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A 55.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.700 and 0.440, respectively
(a) What horizontal pushing force is required to just start the crate moving?
(b) What horizontal pushing force is required to slide the crate across the dock at a constant speed?
A 3.8-kg block of iron (c=0.11 kcal/kgoC) that has been brought to a temperature of 1,078oC is placed on top of a 2.4-kg block of ice (c=0.5 kcal/kgoC) that has been cooled to -50oC
A 18.60 kg piece of zinc at 75 degrees Celsius is placed in a container of water. The water has a mass of 20 kg and has a temperature of 10.10 degrees Celsius before the zinc is added. What is the final temperature of water and zinc.
On a spacecraft, two engines are turned on for 658 s at a moment when the velocity of the craft has x and y components of velocity v0x = 4115 m/s and v0y =5135 m/s, Find the x and ycomponents of the craft's acceleration
When at rest, two trains have sirens that emit a frequency of 300 Hz. The trains travel toward one another and toward an observer stationed between them, What is the speed of the second train
A 25-ohm resistor, a 55-ohm resistor, and a 75-ohm resistor are connected in parallel and placed across a 9.0-V battery. What is the current through each branch of the circuit
An electron is placed in a uniform electric field of strength 210 N/C. If the electron is at rest at the origin of a coordinate system at t = 0 and the electric field is in the positive x-direction
the four particles form a square of edge length a = 4.50 cm and have charges q1 = +25.0 nC, q2 = -50.0 nC, What net electric field do the particles produce at the square's center
With a 0.100 kg mass at 0.10 m and 0.200 kg mass at 0.95 m suspended on a meter stick, the postion of the support when balance is achieved is 0.620 m. Calculate sum of counterclockwise moments about the end of the meter stick
Initially at a temperature of 89.0?C, 0.300m3 of air expands at a constant gauge pressure of 1.40×105Pa to a volume of 1.43m3, Compute the total work done by the air
Order of magnitude estimation: Using physics intuition, estimate the muzzle velocity of a projectile launcher
A novice skier, starting from rest, slides down a frictionless 28.00 incline whose vertical height is 170. How fast is she going while she reaches the bottom?
A 1kg block at the bottom of a ramp is on a compressed spring with the spring constant k=300N/m. what is the initial acceleration of the block up the ramp
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