a 74 kg man jumps from a window 1.6 m above a sidewalk. the acceleration of gravity is 9.81 m/s 2 . a) what is his speed just before his feet strike the pavement? answer in units of m/s

Answers

Answer 1

Answer:

  5.60 m/s

Explanation:

His initial potential energy is equal to his final kinetic energy.

  mgh = 1/2mv^2

  2gh = v^2 . . . . . . . multiply by 2/m

  v = √(2gh) = √(2(9.81 m/s²)(1.6 m)) = √(31.392 m²/s²)

  v ≈ 5.60 m/s

_____

Additional comment

The mass is irrelevant in the equations we typically use for this purpose.


Related Questions

what is the difference between an asteroid and a meteoroid

Answers

Answer:

Asteroids smaller than planets and meteroids are small piece of an asteroid burns up upon enetering Earths atmosphere

PLEASE HELP!!
5. A 700 kg race car travels
around the track at 65 m/s. The track has a radius of 75 m.

a. What is the centripetal acceleration?

b. What is the centripetal force?

c. Is the net force on the car less than, equal to, or greater than the centripetal force? Why?

Answers

Hi there!

a.

The equation for centripetal acceleration is as follows:

[tex]\large\boxed{a_c = \frac{v^2}{r}}}[/tex]

Plug in the given values to solve:

[tex]\large\boxed{a_c = \frac{(65)^2}{75} = 56.33 m/s^2}[/tex]

b.

According to Newton's Second Law:

[tex]\large\boxed{\Sigma F = ma}}[/tex]

The acceleration is v²/r, so the net force is:

[tex]\large\boxed{\Sigma F = m(\frac{v^2}{r})}}[/tex]

Multiply by the given mass:

[tex]\large\boxed{\Sigma F = 700(56.33) = 39433.33 N}}[/tex]

c.

There is NO net force in the vertical direction since the object is NOT accelerating in the vertical direction (normal force and weight cancel).

Thus, the ONLY net force experienced by the object is in the horizontal direction and is EQUAL to the centripetal force.

A 0.24 kg mass with a speed of 0.60 m/s has a head-on collision with a 0.26 kg mass that is traveling in the opposite direction at a speed of 0.20 m/s. Assuming that the collision is perfectly inelastic, what is the final speed of the combined masses?

Answers

The  final speed of the combined masses is 0.186m/s

According to the law of collision, the sum of the momentum of the bodies before the collision is equal to the momentum after the collision.

Mathematically;

m1u1 - m2u2 = (m1+m1)v

v is the final speed of the combined masses.

Substituting the given parameters;

0.24(0.6) - 0.26(0.2) = (0.24+0.26)v

0.144 - 0.052 = 0.5v

0.092 = 0.5v

v = 0.092/0.5

v = 0.184m/s

Hence the final speed of the combined masses is 0.186m/s

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ignoring air resistance, an object falling toward the surface of the earth has a velocity that is

Answers

your answer would be 9.18 m/s^2

how to find time with acceleration and velocity

Answers

final velocity minus initial velocity

then divide by acceleration

Recoil is noticeable if you throw a heavy ball while standing on roller skates. If instead you go through the motions of throwing the ball but hold onto it, your net recoil velocity will be

Answers

Answer:

Since there is no external force, there is no change (movement) in the center of mass. Internally, the center of mass might change position, but the external result is still zero net velocity.

The net recoil velocity must be zero.

If the energy in a mechanical wave increases or decreases, what is also going to increase or decrease? A wavelength B amplitude с frequency d refraction​

Answers

Answer:

i think wave lengh not 100% sure tho

If the energy of the mechanical wave will increase or decrease, then the wavelength will also change accordingly. Hence, option A is correct.

What is Wavelength?

The distance between two identical locations (adjacent crests) in successive cycles is known as the wavelength, and it is used to describe waveform signals that are transmitted over wires or into space. Typically, in wireless systems, this length is specified in meters (m), centimeters (cm), or millimeters (mm). The wavelength is more frequently described in nanometers (nm), which are units of 10⁻⁹ m, or angstroms, which are units of 10⁻¹⁰ m, for infrared (IR), visible light (UV), and gamma radiation.

Frequency, which is defined as the number of wave cycles per second, and wavelength have an inverse relationship. The wavelength of a signal decreases with increasing frequency, or we can say that wavelength and refractive index are inversely proportional to each other.

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A 100 g mass of tungsten at 100.0°C is placed in 200 g of water at 20.0°C. The
mixture reaches equilibrium at 21.6°C. Calculate the specific heat of tungsten

Answers

ok so basically

If you,
q= 100g x 4.186 j/g*degrees C * (21.6 degrees C- 20.0 degrees C) which equals to 1.6.

