c): Range d): velocity and direction of the motion at a height of 130 meters

Physics

ScanSolve AI Answer

Answers

2 parts
c

3395 m\text{3395 m}

d

189.39 m/s\text{189.39 m/s}

26.35∘ above the horizontal\text{26.35}^\circ \text{ above the horizontal}

26.35∘ below the horizontal\text{26.35}^\circ \text{ below the horizontal}

Step 1: Identify the given values and formulas.
Given:
Initial velocity, u=196 m/su = 196 \text{ m/s}
Angle of projection, θ=30∘\theta = 30^\circ
Acceleration due to gravity, g=9.8 m/s2g = 9.8 \text{ m/s}^2

c) Calculate the Range.
The formula for the horizontal range (RR) is:

R=u2sin⁡(2θ)gR = \frac{u^2 \sin(2\theta)}{g}

Substitute the given values:

R=(196 m/s)2sin⁡(2×30∘)9.8 m/s2R = \frac{(196 \text{ m/s})^2 \sin(2 \times 30^\circ)}{9.8 \text{ m/s}^2} R=(196 m/s)2sin⁡(60∘)9.8 m/s2R = \frac{(196 \text{ m/s})^2 \sin(60^\circ)}{9.8 \text{ m/s}^2} R=38416 m2/s2×329.8 m/s2R = \frac{38416 \text{ m}^2/\text{s}^2 \times \frac{\sqrt{3}}{2}}{9.8 \text{ m/s}^2} R=38416×0.8660259.8 mR = \frac{38416 \times 0.866025}{9.8} \text{ m} R=33269.969.8 mR = \frac{33269.96}{9.8} \text{ m} R≈3394.89 mR \approx 3394.89 \text{ m}

The range is 3395 m\boxed{\text{3395 m}}.

d) Calculate the velocity and direction of the motion at a height of 130 meters.
First, find the horizontal and vertical components of the initial velocity:
Horizontal component: ux=ucos⁡θ=196cos⁡30∘=196×32=983 m/su_x = u \cos \theta = 196 \cos 30^\circ = 196 \times \frac{\sqrt{3}}{2} = 98\sqrt{3} \text{ m/s}
Vertical component: uy=usin⁡θ=196sin⁡30∘=196×0.5=98 m/su_y = u \sin \theta = 196 \sin 30^\circ = 196 \times 0.5 = 98 \text{ m/s}

The horizontal velocity (vxv_x) remains constant throughout the flight:

vx=ux=983 m/s≈169.71 m/sv_x = u_x = 98\sqrt{3} \text{ m/s} \approx 169.71 \text{ m/s}

To find the vertical velocity (vyv_y) at a height h=130 mh = 130 \text{ m}, use the kinematic equation:

vy2=uy2−2ghv_y^2 = u_y^2 - 2gh vy2=(98 m/s)2−2×9.8 m/s2×130 mv_y^2 = (98 \text{ m/s})^2 - 2 \times 9.8 \text{ m/s}^2 \times 130 \text{ m} vy2=9604 m2/s2−2548 m2/s2v_y^2 = 9604 \text{ m}^2/\text{s}^2 - 2548 \text{ m}^2/\text{s}^2 vy2=7056 m2/s2v_y^2 = 7056 \text{ m}^2/\text{s}^2 vy=±7056 m/sv_y = \pm \sqrt{7056} \text{ m/s} vy=±84 m/sv_y = \pm 84 \text{ m/s}

The positive value corresponds to the particle moving upwards, and the negative value corresponds to it moving downwards.

The magnitude of the velocity (vv) at this height is:

v=vx2+vy2v = \sqrt{v_x^2 + v_y^2} v=(983 m/s)2+(±84 m/s)2v = \sqrt{(98\sqrt{3} \text{ m/s})^2 + (\pm 84 \text{ m/s})^2} v=(9604×3)+7056 m/sv = \sqrt{(9604 \times 3) + 7056} \text{ m/s} v=28812+7056 m/sv = \sqrt{28812 + 7056} \text{ m/s} v=35868 m/sv = \sqrt{35868} \text{ m/s} v≈189.39 m/sv \approx 189.39 \text{ m/s}

The magnitude of the velocity is 189.39 m/s\boxed{\text{189.39 m/s}}.

The direction of motion (α\alpha) is given by:

tan⁡α=vyvx\tan \alpha = \frac{v_y}{v_x}

If the particle is moving upwards (vy=84 m/sv_y = 84 \text{ m/s}):

tan⁡α=84 m/s983 m/s≈84169.71≈0.4950\tan \alpha = \frac{84 \text{ m/s}}{98\sqrt{3} \text{ m/s}} \approx \frac{84}{169.71} \approx 0.4950 α=arctan⁡(0.4950)≈26.35∘\alpha = \arctan(0.4950) \approx 26.35^\circ

The direction is 26.35∘ above the horizontal\boxed{\text{26.35}^\circ \text{ above the horizontal}}.

If the particle is moving downwards (vy=−84 m/sv_y = -84 \text{ m/s}):

tan⁡α=−84 m/s983 m/s≈−84169.71≈−0.4950\tan \alpha = \frac{-84 \text{ m/s}}{98\sqrt{3} \text{ m/s}} \approx \frac{-84}{169.71} \approx -0.4950 α=arctan⁡(−0.4950)≈−26.35∘\alpha = \arctan(-0.4950) \approx -26.35^\circ

The direction is 26.35∘ below the horizontal\boxed{\text{26.35}^\circ \text{ below the horizontal}}.

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