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A child is walking along the sidewalk at a constant speed of 1 m/s while pulling his dog sitting in a wagon. The dog has a mass of 30 kg and the wagon weighs 50 N. If the child pulls the wagon with a force of 60 N at an angle of 30°, what is the frictional force exerted by the wagon on the dog?
Find the quantum uncertainty of the position of a car along its direction of motion. Assume that the mass of the car is 1840 kg and its speed is known with accuracy ?v = 1 km/hour
A point like charge of +20nC sits at the center of a thick spherical shell of inner radius 4cm and the outer radius 6cm. The shell is made of copper and has a net charge of -10nC. Describe the distribution of charge on the conductor
A boy is standing on a frozen lake (i.e. no friction) holding a rope that is attached to his sled. He pulls on the rope and exerts a horizontal force of 5.2 N, What is the acceleration of the boy
A stone has a mass of 3.15 g and is wedged into the tread of an automobile tire, as the drawing shows. The coefficient of static friction between the stone and each side of the tread channel is 0.941. determine the radius r of the tire
A 1,000.0 kg car with a speed of 90.0 km/h brakes to a stop. How many calories of heat are generated by the brakes as a result
An object with a mass of 23 kg lies on a horizontal frictionless surface. What is the normal force on the object in Newtons
Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.19 m. find the magnitude of the initial acceleration of the third sphere
What horizontal force is needed to hold bag in new position
The Tevatron at the Fermi National Laboratory can accelerate protons to a kinetic energy of 1 TeV. In one particular experiment the kinetic energy of the protons is 650 GeV. What is the de Broglie wavelength of these protons
An object is placed to the left of a convex lens and on the optical axis. find the magnification of the image formed by the lense
q1. from a cliff that is 9.4 m above a lake a young woman mass 44 kg jumps from rest straight down into the water. at
A 0.148-A current is charging a capacitor that has square plates 6.00 cm on each side. The plate separation is 4.00 mm. Find the displacement current between the plates
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