A 0.77 kg spike is hammered into a railroad
tie. The initial speed of the spike is equal to
3.5 m/s.
If the tie and spike together absorb 88.3
percent of the spike’s initial kinetic energy
as internal energy, calculate the increase in
internal energy of the tie and spike.
Answer in units of J.

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon

Energy flows from the producer level to the level. is called

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.