When a student practicing for a cross country meet runs 250 m in 30 s, then her average speed would be 8.33 m/s.
What is speed?The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.
The mathematical expression for speed is given by
speed = total distance /Total time
As given in the problem a student practicing for a cross country meet runs 250 m in 30 s,
Total distance covered by the student while running = 250 m
Time is taken by the student while running = 30 seconds,
Her average speed = 250/30
=8.33 m/s.
Thus. her average speed would be 8.33 m/s.
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What best describes the temperature at which a liquid turns to gas?
A.)Melting point B.)Boiling point C.) Electrical conductivity D.)Thermal conductivity
Answer:
B) Boiling temperature.
Explanation:
Boiling temperature:
The temperature at which a liquid convert in to gas is called boiling temperature.
Ex:The boiling temperature of water is 100°C.But when we add the salt in the water then its boiling temperature will increase.
Melting temperature:
The temperature at which when solid will convert into liquid is called melting point temperature.
A ball is at rest on the floor of a car moving at a constant velocity. What will happen to the ball if the car swerves suddenly to the left, and why will this happen?
What are the properties of ionic compounds?
why did she use an infra red lamp
A car engine applies a force of 65 kN how much work is done by the engine as it pushed a car distance of 75m?
The mathematical definition of work is simply the product of force and distance. That is:
Work = Force * Distance
Hence the work done here by the engine is:
Work = 65 kN * 75 m
Work = 4,875 kJ
The work done on the car when a force of 300 N is applied opposite to the direction of motion over a distance of 25 meters is -7500 Joules.
The question requires us to calculate the work done on a car when a force is applied opposite to the direction of its motion while it travels a certain distance.
Work is calculated using the formula:
Work (W) = Force (F) × Distance (d) × cos(θ)Since the force is applied opposite to the direction of the car's motion, the angle θ between the force and the direction of motion is 180 degrees, and cos(180°) = -1.
Given:
Force (F) = 300 NDistance (d) = 25 mThe work done on the car is:
W = 300 N × 25 m × cos(180°)W = 300 N × 25 m × (-1)Work (W) = -7500 J (Joules)The negative sign indicates that the work is done against the car's direction of motion, which effectively slows it down.
describe the relationship between work and power (essay)
a wagon is being pushed eastward with a force of 80n. the frictional force opposing the motion is 35n west. the wagon experiences a 60n gravitational force pulling downward. the ground counteracts that force with a normal force pushing upward. if the net force acting on the wagon is 45n east, what is the normal force pushing upward on the wagon?
an airplane is traveling 735 KM/H and direction 41.5 west of north find the component of the velocity vector in the notherly and in Westerly directions how far north and how far west has the plane traveled after 3.00h
Answer:
[tex]v_x = 550.5 km/h[/tex] Along North
[tex]v_y = 487 km/h[/tex] Along West
[tex]d_{west} = 1461 km[/tex] Along West
[tex]d_{north} = 1651.5 km[/tex] Along North
Explanation:
Velocity of Airplane is given as
[tex]v = 735 km/h[/tex] at 41.5 degree West of North
now we know that
Along North Direction
[tex]v_x = v cos41.5[/tex]
[tex]v_x = 550.5 km/h[/tex]
Along West direction
[tex]v_y = 735 sin41.5[/tex]
[tex]v_y = 487 km/h[/tex]
Now distance moved by the plane in 3.00 h is given as
Along west
[tex]d_{west} = 487 \times 3[/tex]
[tex]d_{west} = 1461 km[/tex]
Along North
[tex]d_{north} = 550.5 \times 3[/tex]
[tex]d_{north} = 1651.5 km[/tex]
Oceanography Meteorology Environmental science is an important discipline of Earth and space science that focuses on events in the atmosphere. Scientists of this discipline also research Earth’s changing woodlands sea waves climate . Geology is another discipline of Earth and space science. It examines different types of rocks landmarks constellations to learn about how Earth was formed. Two useful tools that geologists use are a tooth and nail nut and bolt hammer and lens .
It takes a car 1.75 h (1 hour and 45 minutes) to go from mile marker 10 to mile marker 115. What is the average speed of the car?
