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Turning a doorknob through 0.40 of a revolution requires 0.12 of work.
What is the torque required to turn the doorknob?
As a particle moves from the origin to (1i + 7j) m, it is acted upon by a force given by (2i + 6j) N. Calculate the work done by this force on the particle
a whistle of frequency 527 hz moves in a circle of radius 60.3 cm at an angular speed of 12.3 rads. what are a the
A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. how fast is the roller coaster traveling at the bottom of the dip
a block of mass m 3.0 kg is attached to a spring of constant k 240 nm. it can slide along a board tilted at an angle
According to a report on traumatic brain injury, the force that a professional boxer's fist exerts on his opponents head is equivalent to being hit with a 5.9 kg bowling ball traveling at 8.9 m/s that stops in .018s
Ice of mass 11.0 kg at 0.00° C is placed in an ice chest. The ice chest has 3.10 cm thick walls of thermal conductivity 1.00 x 10^-5 kcal/s · m · C°, How much heat must be absorbed by the ice before it melts
A mass m = 2.4 kg is at the end of a horizontal spring of spring constant k = 265 N/m on a frictionless horizontal surface. Calculate the angular frequency of the oscillation in rad/seconds
The primary coil of a transformer has 237 turns; secondary coil has 2100 turns. An alternating current is sent through the primary coil. The emf in the primary is 25 V. What is the emf amplitude in secondary.
In an action movie, the villain is rescued from the ocean by grabbing onto the ladder hanging from a helicopter. what was the speed at which the helicopter was ascending
The largest building in the world by volume is the Boeing 747 plant in Everett, Washington. What is its volume in cubic feet
Starting from rest, a 12 cm diameter compact disk takes 2.4 s to reach its operating angular velocity of 2030 rpm. How much torque is applied to the disk
A woman at an airport is towing her 20.5 kg suitcase at constant speed by pulling on a strap at an angle of ? above the horizontal. What normal force does the ground exert on the suitcase
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