A 15kg box is pushed on a table with 20 Newtons of force. A frictional force of 5N opposes the motion of the box.
15kg
a) What is the net force acting on the box?
b) What is the acceleration of the box across the table?
c) What is the velocity of the box after 4 seconds if it started at rest at time Os?
d) How far did the box travel during those 4 seconds?
e) Sketch the graphs for velocity vs time, and position vs time for the first 5 seconds the
box is moving.

What happens to atoms and chemical bonds during a reaction?

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?

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.