PhysX #1 bugaga

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Pregunta 1 de 40

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?

Selecciona una de las siguientes respuestas posibles:

The position and velocity are both positive
The position and velocity are both negative
The position is positive, and the velocity is zero
The position is positive and the velocity is negative
The position is negative, and the velocity is positive

Explicación

Pregunta 2 de 40

Which of the following statements is not true regarding a mass- spring system that moves with simple harmonic motion in absence of friction?

Selecciona una de las siguientes respuestas posibles:

The total energy of the system remains constant
The energy of the system is continually transformed between kinetic and potential energy
The total energy of the system is proportional to the square of the amplitude
The potential energy stored in the system is greatest when the mass passes through the equilibrium position.

Explicación

Pregunta 3 de 40

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:

Selecciona una de las siguientes respuestas posibles:

ML^2/12
ML^2/6
ML^2/3
7ML^2/12
13ML^2/12

Explicación

Pregunta 4 de 40

A baseball of mass m is thrown upward with some initial speed. A gravitational force is exerted on the ball

Selecciona una de las siguientes respuestas posibles:

At all points in its motion
At all points in its motion except at the highest point
At no points in its motion
Only at downward part of its direction

Explicación

Pregunta 5 de 40

The kinetic friction will always be

Selecciona una de las siguientes respuestas posibles:

Greater than static friction
Equal to the static friction
Less than static friction
Negative

Explicación

Pregunta 6 de 40

Centripetal acceleration and tangential acceleration are always __________.

Selecciona una de las siguientes respuestas posibles:

Parallel to Each other, but in opposite direction
Perpendicular to each other
None of these
Parallel to Each other, but in the same direction

Explicación

Pregunta 7 de 40

The dimensions of angular momentum are __________.

Selecciona una de las siguientes respuestas posibles:

MLT^-1
MLT^-2
ML^2T^-2
ML^2T^-1

Explicación

Pregunta 8 de 40

Two waves have the same frequency. Which wave characteristic must also be identical for both waves?

Selecciona una de las siguientes respuestas posibles:

Phase
Amplitude
Intensity
Period

Explicación

Pregunta 9 de 40

A mechanical wave generally does NOT

Selecciona una de las siguientes respuestas posibles:

Move the medium from one place to another
Move through a medium
Move through solids
Disturb the medium

Explicación

Pregunta 10 de 40

Which statements are correct?

Selecciona una de las siguientes respuestas posibles:

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.
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.
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
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.
No correct answer

Explicación

Pregunta 11 de 40

Which statements are correct?

Selecciona una de las siguientes respuestas posibles:

Conductors are materials in which electrons move freely. Insulators are materials in which electrons do not move freely.
Insulators are materials in which electrons move freely. Conductors are materials in which electrons do not move freely.
Conductors are materials in which electrons don’t move freely. Insulators are materials in which electrons move freely.
All answers are correct
No correct answer

Explicación

Pregunta 12 de 40

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:

Selecciona una de las siguientes respuestas posibles:

Φ = EAcosθ
Φ = EAsinθ
Φ = Acosθsinθ
Φ = Ecosθ
No correct answer

Explicación

Pregunta 13 de 40

A conductor in electrostatic equilibrium has the following properties:

Selecciona una de las siguientes respuestas posibles:

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.
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.
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.
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.
No correct answer

Explicación

Pregunta 14 de 40

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:

Selecciona una de las siguientes respuestas posibles:

1
2
3
4
No correct answer

Explicación

Pregunta 15 de 40

The potential difference ΔV between points A and B in an electric field E is defined as:

Selecciona una de las siguientes respuestas posibles:

1
2
3
4
No correct answer

Explicación

Pregunta 16 de 40

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:

Selecciona una de las siguientes respuestas posibles:

ΔV = -Ed
ΔV = 0
ΔV = Ed
ΔV = -Edsinθ
No correct answer

Explicación

Pregunta 17 de 40

Which statements are correct?

Selecciona una de las siguientes respuestas posibles:

An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are perpendicular to electric field lines.
An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are parallel to electric field lines.
An equipotential surface is one on which all points are not at the same electric potential. Equipotential surfaces are perpendicular to electric field lines.
An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are perpendicular to gravitation field lines.
No correct answer

Explicación

Pregunta 18 de 40

If we define V = 0 at rA = ∞ the electric potential due to a point charge at any distance r from the charge is:

Selecciona una de las siguientes respuestas posibles:

V = kq/r
V = kq^2/r
V = kq/r^2
V = q/r
No correct answer

Explicación

Pregunta 19 de 40

The potential energy associated with a pair of point charges separated by a distance r12 is:

Selecciona una de las siguientes respuestas posibles:

1
2
3
4
No correct answer

Explicación

Pregunta 20 de 40

The electric potential due to a continuous charge distribution is:

Selecciona una de las siguientes respuestas posibles:

1
2
3
4
No correct answer

Explicación

Pregunta 21 de 40

The electric dipole moment p of an electric dipole has a magnitude:

Selecciona una de las siguientes respuestas posibles:

p = 2aQ
p = Q
p = Q^2
p = -2aQ
No correct answer

Explicación

Pregunta 22 de 40

The torque acting on an electric dipole in a uniform electric field E is:

Selecciona una de las siguientes respuestas posibles:

τ = pxE
τ = p·E
τ = p/E
τ = qpxE
No correct answer

Explicación

Pregunta 23 de 40

The potential energy of the system of an electric dipole in a uniform external electric field E is:

Selecciona una de las siguientes respuestas posibles:

