A lead ball is dropped in a lake from a diving board 5.13 m above the water. it hits the water with a certain velocity and then sinks to the bottom with the same constant velocity. it reaches the bottom 3.90 s after it is dropped. (a) how deep is the lake? (b) what is […]
A fire hose ejects a stream of water at an angle of 39.5 ° above the horizontal. the water leaves the nozzle with a speed of 26.0 m/s. assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
A proton moves 2.00 cm parallel to a uniform electric field of 243 v/m. how much work is done by the field on the proton?
A student standing on the ground throws a ball straight up. the ball leaves the student’s hand with a speed of 6 m/s when the hand is 2.0 m above the ground. how long is the ball in the air before it hits the ground? (the student moves her hand out of the way.)
A spherical cavity is excised from the inside of the sphere. the cavity has radius a4 and is centered at position h⃗ , where |h⃗ |<34a, so that the entire cavity is contained within the larger sphere. find the electric field inside the cavity. an insulating sphere of radius a, centered at the origin, has […]
As a sailboat sails 59.0 m due north, a breeze exerts a constant force f with arrow1 on the boat’s sails. this force is directed at an angle west of due north. a force f with arrow2 of the same magnitude directed due north would do the same amount of work on the sailboat over […]
Does the amount of heat absorbed as 1 kg of saturated liquid water boils at 100°c have to be equal to the amount of heat released as 1 kg of saturated water vapor condenses at 100°c? why or why not?
Four point charges, each of magnitude 18.45 µc, are placed at the corners of a square 21.7 cm on a side. if three of the charges are positive and one is negative, find the magnitude of the force experienced by the negative charge. the value of coulomb’s constant is 8.98755 × 109 n · m […]
Consider a 0.2-mm diameter air bubble in a liquid. determine the pressure difference between the inside and outside of the air bubble if the surface tension at the air-liquid interface is
Calculate the process capability ratio (cp) for both the temperature and thickness variables. is the polymer-coating process able to meet the engineering standards 99.7% of the time? explain.
