Check the correctness of the term H equal 2 Sigma cos theta divided by r square DG

Rather than push a heavy box from one room to another, a worker chooses to place the box on a wheeled cart. In terms of friction, explain why moving the box on the wheeled cart is easier than pushing.

what is the best description for the orbit of a natural of a natural or artificial satellite around a planet? A. a parabola B. a circle C. irregular D. ellipsoid

If the fundamental frequecny of a musical instrument is 42 Hz, what is the frequency of the second harmonic

Which formula is used to calculate the mass of an object if the force and acceleration are known? a: m = Fa b: m = F/a c: m = a/F d: m = F - a

Which of the following events may occur when IR radiation is absorbed? Intra-molecular bond angles are changed. More intense IR absorptions occur for those bonds having greater dipole moment changes with bond lengthening in a vibration.

If two parallel light rays hit a plane mirror, what will be their orientation to one another after they reflect? a. they will remain parallel. b. they will be perpendicular. c. it depends on the initial spacing between the light rays. d.

To extend the electrical system between the main panel and the secondary panel, the electricians used A. Receptacles B. Circuit breakers. C. feeders. D. insulators

Men in the age of 18-34 years need to be able to run a marathon in 3 hours and 10 minutes to qualify for the Boston Marathon. How many seconds is this? Show your work.

What is the center of our solar system?

A - 4.0-µC charge is located 0.45 m to the left of a + 6.0-µC charge. What is the magnitude and direction (to the right or to the left) of the electrostatic force on the positive charge?