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(a) If the cost of electricity is $0.15/kWh, what is the cost of operating the heater during a 30-day month? (b) What is the resistance of a typical water heater?
Alpha particles of charge q = +2e and mass m = 6.6 x 10-27 kg are emitted from a radioactive source at a speed of 1.5 x 107 m/s. What magnetic field strength would be required to bend them into a circ
Find the rate at which heat is removed from an ice cube by radiation just as the water begins to freeze.
Three hours later, the course of the hurricane suddenly shifts due north, and its speed slows to 26.0 km/h. How far from Grand Bahama is the hurricane 4.20 h after it passes over the island?
Determine the forces exerted by the vane on the water if v1 = 20 m/s and v o = 8 m/s. The jet is 50 mm in diameter.
An electron moves in the positive x-direction a distance of 2.43 m in 2.99·10-8 s, bounces off a moving proton, and then moves in the opposite direction a distance of 1.75 m in 3.37·10-8
You decide to determine the depth of a tank of water using the sun's light. With the sun overhead, the tank's bottom is lit, but as the sun sets the bottom begins to be shaded. The tank is 3 feet ac
The electric field has a constant value of 2.7 x 105 V/m and is directed downward. The field is the same everywhere. The potential at a point P within this region is 119 V. Find the potential at the
What is the radioactivity due to K-40 for a person weighing 70 kg? 2. What is the radioactivity due to K-40 for all people on Erath? isotope of potassium
If the initial kinetic energy of the electron is 105 eV and if the electron is to stop (owing to electrostatic repulsion from the plate) just as it reaches the plate, how far from the plate must it
A lamp (R = 147 ), an electric heater (R = 26 ), and a fan (R = 52 ) are connected in parallel across a 120 V line. (a) What total current is supplied to the circuit? (b) What is the voltage across
Calculate the number of radioactive nuclei in the sample at t=0 (A0) 2. Calculate the activity of the sample after 6 minutes 3.
Bob throws a golf ball horizontally at 9 m/s off a the top of a hospital building and hears it hit the parking lot 3.2 seconds later. What was the total displacement of the ball? Total displacement
Calculate how much more CO2 emission (in g/kg/ton) we can expect per day after 5 years compared to the present emission from cars only in San Jose, while the carbon emission rate per car per day is
An electron acquires 7.95×10-16J of kinetic energy when it is accelerated by an electric field from plate A to plate B. What is the potential difference between the plates? Which plate is at t
How much work does the electric field do in moving a proton from a point with a potential of +145V to a point where it is -60V ? Express your answer in joules. then express your answer in electron
A small object A, electrically charged, creates an electric field. At a point P located 0.250m directly north of A, the field has a value of 40.0N/C directed to the south. What is the charge of obj
A proton is released in a uniform electric field, and it experiences an electric force of 8.65×10-14N toward the south. What is the magnitude of the electric field? What is the direction of the
A charge of 7.65mC is placed at each corner of a square 0.230m on a side. Determine the magnitude of the force on each charge. Determine the direction of the force on each charge.
Two charged dust particles exert a force of 7.3×10-2N on each other. What will be the force if they are moved so they are only one-eighth as far apart?
They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.13 x10^-11 m. What is EPEfinal - EPEinitial, which is the change in the el
What is the (a) magnitude and (b) direction of the boat's velocity relative to the ground? Give the direction as the angle of the velocity from due north, positive if to the east and negative if to
Assume that air resistance is absent. Hint: Remember that the velocity of the jeep relative to you is zero. Thus, the horizontal component of the tire's velocity relative to you is also zero. Even i