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The slant shear test is widely accepted for evaluating the bond of resinous repair materials to concrete; it utilizes cylinder specimens made of two identical halves bonded at 30°. For 12 specimens prepared using wire-brushing, the sample mean shear strength (N/mm2) and sample standard deviation were 19.06 and 1.74, respectively, whereas for 12 hand-chiseled specimens, the corresponding values were 24.6 and 3.96. Does the true average strength appear to be different for the two methods of surface preparation? Test the relevant hypotheses using a significance level of .05. (Give ? to exact integer and t to 2 decimal places.)
a.) ? = ?
b.) t (?wire - ?hand) = ?
The ground state for a single valence electron of a rubidium atom (Z=37) is 5s and its energy is –4.18 eV. The valence electron is excited into the 5g state. We want to determine the energy of this 5g electron. Assume that the wave function for th..
The process is claimed to produce 2000 J/min of work and to require an undisclosed amount of heat transfer with a heat reservoir at 300 K. Should inventor be issued a patent of this device.
You're riding on a cart, carrying a box, moving at an initial speed of vi. You throw the box off the cart such that it lands at rest, what will be the final speed of the cart
A car drives straight off the edge of a cliff that is 60 m high. The police at the scene of the accident observed that the point of impact is 134 m from the base of the cliff. How fast was the car traveling while it went over the cliff.
Ferris wheel has radius 5.0 and makes one revolution in 8.0 seconds. What is the apparent weight (the the normal force exerted on her by the bench) of the person
A solenoid 10.0 cm in diameter and 75.4 cm long is made from copper wire of diameter 0.100 cm, What power must be delivered to the solenoid if it is to produce a field of 7.60 mT at its center
question1a student decides to move a box of books into her dormitory room by pulling on a rope attached to a box. she
A charge +8.2 ?C is placed at the center of the hollow spherical conductor with the inner radius 3.3 cm and outer radius 5.0 cm. What is the total charge on the interior surface
a 1cm-tall object is 6cm in front of a converging lens with a focal length of 10cm. Use ray tracting to determine the location of the image on graph, Calculate the image position and height using the lens equation
Light of wavelength 540.00 nm is incident normally on a diffraction grating, How many slits/mm are marked on the grating
A box rests on top of a flat bed truck. The box has a mass of m = 18.0 kg. The coefficient of static friction between the box and truck is ?s = 0.82, what is the frictional force the truck exerts on the box
A jet is circling an airport control tower at a distance of 18 km. An observer in the tower watches the jet cross in front of the moon. Find the distance traveled (in meters) by the jet
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