Answer: A
Explanation:
Which of the following describes a change in energy that occurs as an acorn falls from a tree toward the ground
As an acorn falls from a tree toward the ground, gravitational potential energy is converted into kinetic energy.
To find the correct option among all the options, we need to know about the conversation of energy.
How are the gravitational potential energy and kinetic energy defined near the earth surface?Near the earth surface, the gravitational potential energy is given as mass×g×height from the earth surface.Kinetic energy is given as 1/2×mass×velocity².How are the gravitational potential energy and kinetic energy converted when acorn falls from a tree?When an acorn is going to fall, it is at maximum height of its journey, so it has maximum gravitational potential energy.Also, at that time, its kinetic energy is zero as it's at rest.But when it moves down, its potential energy decreases as the height decreases and kinetic energy increases due to increasing velocity. So that its total mechanical energy is conserved.Thus, we can conclude that option (d) is correct.
Learn more about the conversation of gravitational potential energy to kinetic energy here:
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Fossil fuels are burned, transferring their chemical potential energy to heat energy. How are nuclear power stations different?
Answer:
fossil fuels are natural and limited, nuclear is man made and more toxic
Explanation:
Jacob is building a soapbox derby car. He hopes to win an upcoming downhill race in his neighborhood.
Which of the following should he take into consideration if his only concern is winning the race?
A. the color of the goggles that he wears
B. the shape of the car he makes
C. the mass of the materials he uses
D. the strength of the materials he uses
What phase of matter are the particles least energetic, most dense, and best organized?
A. Plasma
B. Gas
C. Liquid
D. Solid
What is the most accurate way to check your heart rate (bpm)? Help me?
Answer:
Count your pulse for 60 seconds.
Explanation:
This isn't physics, this quesiton should be marked in health.
The voltage across the terminals of a generator is 5.7 v when it supplies a current of 0.3 A. It becomes 5.1 V when I=0.9A. Find its emf and it's internal resistance
Answer:
The emf of the generator is 6VThe internal resistance of the generator is 1 ΩExplanation:
Given;
terminal voltage, V = 5.7 V, when the current, I = 0.3 A
terminal voltage, V = 5.1 V, when the current, I = 0.9 A
The emf of the generator is calculated as;
E = V + Ir
where;
E is the emf of the generator
r is the internal resistance
First case:
E = 5.7 + 0.3r -------- (1)
Second case:
E = 5.1 + 0.9r -------- (2)
Since the emf E, is constant in both equations, we will have the following;
5.1 + 0.9r = 5.7 + 0.3r
collect similar terms together;
0.9r - 0.3r = 5.7 - 5.1
0.6r = 0.6
r = 0.6/0.6
r = 1 Ω
Now, determine the emf of the generator;
E = V + Ir
E = 5.1 + 0.9x1
E = 5.1 + 0.9
E = 6 V
14
A measure of the gravitational force exerted on an object?
A Weight
B) Force
C)Air resistance
Answer:
C
Explanation:
Answer:
A) weight
Explanation:
Hope it helps :))
Each bat can produce different frequencies of ultrasound. Explain why this is useful if there are many bats hunting together.
Answer: Although low frequency sound travels further than high-frequency sound, calls at higher frequencies give the bats more detailed information--such as size, range, position, speed and direction of a prey's flight. Thus, these sounds are used more often.
Explanation:
A snowflake falls from a cloud that is 500 m above the ground. It hits the ground after
being pulled down due to the acceleration of gravity (-10 m/s2). How fast will it be
going as it hits the ground?
Answer:
i wabnt the points lol
Explanation:
hehe i hate being a single girl....what physical properties dose europium have
Answer:
Europium has a bright shiny surface. it's steel grey and has a melting point of 826 degree Celsius and a boiling point of about 1,489 degree Celsius.
Explanation:
the density is 5.24 grams per cubic centimeter.
Joel uses a force of 50 Newtons to hold two weights 0.60 meters above his head. How much work is Joel doing on the weights?
The net force of two forces F1 and F2 acting in the same direction is 85N.And if is 15N when they are exerted in opposite directions. Find the magnitudes of F1 and F2
What happens to particles of a substance as its temperature increases? A the average kinetic energy increases B the average kinetic energy decreases C the average kinetic energy stays the same D nothing happens
the thumb is what to the phalanges?
Answer:
A thumb only has one joint and two phalanges. The thumb is referred to as “the big finger".
Brainlist pls!
1. What is the difference between thermal energy and heat? Give an example.
Answer:
when you run u get tied
Explanation:
I do not now this one
A sharpening wheel is traveling at 5 rad/s, it slows down to rest in 30 seconds while sharpening an axe. What is its angular acceleration?
Answer:
Angular acceleration [tex]= 0.167[/tex] rad/s^2
Explanation:
Given
Initial Angular velocity (w1) [tex]= 5[/tex] rad/s
Final Angular velocity (w2) [tex]= 0[/tex] rad/s
Time taken to change velocity from w1 to w2 [tex]= 30[/tex] seconds
Angular acceleration is equal to the change in angular velocity to the time taken for making thing change
Hence, Angular acceleration
[tex]\frac{w_2 -w_1}{t} \\\frac{5-0}{30}\\0.167[/tex]rad/s^2
A flight distance from philadelphia to cancun is 1469 miles.the estimated flight time is 3.25 hours.What is the avarage speeede of the plane in miles per hour(number and units)?
Answer:
1469 miles /3.25 hours = 452 miles per hours
Explanation:
divide distance by the time it takes to get there
what is a possible explanation for a set of facts that can be tested by further investigation called?
