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A 70 kg painter holding a 15 kg paint is climbing up a 30 m-long ladder, which weighs 20 kg, against a frictionless wall at an angle of 60 degree.
(a) What is the minimum value of the static friction coecient that prevents the ladder from slipping when the painter is at 20m up along the ladder?
(b) If s = 0.01, how far could the painter go up along the ladder?
A horizontal pipe contains water at a pressure of 111 kPa flowing with a speed of 1.8.00 m/s. The pipe narrows to one-half its original diameter. What are speed and pressure of the water while the pipe narrows?
A plano convex lens is placed convex side down on a plane glass plate and illuminated from the above with red loght of wavelength of 625nm. what are the curvature and focal length of the convex surface of the lens
Consider a nonconducting rod that would make a great wire except for the fact that it is nonconducting, Find the electric field strength at a point on the axis of the rod
A bullet hit a block of wood with a mass of 10 kg, traveling horizontally at 300 m/s. What is the recoil velocity of the block
A small metal ball with a charge of 0.45 C and a mass of 34 g (0.034 kg) enters a region where there is a magnetic field of 0.55 T. From Newton's second Law, what is the magnitude of the acceleration of the charged ball
A total charge of 100 coloumbs flows past point A in a circuit in 4 seconds. calculate the current at point A
The company's tax rate is 30% and its discount rate is 15%. Illustrate what is the net present value of the asset?
Sketch on Eratosthenes' method, if two observers are due north and south of each other and are separated by 700 km, what is the circumference of their spherical world if they see same star on their meridian at altitudes of 26 degrees and 47 degrees r..
A fishing line has attached to it a hollow plastic float 2.15 cm in diameter and having a mass of 1.90 g. Find the mass of a lead weight
A highway curve of radius 560m is designed for traffic moving at a speed of 94.0km/hr. What is the correct banking angle of the road
An air conditioner is used to keep the interior of a house at a temperature of 25C while the outside temperature is 34C a)If heat leaks into the house at the rate of 11kW, and the air conditioner has the efficiency of a Carnot engine, what is the ..
One tire is inflated to a pressure of 40 and goes a distance of 18.0 ; the other is at 105 and goes a distance of 93.4. Assume that the net horizontal force is due to rolling friction only and take the free-fall acceleration to be = 9.80.
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