U = - p·E
U = pxE
U = p·E
No correct answer
U = p/E

Explicación

Pregunta 24 de 40

The average current in a conductor is related to the motion of the charge carriers through the relationship:

Selecciona una de las siguientes respuestas posibles:

I = nqvA
I = nqv
I = qvA
I = nq/vA
No correct answer

Explicación

Pregunta 25 de 40

Ohm’s law in the differential form is:

Selecciona una de las siguientes respuestas posibles:

J = σE
I = U/R
I = R/U
J = σ/E
No correct answer

Explicación

Pregunta 26 de 40

Ohm’s law in the integral form is:

Selecciona una de las siguientes respuestas posibles:

J = σE
I = U/R
I = R/U
J = σ/E
No correct answer

Explicación

Pregunta 27 de 40

The power supplied to the element, is:

Selecciona una de las siguientes respuestas posibles:

P = IΔV
P = I/ΔV
P = I^2ΔV
P = IΔV^2
No correct answer

Explicación

Pregunta 28 de 40

The power delivered to a resistor can be defined as:

Selecciona una de las siguientes respuestas posibles:

P = I^2R
P = IR
P = IR^2
P = I^2/R
No correct answer

Explicación

Pregunta 29 de 40

Circuits involving more than one loop are conveniently analyzed with the use of Kirchhoff’s rules:

Selecciona una de las siguientes respuestas posibles:

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
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.
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.
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

Explicación

Pregunta 30 de 40

Two objects, with different sizes, masses, and temperatures, are placed in thermal contact. Energy travels

Selecciona una de las siguientes respuestas posibles:

From the larger object to the smaller object
From the object with more mass to the one with less
From the object at higher temperature to the object at lower temperature
Energy doesn’t travel
From the object at lower temperature to the object at higher temperature

Explicación

Pregunta 31 de 40

The second law of thermodynamics can be given as __________

Selecciona una de las siguientes respuestas posibles:

For any spontaneous process, the entropy of the universe increases
The entropy of a pure crystalline substance at absolute zero is zero
ΔS = Q/T at constant temperature
ΔE = Q + W

Explicación

Pregunta 32 de 40

How does the internal energy of an ideal gas change as it follows path i->f in figure?

Selecciona una de las siguientes respuestas posibles:

E(int) increases
E(int) decreases
E(int) stays the same
There is not enough information to determine how E(int) changes

Explicación

Pregunta 33 de 40

How does the internal energy of an ideal gas as it follows path f->f' along the isotherm labeled T + ΔT in figure ?

Selecciona una de las siguientes respuestas posibles:

E(int) increases
E(int) decreases
E(int) stays the same
There is not enough information to determine how E(int) changes

Explicación

Pregunta 34 de 40

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

Selecciona una de las siguientes respuestas posibles:

Twice that for container A
The same as that for container A
Half that for container A
Impossible to determine.

Explicación

Pregunta 35 de 40

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

Selecciona una de las siguientes respuestas posibles:

Twice that for container A
The same as that for container A
Half that for container A
Impossible to determine

Explicación

Pregunta 36 de 40

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

Selecciona una de las siguientes respuestas posibles:

Twice that for container A
The same as that for container A
Half that for container A
Impossible to determine

Explicación

Pregunta 37 de 40

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

Selecciona una de las siguientes respuestas posibles:

Monatomic
Diatomic
Monatomic or diatomic, depends on the conditions
Polyatomic
All answers are incorrect

Explicación

Pregunta 38 de 40

Parallel wires carrying currents I1 and I2 respectively

Selecciona una de las siguientes respuestas posibles:

Repel if they are directed opposite
Will attract if they are directed opposite
Will not interact

Explicación

Pregunta 39 de 40

A material that can be permanently magnetized is generally said to be

Selecciona una de las siguientes respuestas posibles:

Magnetic
Electromagnetic
Permanently magnetic
Ferromagnetic

Explicación

Pregunta 40 de 40

The magnetic flux around a straight currentcarrying wire

Selecciona una de las siguientes respuestas posibles:

Gets stronger with increasing distance from the wire
Is strongest near the wire
Does not vary in strength with distance from the wire
Consists of straight lines parallel to the wire

Explicación

Revisar respuesta

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	Creado por Hanzo Conard hace más de 7 años

Quiz

PhysX #1 bugaga

Pregunta 1 de 40

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?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 2 de 40

Which of the following statements is not true regarding a mass- spring system that moves with simple harmonic motion in absence of friction?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 3 de 40

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:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 4 de 40

A baseball of mass m is thrown upward with some initial speed. A gravitational force is exerted on the ball

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 5 de 40

The kinetic friction will always be

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 6 de 40

Centripetal acceleration and tangential acceleration are always __________.

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 7 de 40

The dimensions of angular momentum are __________.

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 8 de 40

Two waves have the same frequency. Which wave characteristic must also be identical for both waves?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 9 de 40

A mechanical wave generally does NOT

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 10 de 40

Which statements are correct?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 11 de 40

Which statements are correct?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 12 de 40

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:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 13 de 40

A conductor in electrostatic equilibrium has the following properties:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 14 de 40

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:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 15 de 40

The potential difference ΔV between points A and B in an electric field E is defined as:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 16 de 40

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:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 17 de 40

Which statements are correct?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 18 de 40

If we define V = 0 at rA = ∞ the electric potential due to a point charge at any distance r from the charge is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 19 de 40

The potential energy associated with a pair of point charges separated by a distance r12 is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 20 de 40

The electric potential due to a continuous charge distribution is:

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?