If walt ran 5 kilometers in 25 minutes, going eastward. His average velocity is: 0.2 kilometers per minute.
What is the average velocity?
To determine Walt's average velocity divide the distance traveled by the time it took him.
We can use the formula:
Average velocity = Distance / Time
Plugging in the values:
Average velocity = 5 kilometers / 25 minutes
Average velocity = 0.2 kilometers per minute
Therefore Walt's average velocity is 0.2 kilometers per minute, meaning that he was running at a speed of 0.2 kilometers every minute in the eastward direction.
A particular baseball pitcher throws a baseball at a speed of 39.1 m/s (about 87.5 mi/hr) toward home plate. We use g = 9.8 m/s2 and ignore air friction.
(a) Assuming the pitcher releases the ball 16.6 m from home plate and throws it so the ball is initially moving horizontally, how long does it take the ball to reach home plate?
Suppose the shipping company were packing balls with a diameter of 2 inches instead of Cubes. Would the large box hold more balls or fewer balls than boxes? Explain your answer.
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. cockpit noise in a jet aircraft is mostly due to airflow at hundreds of miles per hour. this 3 × 3 contingency table shows 61 observations of data collected by an airline pilot using a handheld sound meter in a certain aircraft cockpit. noise level is defined as “low” (under 88 decibels), “medium” (88 to 91 decibels), or “high” (92 decibels or more). there are three flight phases (climb, cruise, descent).
Final answer:
The question addresses the impact of intense cockpit noise on pilots and the importance of hearing protection, touching on noise levels during different flight phases and potential active noise reduction solutions.
Explanation:
The question provided by the student relates to the subject of Physics, specifically concerning the topic of sound intensity levels and the effects of noise exposure on human hearing. High levels of cockpit noise can have detrimental effects on pilots, as they are exposed to these intense noise levels for prolonged periods. It is mentioned that jet aircraft noise during climb, cruise, and descent can vary, with levels sometimes reaching well above the recommended guidelines for noise exposure. The importance of ear protection is highlighted, as prolonged exposure even at 85 decibels (dB) without hearing protection can lead to hearing damage. For instance, exposure to 100 dB noise, such as the take-off of a jet plane, can lead to noise-induced hearing loss. Active noise reduction techniques, including headphones that use destructive interference, can significantly lower noise levels by as much as 30 dB, providing a potential solution to protecting pilots' hearing.
A completely submerged object always displaces its own
Archimedes' principle states that a completely submerged object always displaces its own volume of water, creating an upward buoyant force.
Explanation:In physics, an object that is completely submerged underwater will always displace its own volume of water.
This is known as Archimedes' principle, which states that the buoyant force acting on an object is equal to the weight of the fluid it displaces.
For example, if a 1 liter object is submerged in water, it will displace 1 liter of water. This displacement results in an upward force, called the buoyant force, that opposes the weight of the object.
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A group of students is investigating whether copper is a better thermal conductor than steel. The students take a copper wire and a steel wire of the same length and diameter. They put equal lengths of wax on one end of each wire and dip the other end into a beaker of hot water. The length of wax left on the wires after 10 minutes is shown.
Experimental Observations:
- Original length of wax
- Copper: 3 cm
- Steel: 3 cm
- Length of wax after 10 minutes
- Copper: 0.7 cm
- Steel: 1.8 cm
What was the dependent variable in this experiment?
a. Type of wire used
b. Original length of wire
c. Original length of wax
d. Thermal conductivity of wire
Answer: Option c: original length of wax.
In an experiment, there are three types of variables: independent, dependent, controlled or constant.
Independent variables are the ones which do not change but can be changed by the scientist. dependent variables are the ones which change when the independent variables change. This is what a scientist observes. Constant variables are the conditions which are kept the same through out the experiment.
In the given experiment, the type of wire used, the length of the wire, thermal conductivity of the wire are independent variables. The time for which the wire is dipped in the hot water, the temperature of the water are controlled variables.
The original length of the wax is a dependent variable. This is because, as the wire is changed, depending upon the thermal conductivity of the wire, the original length of the wax changes.
