When the forces acting on an object are _____, the net force must be zero.
Answer:
According to Newton's first law, when the net force acting on an object is zero, the object must __have a velocity of zero___.
Explanation:
When the net force is zero, the acceleration is zero, so the velocity must be constant. Note that zero velocity is simply a special case of constant velocity.
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Answer:
D) positive and negative
Explanation:
1. Define friction. Name and describe two kinds of friction.
Answer:
Friction is a force that holds back the movement of a sliding object.
Explanation:
The two types of friction: Static friction and Kinetic friction. Static friction operates between two surfaces that aren't moving relative to each other, while kinetic friction acts between objects in motion.
Final answer:
Friction is a force that resists motion between two contacting surfaces, indispensable yet challenging. There are two primary types: static friction, which acts on objects at rest, and kinetic friction, which occurs once motion has begun. Understanding and calculating these forces are crucial in physics to solve related problems.
Explanation:
Defining Friction
Friction is a force that opposes motion between two surfaces that are in contact. It is an essential force in everyday life, allowing us to walk and drive vehicles without slipping but also poses a challenge as it causes wear and tear on moving parts of machines.
Types of Friction
Static Friction
Static friction occurs between two surfaces that are not moving relative to each other. It needs to be overcome for motion to start. An example of static friction is pushing a stationary car; it takes considerable force to get the car moving.
Kinetic Friction
Kinetic friction, also known as dynamic friction, acts between two surfaces that are in motion relative to one another. An example of kinetic friction is the force you feel when sliding a book across a table.
Calculating Friction
The magnitude of static and kinetic friction can be calculated using formulas that take into account the coefficient of friction between the two surfaces and the normal force exerted between them. These calculations are critical in solving problems involving Newton's laws of motion.
Select the correct answer from each drop-down menu.
The standard wave format for any wave is
wave. When depicting
wave in standard wave
format, the direction of motion must be rotated by 90 degrees. Only one of two waves is shown at a time when placing
wave in standard wave format.
Reset
Next
Answer:
a transverse (sort of a plot of a sine or cosine graph, basically)
b longitudinal
c Electromagnetic (an electric wave and a magnetic wave travelling together at right angles to each other)
Explanation:
Waves are able to cause a disturbance along a medium thereby transferring energy.
What is a wave?The image and the details of the question are missing but I will try to help you the much I can. A wave is defined as a disturbance along a medium which transfers energy.
A wave can be classified as;
Transverse waveLongitudinal waveOr as;
Mechanical waves andElectromagnetic wavesHence, waves are able to cause a disturbance along a medium thereby transferring energy.
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A 24.8 cm tall object is placed in
front of a lens, which creates a
-3.09 cm tall image. If the object is
37.5 cm from the lens, what is the
image distance?
Answer:
Image distance, v = 4.67 cm
Explanation:
We have,
Height of the object, h = 24.8 cm
Height of the formed image, h' = -3.09 cm
Object distance, u - -37.5 cm
It is required to find the image distance. Lens formula is :
[tex]\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}[/tex]
Using formula of magnification,
[tex]m=\dfrac{v}{u}=\dfrac{h'}{h}[/tex]
v is image distance
[tex]v=\dfrac{uh'}{h}\\\\v=\dfrac{-37.5\times (-3.09)}{24.8}\\\\v=4.67\ cm[/tex]
So, the image distance is 4.67 cm.
a person who works in only area of a subject is a
A person who works in only one area of a subject is known as a specialist. This applies to many fields, including world languages, where a person who intensely studies and focuses only on one particular language and its aspects, such as Spanish, could be considered a Spanish language specialist.
Explanation:A person who works in only one area of a subject is often referred to as a specialist. This term can be applied across many fields, but is especially relevant in the field of world languages. For example, a person who intensely studies and focuses only on Spanish language and literature might be considered a Spanish language specialist.
These individuals typically have deep knowledge and understanding of their specialization. This not only includes the language itself, but also its literature, culture, history and other aspects that might not be covered by someone with broad but shallow knowledge. Therefore, if you're looking to learn advanced Spanish for example, seeking help from a Spanish language specialist would be highly beneficial.
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velocity is described by __ and time
Answer:
distance
Explanation:
a 7.3kg gallon paint can is lifted 1.78 meters vertically to a shelf. what is the change potential energy of the paint can
Answer:
127.5 J
Explanation:
Potential energy is given as the product of mass of an object, the height moved and acceleration due to gravity. Therefore, PE=mgh
The change in potential energy is given by mg(hf-hi) where hf-hi is change in height got by subtracting initial height from final height. In this case, the initial height is zero while final height is 1.78 m.