In the water cycle, water vapor evaporates into the atmosphere and forms clouds through condensation. What happens in the atmosphere to the water in order for the clouds to form?
A) Water drops mix with air pollution to form clouds.
B) The evaporated water warms up and moves closer together.
C) The evaporated water cools and drops get closer together.
D) The sun heats the evaporated water and the water drops move faster.
The evaporated water cools and drops get closer together happens in the atmosphere to the water in order for the clouds to form.
What is water cycle?The continual flow of water from the earth's surface to the atmosphere and back to the ground is known as the water cycle, or hydrologic cycle. It is a never-ending process. As a result, it lacks a beginning and an end. As a result, water has been in motion on earth since the planet's formation. In the process, water transitions between the solid, liquid, and gas phases. The water cycle is aided by a number of elements, including the sun and air currents, to mention a few.
Water from wells, lakes, ponds, the sea, rivers, and many other sources evaporates throughout the daytime in the presence of sunshine, and this water vapor rises with the heated air. The air cools as it rises, causing water vapor to condense into tiny droplets that eventually become clouds.
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What is the result of 1.58 divided by 3.793 written with the correct number of significant figures?
The result of 1.58 divided by 3.793, when rounded to the correct number of significant figures, is 0.417.
Explanation:When calculating 1.58 divided by 3.793 and expressing the answer with the correct number of significant figures, it's important to look at the number of significant figures in both of the numbers we are dividing. The number 1.58 has three significant figures, and the number 3.793 has four significant figures. In division, the rule is that the final answer should be expressed with the same number of significant figures as the number with the least amount of significant figures used in the calculation.
The result of the division is 0.4165877..., but when rounded to three significant figures, the answer is 0.417. This is because we must express our answer with only three significant figures as dictated by the least number of significant figures present in the math problem (which is from 1.58).
Gravitron can be weakened by explaining the difference between distance and displacement. What is the difference?
Final answer:
Distance is a scalar quantity denoting the total path length traveled, while displacement is a vector quantity signifying the change in position in a specific direction from start to end point.
Explanation:
The difference between distance and displacement lies in their definitions. Distance refers to the total length of the path traveled irrespective of direction, and is considered a scalar quantity because it only has magnitude. Conversely, displacement is a vector quantity, which means it has both magnitude and direction. Displacement is defined as the straight line distance in a specific direction from the starting point to the ending point.
For example, if you walk around a track that forms a perfect 400-meter circle and end up at the starting point, your distance traveled would be 400 meters, but your displacement would be zero, as there was no change in your position from start to finish. If, however, you walk a straight line from the start to a point 100 meters away, your distance and your displacement would both be 100 meters, the latter also including the direction from the starting point.
In physics, for calculating work done or gravitational force, it is important to consider displacement rather than just distance, since direction is a vital component of these calculations.
with radiocarbon dating scintists compare an object carbon 14 levels with .....
With radiocarbon dating scientists compare an object carbon 14 levels with the fossil or rock for which the age measurement is required
Explanation:Radiocarbon, or carbon 14, is an isotope of the element carbon that is unstable and weakly radioactive. The carbon-14 method was developed by the American physicist Willard F. Libby about 1946. It can be used to determine the age of a rock or a fossil by comparing the specimen of the required or fossil and compared it with the carbon 14 sample. Carbon 14 decays at constant rate therefore an estimate of the date at which an organism died can be made by measuring the amount of its residual radiocarbon and comparing it with Carbon 14.
If plants produce oxygen as a result of photosynthesis why aren't oxygen levels continually increasing the atmosphere
Oxygen levels aren't continually increasing in the atmosphere as a result of
animals and humans making use of it.
During photosynthesis, plants manufacture food through the reaction
between carbondioxide(from animals) and water to produce glucose and
oxygen . The oxygen produced is used by animals for cellular respiration
and other metabolic activities.
The oxygen levels isn't increasing but rather it remains slightly constant as a
result of the oxygen being used by animals.
