OC userin Physics·2 Nov 201731.3. The voltage across the terminals of an ac power supply varies with time according to Eq. (31.1). The voltage amplitude is V = 45.0 V. What are (a) the root-mean-square potential differ- ence Vrms and (b) the average potential difference Vay between the two terminals of the power supply?
OC userin Physics·31 Oct 201742. Given the values of AHxn, ASxn, and T, determine ASunty and predict whether or not each reaction is spontaneous. (Assume that all reactants and products are in their standard states.) a. AHix = -95 kJ; ASix = -157J/K; T = 298 K b. AHix = -95 kJ; ASix = -157J/K; T = 855 K C. AHxn = +95 kJ; ASix = -157J/K; T = 298 K d. AHX = -95 kJ; ASXn = +157J/K; T = 398 K
OC userin Physics·31 Oct 201797. The ratio of oxygen to carbon by mass in carbon monoxide is 1.33:1.00. Find the formula of an oxide of carbon in which the ratio by mass of oxygen to carbon is 2.00:1.00.
OC userin Physics·29 Oct 201711.30. A vertical, solid steel post 25 cm in diameter and 2.50 m long is required to support a load of 8000 kg. You can ignore the weight of the post. What are (a) the stress in the post; (b) the strain in the post; and (c) the change in the post's length when the load is applied?
OC userin Physics·30 Oct 2017Q1.23 Consider the vector products AX (BXC) and (AXB) Xč. Give an example that illustrates the general rule that these two vector products do not have the same magnitude or direction. Can you choose vectors A, B, and such that these two vector products are equal? If so, give an example.
OC userin Physics·30 Oct 201731.25 . A series ac circuit contains a 250-22 resistor, a 15-mH inductor, a 3.5-F capacitor, and an ac power source of voltage amplitude 45 V operating at an angular frequency of 360 rad/S. (a) What is the power factor of this circuit? (b) Find the average power delivered to the entire circuit. (c) What is the average power delivered to the resistor, to the capacitor, and to the inductor?
OC userin Physics·28 Oct 201725.45 A 25.0-2 bulb is connected across the terminals of a 12.0-V battery having 3.50 2 of internal resistance. What per- centage of the power of the battery is dissipated across the internal resistance and hence is not available to the bulb?
OC userin Physics·27 Oct 201770. Calculate the equilibrium constant for the reaction between Fe2+(aq) and Zn(s) (at 25 °C).
OC userin Physics·26 Oct 201796. The ratio of sulfur to oxygen by mass in SO2 is 1.0:1.0. a. Find the ratio of sulfur to oxygen by mass in SO3. b. Find the ratio of sulfur to oxygen by mass in S.O.