Actually, here’s more explaining for this question. In the given experiment, the students are investigating whether copper is a better thermal conductor than steel. To do this, they take a copper wire and a steel wire of the same length and diameter. They put equal lengths of wax on one end of each wire and dip the other end into a beaker of hot water. They then observe the length of wax left on the wires after 10 minutes.In this experiment, the dependent variable is the original length of wax. The reason for this is that the length of wax left on the wires after 10 minutes will vary depending on the thermal conductivity of the wire. The independent variables in this experiment are the type of wire used (copper or steel) and the original length of the wire. The students have control over these variables and can choose to use either copper or steel wire of the same length and diameter.The controlled variables in this experiment are the time for which the wire is dipped in the hot water and the temperature of the water. These variables are kept constant throughout the experiment to ensure that any changes in the length of wax can be attributed to the thermal conductivity of the wire and not to other factors. So, to summarize, the dependent variable in this experiment is the original length of wax, while the independent variables are the type of wire used and the original length of the wire. The controlled variables are the time for which the wire is dipped in the hot water and the temperature of the water. Therefore, option C is your answer.
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A dynamite blast at a quarry launches a rock straight upward, and 2.4 s later it is rising at a rate of 10 m/s. assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b) 5.1 s after launch.
Answer:
(a) 33.52 m/s
(b) 16.46 m/s downward
Explanation:
Part (a)To find the initial speed of the rocket, we can use the kinematic equation:
[tex]v = u + at[/tex]
where:
u is the initial velocity of the object. v is the final velocity of the object.a is the constant acceleration of the object. t is the time elapsed during the acceleration.In this case:
v = 10 m/sa = -9.8 m/s²t = 2.4 sTherefore:
[tex]10 = u + (-9.8)(2.4)[/tex]
[tex]10 = u - 23.52[/tex]
[tex]u = 10 + 23.52[/tex]
[tex]u = 33.52 \textsf{ m/s}[/tex]
So, the speed of the rock at launch is 33.52 m/s.
Part (b)We can use the same kinematic equation to find the speed at t = 5.1 s:
[tex]v = u + at[/tex]
[tex]v = 33.52 + (-9.8)(5.1)[/tex]
[tex]v = 33.52 - 49.98[/tex]
[tex]v = -16.46 \textsf{ m/s}[/tex]
The negative sign indicates that the rock is moving downward at this time.
So, 5.1 seconds after launch, the speed of the rock is 16.46 m/s downward.
Which of these statements are true about scientific theories and laws?
Theories are untested.
Laws are untested.
Laws are often expressed as math formulas.
A law is the same as a theory.
Theories are not opinions.
Answer:
Theories are not opinions.
Explanation:
Theories are all of them tested, with the scientific method in order to be accepted or refuted, then Laws are tested and are observable by any means all around the globe, the only option that is actually correct would be that Theories are not opinions because they are scientific statements that can be tested.
Answer:
theories are not opinions
Explanation:
A car accelerates from 13-m/s to 24.1-m/s in 5.4-s. what was its acceleration in m/s2?
How many kilograms are there in a 2.00 L bottle of drinking water?
John and mary are skating at an ice rink. john skates at a constant speed of 6.7 m/s, with respect to the ice surface, directly south. mary skates at a constant speed of 10.9 m/s in a direction of 28° west of south, with respect to the ice. what are the magnitude and direction of mary's velocity with respect to john? give the direction as measured relative to due south.
John and mary are skating at an ice rink. john skates at a constant speed of 6.7 m/s, with respect to the ice surface, directly south, Mary's velocity with respect to John is approximately 10.06 m/s at an angle of 102.04° south of due south.
We may use vector addition to determine the size and direction of Mary's velocity relative to John.
While John's velocity is solely in the south, Mary's velocity can be depicted as a vector moving in the south-west.
Let's break down Mary's velocity into its south and west components:
- Mary's southward velocity component [tex](\(v_{\text{south}}\)) = \(10.9 \, \text{m/s} \cdot \sin(28^\circ)\)[/tex]
- Mary's westward velocity component [tex](\(v_{\text{west}}\)) = \(10.9 \, \text{m/s} \cdot \cos(28^\circ)\)[/tex]
Now, to find Mary's velocity with respect to John, we subtract the components of John's velocity:
- Mary's velocity with respect to John [tex](\(v_{\text{MJ}}\)) = \((v_{\text{south}} - v_{\text{J}}) \hat{i} + v_{\text{west}} \hat{j}\)[/tex],
where [tex]\(v_{\text{J}} = 6.7 \, \text{m/s}\)[/tex] is John's velocity.
