A wooden block of mass= 0.80kg is pulled along a rough horizontal surface with a force of 20N, the block experiences an acceleration of 5ms^-2. what is the magnitude of the frictional force?

Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

What can you increase the strength of an electromagnet by