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A piñata of mass 3.30 kg is attached to a string tied to a hook in the ceiling. The length of the string is 0.77 m, and the piñata is released from rest from an initial position in which the string makes an angle of 55.8° with the vertical. What is the work done by gravity by the time the string is in a vertical position for the first time?
a 57 kg researcher absorbs 6.3*10^8 neutrons in a workday. The energy of the neutrons is 2.6 MeV. What is the equivalent dosage of the radiation exposure
A child in danger of drowning in a river is carried downstream by a current that flows uniformly with a velocity of 2.0 meters per second.
write down Newton's Second Law for the velocity of the cube.
Think of the relationship between Kirchoff's Junction Rule and conservation of charge, Why cant charge build up at a junction of wires
How many electrons would have to be removed from one sphere and added to the other to cause an attractive force between the spheres of magnitude 1.00 x 10^4 N (roughly one ton)? Assume that the spheres may be treated as point charges.
A note of frequency 700 Hz. has an intensity of 5.0E-06 W/m^2. What is the amplitude (in meters) of the air vibrations caused by this sound
A flea pulls on a puck with force 7 microN at an angle of 30?. Another flea pulls on the puck with force 2 microN at an angle of -60?.
The specific heat capacity of a material is 1150 J/(kg·°C). The temperature of 1.0 kg of this solid material is raised by 6.0°C. determine the change in the internal energy of the material
A 43.0-kg child swings in a swing supported by two chains, each 2.92 m long. The tension in each chain at the lowest point is 346 N. Find the child's speed at the lowest point
A diving bell with interior air pressure equal to atmospheric pressure is submerged in Lake Michigan. At what depth is the diving bell
A ball of clay weighing 0.5 kg is thrown at a pendulum bob at rest weighing 4-kg. What is the velocity of the pendulum bob
A laser beam passes through a single slit. We observe an interference pattern on a screen 9.03 m away. Find the width of the slit
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