So q= 100g * 4.186 j/g*deg C * 1.6

The specific heat capacity of tungsten given the data from the question is 0.17 J/gºC

Data obtained from the question

Mass of tungsten (M) = 100 g

Temperature of tungsten (T) = 100 °C

Mass of water (Mᵥᵥ) = 200 g

Temperature warm water (Tᵥᵥ) = 20 °C

Specific heat capacity of the water (Cᵥᵥ) = 4.184 J/gºC

Equilibrium temperature (Tₑ) = 21.6 °C

Specific heat capacity of tungsten (C) = ?

How to determine the specific heat capacity of tungsten

Heat loss = Heat gain

MC(T – Tₑ) = MᵥᵥCᵥᵥ(Tₑ – Tᵥᵥ)

100 × C × (100 – 21.6) = 200 × 4.184(21.6 – 20)

100 × C × 78.4 = 1338.88

Divide both sides by 100 × 78.4

C = 1338.88 / (100 × 78.4 )

C = 0.17 J/gºC

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. A teacher pushes a desk across the floor for a distance of 5 meters. She exerted a horizontal force of 20N. How much work was done?

Answers

Force (F) = 20 NDistance (s) = 5 mAngle between the force and distance (Θ) = 0°We know, work done = Fs Cos ΘTherefore, the work done by the teacher = (20 × 5 × Cos 0°) J = (20 × 5 × 1) J = 100 J

Answer:

100 J work was done.

Hope you could get an idea from here.

Doubt clarification - use comment section.

the breaks on a 15,680 N car exert a stopping force of 640 N.

Answers

The brakes on a 15,680 N car exert a stopping force of 640 N. The car's velocity changes from 20.0 m/s to 0 m/s.

when did humans learn that the earth is not the center of the universe?

Answers

Answer:

When did humans learn that the Earth is not the center of the universe?

Answer

1

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4 Answers

Asked in 3 Spaces

Science - Next Generation

Alexander Somm

, Consultant, Investor Relations at Novelpharm AG (2015-present)

Answered Oct 16

What, it isn’t?!

Sorry, I had to.

As far as I have read and understood, the Sumerians and later the Babylonians both had astronomical calendars that already differentiated planets and stars. Earth was not the center to them, the Sun likely was. That was around 2,200 - 1,600 BC.

After that, Greek philosopher Aristarchus of Samos (310 - 230 BC) was the first (recorded) to have believed the solar system was organized around the Sun, rather than the Earth. His heliocentric model was unpopular during Aristarchus’ lifetime, although it would inspire astronomers centuries later, such as Copernicus and Galileo.

Now, there are numerous archeological findings (cave paintings) and studies, that all suggest an understanding of complex astronomy in prehistoric times dating back as far as 40,000 years. This also explains how early, prehistoric migrants may have navigated the seas.

Explanation:

hope it helps

have a good day

Forces are needed to make a car do which of these?

slow down

speed up

stay on the ground

all of the above

Answers

all of the above.

if your car is on a steep hill it needs force to stop moving and to speed up

Which action will cause the tennis ball to move the farthest?

You gently hit the tennis ball.

You pull the tennis racket back and up and hit the ball hard as you swing down.

You hit the tennis ball from another side to change its direction.

You tap the tennis ball lightly.

Answers

Answer:

2nd option at the most

Explanation:

leave a thanks if helped

Something has a mass of 40 kg and a velocity of 1 m/s


How much kinetic energy does it have?

Part 2: If it doubles its mass, will its KE also double?

Answers

m=40kgv=1m/s

[tex]\\ \sf\Rrightarrow K.E=\dfrac{1}{2}mv^2[/tex]

[tex]\\ \sf\Rrightarrow K.E=\dfrac{1}{2}(40)(1)^2[/tex]

[tex]\\ \sf\Rrightarrow K.E=20J[/tex]

Part 2:-m=80kg

[tex]\\ \sf\Rrightarrow K.E=\dfrac{1}{2}(80)(1)^2[/tex]

[tex]\\ \sf\Rrightarrow K.E=40J[/tex]

Yes

Describe the direction in which each object will accelerate. If the object won't accelerate, write "no acceleration." Explain what might be happening to each object in terms of its overall motion.

Answers

Answer:

No acceleration. All of the forces are acting equally on the paper air plane therfore It isn't going to move any where.

Which statement describes the magnetic field inside a bar magnet? It points from north to south. It points from south to north. It forms loops inside the magnet. There is no field within the magnet.

