A small metal sphere of radius 1 cm charged with +1.0 x 10-9 C is placed in contact with another sphere having a charge of 4.0 x 10-9 C and radius 4 cm. They are then separated by 10 cm. Find the
force between them.
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Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity

Farmer a has a deep well and needs a lot of water for her animals and crops. her neighbor, farmer b, has a shallower well. he needs less water than farmer a because his farm is smaller. in years of drought, sometimes farmer b can't get any water from his wells. what can farmer b do to decrease the likelihood of his well running dry?