In 1874, a swarm of locusts descended on Nebraska. The swarm's mass was estimated to be 2.5 x 1010 kg. If this swarm were split in half and the halves
separated by 1.0 x 108 m, what would the magnitude of the gravitational force
between the halves be?

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.