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1) The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.35 with the floor. If the train is initially moving at a speed of 48 km/h, in how short a distance can the train be stopped at constant acceleration without causing the crates to slide over the floor?
2) In the figure below, a slide loving pig slides down a certain 32° slide in twice the time it would take to slide down a frictionless 32° slide. What is the coefficient of kinetic friction between the pig and the slide?
Then, calculate the exact number of protons and express the answer in scientific notation with the correct number of significant digits.
A baseball (m = 155 g) approaches a bat horizontally at the speed of 40.5 m/s (91 mi/h) and is hit straight back at a speed of 45.5 m/s (102 mi/h).
A ski starts from rest and slides down a 22° incline 75 m long. If the coefficient of friction is 0.09, what is the ski's speed at the base of the incline? If there is snow level at foot of the incline and it has the same coefficient of friction, ..
How to compute for the density of dark matter estimate mass density of dark matter in the solar neighbourhood. Express the answer in units of kg m-3, Msun pc-3, Msun AU-3.
If, as is typical, each of them breathes about 500 {rm{ cm}}^3 of air with each breath, approximately what volume of air (in cubic meters) do these astronauts breathe in a year.
What diameter has the tip of the minute hand with 100mil/hr tangential speed? Illustrate what diameter has the tip of the hour hand with 100mil/hr speed?
Determine the amount by which the star's thermal radiation increases the entropy of the universe each second. Assume that the star is a perfect blackbody, and that the average temperature of the rest of the universe is 2.73 K. Do not consider ther..
A 116 kg chesterfield is pushed up a frictionless ramp at the constant speed by a delivery person. If the ramp is inclined at 25.80° to horizontal. What is the magnitude of the normal force that is exerted on the chesterfield by the ramp.
A positive charge of 0.800? C is located in a uniform field of 1.20×105 N/C. A negative charge of -0.400? C is brought near enough to the positive charge that the attractive force between the charges just equals the force on the positive charge du..
Find the positions of the two masses at any subsequent time t (before either mass returns to the table) and describe the motion.
A 92 kg man standing on a surface of negligible friction shoves a 73 g stone lying at his feet, giving it a velocity of 4.0 m/s. What velocity does the man acquire as a result.
A series RLC circuit has the following values: L =20mH, C=100 nF, R=20 Ohms, calculate the average power delivered to this RLC circuit
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