a custodian pulls a vacuum 13.5 m with a 33.9 N force at a 55 degree angle, against a 14.1 N friction force. Find the work done by the custodian.

The dominant wavelength of energy emitted by the sun is

In which group is hydrogen located on the periodic table?

A ball has a diameter of 3.79 cm and average density of 0.0838 g/cm3. What force is required to hold it completely submerged under water?

A football quarterback throws a football. After it leaves his hand, what forces are acting on the football?

Which factor would reduce the size of a forest population A. Lots of nesting sites B. Easy availability of food C. Lack of mates D. Stable population numbers

Which of the following describes effort force?

What does the chemical formula CaCl2 show about the compound it represents? It is made up of one element. It is made up of two elements. It is made up of three elements. It is made up of four elements.

An electron with kinetic energy of 2000 eV (1 eV = 1.602 x 10-19 J) is fired horizontally across a horizontally oriented conducting plate with a surface charge density + 4.00 x 106 C/m2.

A vertebra is subjected to a shearing force of 535 N. Find the shear deformation, taking the vertebra to be a cylinder 3.00 cm high and 4.00 cm in diameter. The shear modulus for vertebrae is 8.00 * 1010 N/m2.

If radio waves cannot be reflected from the Sun, how can radar be used to find the distance from Earth to the Sun?