7439773
Descripción
Test por Hanzo Conard, actualizado hace más de 1 año
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Creado por Hanzo Conard
hace más de 7 años
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Pregunta 1
Pregunta
Consider a graphical representation (Fig.) of simple harmonic motion as described mathematically by equation. When the particle is at point A on the graph, what can you say about its position and
velocity?
Respuesta
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The position and velocity are both positive
-
The position and velocity are both negative
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The position is positive, and the velocity is zero
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The position is positive and the velocity is negative
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The position is negative, and the velocity is positive
Pregunta 2
Pregunta
Which of the following statements is not true regarding a mass- spring system that moves with simple harmonic motion in absence of friction?
Respuesta
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The total energy of the system remains constant
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The energy of the system is continually transformed between kinetic and potential energy
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The total energy of the system is proportional to the square of the amplitude
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The potential energy stored in the system is greatest when the mass passes through the equilibrium position.
Pregunta 3
Pregunta
When a thin uniform stick of mass M and length L is pivoted about its midpoint, its rotational inertia is ML^2/12. When pivoted about a parallel axis through one end, its rotational inertia is:
Respuesta
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ML^2/12
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ML^2/6
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ML^2/3
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7ML^2/12
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13ML^2/12
Pregunta 4
Pregunta
A baseball of mass m is thrown upward with some initial speed. A gravitational force is exerted on the ball
Respuesta
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At all points in its motion
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At all points in its motion except at the highest point
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At no points in its motion
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Only at downward part of its direction
Pregunta 5
Pregunta
The kinetic friction will always be
Respuesta
-
Greater than static friction
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Equal to the static friction
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Less than static friction
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Negative
Pregunta 6
Pregunta
Centripetal acceleration and tangential acceleration are always __________.
Respuesta
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Parallel to Each other, but in opposite direction
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Perpendicular to each other
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None of these
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Parallel to Each other, but in the same direction
Pregunta 7
Pregunta
The dimensions of angular momentum are __________.
Respuesta
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MLT^-1
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MLT^-2
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ML^2T^-2
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ML^2T^-1
Pregunta 8
Pregunta
Two waves have the same frequency. Which wave characteristic must also be identical for both waves?
Respuesta
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Phase
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Amplitude
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Intensity
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Period
Pregunta 9
Pregunta
A mechanical wave generally does NOT
Respuesta
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Move the medium from one place to another
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Move through a medium
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Move through solids
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Disturb the medium
Pregunta 10
Pregunta
Which statements are correct?
Respuesta
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Charges of opposite sign attract one another and charges of the same sign repel one another. Total charge in an isolated system is conserved. Charge is quantized.
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Charges of opposite sign repel one another and charges of the same sign attract one another.Total charge in an isolated system is conserved. Charge is quantized.
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Charges of opposite sign attract one another and charges of the same sign repel one another. Total charge in an isolated system is not conserved. Charge is quantized
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Charges of opposite sign repel one another and charges of the same sign attract one another. Total charge in an isolated system is ot conserved. Charge is not quantized.
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No correct answer
Pregunta 11
Pregunta
Which statements are correct?
Respuesta
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Conductors are materials in which electrons move freely. Insulators are materials in which electrons do not move freely.
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Insulators are materials in which electrons move freely. Conductors are materials in which electrons do not move freely.
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Conductors are materials in which electrons don’t move freely. Insulators are materials in which electrons move freely.
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All answers are correct
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No correct answer
Pregunta 12
Pregunta
If the electric field is uniform and makes an angle θ with the normal to a surface of area A, the electric flux through the surface is:
Respuesta
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Φ = EAcosθ
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Φ = EAsinθ
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Φ = Acosθsinθ
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Φ = Ecosθ
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No correct answer
Pregunta 13
Pregunta
A conductor in electrostatic equilibrium has the following properties:
Respuesta
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1) The electric field is zero everywhere inside the conductor. 2) Any net charge on the conductor resides entirely on its surface. 3) The electric field just outside the conductor is perpendicular to its surface and has a magnitude σ/ε0, where σ is the surface charge density at that point. 4) On an irregularly shaped conductor, the surface charge density is greatest where the radius of curvature of the surface is the smallest.
