d
obj
=20cm. The
largest real image
appears when d
obj
≈
5 cm
40 cm
10 cm
15 cm
17
We project ball X horizontally and drop ball Y at the same time; both start at the same height.
X and Y will reach the level ground at the same time
Y will reach the ground first
X will reach the level ground first
we need to know the masses of X and Y to decide
18
To
double the elastic p.e.
of a spring with force const.
k
, by what factor must
x
be changed?
½
√2
2
¼
19
Fast alpha particles are shot at a thin metallic foil. We observe that most of the particles
are widely scattered.
are absorbed.
bounce backward.
pass through with virtually no deflection.
20
A motor operates from a 120V source; coils have 30Ω of resistance. How much power is generated?
3600 W
30 W
4 W
480 W
