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Solar cells can produce about 40 W of electricity per square meter of surface area if directly facing the Sun. How large an area is required to supply the needs of a house that requires 22 kWh/day?
An alpha particle (mass = 6.6 x 10-24 g) emitted by radium travels at 5.0 x 107 +- 0.5 x 107 mi/hr.What is the de Broglie wavelength in meters?
At what angle must you swim (measured from the eastward bank) in order to reach the opposite bank at the exact time that your friend reaches the same spot?
If, in the course of an hour, the frog spends 32% of the time resting and 68% of the time performing identical jumps of that maximum length, in a straight line, what is the distance traveled by the
Find the horizontal component of the book's velocity, just before the book reaches the floor. Find the magnitude of book's velocity, just before the book reaches the floor.
Nitrogen and oxygen from an extensive series of oxides with the general formula NxOy. What is the empirical formula for an oxide that contains 46.68 % nitrogen ?
A quarterback claims that he can throw the football a horizontal distance of 183m (200 yd). He claims that he can do this by launching the ball at the relatively low angle of 30 degrees above the ho
An element consists of two isotopes. The abunance of one isotope is 60.1% and its atomic mass is 68.9256 u. The atomic mass of the second isotope 70.9247 u. What is the average atomic mass of the e
What was the direction of the mug's velocity just before it hit the floor? (below the horizontal)
(a) What is the ratio of the final charge on sphere C to q? (b) What is the ratio of the final total charge on the three spheres to q?
If the emission lines in a particular series of the hydrogen atom were studied (for example, the lines int he Balmer series), what type of graph would be obtained from a plot of 1/lambda as a funct
A basket ball player is 10.0 m from the basket. The height of the basket is 3.05 m. If he shoots the ball at an angle of 51.3 degrees with the horizontal from a height of 1.99 m at what speed must h
1.22 In 1994, the United States produced 89.20 billion pounds of sulfuric acid. The density of this sulfuric acid was 1.84 g/mL. (a) Determine the cubic millimeters of sulfuric acid produced.
A skateboarder, starting from rest, rolls down a 12.0 m ramp. When she arrives at the bottom of the ramp her speed is 7.70 m/s. Her acceleration is assumed to be constant. If the ramp is inclined at
An elevator (mass 4950 ) is to be designed so that the maximum acceleration is 6.00 × 10-2. What is the minimum force the motor should exert on the supporting cable?
A conducting spherical shell of inner radius 4.00 cm and outer radius 5.00 cm is concentric with the solid sphere and has a total charge of -4x10^-6 C. Find the electric field at (a) r = 1.00 cm, (b
A 75m-long train begins uniform acceleration from rest. The front of the train has a speed of 23 m/s when it passes a railway worker who is standing 170m from where the front of the train started.
If the ground state electron configuration of an element is [Ar]3d^10 4s^2 4p^4, what is the typical charge on the monatomic anion of the element ?
The runner must then accelerate at 0.20 m /s^2 for how many seconds in order to achieve the desired time?
The percentage of silver impurity in a lead sample was determined by the following procedure: A sample of lead weighing 1.050 g was dissolved in nitric acid to produce an aqueous solution of Pb2+ an
A glaucous winged gull, ascending straight upward at 5.20m/s, drops a shell when it is 12.5 m above the ground. A) What are the magnitude and direction of the shell's acceleration just after it is rel
If the benzophenone used to prepare triphenylmethanol(from a reaction of benzophenone and phenylmagnesium bromide) is wet, what by product is formed?
A helicopter is ascending vertically with a speed of 5.00 . At a height of 100 above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?
A sample of Cl2 gas at a pressure of 645 mmHg is transferred to a new container having a volume one-third of the original container. What pressure, in millimeters of mercury, does the Cl2 exert in t
A popular entertainment at some carnivals is the blanket toss. A) If a person is thrown to a maximum height of 28.0ft above the blanket, how long does she spend in the air?