Physics Electrostatics Level: University
A uniform electric field of 2 x 10^5 N/C parallel to the positive z axis fills all of space compute the electric flux through a rectangle of 4.8m^2 if the rectangle is placed (a) in the xyplane (b) in the yz plane (c) the plane makes an angle of 30 degrees with the y axis of the origin.
Physics Electrostatics Level: University
A rod 80 cm long is charged with a charge density of 40 micro C/m. A charge of 20 micro C is placed 80 cm from the midpoint of the rod and along a line perpendicular to it. Calculate the electric field at a point midway between the point charge and the center of the rod.
Physics Heat & Thermodynamics Level: University
Heat Energy TransferA single food calorie is enough energy to raise 1.0kg how high?
a. 43 cm
b. 72 cm
c. 0.43 km
d. 0.72 km
Physics Current Electricity Level: University
Which one of the following situations results in a conventional electric current that flows westward?a. A bean of protons moves eastward.
b. An electric dipole moves westward.
c. A beam of electrons moves westward.
d. Abeam of electrons moves eastward.
e. A beam of neutral atoms moves westward.
Physics Electrostatics Level: University
The effective area of each of each plate of a parallel plate capacitor is 2.4m^2. The capacitor is filled with neoprene rubber( k = 6.4). When a 3.0V potential difference exists across the plates of the capacitor the capacitor stores 5.0uC of charge. Determine the plate separation of the capacitor.a. 7.2 x 10 ^ - 5 m
b. 3.0 x 10 ^ - 4 m
c. 1.7 x 10 ^ - 4 m
d. 5.3 x 10 ^ - 4 m
e. 8.2 x 10 ^ - 5 m
Physics Electrostatics Level: University
The magnitude of the charge on the plates of an isolated parallel plate capacitor is doubled. Which one of the following statements is true concerning the capacitance of this parallel-plate system?
a. The capacitance is decreased to one half of its original value.
b. The capacitance is increased to twice it original value.
c. The capacitance remain unchanged
d. The capacitance depends the electric field between the plates.
e. The capacitance depends on the potential difference across the plates
Physics Electrostatics Level: University
Which one of the following statements concerning electrostatic situations is false?a. E is zero everywhere inside a conductor
b. Equipotential surfaces are always perpendicular to E
c.It takes zero work to move a charge along an equipotential surface
d. If V is constant throughout a region of space then E must be zero in that region
e. No force component acts along the path of a charge as it moved along the equipotential surface.
Physics Electrostatics Level: University
If an electron which has a charge of 1.60 X 10^-19 C is moved from rest at A to rest at B what is the change in electric potential energy of the electron?a. +4.3 X 10^-15J
b. +5.4 X 10^-15J
c. -2.1 X 10^-14J
d. -3.2 X 10^-14J
e. zero joules
Physics Dimensions Level: University
Motion in one DimensionA tennis ball is shot vertically upward from the surface of an atmosphere-free planet with an initial speed of 20.0 m/s. One second later the ball has an instantaneous velocity in the upward direction of 15.0 m/s. What is the magnitude of the acceleration due to gravity on the surface of this planet?
a. 5.0 m/s2
b. 9.8 m/s2
c. 12 m/s2
d. 15m/s2
e. 24 m/s2
Physics Dimensions Level: University
Motion in one DimensionStarting from rest a particle which is confined to move along a straight line is accelerated at a rate of 5.0 m/s2. Which statement concerning the slope of the position versus time graph for this particle is true?
a. The slope has a constant value of 5.0 m/s.
b. The slope has a constant value of 5.0 m/s2.
c. The slope is both constant and negative.
d. The slope is not constant and increases with increasing time
e. The slope is not constant and decreases with increasing time
Physics Dimensions Level: University
Motion in one dimensionBall A is dropped from rest from a window. At the same instant, ball B is thrown downward and ball C is thrown upward from the same window. Which statement concerning the balls is necessarily true if air resistance is neglected?
a. At some instant after it is thrown the acceleration of ball C is zero.
b. All three balls strike the ground at the same time.
c. All three balls have the same velocity at any instant.
d. All three balls have the same acceleration at any instant.
e. All three balls reach the ground with the same velocity
Physics Dimensions Level: University
Motion in one DimensionWhich one of the following situations is not possible?
a. A body has zero velocity and non-zero acceleration.
b. A body travels with a northward velocity and a northward acceleration.
c. A body travels with a northward velocity and a southward acceleration.
d. A body travels with a constant velocity and a time- varying acceleration.
e. A body travels with a constant acceleration and a time- varying velocity.
Physics Dimensions Level: University
Equation of MotionAn elevator is moving upward with a speed of 11 m/s. Three seconds later the elevator is still moving upward but its speed has been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval?
a. 2.0 m/ s2 downward
b. 2.0 m/s2 upward
c. 5.3 m/s2 downward
d. 5.3 m/ s2 upward
e. 2.7 m/ s2 downward
Physics Dimensions Level: University
A racecar traveling at constant speed makes one lap around a circular track of radius r in a time t [ NOTE: the circumference of a circle is given by C = 2 pai r]. Determine the magnitude of the average velocity of the car one complete lap.a. r/t
b. 2r/t
c. pai / t
d. 2 pai r / t
e. zero m / s
Physics Dimensions Level: University
One DimensionFor which one of the following situations will the path length equal the magnitude of the displacement?
a. A jogger is running around a circular path.
b. A ball is rolling down an inclined plane.
c. A train travels 5 miles east and then it stops and travels 2 miles west.
d. ball rises and falls after being thrown up from the earth s surface.
e. A ball on the end of a string is moving in a vertical circle.
