Explain why you move forward and a boat moves backwards when you jump from a boat to a pier

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

Contrast the force of gravity between these pairs of objects a 1 kg mass and a 2 kg mass that are 1 m apart and two 2 kg masses that are 1 m apart

Order the sequence of ideas that lead to marie curies discovery of radioactive elements number the events in chronological order starting with the oldest