Substituting 9.81 m/s2 for g, 7.3 kg for m and h with 1.78 then the change in potential energy will be
7.3*9.81*(1.78-0)=127.47114 J
Rounded off as 127.5 J
A submarine send out a pulse of ultrasound to check how close it is to the seabed the reflected waves are detected 0.2 seconds later work out the total distance travelled by the detected wave is the speed of ultrasound is in water is 1500 M/S
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What is the job of chlorophyll in photosynthesis?
A) absorbs the sun’s energy
B) Makes CO2 for the plant
C) Reflects the 02
D) it give the plant energy
Answer:
A
Explanation:
Venus is located between the planets
Saturn and Earth
Mercury and Earth
Earth and Mars
Mars and Saturn
Answer:
venus is located between mercury and earth
Explanation:
Answer:
Mercury and Earth
Explanation:
Which term defines the amount of mechanical work an engine can do per unit of heat energy it uses? A. specific heat B. conductivity C. thermal expansion D. efficiency
Answer:
Efficiency
Explanation:
The amount of mechanical work an engine can do per unit of heat energy it uses is called its efficiency. It is also defined as the output divided by the total electrical power consumed.In terms of heat, efficiency of engine is given by :[tex]\eta=1-\dfrac{Q_o}{Q_i}[/tex]
[tex]Q_o\ and\ Q_i[/tex] are output heat and input heat respectively.
Hence, the correct option is (d) "efficiency"
Final answer:
Efficiency is the key factor defining the mechanical work output of a heat engine in relation to the heat energy input.
Explanation:
Efficiency is the term that defines the amount of mechanical work an engine can do per unit of heat energy it uses. It is calculated as the ratio of the useful work extracted to the energy input needed to heat the hot reservoir. In the context of a heat engine, efficiency plays a crucial role in determining how well the engine converts heat energy into mechanical work.
FREE BRANLIEST❗️❗️ for anyone who answers this correctly
Answer:
1.29x10^5 m
Explanation:
Step 1:
Data obtained from the question.
Mass of uranus (M1) = 8.68x10^25Kg
Mass of miranda (M2) = 6.59x10^19Kg
Force (F) = 2.28x10^19N.
Gravitational constant (G) = 6.674×10^−11 m3/kgs2
Distance apart (r) =?
Step 2:
Determination of the distance apart.
Using the Newton's law of universal gravitation equation, the distance apart of uranus and the moon miranda can be obtained as follow:
F = GM1M2/r2
r2 = GM1M2/F
r2= (6.674×10^−11x8.68x10^25x6.59x10^19)/2.28x10^19
r2 = 1.67x10^16
Take the square root of both side.
r = √(1.67x10^16)
r = 1.29x10^5 m
Therefore, the distance apart is 1.29x10^5 m
Answer:
1.29x10^5 m
Explanation:
Step 1:
Data obtained from the question.
Mass of uranus (M1) = 8.68x10^25Kg
Mass of miranda (M2) = 6.59x10^19Kg
Force (F) = 2.28x10^19N.
Gravitational constant (G) = 6.674×10^−11 m3/kgs2
Distance apart (r) =?
Step 2:
Determination of the distance apart.
Using the Newton's law of universal gravitation equation, the distance apart of uranus and the moon miranda can be obtained as follow:
F = GM1M2/r2
r2 = GM1M2/F
r2= (6.674×10^−11x8.68x10^25x6.59x10^19)/2.28x10^19
r2 = 1.67x10^16
Take the square root of both side.
r = √(1.67x10^16)
r = 1.29x10^5 m
Therefore, the distance apart is 1.29x10^5 m
John pushes forward on a car with a force of 125n while bob pushes backward on the car with a force of 225n. what is the net force on the car
The net force on the car is -100 N, and it acts in the direction of Bob's force. This means the car experiences a net force of 100 N directed backward.
To find the net force on the car, we need to consider the vector sum of the forces applied by John and Bob. Since they are acting in opposite directions, we'll use the following formula:
Net Force = Force_John + Force_Bob
Now, substitute the given values:
Net Force = 125 N + (-225 N)
Net Force = 125 N - 225 N
Net Force = -100 N
The negative sign indicates the direction of the net force, which is in the direction of the greater force (towards Bob, the direction of the 225 N force).
Which situation will have the highest resistance?
A.long wire and high temperature
B. short wire and high temperature
C. long wire and cold temperature
D.short wire and low temperature
Answer:
i think it is C
Explanation:
Answer: A. Long wire and high temperature
Explanation:
Why is it important to understand the behavior of light when designing and building any type of structure, such as a house, school, store, hospital or office building?
