Physics, 18.02.2020 04:26 krystenlitten
A playground is on the flat roof of a city school, 6.2m above the street below. The vertical wall of the building is h=7.30m high, forming a 1.1-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle of
θ
=53.0 degrees above the horizontal at a point d=24.0m from the base of the building wall. The ball takes 2.20s to reach a point vertically above the wall.
a) Find the speed at which the ball was launched. (Give your answer to two decimal places to reduce rounding errors in later parts.)
b) Find the vertical distance by which the ball clears the wall.
c) Find the horizontal distance from the wall to the point on the roof where the ball lands.
Answers: 1
Physics, 22.06.2019 02:00
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.
Answers: 1
Physics, 22.06.2019 23:00
According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring
Answers: 1
Physics, 22.06.2019 23:30
Which of the following forces require physical contact? tension air resistance friction magnetic force applied force
Answers: 3
A playground is on the flat roof of a city school, 6.2m above the street below. The vertical wall of...
English, 25.09.2019 19:20
English, 25.09.2019 19:20
English, 25.09.2019 19:20
English, 25.09.2019 19:20
English, 25.09.2019 19:20
English, 25.09.2019 19:20
History, 25.09.2019 19:20
Mathematics, 25.09.2019 19:20
English, 25.09.2019 19:20
English, 25.09.2019 19:20
Mathematics, 25.09.2019 19:20