Physics B Questions & Answers

Physics B Questions & Answers _______ is a line in which waves that are moving together are all in the same phase. - CORRECT ANSWER- wave front A 12-inch object is placed 30 inches in front of a plane mirror. A ray of light from the object strikes the mirror at a 45-degree angle. how tall is the image produced - CORRECT ANSWER12 inches A 14 cm object is 20 cm from a concave lens that has a focal length of -10 cm. The distance of the image from the lens, rounded to the nearest tenth, is - CORRECT ANSWER- -6.7cm A 15.0 cm object is 12.0 cm from a concave mirror that has a focal length of 4.8 cm. Its image is 8.0 cm in front of the mirror. - CORRECT ANSWERA 4.0 cm object is 6.0 cm from a convex mirror that has a focal length of 8.0 cm. What is the distance of the image from the mirror? - CORRECT ANSWER- -24 cm A 60-g sample of radioactive isotope is measured after two half-lives have passed. What pair of percentages describes the sample after two half-lives? - CORRECT ANSWER- 25% unchanged and 75% stable A ceiling fan draws a current of 0.625 A and has a voltage of 120 V. The resistance of the ceiling fan, to the nearest whole number, is - CORRECT ANSWER- 192 A charge is moving in a magnetic field that points to the left. - CORRECT ANSWER- left, right A charge of +0.08 C moves to the right due to a 4 N force exerted by an electric field. What is the magnitude and direction of the electric field? - CORRECT ANSWER- 50 n/c right A charge of +0.08 C moves to the right due to a 4 N force exerted by an electric field. What is the magnitude and direction of the electric field? - CORRECT ANSWER- 50 N/C right A charge of 40 µC is pushed by a force of 15 µN a distance of 1.3 mm in an electric field. what is the electric potential difference. - CORRECT ANSWER- 4.9 × 10-4 V A charge of 6.4 × 10-7 C experiences an electric force of 1.8 × 10-1 N. What is the electric field strength? - CORRECT ANSWER- 2.8 × 105 N/C A charge of 8.5 × 10-6 C is in an electric field that has a strength of 3.2 × 105 N/C. What is the electric force acting on the charge? - CORRECT ANSWER- 2.7n A charged particle moves at 2.5 × 104 m/s at an angle of 25° to a magnetic field that has a field strength of 8.1 × 10-2 T. If the magnetic force is 7.5 × 10-2 N, what is the magnitude of the charge? - CORRECT ANSWER- 8.8 × 10-5 C A circuit carries a current of 0.64 A when there is a resistance of 50.0 Ω. The voltage applied to the circuit, to the nearest whole number, is - CORRECT ANSWER- 32 v A circuit featuring multiple paths through which current can flow is best classified into which category? - CORRECT ANSWER- a parallel circuit A circuit has a current of 3.6 A and a resistance of 5.0 Ω. What is the voltage applied to the circuit? - CORRECT ANSWER- 18 v A circuit has a resistance of 2.5 Ω and is powered by a 12.0 V battery. The current in the circuit, to the nearest tenth, is - CORRECT ANSWER- 4.8 A A circuit is built based on the circuit diagram shown. What is the current in the 50 Ω resistor? - CORRECT ANSWER- 1.2 a A cluster of atoms whose magnetic fields are aligned in the same direction is a magnetic - CORRECT ANSWER- domain A device that increases or decre..