A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. The plates are pulled apart to a separation 2d while the capacitor remains connected to the battery. After the plates are 2d apart, the capacitance of the capacitor and the magnitude of the charge on the plates are what?
A.
C0, 
Q0B.
C0, Q0C.
D.
E.
Answer: A
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To reduce the weight of an automobile it is decided to redesign the arm that controls the steering of the front wheels. The present control arm is made of oil quenched and tempered 1040 steel, and the maximum design force creates a stress that is 50 percent of the metal yield stress. It proposed to change to a low alloy steel of higher strength, and the new design is to be 50 percent of the yield stress. It is also determined that the new steel must have at least 15 percent ductility to provide sufficient resistance to fracture. The present control arm is 1.0 cm. in radius and 30 cm. long. The maximum tensile force expected on the control arm is 7.85 × 104 N. Of the low alloy steels presented in this chapter, what steel that meets the design requirements and provides the greatest weight
reduction. (a) What is the new arm radius? (b) What weight reduction is provided by this new steel?
The star Algol is
a. an astrometric binary. b. a spectroscopic binary. c. a visual binary. d. an eclipsing binary. e. a spectroscopic binary and an eclipsing binary.
Resolution: A camera used for aerial mapping has a lens with a 30-cm diameter maximum aperture and a 42-cm focal length. Light of 550 nm wavelength is used to form the image. Assuming that the resolution of the camera is limited only by diffraction, what is the smallest angle (in milliradians) subtended by an object on the ground that can be resolved by this camera at maximum aperture?
A. 1.6 mrad B. 2.2 mrad C. 3.2 mrad D. 4.5 mrad E. 6.3 mrad
Figure C9.12 shows the potential energy function for a certain interaction between two objects. As their separation r increases, the magnitude of the force each exerts on the other (A) increases or (B) decreases.
A. Increases. B. Decreases.