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A boy pushes a 3.1 kg. book against a vertical wall with a horizontal force of 40 N. What is the minimum coefficient of friction that will keep the book in place without sliding?
What is the electric potential energy of a system that consists of two protons 2.0×10?15 apart-as might occur inside a typical nucleus?
entropy two identical bodies with heat capacities at constant volume which vary linearly with tempereature cv10t are
A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.170 .
an green hoop with mass mh 2.6 kg and radius rh 0.13 m hangs from a string that goes over a blue solid disk pulley
A 36.0-kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 20.0 m. What is the centripetal acceleration of the child
Calculate the orbital period of Neptune (in yr) from knowledge of G, the mass of the sun (M = 1.99×1030 kg), and the orbital radius of Neptune of 3.00×101A.U
The A string of a violin is 32cm long between fixed points with a fundamental frequency of 440Hz and a mass per unit length of 6.5×10-4 kg/m. What is the wave speed in string.
a semicircle of radius a is in the first and second quadrants with the center of curvature at the origin. positive
A wrench is thrown at a speed of79 mph at a wall that is 44 ft away. Upon colliding with the wall the wrench exerts 77lb of force due east on the wall. How much force does the wall exert on the wrench and in what direction?
A thin film of oil (n = 1.24) is located on a smooth, wet pavement. When viewed perpendicular to the pavement, How thick is the oil film
Julie drives 100 mi to her Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 25mph and the other half at 80. On her return trip, she drives half time at 25mph and half the time at 80 mph.
A motorist travelling at 82 km/hr is being chased by a police car at 131 km/hr. If the police car starts from 3.5 km back, how long does it take to catch the motorist? Leave time in hours.
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