Answers

Inside the bar magnet, the magnetic field points from north to south. Statement A is correct.

Magnetic Field:

It is defined as a vector field or the influence of the magnet on the electric current, charges and ferromagnetic substance.

The strength of magnetic field is depends up on the numbers of magnetic field lines per unit area.

Magnetic field lines emerge from the North pole and end in the South pole of a bar magnet. Inside the magnet are also present inside the bar magnet and never intersect at any point.

Therefore, inside the bar magnet, the magnetic field points from north to south.

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Answer:b

Explanation:

A bike accelerates uniformly from rest to a speed of 7.10 m/s over a distance of 35.4 m. Determine the acceleration of the bike.

Answers

So acceleration of the bike which started from rest, reaches at speed of 7.10 m/s by travelling distance 35.4 m will be 0.712 m/ sec^2.

Both igneous and sedimentary rock can become metamorphic rock if enough ________________ are applied.

Answers

Enough heat and pressure
I hope this helps.

The Earth currently has an orbital period of 1 year and a semi-major
axis length of 1 AU. If the Earth's orbit changed and the semi-major
axis length increased to 1.1 AU, how would the Earth's orbital period change?

A: It would increase by 0.15 years

B: It would increase by 0.032 years

C: It would decrease by 0.15 years

D: It would decrease by 0.032 years

Answers

The Earth's orbital period change is A: It would increase by 0.15 years

Using Kepler's third law which states that the square of the orbital period of the planet is directly proportional to the cube of its distance from the sun.

So, T² ∝ R³

T'²/T² = R'³/R³ where

T = orbital period at R = 1 yearR = initial axis length = 1 AUT' = orbital period at R'R' = final axis length = 1.1 AU.

So, making T' subject of the formula, we have

T' = [√(R'/R)³]T

T' = [√(1.1 AU/1 AU)³] × 1 year

T' = [√(1.1)³] × 1 year

T' = √1.331 × 1 year

T' = 1.15 × 1 year

T' = 1.15 years.

So, the change in the Earth's orbital period ΔT = T' - T

= 1.15 years - 1 year

= 0.15 years

Since this is positive, the orbital period increases by 0.15 years.

So, the Earth's orbital period change is A: It would increase by 0.15 years

Learn more about Kepler's third law here:

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anyone to help with this question​

Answers

Answer:

i can

Explanation:

i know what's the answer

In which of these states is the age of consent 18 years old?
WA
16
MT
16
ME
16
OR
18
MA16
ID
18
WY
18
NV
16
RI 16
CT 16
NJ 16
DE 18
MD 16
UT
18
CA
18
16 W
NH
ND
VT 16
18
MN
16
SD
16
WI
NY
16
18
MI
17
16
NE
IA
PA
17
16
OH 16
IL IN
17 16
KS
MO
16
16 17 KY 16
18
NC
OK
TN 18
16
AR
SC
16
AL
16
MS
GA
16
LA
16
TX
16
17
17
FL
18
СО
17
16
AZ
18
NM
17
HI
16
AK
16
Age 16
Age 17
Age 18
A. North Carolina
B. Florida

Answers

Answer:

all the ones that say

Explanation:

18.....

North Carolina is one of the states is the age of consent 18 years old. Hence option A is correct.

What is states ?

A state is a type of centralised political entity that establishes and upholds laws over a population within a given region. A state's definition is open to debate. Although alternative definitions are widespread, the German sociologist Max Weber's is the most generally used: a "state" is a polity that retains a monopoly on the legal use of violence. Statelessness societies like the Haudenosaunee Confederacy, which "do not have either purely or even primarily political institutions or roles," are examples of societies in which the lack of a state does not prohibit the existence of a community. A state's degree of governance, which is used to assess its success or failure, is thought of as the core component of modern states.

Hence option A is correct.

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If the forces acting on an object at rest are ______,the object will remain at rest.

Answers

Answer:

friction. or gravity both ofbthem .....................

..

A water balloon is launched with a speed of 40 m/s at an angle of 60 degrees to the horizontal. What is the vertical component of the velocity?

a 40 m/s
b 34.6 m/s
c 0 m/s
d 20 m/s

Answers

Vertical component = 40 m/s x sin(60) = 34.6 m/s

Answer: b. 34.6 m/s

what is the meaning of " hi baby girl "

Answers

Explanation:

it's mean hI small little cute baby girl ...

A block of mass 1.0 kg rests on a trolley of mass 4.0 kg. The coefficient of dynamic friction between the block and the trolley is 0.30. A horizontal force f = 5.0 n acts on the block. The block slides over the trolley. What is the acceleration of the trolley?

