|
A converging lens has a focal length of 10 cm.
If an object is placed 50 cm from the lens, what will be the magnitude of the
magnification of the image? 1/5
1/4
1/2
2
5 |
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Viewed from one frame of reference, a 1500 kg
automobile with a velocity of 25 m/s collides with a 1000 kg automobile at rest. The two
automobiles stick together. What would be the velocity of the two cars immediately after
the collision in a frame of reference moving at 10 rn/s in the same direction as the 1500
kg automobile? 25 m/s
15 m/s
5 m/s
0 m/s
-5 m/s |
|
The most common isotope of Uranium, 23892U,
radioactively decays into 20682Pb, Lead, by means of a series of
alpha and beta particle emissions. How many of each particle must be emitted? 32 alphas and 10 betas
16 alphas and 16
betas
16 alphas and 8
betas
8 alphas and 6
betas
4 alphas and 16
betas |
|
A small bird with a mass of 0.5
kg takes off from the ground and flies with an upward velocity of 3 m/sec for 10 seconds.
Which of the following is closest to the minimum power that must be developed by the bird? 60 watts
15 watts
9 watts
6 watts
1.5
watts |
|
Two iron spheres separated by some distance have
a minute gravitational attraction, F. If the spheres are moved to one half their original
separation and allowed to rust so that the mass of each sphere increases 41%, what would
be the resulting gravitational force? 2F
4F
6F
8F
10F |
|
After the switch in the accompanying circuit has
been clossel for a very lorg time, what would be the total current in the circuit shown
below? 0.53
amperes
0.90
amperes
1.5
amperes
1.9
amperes
2.0
amperes |
|
Which of the following graphs would best
represent the resistance versus temperature relationship for a superconductor? |
|
A moving charged particle experiences no
magnetic force Which of the following statements MUST be true? The
particle must be moving parallel to a magnetic field.
The particle
must be moving perpendicular to a magnetic field.
The particle
must NOT be moving in a magnetic field.
The particle
must be moving in an electnc field.
None of the
above must be true. |
|
The NEXT two questions refer to the following
situation. Three electric charges (Q1, Q2 & Q3) are
arranged at three comers of a rectangle as shown in the diagram and each has a charge of
-40 nC. What is the magnitude of the net force on Q2?
1.4 x
10 -5 N
1.7
x 10 -5 N
4.2
x 10 -5 N
4.6
x 10 -5 N
14.7
x 10 -5 N |
|
What would be the magnitude of the total
electric field at center point X? 1440 N/C
720 N/C
360 N/C
180 N/C
90 N/C |