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Final answer:
Oxygen levels in the atmosphere do not continually increase because it is consumed through various processes such as respiration, decomposition, and combustion. It can also react to form ozone or be sequestered by geological activities. The rate of photosynthesis is further limited by factors like temperature and the availability of CO₂.
Explanation:
If plants produce oxygen as a result of photosynthesis, why aren't oxygen levels continually increasing in the atmosphere? The answer lies in the balance of various processes on Earth. While plants do produce oxygen through the process of photosynthesis, there are other processes that consume oxygen and balance out its levels in the atmosphere.
The free oxygen produced by photosynthesis began accumulating in our atmosphere about 2.4 billion years ago. Initially, interactions with Earth's crust and the oceans absorbed much of this oxygen. Over time, life evolved to use oxygen for respiration, which consumes oxygen and produces carbon dioxide. Today, plant and animal respiration, decomposition, and the combustion of organic matter all use oxygen and prevent it from continually accumulating in our atmosphere.
Additionally, the oxygen produced can react with various elements and compounds, such as the formation of ozone in the upper atmosphere, or can be sequestered through the burial of organic matter due to geological activities. This burial of organic carbon helps to remove carbon from the cycle, preventing it from recombining with oxygen to form CO₂.
Moreover, the rate of photosynthesis can be limited by factors such as temperature and the availability of CO₂. Even though some processes can increase photosynthesis, like higher temperatures, if the concentration of CO₂ is not sufficient, the overall rate of photosynthesis will not continue to rise, hence not infinitely increasing the oxygen levels.
An objects velocity will not change unless it is acted upon by ( balanced or unbalanced) forces?
a 1000 kg car traveling at 30 m/s suddenly stops in 5 seconds. how much force was used to stop the car?
To stop a 1000 kg car traveling at 30 m/s in 5 seconds, a force of 6000 N is required, calculated using Newton's second law of motion. The negative sign indicates deceleration.
Calculating the Force to Stop a Car
To determine the force needed to stop a 1000 kg car traveling at 30 m/s in 5 seconds, we use the formula derived from Newton's second law of motion: Force (F) = mass (m) x acceleration (a).
Step-by-Step Calculation:
Calculate the acceleration (a): Since the car comes to a stop, the final velocity (v) is 0. The initial velocity (u) is 30 m/s, and the time (t) is 5 seconds. Using the formula for acceleration: a = (v - u)/t:
a = (0 - 30 m/s) / 5 s = -6 m/s²
Calculate the force (F): Using the mass of the car (m = 1000 kg) and the acceleration (a = -6 m/s²), we apply Newton's second law:
F = m * a = 1000 kg * (-6 m/s²) = -6000 N
The negative sign indicates that the force is acting in the direction opposite to the car's motion (deceleration). The magnitude of the force is 6000 N.
What can be found by counting the number of troughs per second in a wave diagram
Answer:
C is the answer
Is NaCH an element? Why or why not?
Frost wedging occurs when water seeps into a crack in a rock, freezes, and causes the crack in the rock to widen.
true or false
a boat accelerates at a rate of 6.0m/s down a river. how much time will it take the boat to speed up to 7.0m/s?
A bolt drops from the ceiling of a moving train car that is accelerating northward at a rate of 2.50 m/s^2. (a.) What is the acceleration of the bolt relative to the train car? (b.) What is the acceleration of the bolt relative to the earth?
The bolt's acceleration relative to the train car is 0 m/s², and relative to the Earth, it has a horizontal component of 2.50 m/s² and a vertical component of 9.81 m/s².
Explanation:The student is asking a physics question related to relative acceleration. (a) The acceleration of the bolt relative to the train car is 0 m/s² since it was initially at rest with respect to the train car before dropping. (b) The acceleration of the bolt relative to the Earth combines the acceleration due to gravity and the acceleration of the train. This results in a compound acceleration where the horizontal component is 2.50 m/s² (train's acceleration) and the vertical component is 9.81 m/s² (gravity's acceleration).
How does the law of conservation of mass apply to this reaction AL +3HCL H2 + ALCL3?
