Answer:
[tex]\boxed {\boxed {\sf 5.6 \ m/s^2}}[/tex]
Explanation:
We are asked to find the acceleration of a sports car.
Acceleration is the rate of change of velocity with respect to time. It is the change in velocity over time. Therefore, the formula for calculating acceleration is:
[tex]a= \frac {v_f-v_i}{t}[/tex]
The car can accelerate from 5.0 meters per second to 30 meters per second in 4.5 seconds.
[tex]v_f[/tex]=30 m/s [tex]v_i[/tex]= 5.0 m/s t= 4.5 sSusbtitute the values into the formula.
[tex]a= \frac{ 30 \ m/s - 5.0 \ m/s}{4.5 \ s}[/tex]
Solve the numerator.
30 m/s - 5.0 m/s = 25 m/s[tex]a= \frac{25 \ m/s}{4.5 \ s}[/tex]
Divide.
[tex]a=5.55555556[/tex]
The original measurements all have 2 significant figures, so our answer must have the same. For this number, 2 sig fig is the tenth place. The 5 in the hundredth place tells us to round the 5 in the tenth place up to a 6.
[tex]a \approx 5.6 \ m/s^2[/tex]
The sports car's acceleration is approximately 5.6 meters per second squared.
a Name the store of energy when you are
pressing downwards on the stretchy skin
of the trampoline
17. Explain how to calculate the density of an irregular shaped object such as a
rock.
Your
answer
Answer:
Q andA : Density of an irregular shape
1: the density of something is just th mass divided by the volume:D=m\V
2: As described in the previous question the density is given by D= M\V
3: the density just means how much mass per volume.
Compare the advantages and disadvantages of using nuclear energy.
The advantages of using nuclear energy are: carbon-free, Small land footprint, High power output, Reliable energy source but the disadvantages of using nuclear energy are Very high upfront costs, Nuclear waste, Malfunctions can be catastrophic.
What is nuclear energy?The energy source located in the nucleus, or core, of an atom is known as nuclear energy. Once captured, this energy can be used to generate electricity by causing nuclear fission in a reactor by either nuclear fusion or nuclear fission, two different types of atomic reactions.
The latter causes atoms to divide into two or more nuclei when uranium is utilised as fuel. The heat produced by the fission energy causes a cooling agent, typically water, to boil. The steam produced by boiling or pressurized water is then sent into turbines, which spin and produce power. Uranium is the fuel used in reactors to create nuclear fission.
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Nuclear energy is the form of energy released from the nucleus, the core of atoms released from protons and neutrons. Nuclear energy is produced by two types and they are nuclear fission and fusion.
Nuclear fusion is the process of fusing two lighter nuclei and nuclear fission is the splitting of heavier nuclei into two lighter nuclei and releasing energy is called nuclear energy.
The advantage of nuclear energy is it produces more amount energy from less fuel and produces low pollution. No emission of greenhouse from nuclear energy.
The disadvantage of nuclear energy is, that radioactive waste is the result of nuclear power plants which is a big threat to the environment. It is a not form of renewable energy. It involves huge investment and is not economical.
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Look at the circuit below. What is the potential difference across lamp 2?
The potential difference across lamp #2 is 4.5 volts.
A 15-volt power supply is used to power a circuit with two resistors in series. The voltage drop across R1 is 5 volts. What is the voltage drop across R2?
5 volts
20 volts
10 volts
0 volts
A 10-volt power supply is used to power a circuit, producing a current of 2 A. If total resistance of circuit is doubled, how will this affect the circuit?
A. Voltage drop across each resistor will all double to match change in resistance
B. The current will change so that the voltage drop for a complete loop through the circuit becomes 5 V.
C. The current will change so that the voltage drop for a complete loop through the current remains at 10 V.
D. The voltage drop across each resistor will be unaffected because each will remain at 0 V
(1) The voltage drop in the second resistor is 10 V.
(2) The voltage drop across each resistor will all double to match change in resistance.
The given parameters:
voltage in the circuit, V = 15 Vvoltage drop in first resistor, V1 = 5 VThe total voltage in a series circuit is given as;
[tex]V_T = IR_1 + IR_2\\\\V_T = V_1 + V_2[/tex]
The voltage drop in the second resistor is calculated as follows;
[tex]V_2 = V_T - V_1\\\\V_2 = 15 - 5\\\\V_2 = 10 \ V[/tex]
(2)
voltage supply, V = 10 Vcurrent, I = 2 AThe resistance of the circuit:
[tex]R = \frac{V}{I} = \frac{10}{2} = 5 \ ohms[/tex]
When the total resistance is doubled;
In series circuit, the current in each resistor is constant, the voltage drop is calculated as;
[tex]V = IR\\\\V = 2 (5+5)\\\\V = 20 \ V[/tex]
Thus, we can conclude that the voltage drop across each resistor will all double to match change in resistance.
