The element boron (B, atomic number 5 and atomic mass 11) is right above aluminum (Al, atomic number 13 and atomic mass 27) in the periodic table. How many more electrons does aluminum have than boron? Why?

A stone is dropped from the top of a tower of height 44.1m. How long will it take to reach the ground?

Calculate the current in a circuit when the voltage of the circuit is 5 V and the circuit has a total resistance of 5 Ω.

An automobile with tires that have a radius of 0.260 m travels 76000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?

What of an object is given relative to an origin

On a part-time job, you are asked to bring a cylindrical iron rod of density 7800 kg/m3, length 84.5 cm and diameter 2.40 cm from a storage room to a machinist. Calculate the weight of the rod, w. Assume the free-fall acceleration is g = 9.80 m/s2.

What type of wave passes through the spring in the frog toy? Why?

Different kinds of substances have different properties of metals

Magma appears to be rising underneath the mid-oceanic ridges. a. True b. False

The energy required to crack a material

two punds of water vapor at 30 psia fill the 4ft3 left chmaber of a partitioned system. The right chmaber has twice the volume of the left and is initially evacuated.