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
Tomtit [17]
2 years ago
13

A 2-kg bowling ball sits on top of a building that is 40 meters tall.

Physics
2 answers:
timama [110]2 years ago
6 0
1. A 2-kg bowling ball sits on top of a building that is 40 meters tall. Circle one: KE / GPE / both Show your work for finding the values of each type of energy the object has:
KE = 0 (because velocity is 0)
PE = mgh = 2kg*9.8m/s^2*40m= 784 joule
2. A 2-kg bowling ball rolls at a speed of 5 m/s on the roof of the building that is 40 tall. Circle one: KE / GPE / both Show your work for finding the values of each type of energy the object has:
BothKE = [1/2]m*v^2 = [1/2](2kg)(5m/s)^2 =  25 joulPE = mgh = 40 joule
3. A 2-kg bowling ball rolls at a speed of 10 m/s on the ground. Circle one: KE / GPE / both Show your work for finding the values of each type of energy the object has: 
KE = [1/2]m(v^2) = [1/2]2kg*(10m/s)^2 = 100 joule
GPE = mgh = 0
1. A 1,000-kg car has 50,000 joules of kinetic energy. What is its speed?
KE = [1/2]m(v^2) => v = √[2KE/m] = √[2*50,000joules/1000kg] = 10m/s
2. A 200-kg boulder has 39,200 joules of gravitational potential energy. What height is it at? 
GPE = mgh => h = GPE / (mg) = 39,200 joules / (200kg * 9.8m/s^2) = 20m
3. A 1-kg model airplane has 12.5 joules of kinetic energy and 98 joules of gravitational potential energy. What is its speed? What is its height?
KE = [1/2]m(v^2) => v = √ [ 2KE/m] = √[2*12.5 j / 1kg] = 7.9 m/s
GPE = mgh => h = GPE/(mg) = 98/(1kg*9.8m/s^2) = 10 m


Rina8888 [55]2 years ago
6 0

Answer:

<u>The GPE: </u>

So, each object, matter or system holds some stored energy inside its molecules and such energy is stored in the system due to its position or height from the surface or ground.

Mathematical equation:

GPE=mgh, (while "m" is the mass, "g" is gravity, and "h" is the height of the object where it is been placed on).

<u>The K.E(Kinetic energy):</u>

Kinetic energy is the amount energy produced or possessed by it due to some motion in any direction.

<u>Mathematical equation:</u>

K.E= 1/2 m×v²<u>,</u> (As "m" is the mass of the body or object, while the velocity represents its motion)

Explanation:

<u>1.Answer-(G.P.E):</u>Because, it is not in motion but it is been placed on some point at a certain height,h from the ground or surface.

So, we have, G.P.E= m.g.h and by putting the values into the equation, we can get the results as follow,

G.P.E=(2)×(9.8)×(40)⇒<u> G.P.E=  784 kg.m².sec²,</u>

<u>2.Answer-(Both):</u> The body is present on the roof top at height  giving it the G.P.E possessed by the object or the body, along with the K.E due to its moment on the top of the building.

<u>Calculation:</u> K.E+G.P.E= Total energy⇒ Tot. energy= 1/2×(2)×(5)²+ (2)×(9.8)×(40),

Tot.energy= 809 J(kg.m².sec²).

<u>3.Answer-(K.E):</u>

When the ball is present on the ground and it is in motion(as it h=0). Then the energy possessed by the body will be Kinetic energy,K.E.

<u>Calculations:</u> K.E=1/2×(2)×(10)²,

K.E=1/2×(2)×(100),

K.E=100 kg.m².sec².

3.Answer-(Both, but at the summit point it will be G.P.E and during the downfall it will be K.E): When a child is thrown upwards in the air by his or her parents then the G.P.E will be attained by the subject at a certain point called as the summit point, and then during the down fall it will change into the K.E.

Then, Tot. energy= m.g.h + 1/2 m.v²,

⇒ Tot.energy= (20)×(9.8)×(2) + 1/2 (20)×(5)²,

⇒Tot.energy=392+250,

⇒Tot.energy=642 kg.m².sec².

