33. For the set-up shown of a candle and screen placed 30 cm apart, there are two locations at which a thin converging lens can be placed to produce a focused real image. One real image of the candle appears on the screen when the lens is located 12 cm from the candle. From this location, how does this lens now have to be moved in order to make the second real image of the candle appear on the screen?

 

 

34.  A wire lies in the plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

 

 

36. For the inclined plane shown, a force of 150 N applied parallel to the incline’s surface is needed to pull the object of mass M = 10.0 kg along the entire length of the incline’s surface at a constant speed. What is the actual mechanical advantage (AMA) for this scenario?

 

37. Two blocks sit on a horizontal frictionless surface connected to an ideal spring. Initially everything is at rest and there is a string compressing the mass-spring system from equilibrium. At some time after the string is cut, the block of mass 2M reaches its maximum kinetic energy K. What maximum kinetic energy does the block of mass M attain in terms of K?

 

38. For the circuit shown, the four light bulbs have identical resistance, all wires have zero resistance, and the battery is assumed to be ideal with When the switch, S, in the circuit is closed, a wire of zero resistance is added into the circuit. Which of the light bulbs will be dimmer after the switch is closed?

41. For the figure shown, the variable resistance of the outer circuit, R_outer, is decreasing at a constant rate. While this is occurring, in which direction is the magnetic field associated with the outer circuit at the point P in the plane of the circuit and in which direction is the conventional current through the resistor R_inner in the smaller interior circuit? The two circuits lie on a flat table.

 

 

 

 

46. A hollow conducting sphere in static equilibrium is isolated in deep space with a net excess charge +Q on it. What is the electric potential (assuming at the position labeled P shown in the interior of the figure? The sphere has radius r = 3a and the point of interest is at a location r = 2a from the center of the sphere at an angle of 60° with respect to the +x-axis.

 

47. A simple pendulum of length L has a point mass M released from rest from the horizontal position shown. In the absence of air resistance and friction, the mass swings through the arc of a circle. Let T represent the magnitude of the force from the string on the mass (tension), G represent the magnitude of the gravitational force acting on the mass by the earth, and F represent the magnitude of the net force acting on the mass. Which one of the following choices describes the relationship among these forces when the mass swings at the bottom of the arc (point P)?

 

49. An inverted “V” in static equilibrium is made from two uniform beams each of mass M = 12 kg. Each beam of the “V” has the same length and makes an angle of 30° with the vertical as shown in the diagram. Which one of the following choices best represents the magnitude of the static friction force acting on the left leg of the “V” from the level ground? The coefficient of static friction between each beam and the ground is µ_s = 0.76.