It is important to understand the behavior of light when designing and building any type of structure because it is necessary for the better illumination of the interior space.
What is meant by optics ?Optics is the branch of science, that deals with study of light and the behaviour and properties of light.
Here,
It is important to understand the behavior of light when designing and building any type of structure, such as a house, school, store, hospital or office building.
This is because, interior space and its arrangements are the important aspects in building any structure. So that, the designing of interior space became more important and it must be more accurate since, the adjustments of the effects of heat and light became the major needs for every architecture.
These buildings are built for people to use them or live in them, in the most comfortable way. So that, the arrangements of the windows and doors primarily depends on the distribution of light at that positions.
The present living system demands more use of electrical energy for various purposes in our everyday life. So, the availability of daylight can help us to reduce the over consumption of electrical energy in the day time.
Hence,
It is important to understand the behavior of light when designing and building any type of structure because it is necessary for the better illumination of the interior space.
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Final answer:
Understanding the behavior of light is vital in architecture due to its impact on mood, aesthetics, functionality, and energy efficiency. It informs decisions on lighting design, fixture selection, and the overall architectural design to create spaces that are functional, safe, and evoke desired emotional responses.
Explanation:
Understanding the behavior of light is crucial in the design and construction of any structure, such as houses, schools, stores, hospitals, or office buildings, due to its significant impact on both the functionality and aesthetics of a space. Light can influence mood, perception, and even the well-being of occupants.
For example, natural light can enhance productivity and happiness in offices and schools, while soft, warm lighting can make homes feel more welcoming and comforting. Furthermore, the understanding of light's properties, such as reflection, refraction, and shadow creation, plays an essential role in achieving energy efficiency, enhancing visibility, and ensuring the safety of the occupants.
Considering the architecture of a space is vital as it directly influences lighting design, necessitating a thoughtful selection of lighting fixtures and techniques that complement the structural elements and intended use of each area. Thus, integrating light-related considerations into the architectural design process facilitates the creation of functional, aesthetically pleasing, and emotionally resonant environments.
Which of the following is a high wave that crashes down onto the
ocean floor?
a. breaker
b. tide
c. upwelling
d. deflection
2. A 60 N net force is applied to a 12 kg box.
What is the acceleration of the box?
Answer:
A = 5 meters/s^2
Explanation:
Force = mass x acceleration
A = Force/mass
A = 60/12
A = 5 meters/s^2
What kind of reaction is it when heat is RELEASED in a chemical reaction, causing temperature to increase?
A)Exothermic Reaction
B)Endothermic Reaction
Answer:
A
Explanation:
EXothermic mean to release heat hit the EX almost like exit
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Which objects allow humans to access groundwater? Select three options.
A. a spring
B. a well drilled into an aquifer
C. a well drilled below the water table
D. an aquifer capped by thick granite
E. layers of soil and rock above the water table
Answer:
A. a spring & B. a well dried into an aquifer.The molecules of a substance become more closely packed and move more quickly.
What is happening to the substance?
The animal derives energy from its food to maintain its body temperature.
State the energy change that takes place
The substance is likely experiencing a phase change due to increased kinetic energy from heating. For the animal, chemical energy from food is converted into thermal energy to maintain body temperature.
When the molecules of a substance become more closely packed and move more quickly, the substance is undergoing a phase change, likely from a solid to a liquid or a liquid to a gas. This change is the result of increased kinetic energy due to heating, which causes the molecules to vibrate or translate more vigorously. As for the animal, when it derives energy from its food to maintain body temperature, the energy change taking place is the conversion of chemical energy from the food into thermal energy (heat) within the body.
A student is building a simple circuit with a battery, light bulb, and copper wires. When she connects the wires to the battery terminals, the light bulb does not light up. Which of the following could explain why the bulb does not light?
A. The is no energy source.
B. The circuit is open.
C. This circuit is too simple to light up a light bulb.
D. Copper wires do not conduct electric current.
Option B represents the correct answer.
The Bulb does not light up because the circuit is an open circuit.
Open and Closed CircuitAn electrical circuit where the energy is not flowing through the circuit is called the open circuit. In the open circuit, the continuity is broken so that the current does not flow through the circuit.
An electrical circuit where the energy is allowed to flow through the circuit by turning it on is called the closed circuit. A circuit is made closed if the electricity is flowing from an energy source to the desired endpoint of the circuit.
