We read your photo as:

Evaluate integral12 (3x3 + 2x2 - x + 1)\,dx.

Mathematics

ScanSolve AI Answer

Answers

3 parts
1

18512\frac{185}{12}

i

3380N3380 \text{N}

ii

90m90 \text{m}

Step-by-step solution

7 steps

Here are the solutions to questions 1 and 2.

Part 1· 3 steps

(b)

Evaluate ∫12(3x3+2x2−x+1) dx\int_{1}^{2} (3x^3 + 2x^2 - x + 1)\,dx.

  1. Find the indefinite integral of the function.

    ∫(3x3+2x2−x+1) dx=3x3+13+1+2x2+12+1−x1+11+1+x+C\int (3x^3 + 2x^2 - x + 1)\,dx = \frac{3x^{3+1}}{3+1} + \frac{2x^{2+1}}{2+1} - \frac{x^{1+1}}{1+1} + x + C =34x4+23x3−12x2+x+C= \frac{3}{4}x^4 + \frac{2}{3}x^3 - \frac{1}{2}x^2 + x + C
  2. Evaluate the definite integral using the Fundamental Theorem of Calculus, F(b)−F(a)F(b) - F(a).

    [34x4+23x3−12x2+x]12\left[ \frac{3}{4}x^4 + \frac{2}{3}x^3 - \frac{1}{2}x^2 + x \right]_{1}^{2}

    First, evaluate at the upper limit x=2x=2:

    F(2)=34(2)4+23(2)3−12(2)2+2F(2) = \frac{3}{4}(2)^4 + \frac{2}{3}(2)^3 - \frac{1}{2}(2)^2 + 2 F(2)=34(16)+23(8)−12(4)+2F(2) = \frac{3}{4}(16) + \frac{2}{3}(8) - \frac{1}{2}(4) + 2 F(2)=12+163−2+2F(2) = 12 + \frac{16}{3} - 2 + 2 F(2)=12+163=363+163=523F(2) = 12 + \frac{16}{3} = \frac{36}{3} + \frac{16}{3} = \frac{52}{3}

    Next, evaluate at the lower limit x=1x=1:

    F(1)=34(1)4+23(1)3−12(1)2+1F(1) = \frac{3}{4}(1)^4 + \frac{2}{3}(1)^3 - \frac{1}{2}(1)^2 + 1 F(1)=34+23−12+1F(1) = \frac{3}{4} + \frac{2}{3} - \frac{1}{2} + 1

    Find a common denominator, which is 12:

    F(1)=912+812−612+1212F(1) = \frac{9}{12} + \frac{8}{12} - \frac{6}{12} + \frac{12}{12} F(1)=9+8−6+1212=2312F(1) = \frac{9 + 8 - 6 + 12}{12} = \frac{23}{12}
  3. Subtract F(1)F(1) from F(2)F(2).

    ∫12(3x3+2x2−x+1) dx=F(2)−F(1)=523−2312\int_{1}^{2} (3x^3 + 2x^2 - x + 1)\,dx = F(2) - F(1) = \frac{52}{3} - \frac{23}{12} =52×43×4−2312=20812−2312= \frac{52 \times 4}{3 \times 4} - \frac{23}{12} = \frac{208}{12} - \frac{23}{12} =208−2312=18512= \frac{208 - 23}{12} = \frac{185}{12}

    The final answer is 18512\boxed{\frac{185}{12}}.

Part 2

(5)

A car with a mass of 1600kg1600 \text{kg} starts from rest and accelerates to a speed of 18m/s18 \text{m/s} in 10seconds10 \text{seconds}. The frictional force is 500N500 \text{N}.

Part i

3380N3380 \text{N}

calculate the force required to accelerate the car

  1. Identify the given values and calculate the acceleration.

    Given:
    Mass (mm) = 1600kg1600 \text{kg}
    Initial velocity (uu) = 0m/s0 \text{m/s} (starts from rest)
    Final velocity (vv) = 18m/s18 \text{m/s}
    Time (tt) = 10s10 \text{s}
    Frictional force (FfF_f) = 500N500 \text{N}

    Using the kinematic equation v=u+atv = u + at:

    18m/s=0m/s+a×10s18 \text{m/s} = 0 \text{m/s} + a \times 10 \text{s} 18=10a18 = 10a a=1810m/s2=1.8m/s2a = \frac{18}{10} \text{m/s}^2 = 1.8 \text{m/s}^2
  2. Calculate the net force (FnetF_{net}) required for acceleration using Newton's second law (Fnet=maF_{net} = ma).

    Fnet=1600kg×1.8m/s2F_{net} = 1600 \text{kg} \times 1.8 \text{m/s}^2 Fnet=2880NF_{net} = 2880 \text{N}
  3. Calculate the total applied force (FappliedF_{applied}) needed to overcome friction and cause acceleration.

    The net force is the applied force minus the frictional force (Fnet=Fapplied−FfF_{net} = F_{applied} - F_f).

    Fapplied=Fnet+FfF_{applied} = F_{net} + F_f Fapplied=2880N+500NF_{applied} = 2880 \text{N} + 500 \text{N} Fapplied=3380NF_{applied} = 3380 \text{N}

    The force required to accelerate the car is 3380N\boxed{3380 \text{N}}.

Part ii

90m90 \text{m}

find the distance traveled within the time.

  1. Use a kinematic equation to find the distance (ss).

    Using the equation s=ut+12at2s = ut + \frac{1}{2}at^2:

    s=(0m/s)(10s)+12(1.8m/s2)(10s)2s = (0 \text{m/s})(10 \text{s}) + \frac{1}{2}(1.8 \text{m/s}^2)(10 \text{s})^2 s=0+12(1.8)(100)s = 0 + \frac{1}{2}(1.8)(100) s=0.9×100s = 0.9 \times 100 s=90ms = 90 \text{m}

    The distance traveled is 90m\boxed{90 \text{m}}.

Was this helpful?

Try one yourself

A new problem that tests the same skill.

Still stuck on this one?

Ask a follow-up, and the answer starts from this question.

Got a different question?Ask your own question
Handwritten step-by-step solution preview

Handwritten Step-by-Step Solution

Get this as a handwritten image on WhatsApp — like a tutor wrote it for you.

Try on WhatsApp