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Three masses (m = 1.2, 2.5 and 3.4 kg) are placed on a horizontal frictionless surface at the corners of an equilateral triangle of edge length l = 140 cm. Where is the center of mass?
The fan blades on a jet engine make one thousand revolutions in a time of 76.5 ms, What is the angular frequency of the blades
A hockey puck impacts a goalie's plastic mask horizontally at122 m/h and rebounds horizontally off the mask at 47mi/h. Find the average force that the puck exerts on the mask
Consider a merry-go-round that has the form of a disc with radius 5.2 m and mass 125 kg. what is the total moment of inertia
If the diameter of the fifth circular orbit of the hydrogen atom is 26.5 A, what is the frequency of the reveloution
linda pulls a sled with force 89 newtons at 30 degrees east of north. find the resultant force and direction
Suppose the magnitude of the gravitational force between two spherical objects is 2000 when they are 100 apart. find the magnitude of the gravitational force between the objects
The drawing shows three materials, a, b, and c. A ray of light strikes the a–b interface at an angle that now barely exceeds its critical angle of 40.0°. The reflected ray then strikes the a–c interface at an angle of incidence that now barely exceed..
A crate of mass 10.6 kg is pulled up a rough incline with an initial speed of 1.52 m/s. What is the change in kinetic energy of the crate
A mortar crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action. find How long will the mortar shell remain in the air
If a 500.0g cart had its velocity change from 1.65 m/s to 1.23 m/s over a period of 2.50 seconds. Calculate and record the force acting
a quarter diameter 2.40 cm is held at arms length 64.0 cm. the sun has a diameter of 1.39 x 109 m and is 1.50 x 1011 m
Find what is a reasonable length of time for a normal person to run two meters, from a dead stop to full speed ahead
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