A student hits a hockey puck with a hockey stick and the puck speeds up. Another student claims that the student broke the Law of Conservation of Momentum
because the puck gained momentum. Which of the following is the best
explanation of why the Law is not broken in this closed system?
The Law of Conservation of Momentum only applies for objects of equal mass.
The momentum of the puck is the same before and after the hockey stick hits
the puck.
The hockey stick loses as much momentum as the puck gained.
The force on the puck cancels the force on the hockey stick because the forces
are equal and opposite.

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.

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

The dot diagram represents the motion of the motorcycle as it moves from left to right