13. ball of clay with mass 0.100 kg directly dropped from 1.50 m above the ground. (a) what is the
speed of the clay ball just before it hits the ground? (b) if the clay ball stick to the floor after hitting
the ground in 0.00250 s, calculate the force on the clay by the floor. (ignore the gravity) (c) what is
the force created on the ground by the clay ball? (ignore the gravity) (d) why is the force of gravity
not that important for part b and c? (e) calculate the impulse on the ball (f) calculate the impulse on
the ground.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked