Which is true about surface waves? a)the disturbance is only parallel to the motion of the wave. b)the disturbance does not have a specific motion. c)the disturbance is in a circular motion. d)the disturbance is only perpedicular to the motion of the wave.

An object has a weight of 500 on earth what is the mass of this object

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)

What is the magnitude of the gravitational force acting on the earth due to the sun?