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1. There is a light bulb in a 120. V circuit with a resistance of 100. ohms. What is the current through the bulb?
2. What is the weekly energy cost of leaving a 65 W bulb on for half the day if the electricity cost is $0.15 per kWh?
3. An electric motor draws a current of 12 A in a 240 V circuit. What is the power of this motor in W?
4. The step-down transformer in a local neighborhood reduces the voltage from a 7,200 V line to 120 V.
(a) If there are 2400 loops on the primary coil, how many are on the secondary coil?
(b) What current does the transformer draw from the line if the current in the secondary is 24 A?
(c) What are the power input and output?
the same object is located at the same distance from two spherical mirrors a and b. the magnifications produced by the
A particle leaves the origin with a speed of 3.3 times 10^6 m/s at 38 degrees to the positive x axis. It moves in a uniform electric field directed along positive y axis. Find Ey such that the particle will cross the x axis at x = 1.5 cm if the parti..
a parallel-plate capacitor has circular plates of 8.90 cm radius and 1.70 mm separation.a calculate the capacitance.b
A satellite, mass=5850-kg, is in a circular orbit of 4.1x10^5mabove the surface of a planet, which has a radius of 4.15x10^6m. How much would the satellite weigh on the surface of the planet
A neutron decays into a proton, and an electron. The neutron was initially at rest. What is the direction and speed of the proton
Think about a small event with a small budget versus a large event with a large budget and the methods you could employ.
A person pushes a 14.0 kilogram lawn mower at constant speed with a force of 85.0 Newton directed along the handle, which is at an angle of θ= 47.0 degree to the horizontal. Determine the force the person must exert on the lawn mower
Rank the magnitudes of the electric field son the surfaces, greatest first, and indicate whether the magnitudes are uniform or variable along each surface.
The attenuation (intensity loss) of ultrasound in tissue is approximately 0.3 dB per MHz per cm of depth. (E.g., a 3 MHz signal travelling during 2 cm of tissue has its initial intensity reduced by 0.3×3×2 = ?1.8 dB.)
Find the boundary layer thickness and drag on a given plate if Water at 15°C flows over a plate 2m long and 25cm wide at a velocity of 5 m/s along its length.
A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +2.7. Obtain the magnification when the convex side is used as a mirror
Does the gravitational potential energy at the initial and final points depend upon the location of the origin of the coordinate system? Does the change in gravitational potential energy dependupon the location of the origin of the coordinate system..
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