The process whereby heat flows by means of molecular collisions is referred to as
A) conduction.
B) convection.
C) radiation.
D) inversion.
E) evaporation.
The L = 4 orbital number admits how many “orientations” of the orbital angular
momentum vector?
A) 8
B) 1
C) 5
D) 4
E) 9
A 3300. kg auto tows a 4500. kg horse trailer. If the engine causes the ground to push
the car forward with 8.58 kN:
(a) What is the acceleration of the horse trailer?
(b) What is the forward force on the trailer?
(c) With how much force does the trailer pull back on the car?
The decibel level of sound is related to its
A) wavelength.
B) intensity.
C) velocity.
D) frequency.
E) pitch.
What is the result of 1.58 x 3.793?
A) 4.1656 x 10-1
B) 4.166 x 10-1
C) 4.17 x 10-1
D) 4.2 x 10-1
E) 4 x 10-1
When a wave obliquely crosses a boundary into another medium, it is
A) refracted.
B) diffracted.
C) reflected.
D) always slowed down.
E) always speeded up.
Only odd harmonics can be produced in a(n) ________ organ pipe.
A) closed
B) narrow
C) open
D) wide
For an electron moving in a direction opposite to the electric field
A) its potential energy increases and its electric potential decreases.
B) its potential energy decreases and its electric potential increases.
C) its potential energy increases and its electric potential increases.
D) its potential energy decreases and its electric potential decreases.
E) both its potential energy and it electric potential remain constant.
Misty throws a stone horizontally from the roof edge of a 50. meter high dormitory. It
hits the ground at a point 60. m from the building.
(a) Determine the horizontal component of velocity just before hitting the ground.
(b) What vertical speed did it have just before hitting the ground?
FIGURE 7-4
James is twirling a rock around a horizontal circle on the end of a string. Fig. 7-4 is a
top view (motion is counterclockwise). If the speed is constant what is the acceleration
at point A?
A) zero
B) rv2
C) centripetal
D) centrifugal
E) v / r
A generator coil rotates through one revolution 60 times each second. The frequency of
the emf is
A) 120 Hz.
B) 60 Hz.
C) 60 Hz.
D) 30 Hz.
E) (60/ ) Hz.
The tail of a comet is primarily caused by
A) radiation pressure.
B) electromagnetic induction.
C) Coulomb repulsion.
D) eddy currents.
E) nuclear magnetism.
When a neutron is emitted from an unstable nucleus, the atomic mass number of the
nucleus
A) does not change.
B) decreases by 2.
C) decreases by 1.
D) increases by 2.
E) increases by 1.
You are standing in a moving bus, and you suddenly fall backward. You can imply from
this that the bus’s
A) velocity increased.
B) speed remained the same, but it’s turning to the left.
C) velocity decreased.
D) speed remained the same, but it’s turning to the right.
E) the bus stopped.
An ice skater has a moment of inertia of 5.0 kg∙m2 when her arms are outstretched. At
this time she is spinning at 3.0 revolutions per second (rps). If she pulls in her arms and
decreases her moment of inertia to 2.0 kg∙m2, how fast will she be spinning?
A) 2.0 rps
B) 3.3 rps
C) 7.5 rps
D) 8.4 rps
E) 10 rps
A certain engine extracts 1300 J of heat from a hot temperature reservoir and discharges
700 J of heat to a cold temperature reservoir. What is the efficiency of this engine?
A) 46%
B) 54%
C) 86%
D) 27%
E) 13%
The temperature of an ideal gas increases from 10°C to 300. K while remaining at
constant pressure. What happens to the volume of the gas?
A) It increases by factor of 30.
B) It decreases slightly.
C) It decreases to one-half its original volume.
D) It more than doubles.
E) It increases slightly.
Which of the following speeds is greatest?
A) 10 km/h
B) 10 m/s
C) 10 ft/s
D) 10 mi/h
E) 10 yards/s
An object is thrown upwards with a speed of 14 m/s. How high above the projection
point is it after 0.50 s?
A) 0 m
B) 5.8 m
C) 7.0 m
D) 8.2 m
E) 10 m
In a double-slit experiment, it is observed that the distance between adjacent maxima on
a remote screen is 1 cm. What happens to the distance between adjacent maxima when
the slit separation is cut in half?
A) It increases to 2 cm.
B) It increases to 4 cm.
C) It decreases to 0.5 cm.
D) It decreases to 0.25 cm.
A right isosceles triangle is cut out from a piece of sheet metal. The two equal sides are
1.0 m long each. How far is the center of gravity from the right angle (90.) vertex of the
triangle?
A) 0.71 m
B) 0.55 m
C) 0.47 m
D) 0.24 m
E) 0.35 m
Which of the following is a microsecond?
A) 109s
B) 106s
C) 1000 s
D) 10-9s
E) 10-6s
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The
current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is
parallel to the magnetic field?
A) zero
B) 0.41 m∙N
C) 0.47 m∙N
D) 0.52 m∙N
E) 0.59 m∙N
Express 45°C in °F.
A) 81°F
B) 25°F
C) 57°F
D) 113°F
E) 127°F
Increasing the spring constant k of a mass-and-spring system causes what kind of
change in the resonant frequency of the system? (Assume no change in the system’s
mass m.)
A) The frequency increases.
B) The frequency decreases.
C) There is no change in the frequency.
D) The frequency increases if the ratio k/m is greater than or equal to 1 and decreases if
the ratio k/m is less than 1.
E) The frequency increases if the ratio k/m is less than or equal to 1 and decreases if the
ratio k/m is greater than 1.
Electric field lines
A) are closer together the stronger the field.
B) start on negative charges and end on positive charges.
C) were invented by Isaac Newton.
D) are perpendicular to the lines of force.
E) were discovered by Franklin.
How many molecules are in:
(a) 1.0 cm3 of AIR at STP?
(b) 1.0 cm3 of HELIUM at STP?
The slope of a tangent line at a given time value on a position versus time graph gives
A) instantaneous velocity.
B) average velocity.
C) instantaneous acceleration.
D) average acceleration
E) none of the given answers.
FIGURE 30-1
The Feynman diagram in Fig. 30-1 shows two electrons approaching each other,
interacting, then leaving each other. What particle is being exchanged during the
interaction?
A) neutrino
B) virtual photon
C) pion
D) W particle
A 3 kg mass is positioned at (0, 8), and a 1 kg mass is positioned at (12, 0). What are
the coordinates of a 4 kg mass which will result in the center of mass of the system of
three masses being located at the origin (0, 0)?
A) (-3, -6)
B) (-6, -3)
C) (3, 6)
D) (-12, -8)
The work done by the gas is negative for an
A) isothermal compression.
B) adiabatic expansion.
C) isothermal expansion.
D) isometric process.
A vector has components Ax = 12.0 m andAy = 5.00 m. What is the angle that vector
makes with the x-axis?
A) 12.6
B) 22.6
C) 32.6
D) 6.6
E) 42.8
A Carnot cycle consists of
A) two adiabats and two isobars.
B) two isobars and two isotherms.
C) two adiabats and two isotherms.
D) two isotherms and two isomets.
E) four adiabats.