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Solar cells generate a potential difference when exposed to sunlight. In an experiment, you wish to charge a rechargeable battery by connecting it in series to an array of solar cells. You perform the experiment outdoors, in direct sunlight, when the intensity of solar radiation is 1000 W/m2. However, your solar cells only have an efficiency of 15% (that is, only 15% of the sunlight power transmitted to the solar cells is delivered to the rechargeable battery). While the circuit is connected, you measure at one instant the potential difference across the battery to be 4.75 V and the current in the circuit to be 0.23 A. What is the area of the array of solar cells?
m2
A fish swimming in a horizontal plane has a velocity vi = (3.3i + 1.6j) m/s at a point in the ocean where the position relitive to a certian rock is ri = (10.5i - 3.9j) m. After the fish swims with a constant acceleration for 20.6 s, it's velocity..
The 1900-turn coil in a dc motor has an area per turn of 1.1 10-2 m2. The design for the motor specifies that the magnitude of the maximum torque is 5.8 N · m, What is the current in the coil
A woman slowly lifts a box weighing 48.0 N from the floor to a shelf 1.50 m above, Find the net work done on the box
Assuming that the bricks are lifted with constant speed, illustrate what is the minimum power the motor must produce?
Four identical 7 mC charges are placed on a neutrally- charged penny, Determine the resulting potential in the center of the penny due to the four charges
A water molecule, which is electrically neutral but has a dipole moment of magnitude p = 6.20·10-30 C m, is 3.20 cm away from a point charge q = +6.90 ?C, Calculate the magnitude of the net force
A 17.00 kg block is pushed up a frictionless inclined plane that makes an angle of ? = 33 o with the horizontal direction. What force is needed to move the block with constant speed
A solid has a volume of 8cm3. When weighed on a spring scale calibrated in grams, the scale indicates 20g. What does the scale indicate if the object is weighed as immersed in a liquid of density 2g/cm3.
What is the electric potential difference between two points that are 3.00 cm and 5.00 cm from a proton
A simple camera telephoto lens consists of two lenses. The objective lens has a focal length f1 = 38.8 cm. Precisely 35.7 cm behind this lens is a concave lens with the focal length f2 = -10.3 cm. The object to be photographed is 3.97 m in front o..
Find the capacitance of a parallel plate capacitor that has two square plates both having a side length of 6 cm, where these plates are seperated by 15 mm
At a soft drink dispenser, a restaurant patron put 0.2 kg of crushed water ice, at a temperature of ?5 C, into an insulating cup. [In fact, the ice was slightly colder before it left the machine, but its warming to ?5 C cooled the inside surface o..
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