Calculate the components and magnitude of Mary's velocity with respect to John:
[tex]\(v_{\text{MJ}} = (10.9 \, \text{m/s} \cdot \sin(28^\circ) - 6.7 \, \text{m/s}) \hat{i} + 10.9 \, \text{m/s} \cdot \cos(28^\circ) \hat{j}\)[/tex]
[tex]\(v_{\text{MJ}} \approx -2.18 \, \text{m/s} \hat{i} + 9.76 \, \text{m/s} \hat{j}\)[/tex]
Magnitude of [tex]\(v_{\text{MJ}}\) = \(\sqrt{(-2.18 \, \text{m/s})^2 + (9.76 \, \text{m/s})^2}\)[/tex]
Magnitude of [tex]\(v_{\text{MJ}} \approx 10.06 \, \text{m/s}\)[/tex].
Now, to find the direction of Mary's velocity with respect to John [tex](\(\theta\)):[/tex]
[tex]\(\theta = \arctan\left(\frac{v_{\text{MJ,y}}}{v_{\text{MJ,x}}}\right)\),[/tex]
Calculate the direction angle:
[tex]\(\theta \approx \arctan\left(\dfrac{9.76 \, \text{m/s}}{-2.18 \, \text{m/s}}\right)\)[/tex]
[tex]\(\theta \approx -77.96^\circ\).[/tex]
Thus, since the direction is measured relative to due south, the direction of Mary's velocity with respect to John is approximately [tex]\(180^\circ - 77.96^\circ = 102.04^\circ\)[/tex] south of due south.
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Final answer:
Mary's velocity with respect to John is 5.56 m/s at 33° west of south.
Explanation:
To find Mary's velocity with respect to John, we need to find the vector difference between Mary's velocity and John's velocity. We can break Mary's velocity into its north and east components, where the north component is 10.9cos(28°) and the east component is 10.9sin(28°). John's velocity is directly south, so his velocity has no east component and his south component is 6.7 m/s.
The north component of Mary's velocity relative to John is 10.9cos(28°) - 6.7 = 4.81 m/s, and the south component is 10.9sin(28°) so the magnitude of her velocity with respect to John is √((4.81)² + (10.9sin(28°))²) ≈ 11.60 m/s.
The angle can be found using tan⁻¹((10.9sin(28°))/(4.81)) ≈ 32.75°. So, the direction of Mary's velocity with respect to John is 180° - 32.75° ≈ 147.25° west of south, which can be rounded to 33° west of south.
When the molecules in a body move with increased speed, it's possible that the body will change from a
A. liquid to a solid.
B. gas to a liquid.
C. liquid to a gas.
D. gas to a solid.
A comet near the sun whose orbit is _______________ would never be near the sun again
What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is w = 1.75 m wide and h = 8.00 m below the top of the cliff?
Final answer:
To avoid hitting the ledge when jumping from a cliff, calculate the time of flight using the height of the cliff and gravity, then use that time to find the minimum horizontal velocity needed to clear the ledge width.
Explanation:
Minimum Speed to Miss the Ledge
To find the minimum speed required for a person to miss the ledge when jumping from a cliff, one must analyze the motion in two dimensions: vertical and horizontal. The vertical distance (h) and the width of the ledge (w) are crucial to determine the time in the air and the minimum horizontal velocity needed.
The vertical motion is independent of the horizontal motion and can be analyzed using the formula for the time of flight under gravity which is t = [tex]\sqrt(2h/g)[/tex], where g is the acceleration due to gravity. Once the time of flight is calculated, we use this time to find the minimum horizontal velocity (vmin) necessary to travel the width of the ledge w by the formula vmin = w/t. This is the minimum speed the person needs just as they leave the edge of the cliff.
For a ledge 1.75m wide and cliff 8.00m high, first, calculate the time of flight with t = [tex]\sqrt((2*8.00m)/9.81m/s2)[/tex]. Then, use this time to calculate the horizontal velocity with v min = 1.75m / t.
How many times longer than the length of one year is the age of the universe?
Fiora starts riding her bike at 20 mi/h. after a while, she slows down to 12 mi/h, and maintains that speed for the rest of the trip. the whole trip of 70 mi takes her 4.5 h. for what distance did she travel at 20 mi/h?
Answer : Distance, d = 40 mi.
Explanation :
It is given that,
Fiora starts riding her bike at 20 mi/h. after a while, she slows down to 12 mi/h and maintains that speed for the rest of the trip. the whole trip of 70 mi takes her 4.5 h.
