1answer.
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
Crazy boy [7]
4 years ago
7

A baseball is seen to pass upward by a window with a vertical speed of 13 m/s . The ball was thrown by a person 19 m below on th

e street. a)What was its initial speed?
b)What altitude does it reach?
c)What time elapsed since it was thrown?
d)What time will it take the baseball to reach ground again, counting from the moment it passed the window upward?
Physics
1 answer:
sergejj [24]4 years ago
5 0

Answer:

a) v₀ =23.26 m/s

b) h= 27.6 m

c) t = 1.05 s

d) t₂= 3.69 s

Explanation:

We apply the free fall formulas:

vf= v₀+at Formula (1)

vf²=v₀²+2*a*y Formula (2)

y= v₀t+ (1/2)*a*t² Formula (3)

y:displacement in meters (m)  

v₀: initial speed in m/s  

vf: final speed in m/s  

a: acceleration in m/s²  

Data

vf= 13 m/s  

y= 19m

a=g= -9.8 m/s² = acceleration due to gravity

Problem development

a)What was its initial speed?

We apply the formula (2) for calculate initial speed (v₀):

vf²=v₀²+2*a*y Formula (2)

(13)²=v₀²+2*(-9.8)*(19)

v₀²= (13)²+372.4

v_{o} = \sqrt{(13)^{2}+372.4}

v₀ =23.26 m/s

b)What altitude does it reach?

At maximum height (h) , vf = 0

We apply the formula (2) for calculate initial speed (h)

vf²=v₀²+2*a*y Formula (2)

0 =( 23.26)²+(2)*(-9.8)*h

19.6*h = ( 23.26)²

h = ( 23.26)² / (19.6)

h= 27.6 m

c)What time elapsed since it was thrown?

We apply the formula (1) for calculate the time since the ball was thrown until it passes through the window

vf= v₀+a*t Formula (1)

13= 23.26+(-9.8)*t

(9.8)*t = 23.26 - 13

t= 10.26/9.8

t = 1.05 s

d)What time (t₂) will it take the baseball to reach ground again, counting from the moment it passed the window upward?

We calculate the time (t) it takes for the ball to reach the maximum height since it is thrown with formula (1)

vf= v₀+a*t

0 = 23.26+(-9.8)*t

(9.8)*t = 23.26

t =( 23.26) / (9.8)

t= 2.37 s

t₁= (2.37)*(2) s = 4.74 s: total ball time going up and down

t₂= 4.74 s - 1.05 s = 3.69 s

You might be interested in
• What are common questions, concerns, practices, and experiences across various world religions? Include indigenous religions i
faltersainse [42]

<u>Answer:</u>

<em>They are a lot of religions and faiths across the globe. </em>

<u>Explanation:</u>

There are  a lot of monotheistic and polytheistic religions across the world that took origin at different points in the past.

Some of them are:

  • Christianity- It is a monotheistic religion based on the teachings of Jesus Christ believed to be the son of god.  
  • Confucianism it evolved in China and is based on the teachings scholar and philosopher Confucius. It is a largely secular and humanistic.
  • Buddhism it is based on the life and teachings of Gautama Buddha. Buddhism advocates a way of life with meditation and instructs its followers to be compassionate, kind and wise.  
  • Hinduism –It evolved during the period of Indus valley civilisation and is a polytheistic religion. Hinduism beliefs mention rebirths or ‘punarjanma’.
  • Islam- Islam is a monotheistic religion.It considers Muhammad as the messenger of only god Allah.
5 0
3 years ago
Is it using energy when someone stands against a locker that doesn’t move
soldi70 [24.7K]

When someone stands against a locker and is does not moving at all, then there will be no displacement and since displacement = 0

Work done also becomes equal to zero.

Work done is usually defined as change in energy. Since the work done is zero there has been no energy used.

5 0
3 years ago
I NEED HELP THIS DUE TODAY! ”What are 12 facts about ENERGY?” 50 points if answered!!
romanna [79]

Answer:

The average U.S. home uses about 11,000 kilowatt hours of electricity per year.

Electricity travels at the speed of light – over 186,000 miles per second.

Electricity can be produced from fossil fuels, large hydro power plants, nuclear power plants, or renewables like wind or solar.

Birds and other small animals can perch on power lines without being electrocuted unless they simultaneously touch another line, which would create a complete circuit.

For electricity to come into your home, it travels from generation facilities to a high-voltage switchyard, to transmission lines, to a substation, to a distribution line, to a transformer, to your house.

Geothermal energy comes from the Earth. It consists of hot water and hot rock that’s just a few miles beneath the Earth’s surface, and can go even deeper to very hot molten rock called magma. It’s considered clean and sustainable.

Renewable energy comes from perpetual sources like wind, solar or geothermal. Most electricity, though, is produced from nonrenewable sources like fossil fuels (coal, crude oil, natural gas, and uranium). They are nonrenewable because there is a finite amount of them that were formed from buried remains of plants and animals that lived millions of years ago. They cannot be replenished the way renewable energy sources can.  

In the U.S., the areas most favorable for geothermal energy use are in Nevada, Oregon, Idaho, Arizona, Utah, Colorado and New Mexico. Geothermal plants are located where water has seeped into the Earth’s crust, and they force the water back up through permeable rock.

