What allows a tightrope walker to walk across the rope?
tension
air resistance
friction
magnetic force
isabella pushes a box with a force of 20 n. it accelerates at 2 m/s/s. what is the mass of the box?
10 kg
40 kg
22 kg
cannot be determined

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

How many atoms of nitrogen are in the chemical formula ni(w on

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?