Acircular disk slides in the +x direction on a frictionless horizontal surface. it collides with an identical disk that is at rest before the collision. disk 1 goes off at an angle of 60o with respect to the x-direction. disk 2 goes off at an angle of 30o with respect to the x-direction. 1)which of the following statements best describes the speeds of the disks after the collision? show your work, explain 4.diskihasthegreater kineticenergya tert ecollison lidisk 2 has the greater kinetic energy after the collision. ill. the kinetic energies of the two disks are equal after the collision ド⅓»: 宀 b) find the speed of disk 2 2 (c) find the sum of the kinetic energies of disk 1 and disk 2 after the collision (d) the distance between a carbon atom (mc 12 u) and an oxygen atom (mo 16 u) in the co molecule is 3.50 x 1010 m. how far from the carbon atom is the center of mass of the molecule? (hint in the co molecule, the oxygen and carbon atoms are located on the same axis direction. co is a linear molecule.) (extra credit- 5pts)

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?

Which lists the fundamental forces in order, from strongest to weakest? strong nuclear, weak nuclear, electromagnetic, gravitational strong nuclear, electromagnetic, weak nuclear, gravitational gravitational, weak nuclear, electromagnetic, strong nuclear electromagnetic, gravitational, strong nuclear, weak nuclear