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Question: A beam has an axial tensile load of 45 kN and concentrated loads of 6.75 kN at the three quarter points of the beam. What would the maximum and minimum stresses be on a 100- by 150-mm rough-sawn beam simply supported on a 2.1-m span?
A 8.41 kg crate slides on a horizontal surface. The coefficient of kinetic friction between the surface and the crate is 0.496. what is the magnitude of the external force acting on the crate
You throw a ball straight down from an apartment balcony to the ground below. Find the height of the balcony
The 2.0 m stick weighs 6.0 N and is suspended by support cords ateach end. Calculate the support force at the right end of the board
String 1 in the figure has linear density 2.90 and string 2 has linear density 3.20 . A student sends pulses in both directions by quickly pulling up on the knot, then releasing it. Consider the pulses are to reach the ends of the strings simultaneou..
Suppose you want to use this water as the low-temperature thermal reservoir for an electric heat pump to heat the cabin of a boat at 20 °C.
What are the displacement and velocity of the point on the cord. What is the magnitude of the acceleration of one of the liners toward the other because of their mutual gravitational attraction.
A meter stick lies on the bottom of a 100-cm-long tank with its zero mark against the left edge. You look into the tank at a 30 degree angle, with your line of sight just grazing the upper left edge of the tank.
A meterstick moving at 0.892c relative to the Earth's surface approaches an observer at rest with respect to the Earth's surface. What is the meterstick's length as measured by the observer
A photon has an energy equal to the kinetic energy of an electron with speed, u, which may be close to the speed of light, c. Calculate the ratio of the wavelength of the photon to the wavelength of the electron
A light ray initially in water enters a transparent substance at an angle of incidence of 39.0°, Calculate the speed of light in the transparent substance
What is the current through the 6 ohm resistor?
Wavelengths of light from a remote galaxy are found to be 1.5 % longer than the corresponding wavelengths measured here on earth. What is the speed of the galaxy relative to earth
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