answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
GalinKa
9 days ago
7

An astronaut on the moon throws a baseball upward. The astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 40

ft per sec. The height s of the ball in feet is given by the equation s equals negative 2.7 t squared plus 40 t plus 6.5s=−2.7t2+40t+6.5 , where t is the number of seconds after the ball was thrown. Complete parts a and b. a. After how many seconds is the ball 12 ft above the moon's surface?

Mathematics
1 answer:
lawyer [9.2K]9 days ago
6 0

Response:

0.14 s

Detailed breakdown:

s = -2.7 t² + 40t + 6.5

Set s = 12

12 = -2.7t² + 40t + 6.5     Rearranging yields

-2.7t² + 40t + 6.5 - 12 = 0

      -2.7t² + 40t - 5.5 = 0

Utilize the quadratic formula

x = \frac{-b\pm\sqrt{b^2-4ac}}{2a}

a = -2.7; b = 40; c = -5.5

x = \frac{-40\pm\sqrt{40^2 - 4\times (-2.7) \times (-5.5)}} {2(-2.7)}

x = \frac{-40\pm\sqrt{1600-59.4}}{-5.4}

x = \frac{-40\pm\sqrt{1540.6}}{-5.4}

x = \frac{-40\pm 39.25}{-5.4}

x = 7.41 ± 7.27

x₁ = 0.14; x₂ = 14.68

The graph indicates roots at x₁ = 0.134 and x₂ = 14.68.

The surface of the Moon stands at -12 ft. Thus, the ball will reach a height of 12 ft above the Moon’s surface (crossing the x-axis) at 0.14 s.

The second root indicates when the ball is again 12 ft above the lunar surface as it descends.

You might be interested in
The sum of two consecutive integers is one less than three times the smaller integer. Find the two integers
Inessa [9009]

The two integers are 2 and 3n+n+1=3n-1\\\\
2n+1=3n-1\\\\
3n-2n=1+1\\\\
n=2\\
n+1=3

4 0
6 days ago
Read 2 more answers
In △ABC , m∠A=53°,m∠B=17°, and a=27. Find the perimeter of the triangle.
lawyer [9248]
Utilizing the Law of Sines (sinA/a=sinB/b=sinC/c) and recognizing that the angles in a triangle add up to 180°.

The angle C calculates to 180-53-17=110°

Thus, we have 27/sin53=b/sin17=c/sin110

This leads to b=27sin17/sin53, c=27sin110/sin53

The perimeter is defined as a+b+c, so

p=27+27sin17/sin53+27sin110/sin53 units

p≈68.65 units (rounded to the nearest hundredth of a unit)
6 0
11 days ago
Using cell references, enter a formula in cell B6 to calculate monthly payments for the loan described in this worksheet. The an
Zina [9184]

Response:

Here is the solution to the question:

Detailed Steps:

The following steps will be followed in this task:

  • Step 1: Utilize the formulas tab on the sheet where you will apply the function found in the FLG "Function Library group".
  • Step 2: Click on the Financial button, then select PMT.
  • Step 3: After selecting PMT, input "B3/12" into the rate argument box.
  • Step 4: In B4, fill in the Nper argument box with the value found in cell "B2" for the Pv argument box.
  • Step 5: Click the OK button to finish.
5 0
1 month ago
The track team is trying to reduce their time for a relay race. First they reduce their time by 2.1 minutes. Then they are able
PIT_PIT [9132]
The initial time was 15.7 minutes.

Explanation of steps:

Let x represent the initial time (in minutes).

The relay team is working on minimizing their relay race duration.

First, they cut down their time by 2.1 minutes.

Afterwards, they manage to reduce that time by 10 percent.

If the concluding time ends up being 3.96 minutes, then

x-t1-t2= 3.6
x= 3.6+ t1+ t2
x= 3.6+ 2.1+ 10
x= 15.7

Thus, their starting time was 15.7 minutes.
3 0
16 days ago
Solve each of the following initial value problems and plot the solutions for several values of y0. Then describe in a few words
Inessa [9009]

Response:

Step-by-step clarification:

Reply:

a) y-8 = (y₀-8), b) 2y -5 = (2y₀-5)

Clarification:

To address these equations, using direct integration is the simplest approach.

a) The equation provided is

          dy / dt = -y + 8

         dy / (y-8) = dt

We substitute variables

          y-8 = u

         dy = du

Substituting and integrating gives us

           ∫ du / u = ∫ dt

           Ln (y-8) = t

Evaluating at the lower limits t = 0 for y = y₀

          ln (y-8) - ln (y₀-8) = t-0

Simplifying the equation results in

           ln (y-8 / y₀-8) = t

           y-8 / y₀-8 =

            y-8 = (y₀-8)

b) The equation here is

            dy / dt = 2y -5

            u = 2y -5

            du = 2 dy

            du / 2u = dt

Integrating now

             ½ Ln (2y-5) = t

Evaluating at limits gives

            ½ [ln (2y-5) - ln (2y₀-5)] = t

            Ln (2y-5 / 2y₀-5) = 2t

            2y -5 = (2y₀-5)

c) The equation here bears a strong resemblance to the previous one

             u = 2y -10

             du = 2 dy

             ∫ du / 2u = dt

             ln (2y-10) = 2t

We evaluate this to get

             ln (2y-10) –ln (2y₀-10) = 2t

               2y-10 = (2y₀-10)

4 0
12 days ago
Other questions:
  • For each object , choose an appropriate scale for drawing that fits on a regular sheet of paper . Not all scales on the list wil
    15·1 answer
  • How do I use an area model to explain the product of 4.6 and 3?
    10·2 answers
  • A high school theater club has 40 students, of whom 6 are left-handed. Two students from the club will be selected at random, on
    11·1 answer
  • 1. The cities of Dallas, Charleston, and Indianapolis form a triangle. The distance from Dallas to
    7·1 answer
  • Please enter the missing number: 2, 9, 20, 37, 64, 107, ?
    7·1 answer
  • How many sets of three integers between 1 and 20 are possible if no two consecutive integers are to be in a set?
    15·1 answer
  • A group of friends is attempting free throws on a basketball court. The table shows the number of attempts and the number of bas
    11·2 answers
  • A biologist estimates that 80% of the deer in a region carry a certain type of tick. for a sample of 300 deer selected at random
    6·1 answer
  • Sanjeet paid $32.85 for a file and 3 identical pens.Leon paid $83.50 for 2 such files and 8 such pens.Find the cost of 1 pen.
    5·1 answer
  • Anais bought 4 1/2 yards of ribbon. She had 3 feet 8 inches of ribbon left after trimming some curtains. How many inches of ribb
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!