Saving energy can be as simple as switching from incandescent light bulbs to CFL or LED versions.  

About 40 percent of energy from all resources is used for electricity, which means that our resources are used more for that purpose than for any other.

 

CFL bulbs consume 80% less electricity than standard bulbs

Natural Gas Facts

When we think about energy facts, we usually focus on electricity, but our homes use natural gas, too! Natural gas is a gaseous mixture of hydrocarbon compounds used as fuel to generate electricity. In order to be used in your home, it must first be processed and converted into dry natural gas. To learn more about its use in your home, check out the natural gas facts below.

 

10 Facts about Natural Gas

The main component of natural gas is methane, with butane, propane, ethane, or pentane sometimes included.

The “rotten egg” smell of natural gas is actually added by power companies so that your nose can detect a gas leak. In its initial state, natural gas is colorless and nearly odorless.

Most natural gas is delivered via pipeline; there are enormous networks that deliver it to processing facilities, which then transport it to the end consumer. Along the route, there are compressors and metering stations to monitor pressure, flow, and leaks.

When natural gas is transported between countries, it travels by ship in liquid form. This way, it takes up less volume. Once it reaches land, it is regasified (or returned to gas form) and sent to the pipelines for distribution.

In the U.S., there are more than 2.5 million miles of pipeline used for transporting natural gas directly into homes and businesses.

It’s reported that 85 percent of the natural gas consumed in the United States is produced domestically.

Energy facts suggest that natural gas is one of the cleanest choices for fossil fuels. It produces less carbon and pollution than other fossil fuels.

The natural gas and oil industry employs nearly 10.3 million Americans. That’s equals to about 5.6 percent of all of U.S. employment.

Approximately 66 million homes and 5 million businesses in the U.S. use natural gas as an energy source.

This is one of the more important natural gas facts: transportation is one of the most difficult and fragile aspects to its use. Because the main component to natural gas is methane, which is a potent greenhouse gas, undetected leaks can contribute to climate change.  

The "rotten smell" is added to the natural gas so your nose can detect a gas leak

Energy Conservation

What Is Energy Conservation?

Your energy use can really affect your energy bill, and directly impacts the environment. In a world of scarce resources, find out how you can conserve energy and save.

Water Conservation

What Is Water Conservation?

Though water is a renewable resource, fresh clean water is in limited supply. Check out our energy tips for conserving water to benefit the environment –– and your wallet.

5 0
3 years ago
Read 2 more answers
A 12.5843-gram sample of metal bromide, MBr4, was dissolved and, after reaction with silver nitrate, AgNO3, all of the bromide w
barxatty [35]

Answer:

zirconium

Explanation:

Given, Mass of AgBr(s) = 23.0052 g

Molar mass of AgBr(s) = 187.77 g/mol

The formula for the calculation of moles is shown below:

Moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles\ of\ AgBr= \frac{23.0052\ g}{187.77\ g/mol}

Moles\ of\ AgBr= 0.1225\ mol

The reaction taking place is:

MBr_4+4AgNO_3\rightarrow 4AgBr+M(NO_3)__4

From the reaction,

4 moles of AgBr is produced when 1 mole of MBr_4 undergoes reaction

1 mole of AgBr is produced when 1 / 4 mole of MBr_4 undergoes reaction

0.1225 mole of AgBr is produced when \frac {1}{4}\times 0.1225 mole of MBr_4 undergoes reaction

Moles of MBr_4 got reacted = 0.030625 moles

Mass of the sample taken = 12.5843 g

Let the molar mass of the metal = x g/mol

So, Molar mass of MBr_4 = x + 4 × 79.904 g/mol = 319.616 + x g/mol

Thus,

0.030625 = \frac{12.5843}{319.616 + x}

Solve for x,

we get, x = 91.2999 g/mol

<u>The metal shows +4 oxidation state and has mass of 91.2999 g/mol . The metals is zirconium.</u>

8 0
3 years ago
A 1kg pool ball travels to the right at 2m/s and hits another stopped pool ball bounces back to the left at 1m/s what is the vel
Burka [1]
Ptotal=Ptotal —> m1v1+m2v2=m1v1’+m2v2’ —> (1kg)(2m/s)+(1kg)(0m/s)=(1kg)(-1m/s)+(1kg)(v2’) —> v2’=3m/s

answer: v=3m/s
5 0
3 years ago
Other questions:
  • Planets use carbon dioxide for?
    11·2 answers
  • What are the main agents of metamorfic rock?
    12·1 answer
  • Platinum has a density of 21 g/cm3. A platinum ring is placed in a graduated cylinder that contains water. The water level rises
    10·2 answers
  • What do velocity and acceleration have in common?
    14·2 answers
  • Which of the following describes a magnet that only has a field when a current is present? permanent magnet magnetic domain elec
    11·1 answer
  • billy bob joe's truck has a mass of 3,800 g and an acceleration of 4.5 m/s^2. what is the force of the truck? (you will have to
    10·1 answer
  • How does temperature influence the appearance of a star? Give an example in your response.
    10·1 answer
  • A bat produces a sound at 17,250Hz and wavelength 0.019m. What is<br> the speed of the sound?
    5·1 answer
  • How do I fix my task bar thing
    11·1 answer
  • List the planet name and position from the Sun for each one (1, 2, 3)
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!