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A dockworker loading crates on a ship findsthat a 18 kg crate, initially at reston a horizontal surface, requires a 78N horizontal force to set it in motion. However, after the crate isin motion, a horizontal force of 56 Nis required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor.
A tuning fork with a frequency of 440 Hz is held just above the top of a uniform glass tube containing water. What is the speed of sound in air
When responding to sound, the human eardrum vibrates about its equilibrium position, what is the frequency (in Hz) of the eardrums vibration
Two coils are close to each other. The first coil carries a time-varying current given by I(t) = (5.80 A) e-0.0250tsin(377 t). What is the mutual inductance of the coils
If 7 V is applied to the above circuit and the voltage across the first lamp is 1 V, what is the voltage across the second lamp
William Tell is shooting at an apple that hangs on a tree. The apple is a horizontal distance of 20.0 m away and at a height of 4.00 m above the ground. what is the arrow's initial velocity
A string with a mass per length of 2.00 gm/m is stretched with a force of 120 N between two points that are 0.400 m apart. What is the length of the organ pipe
what is the maximum deformation of the bumper. The coefficient of kinetic friction for a 25 bobsled on a track is 0.10. What force is required to push it down a 5 incline and achieve a speed of 64 at the end of 75.
After the interaction, the particles (which can't be distinguished) are observed moving at angles 55.3° and 34.7°, both angles being measured with respect to the original direction of motion. Illustrate what are the final speeds of the particles?..
A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the lamp
You are at the controls of a particle accelerator, sending beam of 3.90 x 10^7 m/s protons (mass m) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of t..
There is a tree in the middle of your front yard and you take pictures of a squirrel as it runs around the tree. what is the average acceleration of the squirrel between the first and third pictures
24.0g of copper pellets are removed from a 300oC oven and immediately dropped into 110mL of water at 25.0oC in an insulated cup. What will the new water temperature be
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