Two slits are illuminated by a 363 nm light. the angle between the zeroth-order bright band at the center of the screen and the fourth-order bright band is 14.9 ◦ . if the screen is 170 cm from the double-slit, how far apart is this bright band from the central peak

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.

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)