Let for t hours she traveled at 20 mi/h. So, for ( 4.5 - t) h she has traveled with a speed of 12 mi/h.
We know that,
distance covered = speed × time
20 mi/h × t +12 mi/h (4.5 h - t) = 70 mi
t = 2 h
So, the distance covered in 2 h is, d = 20 mi/h × 2 h = 40 mi.
Hence, this is the required solution.
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 3.8 m/s2 for 4.6 seconds. It then continues at a constant speed for 9.2 seconds, before applying the brakes such that the car’s speed decreases uniformly coming to rest 257.71 meters from where it started. The yellow car accelerates uniformly for the entire distance, finally catching the blue car just as the blue car comes to a stop.
How far does the blue car travel before its breaks are applied to slow down?
You replace a 40 W incandescent lightbulb with an 8 W LED bulb. If you leave your lights on 24 hours a day, how much energy are you saving each day by replacing this bulb?
By replacing a 40 W incandescent bulb with an 8 W LED bulb and leaving the lights on for 24 hours, you would be saving 768 Wh of energy per day.
Explanation:The question is asking how much energy you can save by switching from a 40 W incandescent lightbulb to an 8 W LED bulb. The energy use of a bulb is determined by its power (wattage) and the time it is turned on. To calculate the energy saved, we need to compare the energy use of the two different bulbs, when they are turned on for the same time.
Step 1: We start by calculating the daily energy consumption of the 40 W incandescent light bulb. Energy (E) in watt-hours (Wh) can be calculated using the formula E = P*t, where P is the power in watts (W) and t is the time in hours. Therefore, for the 40 W incandescent bulb used 24 hours a day: E1 = 40 W * 24 hours = 960 Wh/day.
Step 2: Then we calculate the daily energy consumption of the 8 W LED bulb. For the LED bulb: E2 = 8 W * 24 hours = 192 Wh/day.
Step 3: To find the daily amount of energy saved, we subtract the energy use of the LED bulb from the energy use of the incandescent bulb: E saved = E1 - E2 = 960 Wh/day - 192 Wh/day = 768 Wh/day. Therefore, by replacing a 40 W incandescent lightbulb with an 8 W LED bulb and leaving the lights on for 24 hours a day, you can save 768 Wh of energy each day.
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Objects A and B are brought close to each other. Object A will soon become positively charged. Identify the charge that must transfer for this situation to occur.
The following situation occurs:
The two objects are brought close to each other (but they do not touch). Object B must be negatively charged: in this case, for induction, the positive charges on object A migrate towards the side of the object closer to object B, while the negative charges migrate to the other side. Then, object A must be connected to the ground, so that the negative charges migrate to the ground: therefore, an excess of positive charges remain on object A, which is now positively charged.
Answer:
a positive charge will transfer from object b
Explanation:
a positive charge will transfer from object b to object a making a positively charged
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Consider a box sitting in the back of a pickup. The pickup accelerates to the right, and because the bed of the pickup is sticky, the box does not slide around the truck when this happens.What direction is the force acting on the box due to the truck?
Considering a box sitting in the back of a pickup. The pickup accelerates to the right, and because the bed of the pickup is sticky, the box does not slide around the truck when this happens. But the force acting on the box is left.
What is Force ?Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s².
There are two types of forces, balanced force and unbalanced force.
When Net force acting on a body is zero then we call it as balanced force. .
Unbalanced forces are those when resultant of all the forces is not equal to zero is called as unbalanced force. unbalanced force is responsible for the motion of the body.
Whatever we are talking about force in this problem is called as pseudo force, it same as we feel in the bus when we are standing in the bus suddenly driver brakes we go ahead in the bus or we feel forward force.
Pseudo force is not actual force but it can felt, centrifugal force is a type of pseudo force.
In this problem, as pickup accelerates, according to newtons first law box in the pickup tend to have its original velocity(0 if pickup is at rest or v when it is in motion). because of this when pickup accelerates right, box feel pseudo force in the opposite direction(Left).
Hence left is correct.