Answers

Answer:

the acceleration of the trolley is the acceleration of the trolley is 0.75 m/s^-2

Explanation:

friction force between the block and the trolley

= 1×0.3×9.8

= 2.94 N

(F = ma)

the acceleration of the trolley

= friction force/mass

= 2.94/4

= 0.735 m/s^-2

= 0.75 m/s^-2

The acceleration of the trolley will be 0.75 m/s².Acceleration is the ratio of the force to the mass.

What is the friction force?

It is a type of opposition force acting on the surface of the body that tries to oppose the motion of the body. its unit is Newton (N).

Mathematically it is defined as the product of the coefficient of friction and normal reaction.

The friction force between the block and the trolley is found as;

[tex]\rm F_f = \mu N \\\\ \rm F_f = \mu \times mg \\\\ \rm F_f = 0.30 \times 1 \timess 9.81 \\\\ \rm F_f= 2.94 \ N[/tex]

Mechanical force is equal to the product of the mass and the acceleration which is equal to the frictional force;

[tex]\rm F_f =F=ma \\\\ \rm a = \frac{F}{m} \\\\ \rm a = \frac{2.94}{4} \\\\ a=0.735 \ ms^{-2}[/tex]

Hence the acceleration of the trolley will be 0.75 m/s².Acceleration is the ratio of the force to the mass.

To learn more about the friction force refer to the link;

https://brainly.com/question/1714663

As best you can, describe how we can tell the age of the Earth and rocks found on it.

Answers

Answer:

We can determine the age of the Earth and the rocks found on Earth with techniques such as measuring ice cores and digging and analysing fossils.

Explanation:

Hopefully this helped!

Help it’s multiple choice 11 through 15 please!

Answers

1. • Here, force of gravity on the block = 20 N.

• Therefore, the normal force will also be the same, i.e., 20 N [According to Newton's Third Law, on every action, there is an equal and opposite reaction]

• The coefficient

[tex] u_{k} = 0.4[/tex]

• Force of friction =

[tex]u_{k} \times \: normal \: \: \: force \\ = 0.4 \times 20N \\ = 8N[/tex]

• Hence, the force of sliding friction between the block and the ground is 8 N.

• So, it is option c. 8 N

2. The answer is option d. continue in the same direction with no change in speed.

We know, force = mass × acceleration. When force is 0, then acceleration will also be 0 since mass cannot be 0. So, there will be no change in speed.

3. It is option b. force that is required to give a one kilogram object the acceleration of 1 m/s^2.

Newton is the SI unit of force. As mentioned earlier, force = mass × acceleration. The SI unit of mass and acceleration is Kg and m/s^2 respectively.

So, 1 N = 1 Kg × 1 m/s^2.

4. It is d. not zero.

Acceleration is the change in speed. So, if the force is zero, then acceleration will not occur.

5. Force = 2 N

Acceleration of the object A = 2 m/s^2.

Acceleration of the object B = 1 m/s^2.

Therefore, mass of the object A = 2 N ÷ 2 m/s^2 = 1 Kg

And, mass of the object B = 2 N ÷ 1 m/s^2 = 2 Kg

So, the mass of object B is greater than that of object A.

Hence, the answer is option c. Object B has more mass.

Hope you could get an idea from here.

Doubt clarification - use comment section.

1. Which of these is not a spherical mirror?
a) Concave mirror
b) Convex mirror
c) Plane mirror
d) None of these

Answers

Answer:

C.Plane mirror this is the answer of this question.

None of the above. That is option D.

A spherical mirror is defined as a mirror that has a surface that reflects curved rays. It is also called a curved mirror.

Types of spherical mirror include:

Concave mirror: This has a reflective surface that is curved inward and away from the light source. It reflects light inward to one focal point.

Example of concave mirror are Torch lights and automobile headlights.

Convex mirror: These are the spherical mirror that reflects light outwards and towards the light source.

Example of convex mirror is the magnifying glasses and telescopes.

Plane mirrors: This is a type of spherical mirror with a flat surface. Reflection of light occurs in plane mirror but it's center of curvature is infinite because it's flat.

Therefore, concave, convex and plane mirrors are all examples of a spherical mirror.

Learn more about plane mirrors here:

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Calcula el valor de la velocidad de las ondas sonoras en el agua sabiendo que su
densidad es 1.10 3 kg/m 3 y su módulo de comprensibilidad vale 2,16x10 9 N/m 2 ¿Cuál
es la longitud de onda de las ondas sonoras en el agua si su frecuencia es de 1000hz?