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Please help I don't have a ruler lol
1. Firmly hold with one hand the end of a ruler over the edge of a table. Pull the other end down gently and listen to the sound. Then give the ruler a harder downward pull, and see if there is a difference in sound. Describe what you hear and explain the difference using the terms “energy,” “amplitude,” “intensity,” and “decibel.”
2. Take some time to listen to sounds in your environment. Make a list of ten sounds, ranking them from the highest pitch to the lowest. Write a couple of sentences describing whether this was easy or difficult and why. (Some of the sounds can come from tapping objects that vibrate or playing musical notes on an instrument.)
Answer:
When I gently push the end of the ruler down then let go, I heart and feel a slight vibration from the ruler. When I push it down harder, I feel and hear the same thing, just at a more intense frequency.
—--------------------------------------------------------------------------------------------------------------
Dog Barking
Timer
Microwave
Voice
Knocking on door
Car Coming Down Driveway
Typing
Foot Steps
Mouse clicking
Breathing
These were mostly easy except thinking of the last few were a little harder, it wasn't hard to organize them because I just had to think of the intensity of the sounds and rank them from loudest to softest.
Explanation:
Hope this helps!
(1) Ruler Experiment and Explanation: You may make a faint sound by allowing the ruler to vibrate while you slowly lower the end of the ruler over the edge of a table. Changes in the sound's energy, amplitude, intensity, and decibel level are what cause the difference:
Energy: Injecting additional energy into the ruler by pulling it more firmly. The ruler vibrates more as a result of the increased energy, which increases the number of sound waves produced.
Amplitude: The largest displacement of an object, while it is vibrating, is referred to as its amplitude. Higher sound waves are produced when the pull is stronger, since this causes greater vibrations with a higher amplitude.
Intensity: The amount of energy that sound waves carry per unit area is known as their intensity. A stronger draw causes more energy to be transferred to the air, boosting the sound's volume.
Decibel (dB): unit is used to measure the strength of sound. The sound gets louder and the decibel level rises as you pull the ruler further. Decibel measurements can be used to compare the two pulls' sound intensities.
Hence, due to energy, the ruler vibrates more, amplitude gives the displacement of the ruler, intensity is increased due to higher draw, and decibel measure, the strength of sound.
(2) Listening to Environmental Sounds
Depending on a person's knowledge of musical concepts and their capacity to discern between high and low frequencies, ranking sounds by pitch might be very simple or complex. Ten sounds are listed below, ranked from the highest pitch to the lowest pitch:
Whistle
Birds singing
dogs bark
Auto horn
Doorbell
musical note
music note
singing voice of a human
A drumbeat
a hefty item thudding
It could be difficult for someone who isn't used to recognizing frequency variances to rank sounds by pitch. Higher-pitched sounds are simpler to distinguish for people with musical training or a great sense of hearing. It might be more difficult for people who aren't as knowledgeable about musical details to distinguish between some sounds, especially if the pitch variances are slight.
Hence, it could be difficult for someone who isn't used to recognizing frequency variances to rank sounds by pitch. Higher-pitched sounds are simpler to distinguish for people with musical training or a great sense of hearing.
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Just need to know net force, balanced or unbalanced and accelerated or not accelerated! look at picture :)
Answer:
3. Net force 65 N right
Unbalanced
Accelerate
4. Net force 4 N downish lol
Unbalanced
Accelerate
5. Net force 21 N left
Unbalanced
Accelerate
6. Net force 8 N down
Unbalanced
Accelerate
7. Net force 0 N
Balanced
Not accelerate
8.
Net force 0 N
Balanced
Not accelerate
Explanation:
Hope this helps!
calculate the mass of the earth if the radius of the earth is 6.38 × 10^6
Answer:
C
Explanation:
C is i thing
eeg measures the synchronous electrical activity of the _____.
Explain how bats use ultrasound to catch a prey
Answer:
Ultrasound is used by bats to navigate (move) and catch prey. Ultrasonic squeaks are produced by bats. These squeaks ponder prey and then return to the bat's ear. This provides bats with information about the location of prey, allowing them to catch it.
Explanation:
Which vehicle will have more kinetic energy, a parked
semitruck or a car moving at 50 km/h?
Answer:
a semi truck
Explanation:
A medium-sized apple provides about 95.0 Calories of energy.
(a) Convert 95.0 Cal to joules.
(b) Suppose that amount of energy is transformed into kinetic energy of a 2.03 kg object initially at rest. Calculate the final speed of the object (in m/s).
(c) If that same amount of energy is added to 3.79 kg (about 1 gal) of water at 21.7°C, what is the water's final temperature (in °C)? The specific heat of water is
c = 4186
J
(kg · °C)
.
