Ultrasound includes any sounds with wave frequencies greater than Hz. (Enter your answer in the numerical form
without commas or spaces)
Enter the answer

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.