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never [62]
3 years ago
15

Cliff divers at Acapulco jump into the sea macias (fjm793) – Homework 3, 2d motion 19-20 – dowd – (WoffordWPHY11920 2) 4 from a

cliff 36.2 m high. At the level of the sea, a rock sticks out a horizontal distance of 11.98 m. The acceleration of gravity is 9.8 m/s 2 . With what minimum horizontal velocity must the cliff divers leave the top of the cliff if they are to miss the rock? Answer in units of m/s.
Physics
1 answer:
Stells [14]3 years ago
7 0

Answer:

v = 7.67 m/s

Explanation:

Given data:

horizontal distance 11.98 m

Acceleration due to gravity 9.8 m/s^2

Assuming initial velocity is zero

we know that

h = \frac{gt^2}{2}

solving for t

we have

t = \sqrt{\frac{2h}{g}}

substituing all value for time t

t = \sqrt{\frac{2\times 11.98}{9.8}}

t = 1.56 s

we know that speed is given as

v = \frac{d}{t}

v =\frac{11.98}{1.56}

v = 7.67 m/s

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Essay on the problems kenge will face going to college in the story seeing is believing
Ilia_Sergeevich [38]

Essay on the problems kenge will face going to college in the story seeing is believing is described below

Explanation:

1.An essay is really just a body of words meant to convey something. So, in your class, you used an essay to convey the pros and cons of love

2.In the admissions essays, you are using an essay to convey something about yourself. You will probably be asked to write about the reasons you want to enter a specific field or college, an event in your life that helped shape you, or other personal subjects. If it helps, rewrite these prompts into questions:

REAL examples

  • Why do you want to go to Harvard?
  • Why do you want to enter the medical field?
  • Are there any events in your life that affected your grades, but are not reflected in the rest of your application?

3.While the standard INTRO, BODY, CONCLUSION essay is widely used, it is not required. It is used because it is an effective way to convey information:.

  • INTRO: grabs reader's attention, tells the reader the main topic, gives necessary background information, and lists what is going to be expressed about the topic
  • BODY: one paragraph per idea about the main topic (eg 1 for pros, 1 for cons; OR 1 telling about an event in your life, 1 explaining how that event affected you, 1 giving an example of how you used what you learned in a new situation)
  • CONCLUSION: summarizes what you already told the reader, gives a broader context, and explains how the information is useful

4.To summarize: an essay is just a body of words that expresses an idea. There are many ways to write one, but having an introduction, paragraphs separated into ideas, and a conclusion helps make your idea easier to understand and more memorable.

6 0
3 years ago
A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface. Th
wolverine [178]

Answer:

Explanation:

easy way

when system is all kinetic energy, velocity is at a maximum

E = ½mv²

v = √(2E/m) = √(2(25)/0.5) = √100 = 10 m/s

harder way

ω = √(k/m) = √(80/0.5) = √160 rad/s

When the system is entirely spring potential, the amplitude A is

E = ½kA²

A = √(2E/k) = √(2(25)/80) = 0.790569... = 0.79 m

maximum velocity is ωΑ = 0.79√160 = 10 m/s

6 0
3 years ago
You are working at a company that manufactures electrical wire. Gold is the most ductile of all metals: it can be stretched into
devlian [24]

Answer:R=1.424 M\Omega

Explanation:

Given

mass of gold m=1.6 gm

Length of wire L=2.2 km

Resistivity of gold \rho =2.44\times 10^{-8}

density of gold =19.3\times 10^3 kg/m^3

and mass=volume\times density

1.6\times 10^{-3}=volume\times 19.3\times 10^3

volume=8.29\times 10^{-8} m^3

And Resistance R=\frac{\rho L}{A}

also be written as

R=\frac{\rho L^2}{V}

where L=length

V=volume

\rho =resistivity\ of\ gold

R=\frac{2.44\times 10^{-8}\times (2200)^2}{8.29 \times 10^{-8}}

R=1.42\times 10^{6} \Omega

R=1.424 M\Omega

5 0
3 years ago
A coin has a radius of 1.06 cm and a thickness of 1.2 mm. Find its<br><br> volume in m^3.
ANTONII [103]

Answer:

The volume of the coin is 4.236 x 10⁻⁷ m³

Explanation:

Given;

radius of a coin, r = 1.06 cm = 0.0106 m

thickness of the coin, h = 1.2 mm = 0.0012 m

The volume of the coin is given by;

volume = Area x thickness

Area of the coin = πr² = π (0.0106)² = 3.5304 x 10⁻⁴ m²

The volume of the coin = (3.5304 x 10⁻⁴ m²) x (0.0012 m)

The volume of the coin = 4.236 x 10⁻⁷ m³

Therefore, the volume of the coin is 4.236 x 10⁻⁷ m³

4 0
3 years ago
A sled drops 50 meters in height on a hill. The mass of the rider and sled is 70 kg and the sled is going 10 m/s at the bottom o
navik [9.2K]

Answer:

Efficiency = 10.2 %

Explanation:

Given the following data;

Mass = 70 kg

Height = 50 m

Velocity = 10 m/s

We know that acceleration due to gravity is equal to 9.8 m/s².

To find the efficiency of energy conversion from potential to kinetic;

First of all, we would determine the potential energy;

P.E = mgh

P.E = 70 * 9.8 * 50

P.E = 34300 J

For the kinetic energy;

K.E = ½mv²

K.E = ½ * 70 * 10²

K.E = 35 * 100

K.E = 3500

Therefore, Input energy, I = 34300 J

Output energy, O = 3500 J

Next, we find the efficiency;

Efficiency = O/I * 100

Substituting into the formula, we have;

Efficiency = 3500/34300 * 100

Efficiency = 0.1020 * 100

Efficiency = 10.2 %

4 0
3 years ago
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