  • Part:2,

As, we know that the total G.P.E possessed by any object is equal to the total K.E, then we can say that;

  • K.E=P.E,

But,along with that we can write as,

  • K.E=1/2×(1000)×(v)²,

Putting the required values in the above equation we can have,

  • 50,000=1/2×(1000)×(v)²,
  • 50,000=500×(v)²,
  • 50,000/500=v²,
  • v²=100,
  • √v²=√100,
  • <u>v=10 m/sec,</u>

<u>Now, to find the height,h=?</u>

  • G.P.E=m.g.h,
  • 39,200=(200)×(9.8)×(h),
  • 39,200=1960×(h),
  • <u>h=20 meter,</u>

<u>As to find the speed,v=? and the height,h=?.</u>

We, have for speed the following formula:

K.E=1/2×(m)×(v)²,

12.5=1/2×(1)×(v)²,

v²=25,

so,

√v²=√25,

<u>v=5 m/sec,</u>

<u>And to find the height,h=?, we have;</u>

G.P.E=m.g.h,

98=(1)×(9.8)×(h),

<u>h=10 meters.</u>

<u></u>

<u></u>

You might be interested in
A wave emitted from a source has a frequency of 10 Hz and wavelength 2.5 m. How much time will it take to reach a person located
const2013 [10]

Answer:

time taken by the wave to reach the person is 0.2 s

Explanation:

As we know that the speed of the wave is given as

v = \lambda f

here we know that the wavelength of the wave is

\lambda = 2.5 m

f = 10 Hz

now speed of the wave is given as

v = 10(2.5)

v = 25 m/s

Now time taken by the wave to reach 5 m distance is

t = \frac{L}{v}

t = \frac{5}{25}

t = 0.2 s

4 0
3 years ago
The poles of the Earth's magnetic field line up with the geographic poles of the Earth.
Varvara68 [4.7K]

Answer: False

Explanation: A magnetic compass does not point to the geographic north pole. A magnetic compass points to the earth's magnetic poles, which are not the same as earth's geographic poles. Furthermore, the magnetic pole near earth's geographic north pole is actually the south magnetic pole.

8 0
3 years ago
Read 2 more answers
A penny has a mass of 2.50 g, a diameter of 19.55 mm, and a thickness of 1.55 mm. Calculate the density of the material from whi
Dmitry [639]
Density = (mass) divided by (volume)

We know the mass (2.5 g).  We need to find the volume.

The penny is a very short cylinder.
The volume of a cylinder is (π · radius² · height).
The penny's radius is 1/2 of its diameter = 9.775 mm.
The 'height' of the cylinder is the penny's thickness = 1.55 mm.

Volume  =  (π) (9.775 mm)² (1.55 mm)

             =  (π) (95.55 mm²) (1.55 mm)

             =  (π) (148.1 mm³)

             =        465.3 mm³

We know the volume now.  So we could state the density of the penny,
but nobody will understand what we have.  Here it is:

         mass/volume = 2.5 g / 465.3 mm³  =  0.0054 g/mm³  .

Nobody every talks about density in units of ' gram/(millimeter)³ ' .
It's always ' gram / (centimeter)³ '.
So we have to convert our number for the volume.

                         (0.0054  g/mm³)  x  (10 mm / cm)³

                 =      (0.0054 x 1,000)  g/cm³

                 =          5.37  g/cm³  .

This isn't actually very close to what the US mint says for the density
of a penny, but it's in a much better ball park than 0.0054 was.
4 0
3 years ago
Now, consider the resultant electric field e⃗ net at p. with reference to the coordinate system shown in the previous part, whic
Rzqust [24]
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Below are the choices:
only the x component
only the y component
both the x and y components
neither the x nor the y component

The answer is neither the x nor the y component

5 0
3 years ago
Please help will mark brainliest
andreyandreev [35.5K]

Answer:

b

Explanation:

it melts yes but it's still water [same element] so there fore it's a physical change

7 0
3 years ago
Read 2 more answers
Other questions:
  • A system absorbed 44 joules of heat from its surroundings. After doing work, the increase in the internal energy of the system i
    12·2 answers
  • Can someone help me on #18 - #26? At least one ☝️ I really need help!!!
    10·1 answer
  • Which factors affect the speed of ocean waves?
    9·2 answers
  • An airplane flies at airspeed (relative to the air) of 280 km/h . The pilot wishes to fly due North (relative to the ground) but
    10·1 answer
  • 11.
    5·2 answers
  • A scientist has two containers. Inside each container, there is a blue liquid. The liquids are substances. What can the scientis
    8·1 answer
  • How many joules are required to heat .250 kg of liquid water from 0 °C to 100 °C ?
    10·1 answer
  • Can anyone help me please​
    7·1 answer
  • During which month is the bacteria population just under 1 million?
    6·1 answer
  • In most cultures, the difference between the majority viewpoint and the minority viewpoint is that the majority group is made to
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!