A 65 kg man enters an elevator on the first floor of an apartment building. The elevator accelerates up at 2.0 m/s for 4.0 seconds, then moves at constant velocity for 15 seconds, then decelerates at a constant rate to a stop over the next 6.0 seconds. 1. What is the weight of the man?
2. What is the man's apparent weight for the first 4 seconds?
3. What is the man's apparent weight for the next 15 seconds?
4. What is the speed of the elevator when moving at a constant speed?
5. Determine the acceleration of the elevator for the last 6 seconds?
6. What is the man's apparent weight for the last 6 seconds?
7. What is the total distance the elevator moved?

Please Hurry

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?