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Question 1087912: Hello, I am having trouble answering two questions on projectiles using formulas: d=16t^2 where d=distance in feet that an object falls, in t seconds, regardless of weight. And, if a projectile is launched upward from the ground with an initial velocity of 73.5 m per second, neglecting air resistance, it's height, in meters, above the ground t seconds after projection is given by the formula: d= -4.9t^2+73.5t.
*After how many seconds will the projectile be 100 m above the ground? I took 100 and divided by 73.5 and got 1.36 seconds?
*How long will it take for the projectile to return to the ground? I converted the 100 m to 328.084 ft and used d=16t^2 to get 4.53 seconds? Could someone please tell me if these are correct? If not, could you please help me figure this out? Any help would be most appreciated! Thanks!
Click here to see answer by solver91311(24713)   |
Question 1087912: Hello, I am having trouble answering two questions on projectiles using formulas: d=16t^2 where d=distance in feet that an object falls, in t seconds, regardless of weight. And, if a projectile is launched upward from the ground with an initial velocity of 73.5 m per second, neglecting air resistance, it's height, in meters, above the ground t seconds after projection is given by the formula: d= -4.9t^2+73.5t.
*After how many seconds will the projectile be 100 m above the ground? I took 100 and divided by 73.5 and got 1.36 seconds?
*How long will it take for the projectile to return to the ground? I converted the 100 m to 328.084 ft and used d=16t^2 to get 4.53 seconds? Could someone please tell me if these are correct? If not, could you please help me figure this out? Any help would be most appreciated! Thanks!
Click here to see answer by ikleyn(52777)  |
Question 1087912: Hello, I am having trouble answering two questions on projectiles using formulas: d=16t^2 where d=distance in feet that an object falls, in t seconds, regardless of weight. And, if a projectile is launched upward from the ground with an initial velocity of 73.5 m per second, neglecting air resistance, it's height, in meters, above the ground t seconds after projection is given by the formula: d= -4.9t^2+73.5t.
*After how many seconds will the projectile be 100 m above the ground? I took 100 and divided by 73.5 and got 1.36 seconds?
*How long will it take for the projectile to return to the ground? I converted the 100 m to 328.084 ft and used d=16t^2 to get 4.53 seconds? Could someone please tell me if these are correct? If not, could you please help me figure this out? Any help would be most appreciated! Thanks!
Click here to see answer by josmiceli(19441)  |
Question 1087975: Two buoying 707 carrying each on board eight hundered passangers are in air from two destinations,Abuja to mombasa and capetown to adis ababa,ethiopia respectively.Their motion is represented by two equations below.
Y=2x+5 and y=4x+8 respectively.
Q 1:
By the use of line graph determine the point of probable accident.
Q2
Assuming that eacg plane is carrying a maximum of eight(800) hundred passangers,determine the number of passangers who survive in this fatal accident.
Click here to see answer by ikleyn(52777) |
Question 1088088: Need help with real world math problems?
For problems 7 – 8, use the Falling Object Model (Object is dropped not thrown) h = -16t2 + s where h = height, t = time (seconds) and s = initial height. In each problem below, remember, h = 0 when the object hits the ground!
7. You drop your keys from a window 30 feet above ground to your friend below. It will it take
______ seconds for the keys to reach the ground when your friend does not catch them,
8. An acorn falls 45 feet from the top of an oak tree. How long will it take to reach the ground? _____
Click here to see answer by jorel1380(3719)  |
Question 1088148: We can find some of the solutions of sin(x) = 0.6 graphically by graphing
y = sin(x) and y = .6
Estimate some of the solutions. (Let
−3π < x < 3π.
Enter your answers as a comma-separated list. Round your answers to four decimal places.)
x =
(supposed to be 6 answers for x)
Click here to see answer by Boreal(15235)  |
Question 1088225: help needed: Use graphical methods to solve the linear programming problem.
Minimize zequals=4xplus+5y subject to 2xminus−4yless than or equals≤10, 2xplus+ygreater than or equals≥15, xgreater than or equals≥0, and ygreater than or equals≥0.
Click here to see answer by Fombitz(32388)  |
Question 1088778: Myra uses an inverse variation function to model the data for the ordered pairs below.
(2, 30), (3, 20), (4, 15), (5, 12), (6, 10)
Which statement best explains whether an inverse variation function is the best model for the data?
A.) An inverse function is the best model because as x increases, y decreases.
B.) An inverse function is the best model because the products of corresponding x- and y-values are equal.
C.) An inverse variation function is not the best model because data points are closer to forming a straight line.
D.) An inverse variation function is not the best model because the data points show an exponential decay.
Click here to see answer by jim_thompson5910(35256) |
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