A. 95 Cal is equivalent to 397480 J
B. The final speed of the object is 625.78 m/s
C. The final temperature of the water is 46.8 °C
A. Converting 95 Cal to Joules
1 Cal = 4184 J
Therefore,
95 Cal = 95 × 4184
95 Cal = 397480 JThus, 95 Cal is equivalent to 397480 J
B. Determination of the speed of the object
Kinetic energy (KE) = 397480 J
Mass (m) = 2.03 Kg
Velocity (v) =?KE = ½mv²
397480 = ½ × 2.03 × v²
397480 = 1.015 × v²
Divide both side by 1.015
v² = 397480 / 1.015
Take the square root of both side
v = √(397480 / 1.015)
v = 625.78 m/sTherefore, the speed of the object is 625.78 m/s
C. Determination of the final temperature of the water
Mass of water (M) = 3.79 kg
Initial temperature of water (T₁) = 21.7 °C
Specific heat capacity of water (C) = 4186 J/KgºC
Heat (Q) = 397480 J
Final temperature (T₂) =?Q = MC(T₂ – T₁)
397480 = 3.79 × 4186 (T₂ – 21.7)
397480 = 15864.94 (T₂ – 21.7)
Clear the bracket
397480 = 15864.94T₂ – 344269.198
Collect like terms
397480 + 344269.198 = 15864.94T₂
741749.198 = 15864.94T₂
Divide both side by 15864.94
T₂ = 741749.198 / 15864.94
T₂ = 46.8 °CTherefore, the final temperature of the water is 46.8 °C
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How does mass and weight affect gravity?
Answer:
Explanation:
To start off you need to know that the mass of an object never changes. But gravity does. Think about it life this. Gravity is less on the moon but more on earth, therefore, gravity can change, but mass can't. Now its almost the same as weight because weight changed based upon the gravity. On the moon you weigh only about 10 pounds, on earth, you way much more, and so on.
To calculate the formula you have to do Mass×Gravity which can calculate into Weight.
~Evie weight = mass * gravity
We know that mass never changes, but the weight changes depending on the gravitational pull.
Answer:
Explanation:
Mass and weight affect gravity because weight is a measure of the force of gravity acting on an object, while mass is a measure of how much matter it contains. The gravitational force is equal to the mass of the objects and inversely proportional to the square of the distance between them.
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The symbols used in language have no direct relationship between the word and the object or idea.
Answer:
The symbols used in language have no direct relationship between the word and the object or idea. Underextension in language occurs when a child incorrectly uses one word to describe other objects or actions that are similar to that word. ... Morphemes are the smallest distinctive sound units in a language.
Explanation:
Answer:
True
Explanation:
e2021
How do the directions of these two post-explosion vectors compare?
Answer:
o o o G 30 30.0 30.0 5. How do the direction of these two post-explosion momentum vectors compare? 6. Use your answer to question +4, your answer to question #5, and the fact that momentum is a vector quantity to determine the post-explosion momentum of the system of two carts (i.e. the vector sum of the momentum of the two carts). 7. Use your answers to question #3 and question "6 to explain how one can say that system momentum is conserved in an explosion? S. Pick three different trials that have a different mass ratio. For each trial that you pick, fill in the table below. V/V Trial m/m 9. Analyze the data in the table above. State a rule that describes how to predict the relative velocities of the two carts after the explosion
Explanation:
Is water a element or compound or a mixture
Answer:
Water is a compound because it is made up of water molecules. There is no such thing as water atoms. Water molecules are made of hydrogen and oxygen atoms, in the definite proportion of two hydrogens for one oxygen.
In 2-3 sentences, summarize the evidence for the big bang theory. Include the following vocab words in your response: Redshift, Galaxies, Expansion, Cosmic microwave background.
Si olvidas un trozo de chocolate cerca de la estufa encendida, al rato, observa tu chocolate derretido, ¿Cómo estarán las partículas?
Answer:
partículas estarían separadas
Explanation:
ya que con el calor las partículas se alborotan y con frío se congelan
what’s the energy of motion
A.thermal energy
B. temperature
C. heat
D. kinetic energy
E.potential energy
Answer:
D. Kinetic energy
hope this helps
Answer:
D. Kinetic energy
Explanation:
The combination of kinetic energy and potential energy is known as mechanical energy
[tex]{ \tt{}}[/tex]
name two possible ways in wivh fossils can be dated and define them
Answer:
There are two main methods determining a fossils age, relative dating and absolute dating. Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.
Mark me with a crown
Answer: dna
Explanation:
sorry if this is wrong lol
What are 5 examples of expansion and contraction? What are their benefits?
Answer:
If you hold a hot glass tumbler under cold water, it will crack
Explanation:
This is because the outer surface of the glass comes in direct contact with cold water and contracts more compared to the inner surface.
