A 1150 kg automobile is at rest at a traffic signal. At the instant the light turns green, the automobile starts to move with a constant acceleration of 3.8 m/s2. At the same instant a 1900 kg truck, traveling at a constant speed of 7.4 m/s, overtakes and passes the automobile. (a) How far is the center of mass of the automobile-truck system from the traffic light at t = 3.9 s? (b) What is the speed of the center of mass of the automobile-truck system then

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

The space within which a test north pole experiences a force magnetic poles 2. a powerful stream of electrons flowing high above the earth in the ionosphere electrojet 3. a concept to explain the directional nature of a magnetic field field lines 4. coil of wire designed to produce a magnetic field by a current passing through its windings ionosphere 5. that region above the earth's atmosphere where particles exist in an ionized state magnetic field 6. the extremities of a magnet where the field lines tend to converge or concentrate aurora borealis 7. a phenomenon that occurs in the northern latitudes; the northern lights solenoid

In set c, explain the difference in the magnitudes of the gravitational forces between the two pairs of objects