1. Questions
2. Hypothesis
3. Experiment
4. Summary
Answer:
Hypothesis.
Explanation:
Not a question, not a summary, and not an experiment.
F. A 50. A resistor (R2), and unknown resistor R2, a 120 Volt source, and an ammeter are connected in a
complete circuit. The ammeter reads 0.50 ampere (current).
R1
a. Determine the resistance of Rz.
R2
Complete question is;
A 50.-ohm resistor, an unknown resistor R, a 120-volt source, and an ammeter are connected in a complete circuit. The ammeter reads 0.50 ampere.
A) Calculate the equivalent resistance of the circuit shown.
B) Determine the resistance of resistor R shown in the diagram.
Answer:
A) R_eq = 240 Ω
B) R = 190 Ω
Explanation:
A) To get the equivalent resistance, we will use the formula;
R = V/I
Where;
V is Voltage
I is current
R is equivalent resistance
From the question, V = 120 V and I = 0.5A
Thus;
R_eq = 120/0.5
R_eq = 240 Ω
B) From the image, we see that the resistors are connected in series.
Formula for resistors in series is;
R = R1 + R2 +..... Rn
Thus;
240 = 50 + R
R = 240 - 50
R = 190 Ω
A) The equivalent resistance of the circuit shown will be 240 Ω.
B) The resistance of resistor R will be 190 Ω
What is resistance?Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.
The given data in the problem is;
R is the resistance = 50.-ohm
v is the voltage = 120-volt source
I is the value of the current =0.50 ampere.
A) The equivalent resistance of the circuit shown will be 240 Ω.
According to ohm's law
[tex]\rm R= \frac{V}{I} \\\\ \rm R= \frac{120}{0.5} \\\\ \rm R=240 \ ohm[/tex]
Hence the equivalent resistance of the circuit shown will be 240 Ω.
B) The resistance of resistor R will be 190 Ω
The given resistors are connected in the series;
R = R1 + R2 +..... Rn
240 = 50 + R
R = 240 - 50
R = 190 Ω
Hence the resistance of resistor R will be 190 Ω
To learn more about the resistance refer to the link;
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how can understanding velocity help to prevent a mid-air collision
Answer:
To maintain enough time to prevent a collision, a system operating in air traffic where aircraft speed does not
fall below 100 km/h (most medium-sized UAVs and GA aircraft) will need to be able to detect obstacles which
subtend an arc-width of as small as 0.125 mra
Tom puts a metallic cover over his car's windshield after parking. How does this control
the sun's rays during a sunny day?
Why is ultraviolet radiation considered more dangerous to humans than infrared radiation?
ANSWER:Ultraviolet radiation has a shorter wavelength than infrared radiation, and thus, the waves have higher energy. This allows them to penetrate the first layers of skin on humans and can mutate the DNA in the cells of the skin. This can result in cancer because of the mutations caused by the ultraviolet radiation.
CAN A BRAINLEST HELP PLEASE!!!
The diagram below represents a rope along which
two wave pulses of equal amplitude, A, approach
point P
The Escape speed at the surface of a certain planet is twice that of the earth. If the planet has radius twice of the Earth. what is its mass in unit of earth's mass?
Answer:
1.32 × 1022 short tons
Explanation:
hope this helps
The required mass of the planet is 8 times the mass of the earth.
Given that,
The Escape speed at the surface of a certain planet is twice that of the earth. The planet has a radius twice of the Earth. what is its mass in unit of earth's mass is to be determined.
An object with this velocity at the earth's surface will completely escape the earth's gravitational field, even after accounting for atmospheric losses.
here,
The escape velocity of the planet = 2 Escape velocity of the earth
[tex]\sqrt{{2GM_p}/r_p} = 2\sqrt{2GM_e/r_e}[/tex]
Substitute the values and square both sides,
[tex]{{2GM_p}/2r_e} = 4*{2GM_e/r_e}\\M_p = 8M_e[/tex]
Thus, the required mass of the planet is 8 times the mass of the earth.
Learn more about escape velocity here:
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What is the geocentric angle of the earthquake focus?
Answer:
epicenter
Explanation:
the epicenter Is d point directly above it at the structure of the earth
How are defenders on a baseball team positioned ?
Answer:
1 (pitcher), 2 (catcher), 3 (first baseman), 4 (second baseman), 5 (third baseman), 6 (shortstop), 7 (left fielder) 8 (center fielder), and 9 (right fielder)
Explanation:
There are nine fielding positions in baseball. Each position conventionally has an associated number, for use in scorekeeping by the official score
Name two devices we use generators in. Describe how they work.
Answer:
There are two fundamental types of generators known as AC (alternating current) and DC (direct current) generators. While the technique of producing electricity is the same in both types, AC and DC power become different in terms of their applications – the way in which loads receive electric power.
Explanation:
An electric generator is a device that converts mechanical energy obtained from an external source into electrical energy as the output. ... Instead, it uses the mechanical energy supplied to it to force the movement of electric charges present in the wire of its windings through an external electric circuit.
What are two characteristics of transverse waves that are not found in longitudinal waves
Answer:
I don't know I'm sorry I will tell you another answer asks me to
HELP ME PLEASE I need the answer now and I will give all my brain lists
Answer:
I'd say it's B
Sorry if I get you wrong-
Clothes in a dryer rub together and begin clinging to each other
A. Friction
B. Conduction
C. Induction
Answer:
Conduction
Explanation:
Because they touch lol
Answer:
Conduction
Explanation:
Because induction is the pass of electricity without contact and conduction is the complete opposite