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% = Wo/Wi x 100 Solve for Wo
% = Wo/Wi x 100 Solve for Wi
A proton and an electron are separated by 6.5 Ã 10â10 m. (a) calculate the magnitude of the electric force that the proton exerts on the electron
We have that the magnitude of the electric force that the proton exerts on the electron
[tex]F=5.45*10^{-10}N[/tex]
From the question we are told that
proton and an electron are separated by 6.5 Ã 10â10 m
Generally the equation for the Force is mathematically given as
[tex]F=\frac{kq_1q_2}{r^2}\\\\F=\frac{9*10^{9}*(1.6*10^{-19})^2}{(6.5*10^{-10})^2}[/tex]
[tex]F=5.45*10^{-10}N[/tex]
Therefore
the magnitude of the electric force that the proton exerts on the electron
[tex]F=5.45*10^{-10}N[/tex]
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_____ bias describes when your likes and dislikes affect how you think about something.
What part of earth systems interact to form a storm like this hurricane near Florida
What is the chemical formula for mercury(I) nitrate? Hgmc021-1.jpg(NOmc021-2.jpg) Hg(NOmc021-3.jpg)mc021-4.jpg Hgmc021-5.jpg(NOmc021-6.jpg)mc021-7.jpg Hgmc021-8.jpg(NOmc021-9.jpg)mc021-10.jpg
Final answer:
The chemical formula for mercury(I) nitrate is Hg2(NO3)2, featuring a Hg₂²+ dimeric cation.
Explanation:
The chemical formula for mercury(I) nitrate is Hg2(NO3)2. This compound is created when a large excess of mercury reacts with dilute nitric acid. Mercury(I) compounds are unique because they contain a Hg₂²+ ion, which is a dimeric cation where two mercury atoms are bonded together, each with a +1 oxidation state, giving the overall molecule a +2 charge. It's important to note that the compound must be handled with care due to the toxicity of mercury compounds.
A cylindrical tube 14.0 cm high and 2.5 cm in diameter is used to collect blood samples. how many cubic decimeters (dm3) of blood can it hold (v of a cylinder = r2h)?
Jermaine runs exactly 2 laps arounda 400 meter track. What is his distance traveled?
When the temperature is cold, Tim's tires look under-inflated. This is because the air molecules in the tire ________ causing their kinetic energy to _________ and volume to _______. A) slow down, decrease, contract B) multiply, increase, fluctuates C) stay the same, increase, expand D) speed up, decrease, stay the same
A stone is thrown upward from ground level. The initial speed is 128 feet per second. How high will it go?
The stone, thrown upward with an initial speed of 128 feet per second, will reach a maximum height of 256 feet before gravity causes it to fall back to the ground.
Explanation:In the given problem, the stone is thrown upward from the ground with an initial speed of 128 feet per second. We can use the equations of motion to determine how high the stone will go. The height, h, reached by the stone can be calculated using the formula h = (v^2) / (2g), where v is the initial velocity and g is the acceleration due to gravity which is approximately 32.2 feet per second per second in standard units. Subbing in the values, h = (128^2) / (2*32.2) = 256 feet.
Therefore, the stone will reach a maximum height of 256 feet. This is the maximum height the stone reaches before it starts falling back to the ground due to gravity.
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The stone will reach a maximum height of 256 feet.
A stone is thrown upward from ground level with an initial speed of 128 feet per second. To determine how high it will go, we can use the kinematic equation:
v² = u² + 2as
where:
v is the final velocity (0 ft/s at the highest point)
u is the initial velocity (128 ft/s)
a is the acceleration (-32 ft/s² due to gravity)
s is the displacement (height)
Rearranging the equation to solve for s:
0 = (128)² + 2(-32)s
0 = 16384 - 64s
64s = 16384
s = 256 feet
Therefore, the stone will reach a maximum height of 256 feet.
How might a theory relate to a model
a person trying to throw a ball as far as possible will run forward during the throw. explain why this increases the distance of the throw
The time of flight of an object is only limited by its vertical velocity, since gravity only works to pull an object down towards the earth.
What is velocity?The terms speed and velocity give us an idea of how fast or slow an object is moving. We often come across situations where we need to identify which of two or more objects is moving faster. The faster of them can be easily distinguished if they move in the same direction on the same road. However, if their direction of movement is opposite, it is difficult to determine the fastest. In such cases, the concept of speed is useful.
The horizontal velocity remains unchanged. So by running prior to throwing the ball, the person can impart and even faster initial horizontal velocity to the ball. So, although the ball still travels for the same amount of time through the air, it travels at a faster horizontal velocity and, therefore, travels a farther horizontal distance.
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