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1) The electric field is zero everywhere inside the conductor. 2) Any net charge on the conductor resides partially on its surface, partially inside the conductor. 3) The electric field just outside the conductor is parallel to its surface and has a magnitude σ/ε0, where σ is the surface charge density at that point. 4) On an irregularly shaped conductor, the surface charge density is greatest where the radius of curvature of the surface is the smallest.
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1) The electric field is non zero everywhere inside the conductor. 2) Any net charge on the conductor resides entirely on its surface. 3) The electric field just outside the conductor is perpendicular to its surface and has a magnitude σ/ε0, where σ is the surface charge density at that point. 4) On an irregularly shaped conductor, the surface charge density is greatest where the radius of curvature of the surface is the biggest.
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1) The electric field is zero everywhere inside the conductor. 2) Any net charge on the conductor resides entirely inside the conductor. 3) The electric field just outside the conductor is perpendicular to its surface and has a magnitude σ/ε0, where σ is the surface charge density at that point. 4) On an irregularly shaped conductor, the surface charge density is smallest where the radius of curvature of the surface is the smallest.
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No correct answer
Pregunta 14
Pregunta
When a positive test charge q0 is moved between points A and B in an electric field E, the change in the potential energy of the charge–field system is:
Respuesta
-
1
-
2
-
3
-
4
-
No correct answer
Pregunta 15
Pregunta
The potential difference ΔV between points A and B in an electric field E is defined as:
Respuesta
-
1
-
2
-
3
-
4
-
No correct answer
Pregunta 16
Pregunta
The potential difference between two points A and B in a uniform electric field E, where s (d=|s|) is a vector that points from A to B and is parallel to E is:
Respuesta
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ΔV = -Ed
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ΔV = 0
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ΔV = Ed
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ΔV = -Edsinθ
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No correct answer
Pregunta 17
Pregunta
Which statements are correct?
Respuesta
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An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are perpendicular to electric field lines.
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An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are parallel to electric field lines.
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An equipotential surface is one on which all points are not at the same electric potential. Equipotential surfaces are perpendicular to electric field lines.
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An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are perpendicular to gravitation field lines.
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No correct answer
Pregunta 18
Pregunta
If we define V = 0 at rA = ∞ the electric potential due to a point charge at any distance r from the charge is:
Respuesta
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V = kq/r
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V = kq^2/r
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V = kq/r^2
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V = q/r
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No correct answer
Pregunta 19
Pregunta
The potential energy associated with a pair of point charges separated by a distance r12 is:
Respuesta
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1
-
2
-
3
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4
-
No correct answer
Pregunta 20
Pregunta
The electric potential due to a continuous charge distribution is:
Respuesta
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1
-
2
-
3
-
4
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No correct answer
Pregunta 21
Pregunta
The electric dipole moment p of an electric dipole has a magnitude:
Respuesta
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p = 2aQ
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p = Q
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p = Q^2
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p = -2aQ
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No correct answer
Pregunta 22
Pregunta
The torque acting on an electric dipole in a uniform electric field E is:
Respuesta
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τ = pxE
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τ = p·E
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τ = p/E
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τ = qpxE
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No correct answer
Pregunta 23
Pregunta
The potential energy of the system of an electric dipole in a uniform external electric field E is:
Respuesta
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U = - p·E
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U = pxE
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U = p·E
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No correct answer
-
U = p/E
Pregunta 24
Pregunta
The average current in a conductor is related to the motion of the charge carriers through the relationship:
Respuesta
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I = nqvA
-
I = nqv
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I = qvA
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I = nq/vA
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No correct answer
Pregunta 25
Pregunta
Ohm’s law in the differential form is:
Respuesta
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J = σE
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I = U/R
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I = R/U
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J = σ/E
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No correct answer
Pregunta 26
Pregunta
Ohm’s law in the integral form is:
Respuesta
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J = σE
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I = U/R
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I = R/U
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J = σ/E
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No correct answer
Pregunta 27
Pregunta
The power supplied to the element, is:
Respuesta
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P = IΔV
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P = I/ΔV
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P = I^2ΔV
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P = IΔV^2
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No correct answer
Pregunta 28
Pregunta
The power delivered to a resistor can be defined as:
Respuesta
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P = I^2R
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P = IR
-
P = IR^2
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P = I^2/R
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No correct answer
Pregunta 29
Pregunta
Circuits involving more than one loop are conveniently analyzed with the use of Kirchhoff’s rules:
Respuesta
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1) The sum of the currents entering any junction in an electric circuit must equal the sum of the currents leaving that junction. 2) The sum of the potential differences across all elements around any circuit loop must be zero
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1) The product of the currents entering any junction in an electric circuit must equal the sum of the currents leaving that junction. 2) The sum of the potential differences across all elements around any circuit loop must be constant.
