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You see the boy next door trying to push a crate down the sidewalk. He can barely keep it moving, and his feet occasionally slip. You start to wonder how heavy the crate is. You call to ask the boy his mass, and he replies " 50.0 ." From your recent physics class you estimate that the static and kinetic coefficients of friction are 0.900 and 0.4 for the boy's shoes, and 0.5 and 0.2 for the crate. Estimate the mass of the crate.
Two small nonconducting spheres have a total charge of 93.1 C. When placed 1.01 m apart, the force each exerts on the other is 11.5 N. What is the charge on each? What if the force was attractive?
What is distance of a sample of blood from the rotation axis
The current through a 686 ? resistor is 190 mA. To the nearest volt, what is the potential difference across the resistor
What is the location of an object for which the magnitude of the image distance is one-fourth the magnitude of the object distance
A galvanometer has an internal resistance of 100 ? and deflects full-scale at a current of 2.00 mA. how should this resistor be connected to the galvanometer
Derive an expression for the shift in lambda in the peak wavelength of the planck function for a black body temperature T, corresponding to a small shift in temperature.
On a frozen pond, a 9 kg sled is given a kick that imparts to it an initial speed of v0 = 2.5 m/s. find the distance the sled moves before coming to rest
A grade school student plans to build a 34-power telescope as a science fair project. What focal length is needed for her objective lens
One gallon of gasoline contains 3.1 107 calories of potential energy that are released during combustion. what is the average force produced by the gasoline
question1two window washers bob and joe are on a 3.00 m long 380 n scaffold supported by two cables attached to its
A car is traveling at 50.0 mi/h on a horizontal highway, What is the stopping distance when the surface is dry and µs = 0.601
What is the electric field strength between the disks? A proton is shot from the negative disk toward the positive disk. What launch speed must the proton have to just barely reach the positive disk?
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