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?
OC userin Physics·24 Nov 2017Q5.12 When you stand with bare feet in a wet bathtub, the grip feels fairly secure, and yet a catastrophic slip is quite possible. Explain this in terms of the two coefficients of friction.
OC userin Physics·24 Nov 20171.17 .. BIO A rather ordinary middle-aged man is in the hospi- tal for a routine checkup. The nurse writes "200" on the patient's medical chart but forgets to include the units. Which of these quantities could the 200 plausibly represent? The patient's (a) mass in kilograms; (b) height in meters; (c) height in centime- ters; (d) height in millimeters; (e) age in months.
OC userin Physics·24 Nov 201711.36 A square steel plate is 10.0 cm on a side and 0.500 cm thick. (a) Find the shear strain that results if a force of magnitude 9.0 X 10 N is applied to each of the four sides, parallel to the side. (b) Find the displacement x Figure E11.37 ficure FL in centimeters.
OC userin Physics·22 Nov 20172.49 . You throw a small rock straight up from the edge of a highway bridge that crosses a river. The rock passes you on its way down, 6.00 s after it was thrown. What is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? Ignore air resistance.
OC userin Physics·19 Nov 201769. Calculate the equilibrium constant for the reaction between Ni2+ (aq) and Cd(s) (at 25 °C).
OC userin Physics·21 Nov 201725.39. Consider the circuit of Fig. E25.30. (a) What is the total rate at which electrical energy is dissipated in the 5.0-1 and 9.0-12 resistors? (b) What is the power output of the 16.0-V battery? (c) At whatrate is electrical energy being converted to other forms in the 8.0-V battery? (d) Show that the power output of the 16.0-V battery equals the overall rate of consumption of electrical energy in the rest of the circuit.
OC userin Physics·21 Nov 20171.58. Two ropes in a vertical plane exert equal-magnitude forces on a hanging weight but pull with an angle of 72.0° be- tween them. What pull does each rope exert if their resultant pull is 372 N directly upward?
OC userin Physics·20 Nov 20175.23 . CP CALC A 2.00-kg box is moving to the right with speed 9.00 m/s on a horizontal, frictionless surface. At t = 0 a horizontal force is applied to the box. The force is directed to the left and has magnitude Ft) = (6.00 N/s?)t2. (a) What distance does the box move from its position at t = 0 before its speed is reduced to zero? (b) If the force continues to be applied, what is the speed of the box at t = 3.00 s?
OC userin Physics·19 Nov 201763. Which metal cation is the best oxidizing agent? a. Pb2+ b. Cr3+ c. Fe2+ d. Sn2+
OC userin Physics·18 Nov 20175.35 CP Stopping Distance. (a) If the coefficient of kinetic friction between tires and dry pavement is 0.80, what is the short- est distance in which you can stop a car by locking the brakes when the car is traveling at 28.7 m/s (about 65 mi/h)? (b) On wet pavement the coefficient of kinetic friction may be only 0.25. How fast should you drive on wet pavement to be able to stop in the same distance as in part (a)? (Note: Locking the brakes is not the safest way to stop.)
OC userin Physics·18 Nov 2017Q8.4 A car has the same kinetic energy when it is traveling south at 30 m/s as when it is traveling northwest at 30 m/s. Is the mo- mentum of the car the same in both cases? Explain.
OC userin Physics·17 Nov 20179.1. (a) What angle in radians is subtended by an are 1.50 m long on the circumference of a circle of radius 2.50 m? What is this angle in degrees? (b) An arc 14.0 cm long on the circumference of a circle subtends an angle of 128°. What is the radius of the circle? (c) The angle between two radii of a circle with radius 1.50 m is 0.700 rad. What length of arc is intercepted on the circumference of the circle by the two radii?
OC userin Physics·14 Nov 20175.58 - A bowling ball weighing 71.2 N (16.0 lb) is attached to the ceiling by a 3.80-m rope. The ball is pulled to one side and released; it then swings back and forth as a pendulum. As the rope swings through the vertical, the speed of the bowling ball is 4.20 m/s. At this instant, what are (a) the acceleration of the bowling ball, in magnitude and direction, and (b) the tension in the rope?
OC userin Physics·14 Nov 20175.14. Three sleds are being pulled horizontally on frictionless horizontal ice using horizontal ropes (Fig. E5.14). The pull is of magnitude 190 N. Find (a) the acceleration of the system and (b) the tension in ropes A and B. Figure E5.14 30.0 kg 20.0 kg 10.0 kg Pull