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1) The sum of the currents at any circuit loop must be zero. 2) The sum of the potential differences across all elements around any circuit loop must be zero.
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1) The sum of the currents entering any junction in an electric circuit must equal the sum of the currents leaving that junction. 2) The product of the potential differences across all elements around any circuit loop must be zero.
-
No correct answer
Pregunta 30
Pregunta
Two objects, with different sizes, masses, and temperatures, are placed in thermal contact. Energy travels
Respuesta
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From the larger object to the smaller object
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From the object with more mass to the one with less
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From the object at higher temperature to the object at lower temperature
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Energy doesn’t travel
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From the object at lower temperature to the object at higher temperature
Pregunta 31
Pregunta
The second law of thermodynamics can be given as __________
Respuesta
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For any spontaneous process, the entropy of the universe increases
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The entropy of a pure crystalline substance at absolute zero is zero
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ΔS = Q/T at constant temperature
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ΔE = Q + W
Pregunta 32
Pregunta
How does the internal energy of an ideal gas change as it follows path i->f in figure?
Respuesta
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E(int) increases
-
E(int) decreases
-
E(int) stays the same
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There is not enough information to determine how E(int) changes
Pregunta 33
Pregunta
How does the internal energy of an ideal gas as it follows path f->f' along the isotherm labeled T + ΔT in figure ?
Respuesta
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E(int) increases
-
E(int) decreases
-
E(int) stays the same
-
There is not enough information to determine how E(int) changes
Pregunta 34
Pregunta
Two containers hold an ideal gas at the same temperature and pressure. Both containers hold the same type of gas but container B has twice the volume of container A. The average translational kinetic energy per molecule in container B is
Respuesta
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Twice that for container A
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The same as that for container A
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Half that for container A
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Impossible to determine.
Pregunta 35
Pregunta
Two containers hold an ideal gas at the same temperature and pressure. Both containers hold the same type of gas but container B has twice the volume of container A. The internal energy of the gas in container B is
Respuesta
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Twice that for container A
-
The same as that for container A
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Half that for container A
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Impossible to determine
Pregunta 36
Pregunta
Two containers hold an ideal gas at the same temperature and pressure. Both containers hold the same type of gas but container B has twice the volume of container A. The rms speed of the gas molecules in container B is
Respuesta
-
Twice that for container A
-
The same as that for container A
-
Half that for container A
-
Impossible to determine
Pregunta 37
Pregunta
The molar specific heat of a gas is measured at constant volume and found to be 11R/2. The gas is most likely to be
Respuesta
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Monatomic
-
Diatomic
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Monatomic or diatomic, depends on the conditions
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Polyatomic
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All answers are incorrect
Pregunta 38
Pregunta
Parallel wires carrying currents I1 and I2 respectively
Respuesta
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Repel if they are directed opposite
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Will attract if they are directed opposite
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Will not interact
Pregunta 39
Pregunta
A material that can be permanently magnetized is generally said to be
Respuesta
-
Magnetic
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Electromagnetic
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Permanently magnetic
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Ferromagnetic
Pregunta 40
Pregunta
The magnetic flux around a straight currentcarrying wire
Respuesta
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Gets stronger with increasing distance from the wire
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Is strongest near the wire
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Does not vary in strength with distance from the wire
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Consists of straight lines parallel to the wire
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