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If E = 9.0 V, what is the current in the 15 ohms resistor? and what is the voltage on the 30 ohms resistor?
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What is electricity? a. The movement of protons. b. The movement of electrons. c. The movement of neutrons. d. The movement of atoms.
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What is the average force exerted by a shot-putter on a 7.0 kg shot if the shot is moved through a distance of 2.8 m and is released with a speed of 1.3 m/s?
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When a light bulb is connected to a 9 V battery, it draws 1.1 A of current. How much power is produced by the battery?
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An ornamental thermometer, commonly known as a Galileo thermometer, contains a number of spheres of hollow colored glass, representing different temperatures, immersed in a column of ethanol. A particular sphere rises from the bottom to the top of the col
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The chisel exerts a force of 20 lb on the wood dowel rod which is turning in a lathe. Resolve this force into components acting (a) along the n and t axes and (b) along the x and y axes.
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A 30-ohm resistor and a 70-ohm resistor are connected in series to a 20-V battery. What is the voltage across the 70-ohm resistor? Group of answer choices: a. 10 V b. 14 V c. 6 V d. 20 V
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Assume all resistors to be 10 ohm. If a 6 volt battery is connected between points A and B, what will be the current in the vertical resistor?
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With a 1200-W toaster, how much electrical energy is needed to make a slice of toast (cooking time is 1 minute)? At 8 cents/kWh, how much does this cost?
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Find the impedance of a capacitor with a capacitance of 1 nF when the AC frequency is 5 kHz. a) Find the impedance.
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A crowbar 25 inches long is pivoted 6 inches from the end. What force must be applied at the long end in order to lift a 500 lb object at the short end?
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The disk drive in a portable CD player is connected to a battery that supplies it with a current of 0.22 A. How many electrons pass through the drive in 4.5 s? Express your answer in scientific notati
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An operator is required to apply 66 ft-lbs of torque to a bolt. The operator can apply a maximum of 37 pounds of force to the end of the wrench. What is the minimum length of torque wrench required, in inches?
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Each minute, 73,800 m^3 of water passes over a waterfall 96.3 m high. Assuming that 58.0 % of the kinetic energy gained by the water in falling is converted to electrical energy by a hydroelectric generator, calculate the power output of the generator. (T
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The assembly consists of two 10-mm diameter red brass C83400 copper rods AB and CD, a 15-mm diameter 304 stainless steel rod EF, and a rigid bar G. The modulus of elasticity for red brass C83400 is 1
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The engine hoist is used to support the 200-”kg” engine. Determine the force acting in the hydraulic cylinder ”AB”, the horizontal and vertical components of force at the pin ”C”.
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While discussing the various types of transmissions found on today’s vehicles, Technician A says that one type is the sliding gear transmission. Technician B says that one type is the sliding collar transmission. Who is correct? a. Technician A only b. T
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Problem 1. A tetherball leans against the smooth, frictionless post to which it is attached. The string is attached to the ball such that a line along the string passes through the center of the ball.
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A hair dryer draws 1200 W, a curling iron draws 800 W and an electric light fixture draws 500 W. If all three of these appliances are operating in parallel on a 120 V circuit, what is the total curren
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An epicyclic gearbox has a fixed sun gear D Planet gears B have 25 Teeth. Input is Arm A and output is internal Gear C with 250 teeth. Given the input rpm is 1000 rpm, input Torque is100 N. m. & gearbox efficiency is 75%. Calculate (a) No. of Teeth on su
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A crane is being used to build a skyscraper. The engine can lift with 6900 W of power. How long will it take the crane to lift a 2100 kg beam to a height of 120 m?
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An electric motor lifts an elevator 9 m in 15 s by exerting an upward force of 1.2*10^4 N .Calculate the power produced by the motor.
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Two resistors, with nominal values of 4.7 kilo ohm and 10 kilo ohm, are used in a voltage divider with a +15-V supply to create a nominal +5-V output. Assume the resistor values to be exact. a. What is the actual output voltage produced? b. Which resistor
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To lift a wire ring of radius 1.75 cm from the surface of a container of blood plasma, a vertical force of 1.61 \times 10^{-2} N greater than the weight of the ring is required. Calculate the surface tension of blood plasma from this information.
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A 12-kg block A rests on a 45-kg plate B. Draw the FBD of plate B and determine the time needed for block A to slide 0.5 m on the plate when the system is released from rest. Neglect the mass of the rope and pulley.
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A 55 g rubber duck is floating in a tub of water (density 1000 k g / m 3 . The cross-sectional area of the duck is 0.0032 m 2 . The buoyancy force is given by ? A y g where buoyancy is an upward f
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Calculate the power of a hair dryer that operates on 120 V and draws a current of 10 A.
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a. Derive the capacitance per unit length of a coaxial capacitor consisting of a conducting rod, radius a, and a conducting tube surrounding it of inner radius b. In your derivation, begin with the de
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A coil has a resistance of 30 ohms and an inductance of 0.5 H, if the current flowing through the coil is 4 amps, what will be the value of the supply voltage if its frequency is 50 Hz?
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Two charged metal spheres and an ebonite rod create an electric field at a spot between the two spheres. This field has a magnitude of 2.0 N/C and is directed in the eastward direction. Determine the
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A heating coil made of Nichrome wire draws 350 W when operated using 110 V. The wire is 0.650 mm in diameter. a) What is the current passing through the coil? A b) ssume the resistivity, rho, of the
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A capacitor is formed from a hollow copper sphere of inner radius 36.3 cm and an outer radius of 45.4 cm. Calculate the capacitance of the sphere in microfarads.
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(a) A 4.00 F capacitor is connected to a 12.0 V battery. How much energy is stored in the capacitor? (b) If the capacitor had been connected to a 6.00 V battery, how much energy would have been store
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A 600W flashlamp fitted to a camera is operated by discharging a 10000 uF capacitor through the lamp. The capacitor is charged initially from a 6V battery. Calculate A) the energy stored in the capac
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Three resistors with values of 30 Ohms, 60 Ohms, and 90 Ohms, are connected in series. What is the equivalent resistance of the three resistors?
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A narrow rod of pure iron has a resistance of 0.10 ohms at 20 degrees C. What is the resistance at 50 degrees C? (Coefficient of resistivity = 6.51 times 10^(-8) C^(-1))
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How to convert AC current to DC current with a formula
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A small motor runs a lift that raises a load of bricks weighing 866 N to a height of 11.7 m in 26.2 m/s. Assuming that the bricks are lifted with constant speed, what is the minimum power the motor must produce?
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A 6.0 uF capacitor charged to 50V and a 4.0 uF capacitor charged to 30 V are connected to each other, with the two positive plates connected and the two negative plates connected. What is the potentia
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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. (a) If you bring a “100-W” European bulb home to the United
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