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Describe why Pluto was demoted from the planet status. Be sure to describe what class of planetoid it is considered now, and a little about the other bodies that share this distinction in our solar system. What is your opinion on this decision? Do you agree or disagree?
An object hanging in air, as in Figure A below, caused the scale to balance at 0.420 kg. Find the apparent weight of the object when submerged in water
A girl sits fixed on a merry-go-round of mass M = 500 kg and radius R = 2 m. The merry-go-round is at first at rest and is free to rotate without friction.
A small electric car overcomes a 250 N friction force when traveling 30 km/h. How much power is dissipated in the coils
A long horizontal wire carries a current of IT = 46.9 A. A second wire (I), made of 3.00 mm diameter copper wire and parallel to the first but L = 13.8 cm below it, What is the current in the lower wire
q1. points a and b have electric potentials of 243 v and 129 v respectively. when an electron released from rest at
The walls of a blackbody cavity are at a temperature of 27 degrees C. find the frequency of the radiation of maximum intensity
A boy of mass 49.4 kg is initially on a skateboard of mass 2.00 kg, moving at a speed of 10.3 m/s. Find the final velocity of the skateboard
A 92.7-kg climber is scaling the vertical wall of a mountain. His safety rope is made of a material that, How much is the rope stretched when it breaks his fall and momentarily brings him to rest
A bicyclist is finishing his repair of a flat tire when a friend rides by with a constant speed of 3.27 m/s. What is his speed when he catches up
A proton is initially at rest at a point where the potential is 507V. Sometime later the proton is at a point where the potential is 187V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.
A proton is at the origin and an electron is at the point x= 0.35nm , y= 0.34nm .Find the electric force on the proton.
A disk rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity decreases to 10 rad/s. How many radians does the disk turn through during the 5.0-s interval
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