Download ap physics multiple choice medley

AP PHYSICS MULTIPLE CHOICE MEDLEY
1. For which of the following motions of an object
must the acceleration never be zero?
I. Any motion in a straight line
II. Simple harmonic motion
III. Any motion in a circle
a. I only
b. II only
c. III only
d. I and II only
e. None of these motions ever have zero
acceleration.
2. A rope of negligible mass supports a block that
weighs 50 N, as shown above. The breaking
strength of the rope is 75 N. The largest
acceleration that can be given to the block by
pulling up on it with the rope without breaking the
rope is most nearly
a. 6 m/s2
b. 7.0 m/s2
c. 10 m/s2
d. 15 m/s2
e. 5 m/s2
4. A ball is thrown straight up in the air. When the
ball reaches its highest point, which of the
following is true?
a. It is in equilibrium.
b. It has zero acceleration.
c. It has maximum momentum.
d. It has maximum potential energy from gravity.
e. None of the above
Questions 5-6
5. The figure above shows an object of mass 2.0 kg
that is suspended from a scale and submerged in a
liquid. If the reading on the scale is 18 N, then the
buoyant force that the fluid exerts on the object is
most nearly
a. 1.3 N
b. 0.75N
c. 2.0 N
d. 3.0 N
e. 0.25 N
6. If the density of the liquid is 200 kg/L, what is the
volume of the object?
a. 0.30 mL
b. 0.10 mL
c. 100 L
d. 0.20 mL
e. 10 mL
3. A compressed spring mounted on a disk can
project a small ball. When the disk is not rotating
as shown in the top view above, the ball moves
radially outward. The disk then rotates in a
clockwise direction as seen from above, and the
ball is projected outward at the instant the disk is
in the position shown above. Which of the
following best shows the subsequent path of the
ball relative to the ground?
7. An empty sled of mass M moves without friction
across a frozen pond at speed vo. Two objects are
dropped vertically into the sled one at a time: first
an object of mass M and then an object of mass
2M. Afterward the sled moves with speed vf .
What would be the final speed of the sled if only
the 2M object was dropped in?
a. 4vf /3
b. 3vf /2
c. vf
d. 2vf /3
e. 3vf/4
8. A new planet is discovered that has twice the
Earth's mass and half the Earth's radius. On the
surface of this new planet, a person who weighs
200 N on Earth would experience a gravitational
force of
a. 100 N
b. 200 N
c. 400 N
d. 800 N
e. 1600 N
AP PHYSICS MULTIPLE CHOICE MEDLEY
9. A rectangular wire loop is at rest in a uniform magnetic field B of magnitude 2 T that is directed out
of the page. The loop measures 5 cm by 8 cm, and
the plane of the loop is perpendicular to the field,
as shown above. The total magnetic flux through
the loop is
(A) zero (B) 2 x 10-3 T-m2 (C) 8 x 10-3 T-m2
(D) 2 x 10-1 T-m2
(E) 8 x 10-1 T-m
10. An electron is in a uniform magnetic field B that is
directed out of the plane of the page, as shown
above. When the electron is moving in the plane
of the page in the direction indicated by the arrow,
the force on the electron is directed
(A) toward the right
(B) out of the page
(C) into the page
(D) toward the top of the page
(E) toward the bottom of the page
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
B
x
spring
11.
A metal spring has its ends attached so that if
forms a circle. It is placed in a uniform magnetic
field, as shown above. Which of the following
will not cause a current to be induced in the
spring?
(A) Changing the magnitude of the magnetic field
(B) Increasing the diameter of the circle by
stretching the spring
(C) Rotating the spring about a diameter
(D) Moving the spring parallel to the magnetic
field
(E) Moving the spring in and out of the magnetic
field
12. A wheel of radius R and negligible mass is
mounted on a horizontal frictionless axle so that
the wheel is in a vertical plane. Three small
objects having masses m, M, and 2M, respectively,
are mounted on the rim of the wheel, as shown
above. If the system is in static equilibrium, what
is the value of m in terms of M ?
(A) M/2
(B) M (C) 3M/2 (D) 2M (E) 5M/2
13. A rod on a horizontal tabletop is pivoted at one
end and is free to rotate without friction about a
vertical axis, as shown above. A force F is applied
at the other end, at an angle  to the rod. If F were
to be applied perpendicular to the rod, at what
distance from the axis should it be applied in order
to produce the same torque?
(A) L sin 
(B) L cos 
(C) L
(D) L tan 
(E) 2 L
14. Which of the following imposes a limit on the
number of electrons in an energy state of an atom?
(A) The Heisenberg uncertainty principle
(B) The Pauli exclusion principle
(C) The Bohr model of the hydrogen atom
(D) The theory of relativity
(E) The law of conservation of energy
15. Which three of the glass lenses above, when
placed in air, will cause parallel rays of light to
converge?
(A) I, II, and III
(B) I, III, and V
(C) I, IV, and V
(D) II, III, and IV
(E) II, IV, and V