OC userin Physics·6 Dec 20179.50 . (a) For the thin rectangular plate shown in part (d) of Table 9.2, find the moment of inertia about an axis that lies in the plane of the plate, passes through the center of the plate, and is parallel to the axis shown. (b) Find the moment of inertia of the plate for an axis that lies in the plane of the plate, passes through the center of the plate, and is perpendicular to the axis in part (a).
OC userin Physics·8 Dec 20171.2. According to the label on a bottle of salad dressing, the volume of the contents is 0.473 liter (L). Using only the conver- sions 1 L = 1000 cm' and 1 in. = 2.54 cm, express this volume in cubic inches.
OC userin Physics·5 Dec 201751. For each pair of substances, choose the one that you expect to have the higher standard molar entropy (S) at 25°C. Explain your choices a. CO(g); CO2(g) b. CH2OH(1); CH3OH(8) c. Ar(g); CO2(g) d. CH4(g); SiH4(g) e. NO2(g); CH3CH2CH3(g) f. NaBr(s); NaBr(ag)
OC userin Physics·2 Dec 201725.23. (a) What is the resistance of a Nichrome wire at 0.0°C if its resistance is 100.00 2 at 11.5°C? (b) What is the resistance of a carbon rod at 25.8°C if its resistance is 0.0160 at 0.0°C?
OC userin Physics·4 Dec 20175.30 - Some sliding rocks approach the base of a hill with a speed of 12 m/s. The hill rises at 36° above the horizontal and has coefficients of kinetic friction and static friction of 0.45 and 0.65, respectively, with these rocks. (a) Find the acceleration of the rocks as they slide up the hill. (b) Once a rock reaches its highest point, will it stay there or slide down the hill? If it stays, show why. If it slides, find its acceleration on the way down.
OC userin Physics·2 Dec 20179.18 . In a charming 19th-century hotel, an old-style elevator is connected Figure E9.18 to a counterweight by a cable that passes over a rotating disk 2.50 m in diameter (Fig. E9.18). The elevator is raised and lowered by turning the Disk disk, and the cable does not slip on the rim of the disk but turns with it. (a) At how many rpm must the disk turn to raise the elevator at 25.0 cm/s? (b) To start the elevator moving, it must be accelerated at 8. What must be the angular acceleration of the disk, in rad/s"? (c) Through whatCounterweight angle (in radians and degrees) has the disk turned when it has raised the elevator 3.25 m between floors? Elevator
OC userin Physics·3 Dec 20171.81 .. Vector A has magnitude 12.0 m, and vector B has mag- nitude 16.0 m. The scalar product A B is 112.0 m². What is the magnitude of the vector product between these two vectors?
OC userin Physics·30 Nov 201755. Use data from Appendix IIB to calculate ASxn for each of the reactions. In each case, try to rationalize the sign of ASx a. C2H4(3) + H2(g) →→ CH68) b. C(s) + H2O(g) — CO(g) + H2(g) c. CO(g) + H2O(g) — H2() + CO2(8) d. 2 H,S(g) + 3 02(g) 2 H2O(l) + 2 SO2()
OC userin Physics·2 Dec 201733. How is the amount of current flowing through an electrolytic cell related to the amount of product produced in the redox reaction?
OC userin Physics·2 Dec 201725.25. A copper transmission cable 100 km long and 10.0 cm in diameter carries a current of 125 A. (a) What is the potential drop across the cable? (b) How much electrical energy is dissipated as thermal energy every hour?
OC userin Physics·28 Nov 2017103. Nuclei with the same number of neutrons but different mass numbers are called isotones. Write the symbols of four isotones of 236 Th.
OC userin Physics·28 Nov 201762. Calculate Ecell for each balanced redox reaction and determine if the reaction is spontaneous as written. a. O2(g) + 2 H2O(1) + 4 Ag(s) — 4OH(aq) + 4 Agt(aq) b. Br (1) + 2 (aq) — 2 Br (aq) + 12(s) c. PbO2(s) + 4H+(aq) + Sn(s) — Pb2+ (aq) + 2 H2O(l) + Sn²+ (aq)
OC userin Physics·26 Nov 2017Q5.11 In a world without friction, which of the following activi- ties could you do (or not do)? Explain your reasoning. (a) Drive around an unbanked highway curve; (b) jump into the air; (c) start walking on a horizontal sidewalk; (d) climb a vertical ladder; (e) change lanes while you drive.
OC userin Physics·26 Nov 2017Figure P5.65 5.65 ** A solid uniform 45.0-kg ball of diameter 32.0 cm is supported against a vertical, frictionless wall by a thin 30.0-cm wire of negligible mass (Fig. P5.65). (a) Draw a free-body diagram for the ball, and use the diagram to find the tension in the wire. (b) How hard does the ball push against the wall? 30.0 cm
OC userin Physics·24 Nov 201725.37 . European Light Bulb. In Europe the standard voltage in homes is 220 V instead of the 120 V used in the United States. Therefore a "100-W European bulb would be intended for use with a 220-V potential difference (see Problem 25.36). (a) If you bring a "100-W" European bulb home to the United States, what should be its U.S. power rating? (b) How much current will the 100-W European bulb draw in normal use in the United States?