[tex]2 Al + 6 HCl \rightarrow 3 H_2 + 2Al Cl_3[/tex]
Explanation:
In order for the law of conservation of mass to be valid for this reaction, we must balance the atoms of each element so that it is the same in the reactant side and the product side.
In this case, we immediately see that the hydrogen (H) is not balanced: we have 3 on the left and 2 on the right. So, we must put a factor 2 on the [tex]3HCl[/tex] on the left and a factor 3 on the [tex]H_2[/tex] on the right. Now the Cl is no longer balanced (6 on the left and 3 on the right), so we must put a factor 2 in front of [tex]Al Cl_3[/tex]. And to balance the Al, we must add a coefficient 2 in front of the Al on the right.
Summarizing everything, the balanced reaction is:
[tex]2 Al + 6 HCl \rightarrow 3 H_2 + 2Al Cl_3[/tex]
Ipe ( pronounced ee-pay ) is a Brazilian hardwood that can be used as a durable (and expensive!) construction material for decks, docks and other outdoor projects.Every cubic foot of ipe weighs 69 pounds. Use dimensional analysis to convert the density of ipe to g/cm^3. How does the density compare to other woods and material on the list above?
Which formula can be used to find the tangential speed of an orbiting object?
An upward force is applied to a 6.0–kilogram box. This force displaces the box upward by 10.00 meters. What is the work done by the force on the box?
Answer:
not A. 6.0x10^1 on clever/plato
Explanation:
got it wrong
Four football players are running down the field at the same speed. Player 1 weighs 180 lbs and is running toward the south goal, player 2 weighs 200 lbs and is running toward the north goal, player 3 weighs 190 lbs and is running toward the north goal, and player 4 weighs 165 lbs and is running toward the south goal. Which player has the most momentum?
fossil fuels are formed by the decomposition of dead plants and animals. which flow chart describes the correct energy transformation when a car burns fossil fuels to accelerate
The correct flow chart for the energy transformation, when a car burns fossil fuels to accelerate, is:
chemical energy → mechanical energy → thermal energy
When a car burns fossil fuels to accelerate, the energy transformation involves several stages. Initially, the chemical energy stored in fossil fuels, such as gasoline or diesel, is released through combustion in the car's engine. This combustion process converts the chemical energy into mechanical energy, which is utilized to move the car forward by driving the pistons, crankshaft, and ultimately the wheels.
However, not all of the mechanical energy generated is efficiently converted into kinetic energy to propel the car; some of it is lost as waste heat. This waste heat represents the thermal energy produced during the combustion process and is dissipated into the environment through the car's exhaust system and engine cooling system. Therefore, the correct energy transformation sequence is: chemical energy → mechanical energy → thermal energy.
Complete Correct Question:
Fossil fuels are formed by the decomposition of dead plants and animals. Which flow chart describes the correct energy transformation when a car burns fossil fuels to accelerate?
A. chemical energy → thermal energy → mechanical energy
B. thermal energy → mechanical energy → chemical energy
C. chemical energy → mechanical energy → thermal energy
D. thermal energy → chemical energy → mechanical energy
Which organelle is most like a factory delivery driver?
A: lysosome
B: endoplasmic reticulum
C: cytoplasm
D: nucleus
correct answer is B: endoplasmic reticulum
What is endoplasmic reticulum ?Endoplasmic reticulum is a network of membrane inside a cell through which proteins and other molecule move .
The endoplasmic reticulum is like factory conveyer belt . It helps to transport material within the cell . It provide rote to deliver drugs bypassing the acid pH , hydrolytic environment of the lysosome. It synthesis and transports , protein folding , lipid ,carbohydrate metabolism and calcium storage .
correct answer is B: endoplasmic reticulum
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Scientists connect data points on graphs with a dashed line because information between the plotted data is:
1) approximate
2) inferred
3) interpolation
4) all of the above
Answer:
4) all of the above
Explanation:
In numerical analysis through graphs, interpolation is done where in new data points which lie in the range of a set of known data values to find the approximate value which also means to infer an known intermediate value. A dashed line is drawn between the plotted data to estimate the value of the function in between.
Thus, the correct option is (4)