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
Gnom [1K]
3 years ago
9

Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls to the ground. Think about the amounts o

f potential and kinetic energy the bowling ball has:
as sits on top of a building that is 40 meters tall.
as it is half way through a fall off a building that is 40 meters tall and travelling 19.8 meters per second.
as it is just about to hit the ground from a fall off a building that is 40 meters tall and travelling 28 meters per second.
When does the bowling ball have the most potential energy?

Question 1 options:

When it is sitting on top of the building.


When it is 1/2 down the building.


Just before it hits the ground.

Question 2 (1 point)
Directions: Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls to the ground. Think about the amounts of potential and kinetic energy the bowling ball has:

Does the bowling ball have more potential energy or kinetic energy as it is half way through its fall?

Question 2 options:

The potential energy is the greatest.


The kinetic energy is the greatest.


The potential energy and kinetic energy are the same.

Question 3 (1 point)
Directions: Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls to the ground. Think about the amounts of potential and kinetic energy the bowling ball has:

Does the bowling ball have more potential energy or kinetic energy just before it hits the ground?

Question 3 options:

This is when the kinetic energy is the greatest.


This is when the potential energy is the greatest.


The potential and kinetic energy are the same.

Question 4 (1 point)
What is the potential energy of the 2 kg ball that is sitting on top of the 40 meter building?

Question 4 options:

80 J


784 J


80 N


784 N

Question 5 (1 point)
The kinetic energy of the ball 1/2 way through the fall will be equal to 2kg*9.8*20 meters or 392 Joules, because the kinetic energy and potential energy are the same at this point.

Question 5 options:
True
False
Physics
1 answer:
likoan [24]3 years ago
3 0

Answer:

1) At the highest point of the building.

2) The same amount of energy.

3) The kinetic energy is the greatest.

4) Potential energy = 784.8[J]

5) True

Explanation:

Question 1

The moment when it has more potential energy is when the ball is at the highest point in the building, that is when the ball is at a height of 40 meters from the ground. It is taken as a point of reference of potential energy, the level of the soil, at this point of reference the potential energy is zero.

E_{p} = m*g*h\\E_{p} = 2*9.81*40\\E_{p} = 784.8[J]

Question 2)

The potential energy as the ball falls becomes kinetic energy, in order to be able to check this question we can calculate both energies with the input data.

E_{p}=m*g*h\\ E_{p} = 2*9.81*20\\ E_{p} = 392.4[J]\\

And the kinetic energy will be:

E_{k}=0.5*m*v^{2}\\  where:\\v =  velocity = 19.8[m/s]\\E_{k}=0.5*2*(19.8)^{2}\\  E_{k}=392.04[J]

Therefore it is the ball has the same potential energy and kinetic energy as it is half way through its fall.

Question 3)

As the ball drops all potential energy is transformed into kinetic energy, therefore being close to the ground, the ball will have its maximum kinetic energy.

E_{k}=E_{p}=m*g*h = 2*9.81*40\\  E_{k} = 784.8[J]\\ E_{k} = 0.5*2*(28)^{2}\\ E_{k} = 784 [J]

Question 4)

It can be easily calculated using the following equation

E_{p} =m*g*h\\E_{p}=2*9.81*40\\E_{p} =784.8[J]

Question 5)

True

The potential energy at 20[m] is:

E_{p}=2*9.81*20\\ E_{p}= 392.4[J]\\The kinetic energy is:\\E_{k}=0.5*2*(19.8)^{2} \\E_{k}=392[J]

You might be interested in
All of the noble gases, Group 18, have eight valence electrons in its outer shell (excluding helium which only has two). Which o
ikadub [295]

Answer:

Zero or +2

Explanation:

The noble gases already have a avplete outermost shell. They are the least reactive elements of earth?

Their normal oxidation number is zero but some have been shown to be reactive.

