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In the Law of Conservation of Energy, why is it important that the system be "absent any external work input or output" for the law to hold true?
an electron in an x-ray machine is accelerated through a potential difference of 1.00 X 10^4 V, What is the kinetic energy of the electron
Write a nuclear reaction for the neutron-induced fission of U-235 to produce Te-137 and Zr-87 How many neutrons are produced in the reaction
a 1.0-m3 object floats in water with 20% of it above thewaterline. What does the object weight out of water
A certain freely falling object requires 1.6s to travel the last 38.00m before it hits the ground. From what height above the ground did it fall.
A baseball player hits a double and ends up on second base. A baseball "diamond" is a square, each side of length 27.4 m, with home plate and the three bases on the four corners. What is the magnitude of the player's displacement?
An atom of a particular isotope of cobalt has an atomic mass number of 59. The addition of two electrons would make this atom electrically neutral. What is the number of electrons
A 282 kg log is pulled up a ramp by means of the rope that is parallel to the surface of the ramp. The ramp is inclined at 23.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.87, and the log has..
A sphere of radius 3.09 cm and a spherical shell of radius 9.22 cm are rolling without slipping along the same floor. what should the ratio of the sphere\'s angular speed to the spherical shell\'s angular speed be
the potential difference between two parallel plates is 590 v. an alpha particle with mass of 6.64 10-27 kg and charge
A 18.3- cm focal-length lens is used to project 35- mm slidesonto a screen 4.17 m from the projector lens. What must be thewidth of the screen ( m) if the image of the slide is to just fillthe screen? The width of the image on the slide is 34.3 mm.
Angry Bird is launched at 20.87 degrees from a height of 18.81 cm at an initial speed of 6.19 m/s. From this information determine where the bird will land
bartender slides a beer mug at 1.2 m/s towards a customer at the end of a frictionless bar that is 1.3 m tall. What are the speed and direction of the mug at impact
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