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3 years ago

Decisions made by the current generation

Physics

2 answers:

kvv77 [185]3 years ago

7 0

What is this question for? Like wat subject

ololo11 [35]3 years ago

6 0

The correct answer was

B. can open or limit possibilities of future generations.

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<em><u>100% correct Answers</u></em>

Question 1

Which kind of organism obtains energy only from producers?

herbivores

Question 2

Which of the following best describes a population?

members of the same species living in the same place at the same time

Question 3

Which of the following describes soil and temperature in an ecosystem?

abiotic factors

Question 4

A forest fire wipes out all of the plant life in an area, causing the animals to leave. The ground becomes a mixture of soil and ashes. Which order of succession is most likely to occur in the area?

grasses → shrubs → softwood trees → hardwood trees

Question 5

After a town is abandoned, the concrete parking lots remain empty and inactive for hundreds of years. What is the most likely order of ecological succession in that area?

lichens → grass → shrubs → trees

Question 6

The graphs show the trends in biodiversity of land-based life and marine-based life. Choose the answer that best fits the graph.

the sustainability of ecosystems is decreasing regardless of protected areas.

Question 7

Read the passage "Easter Island Palm." Choose the answer below that best fits the problem on Easter Island.

EASTER ISLAND PALM

In the 1400s, the Easter Island palm became extinct due to overharvesting. Reproduction was nearly impossible because islanders introduced rats when they first arrived. These rats ate the Easter Island palm seeds, preventing the Easter Island palm from flourishing. With the disappearance of the palm, the islanders could no longer build the boats they needed for fishing.

a decrease in the temperature, leading to decreased biodiversity

Question 8

The primary reason that the human population has grown rapidly over the past 100 years is that there has been

an increase in food supplies and better access to clean water.

Question 9

Which of the following would cause a decrease in a population's size?

emigration

Question 10

Decisions made by the current generation

can open or limit possibilities of future generations.

Question 11

In order to feed the growing population, scientists have found ways to increase the yield of a crop. What does the term yield mean?

Amount of food produced in an area.

Question 12

Which factor can cause secondary succession?

clear cutting

Question 13

What is the role of a pioneer species in primary succession?

to create the soil

Question 14

The number of rhinoceroses has decreased to near extinction. How are rhinoceroses classified under the Endangered Species Act?

endangered

Question 15

Lions live in groups called prides. Lion populations would most likely fall in which category of population distribution?

clumped

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A regulation basketball has a 15 cm diameter and may be appropriated as a thin spherical shell.

REY [17]

Solution :

From the given data,

For the spherical shell is $\frac{k^2}{R^2}= \frac{2}{3}$

where x is the radius of gyration and the acceleration of a rolling body on an inclined plane = a

Therefore,

$a =\frac{g \sin \theta}{1+ \frac{k^2}{R^2}}$

$= \frac{g \sin \theta}{1 +\frac{2}{3}}$

$= \frac{3}{5} g \sin \theta$

= 0.6 x 9.81 x sin ( 29.7)

$= 2.913 \ m/s^2$

$h = \frac{1}{2} a(\Delta t)^2$

$\Delta t = \sqrt{\frac{2h}{a}}$

$\Delta t = \sqrt{\frac{2 \times 2.9}{2.913}}$

Δt = 1.411 s

6 0

2 years ago

You are tasked with calibrating the springs for a pinball machine. Your method of testing the springs is by attaching masses ont

choli [55]

Answer:

$490.5\ \text{N/m}$

Explanation:

m = Mass attached to spring = 14 kg

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

x = Displacement of spring = $78-50=28\ \text{cm}$

k = Spring constant

The force balance of the system is given by

$kx=mg\\\Rightarrow k=\dfrac{mg}{x}\\\Rightarrow k=\dfrac{14\times 9.81}{0.28}\\\Rightarrow k=490.5\ \text{N/m}$

The spring constant for that spring is $490.5\ \text{N/m}$ .

6 0

3 years ago

A disk is uniformly accelerated from rest with angular acceleration α. The magnitude of the linear acceleration of a point on th

solniwko [45]

Answer:

$a = R\alpha\sqrt{1 + \alpha^2t^4}$

Explanation:

As we know that the acceleration of a point on the rim of the disc is in two directions

1) tangential acceleration which is given as

$a_t = R\alpha$

2) Centripetal acceleration

$a_c = \omega^2 R$

here we know that

$\omega = \alpha t$

$a_c = (\alpha t)^2 R$

now we know that net linear acceleration is given as

$a = \sqrt{a_c^2 + a_t^2}$

so we have

$a = \sqrt{R^2\alpha^2 + R^2(\alpha t)^4}$

$a = R\alpha\sqrt{1 + \alpha^2t^4}$

4 0

2 years ago

A car battery with a 12 V emf and an internal resistance of 0.11 Ω is being charged with a current of 56 A. What are (a) the pot

denpristay [2]

Answer:

Part a)

V = 18.16 V

Part b)

$P_r = 345 Watt$

Part c)

P = 672 Watt

Part d)

V = 5.84 V

Part e)

$P_r = 345 Watt$

Explanation:

Part a)

When battery is in charging mode

then the potential difference at the terminal of the cell is more than its EMF and it is given as

$\Delta V = E + i r$

here we have

$E = 12 V$

$i = 56 A$

$r = 0.11$

now we have

$\Delta V = 12 + (0.11)(56) = 18.16 V$

Part b)

Rate of energy dissipation inside the battery is the energy across internal resistance

so it is given as

$P_r = i^2 r$

$P_r = 56^2 (0.11)$

$P_r = 345 W$

Part c)

Rate of energy conversion into EMF is given as

$P_{emf} = i E$

$P_{emf} = (56)(12)$

$P_{emf} = 672 Watt$

Now battery is giving current to other circuit so now it is discharging

now we have

Part d)

$V = E - i r$

$V = 12 - (56)(0.11)$

$V = 12 - 6.16 = 5.84 V$

Part e)

now the rate of energy dissipation is given as

$P_r = i^2 r$

$P_r = 56^2 (0.11)$

$P_r = 345 W$

7 0

3 years ago

What is a example of a real life scientific inquiry problem

Papessa [141]

What is an example of how you can use scientific inquiry to solve a real life problem.

8 0

3 years ago