Which sentence about an ocean current is correct? A) Upwelling is caused by winds that blow on the ocean's surface. B) Upwelling moves water horizontally. c) Surface currents are caused by differences in water density. D) Surface currents move vertically through the water.​

An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.