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Leonardo da Vinci (1452-1519) is credited with being the first to perform quantitative experiments on friction, though his results were not known until centuries later, due in part to the secret code (mirror writing) he used in his notebooks. Leonardo would place a block of wood on an inclined plane and calculate the angle at which the block begins to slide. Here ports that the coefficient of static friction was 0.27 his experiments. Find at what angle did Leonardo blocks begin to slide?
The origin of the coordinate system and with a label at their heads. Two of these vectors are given in terms of the unit-vectors I and j as
a 0.17hp electric motor on a water well pumps water from 42.64m below the surface. the density of water is 1.0 kgliter.
q1. what mass in grams of steam at 100degc should be mixed with 257 g of ice at its melting point in the thermally
Two boxes of masses m and 2m are in contact with eachother on a frictionless surface and are pushed by a force F from the left
A 1-cm-thick layer of water stands on a horizontal slab of glass. After entering the glass, what is the ray's angle from the normal
A 45.0-kg person steps on a scale in an elevator. The scale reads460 N. What is the magnitude of the acceleration of the elevator
The radius of a typical nucleus is about 5.0 x 10^-15 m. Assuming this to be the uncertainty in the position of a proton in the nucleus, approximation the uncertainty in the proton's energy (in eV).
A ball of mass 4.9 g with a speed of 22.5 m/s strikes a wall at an angle 29.0o and then rebounds with the same speed and angle. compute the average force exerted by the ball on the wall
A person lifts a 3.5 kg cement block avertical distance of 1.43 m and thencarries the block horizontally a distance of 13.70 m. How much work is done by the person in the process
What focal length does the lens need. how many meters will the car have moved before it begins to slow down.
The vertical displacement of particles in a string (when a wave is propagating through it) is given by y = (0.02) sin[(10?)t %u2013 (8?)x], What is the amplitude, wavelength, and speed of the wave
Water flows through a horizontal pipe of cross-sectional area 10.0 cm2 at a pressure of 0.250 atm. What is the pressure at the valve
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