This is one example I know.
What is the power of a crane that lifts a 120 N load 14 m in 3.6 s?
Answer:
1000n
Explanation:
hop it helps
Answer:
467 watts
Explanation:
Power is = to work/time. Work is = to force (N) times distance from starting point. So first, calculate work. 120N x14m , which is equal to 1680 joules. so then plug it into your power formula. 1680 joules/ 3.6 seconds= 466.666...7, which rounds to 467 watts.
3. What will happen when a light bulb is removed from the circuit below?
A .The remaining light bulbs go out.
B. The remaining light bulbs witdim
C.The brightness of the remaining light bulbs will not change
D.The remaining light but will brighten
Answer:
it's A.The remaining light bulbs go out.
4. A net force of 15 N is exerted on a book to cause it to accelerate at a rate of 5 m/s2. Determine the mass of the
book.
a. 0.33 kg
b. 2 kg
c. 3 kg
d. 45 kg
Answer:
3 kgExplanation:
The mass of an object given it's force and acceleration can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{15}{5} = 3 \\ [/tex]
We have the final answer as
3 kgHope this helps you
An object with a kinetic energy of 1125J has a
mass of 250kg. What is its velocity?
Answer:
3 m/s
Explanation:
Kinetic energy of a body is given by the formula [tex]K= {1\over2} m v^2[/tex]. Let's replace everything we have and solve for what's left.
[tex]1125J = {1\over2}\cdot 250 kg \cdot v^2[/tex]
[tex]v^2 ={ 1125 \cdot 2 \over 250}}[/tex] or [tex]v= 3 {m \over s}[/tex]
An athlete spins in a circle and throws a 1.6-kg discus. The radius of the discus's path is 1.0 m, and he releases it with an angular speed of 15.0 rad/s. The athlete spins for a total of 1.2 s before releasing the discus.
– What is the tangential speed of the discus at release?
– What is the centripetal acceleration of the discus?
– What is the centripetal force on the discus?
giving Brainliest for full and proper answers! thank you for anyone who tries to help/explain :)
(a) The tangential speed of the discus at the release is 15 m/s.
(b) The centripetal acceleration of the discus is 225 m/s².
(c) The centripetal force on the discus is 360 N.
The given parameters;
mass of the discus, m = 1.6 kgradius of the path, r = 1 mangular speed, ω = 15 rad/stime of motion, t = 1.2 sThe tangential speed of the discus at the release is calculated as follows;
[tex]v = \omega r\\\\v = 15 \ rad/s \ \times 1 \ m\\\\v = 15 \ m/s[/tex]
The centripetal acceleration of the discus is calculated as follows;
[tex]a_c = \frac{v^2}{r} \\\\a_c = \frac{15^2}{1} \\\\a _c = 225 \ m/s^2[/tex]
The centripetal force on the discus is calculated as follows;
[tex]F_c = ma_c\\\\F_c = 1.6 \times 225\\\\F_c = 360 \ N[/tex]
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Studying more difficult subjects first is an effective study habit because
оа
easier topics require less time to review
Ob
they make you the most tired
ос
they require more effort and mental energy
O d
you can get through them faster
Answer:
easier topics require less time to review
Explanation:
What are the positive and negative effects of tapping or harnessing geothermal energy? Cite ways to address the different environmental concerns related to both sources of energy
Answer:
It is a renewable resource as it renewably heats up water to a high temperature. Geothermal energy is more environmentally friendly than conventional fuel sources such as coal and other fossil fuels. In addition, the carbon footprint of a geothermal power plant is low.
Disadvantages: If dug deep underground, it can cause earthquakes. generates waste, reservoirs require proper management, it's location-specific, has high initial cost
There are seven fundamental quantities in physics. true or false
Answer:
True
Explanation:
mass, length, time, electric current, temperature, luminous intensity and amount of substance
A 10 kg box is motionless on the floor. If the coefficient of static friction is 0.4 and
the coefficient of kinetic friction is 0.3 (between the box and the floor), find the
force required to start the block in motion
The force required to start the given box in motion is 39.2 N.
The given parameters;
mass of the box, m = 10 kgcoefficient of static friction, [tex]\mu_s[/tex] = 0.4coefficient of kinetic friction [tex]\mu_k[/tex] = 0.3The force required to start the box in motion must be greater or equal to static frictional force.
The magnitude of the force is calculated as follows;
[tex]F = \mu_s F_n\\\\F = \mu_s mg\\\\F = (0.4) \times (10) \times (9.8)\\\\ F = 39.2 \ N[/tex]
Thus, the force required to start the box in motion is 39.2 N.
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Answer:
Explanation:
uk=0.3
us==00.4
f=10
ground acceleration =9.8
f=10×0.4×9.8=39.2