6 0
3 years ago
Read 2 more answers
In which situation are both the speed and velocity of the car changing?
lubasha [3.4K]
Answer is A because the speed and velocity would change. Think of it as GTA, your going 30+ miles per hour and you take a left turn, the speed and velocity would change in an instant.. 
Hope this helped.
6 0
3 years ago
Read 2 more answers
Earth’s polar ice caps contain about 2.3 × 1019 kg of ice. This mass contributes essentially nothing to the moment of inertia of
sp2606 [1]

Answer:

Explanation:

Initial moment of inertia of the earth I₁ = 2/5 MR² , M is mss of the earth and R is the radius . If ice melts , it forms an equivalent shell of mass  2.3 x 10¹⁹ Kg

Final moment of inertia I₂ = 2/5 M R² + 2/3  x 2.3 x 10¹⁹ x R²

For change in period of rotation we shall apply conservation of angular momentum law

I₁ ω₁  = I₂ ω₂  ,  ω₁ and   ω₂ are angular velocities initially and finally .

I₁ / I₂     =  ω₂ / ω₁

I₁ / I₂     =  T₁ / T₂  , T₁ , T₂ are time period initially and finally .

T₂ / T₁ = I₂ / I₁

(2/5 M R² + 2/3  x 2.3 x 10¹⁹ x R²) / 2/5 MR²

1 + 5 / 3  x 2.3 x 10¹⁹ / M

= 1 + 5 / 3  x 2.3 x 10¹⁹ / 5.97 x 10²⁴

= 1 + .0000064

T₂ = 24 (1 + .0000064)

= 24 hours + .55 s

change in length of the day = .55 s .

3 0
3 years ago
Forces are needed to make a car do which of these?
zalisa [80]
All of the above.

if your car is on a steep hill it needs force to stop moving and to speed up
8 0
2 years ago
Recessed incandescent luminaires not marked type ic and those marked for installing directly in ___________ must not have insula
slavikrds [6]

Answer:

Recessed incandescent luminaires not marked type ic and those marked for installing directly in insulated ceilings must not have insulation over the top of the luminaire.

Explanation:

Depending on how they interact with insulation, lighting fixtures are rated at various levels. Non-IC rated lighting fixtures can accommodate higher wattage bulbs, but they also pose the greatest fire risk when used with the incorrect insulation.

In locations with insulation, light fixtures that are not IC rated may be installed. But there is a condition. The distance between the fixture and any insulation should be 3 inches. But the 3 inch gap in the insulation would negate the goal of insulation by producing a lot of uninsulated space, so this defies logic. Building a box-style cover to cover the fixture on the attic side is one option to fix this. Drywall or foil-faced foam insulation can be used to create this box. After the cover is put in place, insulation can be added for maximum effectiveness.

To learn more about recessed incandescent luminaries. Click brainly.com/question/17218799

#SPJ4

6 0
1 year ago
Other questions:
  • In a spy movie, the hero, James, stands on a scale that is positioned horizontally on the floor. It registers his weight as 810
    14·1 answer
  • Geologists use the blank test to determine the hardness of a mineral
    10·1 answer
  • You are asked to calculate an object's velocity, in order to do so you must know the object's ?
    12·1 answer
  • On which date does the antarctic circle have 24 hours of daylight
    7·2 answers
  • A stockroom worker pushes a box with mass 11.2 kg on a horizontal surface with constant speed of 3.50m/s. The coefficient of kin
    15·1 answer
  • A 10 kg ball is swung in a horizontal circle at the end of a 2 - m rope over a persons head. The ball makes 30 revolutions per m
    11·1 answer
  • A kayaker moves 22 meters northward, then 18 meters southward , and finally 24 meters northward what is the distance and magnitu
    15·1 answer
  • Consider an electron that is 10-10 m from an alpha particle (9 = 3.2 x 10-19 C). (Enter the magnitudes.) (a) What is the electri
    13·1 answer
  • (b) The cylinder shown in figure 2 is fitted with a freely sliding piston containing an ideal gas of mass 13g and volume 1.0×10⁴
    7·1 answer
  • I need help plz!!! Please help...
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!