Presentation on theme: "Final exam preview A boat at anchor is rocked by waves whose crests are 3 m apart and whose speed is 5 m/s. How often do these waves reach the boat? A."— Presentation transcript:
1Final exam previewA boat at anchor is rocked by waves whose crests are 3 m apart and whose speed is 5 m/s. How often do these waves reach the boat?A 40 Ω and an 28 Ω resistor are connected to a 48-V power source.a. What is the equivalent resistance of the circuit if the resistors are connected in series?b. What is the equivalent resistance of the circuit if the resistors are connected in parallel?
2Final exam previewA microwave draws a 7.5-A current from a 120-V power source.a. How much power is delivered to the microwave?b. How much energy does the microwave use to heat food for 3 minutes?
3Final exam previewWhat is the force between two small charged spheres that have charges of 4 x10–7 C and 7 x10–7 C and are placed 90 cm apart in air?What is the value of charge of a body that carries 250 excess electrons?
4Final exam previewIn a television picture tube, the work done in moving an electron is 50 x10–18J. What is the potential difference inside the picture tube?What is the quantity of charge that passes through a conductor when there is a current of 0.65 A for 20 minutes?
5Final exam previewSphere A, with a charge of µC, is placed at a distance of 5.0 cm from another sphere B. The charge on sphere B is –7.0 µC and is located to the right of sphere A. A third sphere C is placed 8.0 cm beneath sphere A. The charge on sphere C is +6.0 µC. Determine the net force on sphere A.
6Final exam previewA positive charge of 6 μC is located in an electric field of intensity 5.00 N/C directed toward the south. Find the magnitude and the direction of the force on the test charge.A battery of potential difference 12 V delivers 25 J to a conductor. What is the quantity of charge that flows through the conductor?
7Final exam previewA current of 2.0 A flows for 15.0 minutes through a bulb and delivers 8500 J of electric energy to the bulb. What is the potential difference across the bulb?A 12-V potential difference is applied across a series combination of a 6-ohm resistor and a 45-ohm resistor. What is the current in the 45-ohm resistor?
8Final exam previewHow much heat must be removed from 5 kg of water to cool it from 90°C to 5°C? The specific heat capacity of water is 4182 J/kg K.A pendulum on a different planet with a length of 3 m has a period of 2 s. What is the acceleration due to gravity at the pendulum’s location?
9Final exam previewA battery does J of work on 48 coulombs of charge. What voltage does the battery supply?A certain bulb with a resistance of 130 ohms is labeled 443 W. For what voltage circuit was this bulb designed?
10Final exam previewA lifeguard on a beach observes that waves have a speed of 7 m/s and a distance of 1.5 m between wave crests. What is the period of the wave motion?A positive test charge of 6.00 μC is placed in an electric field, which exerts a force of5.00 x 10–4 N on the test charge. What is the magnitude of the electric field strength at the location of the test charge?
11Final exam previewHow much energy is consumed in 35 minutes by a bulb with a resistance of 28 W when connected to a 12-V battery?What is the equivalent resistance of a 36-ohm and a 60-ohm resistor connected in parallel?
12Final exam previewThe sound a mosquito makes is produced when it beats its wings at the average frequency of 620 wing beats per second. What is the wavelength of the sound waves produced by the mosquito? Assume V = 340
13Final exam previewAn electron traveling 5x 107 m/s at a right angle to a magnetic field experiences a force of 8 x 10–13 N. What is the strength of the magnetic field?An object of height 8.0 cm is placed at a distance of 7 cm from a convex lens of focal length 4.0 cm.a. Find the position of the image.
14Final exam previewA 36-V potential difference is applied across a parallel combination of a 80-ohm and a 20-ohm resistor. What is the current in the 20-ohm resistor?What is the current in a 75-W bulb connected to a 110-V source?
15Final exam previewSonya hears water dripping from the eaves of the house onto a porch roof. She counts 125 drops in 2.0 min.a. What is the frequency of the drops?b. What is the period of the drops?
16Final exam previewWhat is the magnitude of the force on an electron in an electric field of 48 N/C?Waves in a lake are 2 m in length and pass an anchored boat 1.5 s apart. What is the speed of the waves?