Given that a simple circuit is built up by a student. The circuit is made with a battery, light bulb, and copper wires. The light bulb does not light up when the copper wires are connected to the battery terminals because there is no energy flow through the circuit. It means that the circuit is an open circuit.
Hence we can conclude that the light bulb does not light up due to the no energy flow in the circuit. Option B is the correct answer.
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Which statement is true for light passing into a medium that is more optically dense than the first medium through which it passed?
The index of refraction of the second medium is lower.
The index of refraction of the second medium is higher.
The index of reflection of the second medium is lower.
The index of reflection of the second medium is higher.
The statement 'the index of refraction of the second medium is higher' is TRUE for light passing into a second medium that is more optically dense than the first medium.
The refraction index of an object is a measurement that indicates how fast light can travel through this object.The refraction index of a given material/substance can be estimated as the velocity of light of a given wavelength divided by this velocity.The higher the refraction index of an object, the closer to the expected direction the light will travel.In conclusion, the statement 'the index of refraction of the second medium is higher' is TRUE for light passing into a second medium that is more optically dense than the first medium.
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Final answer:
The correct statement is that when light passes into a medium that is more optically dense than the first medium, the index of refraction of the second medium is higher.
Explanation:
When light passes into a medium that is more optically dense than the first medium, the index of refraction of the second medium is higher. This is because a higher index of refraction indicates a more optically dense medium. Consequently, the light ray bends towards the normal -- a line perpendicular to the interface of the two media -- when transitioning from a less optically dense medium to a more optically dense one.
A runner travels 2.5 laps around a circular track in a time of 75 sec. The diameter of the track is 50 m and its circumference is 120 m. Find (a) the average speed of the runner and (b) the magnitude of the runner's average velocity. Average speed depends on the total distance traveled, whereas average velocity depends on the displacement at the end of the particular journey.
Answer:
2.67m/s
0.67m/s
Explanation:
Given parameters:
Number of laps run = 2.5laps
time taken = 75 sec
Diameter of track = 50m
Circumference = 120m
Unknown:
Average speed of runner = ?
Average velocity of runner = ?
Solution:
Average speed depends on the total distance traveled, it is the rate of change of distance with time. It covers the full extent of the path;
Average speed = [tex]\frac{distance}{time}[/tex]
distance = circumference
Average speed = [tex]\frac{200}{75}[/tex] = 2.67m/s
Average velocity depends on the displacement at the end of the particular journey. The displacement deals with the length of path from start to finish in a specific direction.
The diameter is the same as displacement here.
Average velocity = [tex]\frac{displacement}{time}[/tex] = [tex]\frac{50}{75}[/tex] = 0.67m/s
What are Mid-Ocean Ridges caused by?
Answer:
occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.
Explanation:
To increase the brightness of a desk lamp, a student replaces a 60-watt light bulb with a 100-watt bulb. Compared to the 60-watt bulb, the 100-watt bulb has
1.less resistance and draws more current
2.less resistance and draws less current
3.more resistance and draws more current
4.more resistance and draws less current
Answer:
3. more resistance and draws more current
Explanation:
According to a derivation from Ohm's law, the power, P, generated by the bulb is directly proportional to square of the current, I, passing through it. i.e
P ∝ I²
P = I²R -------------------- (i)
Where;
R = constant of proportionality called resistance
From equation (i), it can thus be deduced that the power, P, is also directly proportional to the resistance, R.
Thus;
(i) When power increases, resistance increases
(ii) When power increases, current also increases.
So for the 100-watt bulb, compared to the 60-watt bulb, there will be more resistance and more current will be drawn.
Answer:
Option 1. Less resistance and draws more current
Explanation:
To better understand this concept, let us determine the resistance and current of each bulb assuming a 240V supply.
Recall:
Power = current (I) x voltage (V)
P = IV
Power = square voltage/ resistance
P = V^2 /R
For the 60watt bulb:
Power (P) = 60watts
Voltage = 240V
Current (I) =?
Resistance =?
A. P= IV
60 = I x 240
Divide both side by 240
I = 60/240
I = 0.25A
B. P = V^2 /R
60 = (240)^2 / R
Cross multiply to express in linear form
60 x R = (240)^2
Divide both side by 60
R = (240)^2 / 60
R = 960 ohms
For 100watts bulb:
Power (P) = 100watts
Voltage = 240V
Current (I) =?
Resistance =?
A. P= IV
100 = I x 240
Divide both side by 240
I = 100/240
I = 0.42A
B. P = V^2 /R
100 = (240)^2 / R
Cross multiply to express in linear form
100 x R = (240)^2
Divide both side by 100
R = (240)^2 / 100
R = 576 ohms
Summary:
60watts bulb has a current of 0.25A and a resistance of 960 ohms
100watts bulb has a current of 0.42A and a resistance of 576 ohms.
