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A train is traveling away from you at 120 km/h. The train blows its400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?
Calculate the force a mother must exert to hold her 12.0 kg child in an elevator accelerates upward at 0.850 m/s2
two 1.0 kg masses are 2.0 m apart on a frictionless table. each has 1.0 uc of charge.1. what is the magnitude of the
Two blocks are placed in contact on a horizontal frictionless surface. The smaller box has less mass than the larger box. A force F is applied to the small box as shown so that the boxes accelerate to the right.
A sphere of radius r starts from rest and rolls without slipping along a curved surface, dropping through a vertical distance of 0.303 m. Find the final speed v of the sphere's center of mass
The apparent weight of passengers on a roller coaster increases by 52 as the car goes through a dip with a 35 radius of curvature. What is the car's speed at the bottom of the dip
A rod of length 0.850 m is attached to a pivot at one end. A force F of 2.30 N is applied to the end of the bar opposite the pivot. The force makes an angle of 65.0o with the bar. (The ? in the figure is the angle for the "line of action" of the f..
n = 3.24 mol of Hydrogen gas is initially at T = 357 K temperature and pi = 2.79×105 Pa pressure. How much heat did the gas emit
A person is nearsighted and can clearly focus on objects that are no farther than 2.6 m away from her eyes. What is the focal length of the borrowed glasse
Suppose a molecular motor consumes 3 ATP molecules in every step. If this motor has a step size of 5.8 nm, what is the maximum force the motor could exert
A street lamp weight 164N. It is supported equally by two wires that form an angle of 129 degrees with each other. What is the tension of each of these wires.
A disk 7.96 cm in radius rotates at a constant rate of 1 150 rev/min about its central axis. Determine the radial acceleration of a point on the rim
a wire lying in the plane of the page carries a current directed toward the bottom of the page. What path will the electron follow
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