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Funny numbers. Here's a quotation from a book review in a scientific journal:
. . . a set of 20 studies with 57 percent reporting significant results, of which 42 percent agree on one conclusion while the remaining 15 percent favor another conclusion, often the opposite one.
Do the numbers given in this quotation make sense? Can you decide how many of the 20 studies agreed on "one conclusion," how many favored another conclusion, and how many did not report significant results?
A monoenergetic beam of electrons is incident on a single slit of width 0.95 nm. A diffraction pattern is formed on a screen 24 cm from the slit. what is the energy of the incident electrons
two small charges with a mass of 1 gram each are connected by 2 cm long insulating rod of negligible mass. Obtain the moment of inertia around the center of mass
Consider two parallel-plate capacitors identical in shape, one aligned so that the plates are horizontal (Figure 1) , and the other with the plates vertical (Figure 2) . The horizontal capacitor is filled halfway with a material that has dielectri..
imagine that you put a block of copper with a mass of 320 g and initial temperature of -35degc into an insulated cup
The output voltage of an AC generator is given by ?v = (160 V) sin (50?t). The generator is connected across a 19.0-? resistor, By inspection, what is the maximum voltage
A parallel-plate air capacitor is made by using two plates 19 cm square, spaced 3.5 mm apart. It is connected to a 3-V battery. What is the electric field between the plates
An electron starts from rest 5.00 cm from the center of a uniformly charged sphere of radius 4.00 cm. If the sphere carries a total charge of 1.00 x10-9 C, how fast would the electron be moving when it reaches the surface of the sphere.
A rocket with a mass of 2.8 x 106 kilogram is launched on Earth with an upward thrust force of 6.4 x 107 Newton. Compute what is its acceleration
The image produced by a concave mirror is located 37 cm infront of the mirror. The focal length of the mirror is 14 cm. How far in front of the mirror is the object located
Consider an elastic collision (ignoring friction and rotational motion). A queue ball initially moving at 2.9 m/s strikes a stationary eight ball of the same size and mass. After the collision, the queue ball’s final speed is 1 m/s. Find the queue ..
You dip our finger into a pot of water twice each second, producing waves with crests that are separated by 0.15 meter. Find the frequency period and speed of these water waves
What is a rankine cycle? How does one develop the efficiency in the said cycle?
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