Answers

La velocidad de las ondas sonoras es aproximadamente 1469,694 metros por segundo. La longitud de onda de las ondas sonoras es 1,470 metros.

1) Inicialmente, debemos determinar la velocidad de las ondas sonoras a través del agua ([tex]v[/tex]), en metros por segundo:

[tex]v = \sqrt{\frac{K}{\rho} }[/tex] (1)

Donde:

[tex]K[/tex] - Módulo de compresibilidad, en newtons por metro cuadrado.[tex]\rho[/tex] - Densidad del agua, en kilogramos por metro cúbico.

Si sabemos que [tex]\rho = 1\times 10^{3}\,\frac{kg}{m^{3}}[/tex] y [tex]K = 2,16\times 10^{9}\,\frac{N}{m^{2}}[/tex], entonces la velocidad de las ondas sonoras es:

[tex]v = \sqrt{\frac{2,16\times 10^{9}\,\frac{N}{m^{2}}}{1\times 10^{3}\,\frac{kg}{m^{3}} } }[/tex]

[tex]v\approx 1469,694\,\frac{m}{s}[/tex]

La velocidad de las ondas sonoras es aproximadamente 1469,694 metros por segundo.

2) Luego, determinamos la longitud de onda ([tex]\lambda[/tex]), en metros, mediante la siguiente fórmula:

[tex]\lambda = \frac{v}{f}[/tex] (2)

Donde [tex]f[/tex] es la frecuencia de las ondas sonoras, en hertz.

Si sabemos que [tex]v\approx 1469,694\,\frac{m}{s}[/tex] y [tex]f = 1000\,hz[/tex], entonces la longitud de onda de las ondas sonoras es:

[tex]\lambda = \frac{1469,694\,\frac{m}{s} }{1000\,hz}[/tex]

[tex]\lambda = 1,470\,m[/tex]

La longitud de onda de las ondas sonoras es 1,470 metros.

Para aprender más sobre las ondas sonoras, invitamos a ver esta pregunta verificada: https://brainly.com/question/1070238

A 25 N force acts on a box moving along a plane at a distance of 20 meters. What is the work it does with this force?

Help!!​

Answers

Answer:

500 J.

Explanation:

Work done = force * distance

= 25 * 20

= 500 Joules.

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A hurricane hits the coast of the United States, destroying oyster farms. Afterward,oyster farmers have far fewer oysters to sell to stores and restaurants.What is this situation an example of?A. IncentiveB. DemandC. ScarcityD. Trade-off A dress which costs $180 is being sold at a discount of 10%. The amount of the discount is$1.80$10.00$18.00$170.00 can anyone pls help? Item 3Is this statement true or false?Hawaii was a territory of the United States for more than 50 years before becoming the 50th state.truefalse Suppose a varies jointly as b and c. Find a when b= 4 and c= -4 a= -60 when b= -5 and c= 4 Which new nation-states were formed in Europe during the 19th century? Which statement is true for teens? A- About 50% of your daily calories should come from calcium rich food B- Less than 10% of your daily calories should come from grains C- About 50% of your daily calories should come from protein D- No more than 25-35% of your daily calories should come from fat What traditional values shape the womens attitudes toward Nene? Check all that apply. The women befriend Nene because they value Nnaemeka. Nigerian fathers encourage their children to challenge tradition. Nenes value to them soars because of her homemaking skills. The women of Nnaemekas tribe are indifferent toward Nene. The women of Nnaemekas tribe do not accept Nene because she is an outsider. This is my book and that is yours.Identify the pronoun and it's kind Which statement best expresses the reason why the southern states decided to secede from the union after the election of 1860?. WILL GIVE BRAINLIEST HELP ASAP!! WILL ADD 5 STAR RATING !!! ANY AND ALL LINKS OR WRONG ANSWERS WILL BE REPORTED !!!! Can someone plss help me with this!!!QUESTION: Using specific examples, write 3 paragraphs of describing similarities and differences between the Columbian exchange and the exchanges that had taken place along the Silk Road trade routes of Eurasia. -Cristina, qu clase tienes en la primera hora? Why do you think Hester refused to name her lover and his identity whenasked by the Puritan society? In a drama script, camera directions are provided in order to explain what type of camera is needed. help directors make an actual play. make the actors look more experienced. tell the actors how to move or act. please help me asappppty :) in paragraph 2, why does the author mention a statistic- the number of people who have completed the journey Solve the system of equations2x - 9y =14x= -6y + 7 What is the boiling point of water at 2400 feet?Please help 20 points can some1 make a word problem for this equation0.5x + 4 16