1. An automobile traveling at 25 km/hour has kinetic energy equal to 1x 10^4J. a What is the mass of the car?

b. If the velocity of the car is increased to 45 km/hour, what is its kinetic energy?

c. If the velocity is increased to 80 km/hour, what is its kinetic energy?

The basketball coach tells his team to run sprints back and forth across the court, which is 30 m long. they start at the left end of the court, run back and forth 6 times, then end back at the left end of the court where they began. what distance did they run? what is their displacement?

Aperson walks 7 feet east stops and walks 7 feet west

The earth's magnetic field, with a magnetic dipole moment of 8.0×1022am2, is generated by currents within the molten iron of the earth's outer core. suppose we model the core current as a 3000-km-diameter current loop made from a 1000-km-diameter “wire.” the loop diameter is measured from the centers of this very fat wire. to decide whether this is a large or a small current density, compare it to the current density of a 7.0 a current in a 2.0-mm-diameter wire.