Comparing the resistance and current of the 60watts and 100watts bulb under the same supply of 240V,
the 100watts bulb has lesser resistance than the 60watts bulb and draws more current than the 60watts bulb.
Ammonia gas occupies a volume of 0.450 L at a pressure of 96 kPa. What
volume will it occupy at standard pressure (101.3 kPa)? *
Answer:
0.426 L
Explanation:
Boyles law is expressed as p1v1=p2v2 where
P1 is first pressure, v1 is first volume
P2 is second pressure, v2 is second volume.
Given information
P1=96 kPa, v1=0.45 l
P2=101.3 kpa
Unknown is v2
Making v2 the subject from Boyle's law
[tex]v2=\frac {p1v1}{p2}[/tex]
Substituting the given values then
[tex]v2=\frac {96*0.45}{101.3}=0.4264560710760l\approx 0.426 l[/tex]
Therefore, the volume is approximately 0.426 L
To find the volume of ammonia gas at standard pressure, we applied Boyle's Law and calculated the final volume to be approximately 0.426 liters. Boyle's Law relates the pressure and volume of a gas when temperature and moles remain constant.
To determine the volume that ammonia gas will occupy at standard pressure (101.3 kPa) given its initial volume and pressure, we can use Boyle's Law. Boyle's Law states that the pressure of a gas is inversely proportional to its volume when temperature and the number of moles are held constant. The formula is as follows:
P1V1 = P2V2
Using the values provided, we can rearrange the formula to solve for V2:
V2 = (P1V1) / P2
Substitute the known values:
V2 = (96 kPa * 0.450 L) / 101.3 kPa
V2 ≈ 0.426 L
So, the volume of ammonia gas at standard pressure will be approximately 0.426 liters.
Example Problem:
A sample of ammonia is found to occupy 0.250 L under laboratory conditions of 27 °C and 0.850 atm. Find the volume of this sample at 0 °C and 1.00 atm.
A skydiver has a mass of 140 kg. At what speed will she have a momentum
of 10,000 kg•m/s?
Answer:
71.4 m/s
Explanation:
Is glucose and oxygen products reactants of cellular respiration
Answer:
Glucose and oxygen are products of photosynthesis.
Explanation:
Energy, carbon dioxide and water are products of cellular respiration. Glucose and oxygen are reactants in cellular respiration. Energy, water and carbon dioxide are reactants of photosynthesis.
Answer: Reactants
Explanation: A cell will need to break glucose to create energy. Oxygen will turn into carbon dioxide, which is what us humans breathe out.
FREE BRANLIEST COMMENT AND LIKE SOMEEBODY HELP ME I BEEN WORKING ON THIS FOR TWO DAYS AND IM SLOWY DYING. A puck moves 2.35 m/s in a -22 degree direction. A hockey stick pushes it for 0.215 s, changing its velocity to 6.42 m/s in a 50 degree direction. What is the magnitude of the displacement and Direction of displacement
Answer:
0.805 m at 32.6°
Explanation:
Given in the x direction:
v₀ₓ = 2.35 m/s cos -22° = 2.179 m/s
vₓ = 6.42 m/s cos 50° = 4.127 m/s
t = 0.215 s
Find: Δx
Δx = ½ (v + v₀) t
Δx = ½ (4.127 m/s + 2.179 m/s) (0.215 s)
Δx = 0.678 m
Given in the y direction:
v₀ᵧ = 2.35 m/s sin -22° = -0.880 m/s
vᵧ = 6.42 m/s sin 50° = 4.918 m/s
t = 0.215 s
Find: Δy
Δy = ½ (v + v₀) t
Δy = ½ (4.918 m/s + -0.880 m/s) (0.215 s)
Δy = 0.434 m
The magnitude of the displacement is:
d² = Δx² + Δy²
d² = (0.678 m)² + (0.434 m)²
d = 0.805 m
The direction of the displacement is:
θ = tan⁻¹(Δy/Δx)
θ = tan⁻¹(0.434 m / 0.678 m)
θ = 32.6°
You are an astronaut in space far away from any gravitational field, and you throw a rock as hard as you can. The rock will:
slowly slow down and stop
continue at the same speed forever
continue to accelerate at the rate it was when it left your hand
PLZ HELP QUICKLY!
Answer:
the rock will continue at the same speed unless it is affected by another force such as gravity and so if you threw it it will continue to move unless affected by a force
Explanation:
this is because Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.