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A 20 kg box rests on a 35 deg ramp. The coefficients of static and kinetic friction are 0.75 and 0.45, respectively. What force up the ramp is required to:
A) Just start the box moving up the ramp
B) Slide the box up the ramp at a constant speed.
c) Accelerate the box up the ramp at 1.2m/s2
As the wood flap rotates at 65.9rad/sec, it hits a switch and turns on a heater. The heater warms the bottom of a 2:0 m rod. how much has the rod grown
12.0g of aluminum at 200C and 20.0g of copper are dropped into 51.0cm^3 of ethyl alcohol at 15C. What is the initial Temp of Copper
Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. What is her useful power output
In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 15 m/s at an angle of 32° above the horizontal. How long does it take for the ball to reach the wall if it is 4.2 m away
A long pipe of outer radius 3.60 cm and inner radius 3.06 cm carries a uniform charge density of 3.22 mC/m3. calculate the electric field r = 7.56 cm from the centerline of the pipe
An airplane, whose air speed is 380 km/hr, is supposed to fly in a straight line 23.0 degrees north of due east. A steady 100 km/hr is blowing from the north. Illustrate in what direction should the plane head realative to the earth?
A ball is thrown up with a velocity of 8 m/s and allowed to fall back down. how long will the ball take to return to its initial position
an initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of 10 microc
A stone is thrown upward with an initial velocity of 6 m/s. What maximum height will the stone reach?
a worker leaves home at 900 am travels 40 km to the office and then returns home at 500 pm. what is the magnitude of
A two-slit experiment with slits separated by 4.3 10-4 m produces a second-order maximum at an angle of 0.0650° , Find the wavelength of the light used in this experiment
Block 1, of mass = 0.500 , is connected over an ideal (massless and frictionless) pulley to block 2, of mass , as shown. Assume that the blocks accelerate as shown with an acceleration of magnitude = 0.300 and that the coefficient of kinetic frict..
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