Answer:
Part a)
[tex]v_{avg} = 37.5 m/s[/tex]
Part b)
[tex]a = 2.25 m/s^2[/tex]
Part c)
[tex]d = 750 m[/tex]
Explanation:
Part a)
Since we know that bus is moving uniformly from initial speed of 15 m/s to 60 m/s in 20 seconds
So we will have
[tex]v_{avg} = \frac{d}{t}[/tex]
we know that
[tex]d = \frac{v_f + v_i}{2} t[/tex]
so we have
[tex]v_{avg} = \frac{v_f + v_i}{2}[/tex]
[tex]v_{avg} = \frac{15 + 60}{2}[/tex]
[tex]v_{avg} = 37.5 m/s[/tex]
Part b)
As we know that acceleration is rate of change in velocity
so it is given as
[tex]a = \frac{v_f - v_i}{t}[/tex]
[tex]a = \frac{60 - 15}{20}[/tex]
[tex]a = 2.25 m/s^2[/tex]
Part c)
distance moved by the bus is given as
[tex]d = v_{avg} \times t[/tex]
[tex]d = 37.5 \times 20[/tex]
[tex]d = 750 m[/tex]
A bowling ball collides with a pin and pushes the pin toward the right. Which describes the reaction force?
A.The pin pushes the bowling ball toward the right.
B.The pin pushes the bowling ball toward the left.
C.The bowling ball pulls the pin toward the right.
D.The bowling ball pulls the pin toward the left.
Answer:
B.The pin pushes the bowling ball toward the left.
Explanation:
As stated by Newton's third law:
"When any object A exerts a force on another object B, then object B exerts an equal and opposite force on object B". These two forces are called action and reaction.
In this example, the ball is our object A, while the pin is object B. We are told that the ball exerts a force on the pin, toward the right: therefore, the pin must exerts an equal and opposite force on the ball. So this force will be in the opposite direction, therefore toward the left.
Answer:
It’s B
Explanation:
Hope this helps!
What can be found by counting the number of troughs per second in a wave diagram
Answer:
C is the answer
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.
A car manufacturer wants to change its car’s design to increase the car’s acceleration. Which changes should the engineers consider making to the design?
increase the force that the engine provides
decrease the force that the engine provides
increase the mass of the car
decrease the mass of the car
increase the top velocity the car can travel
decrease the top velocity the car can travel
Answer:
a and d
Explanation:
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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Is NaCH an element? Why or why not?
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
Which factors cause kinetic energy to increase?
increases in mass and decreases in velocity
increases in mass and velocity
decreases in mass and velocity
decreases in mass and increases in velocity
Kinetic energy increases with increases in both mass and velocity, with velocity having a more significant impact due to its squared relationship in the kinetic energy formula KE = 0.5 x m x v².
The factors that cause kinetic energy to increase are an increase in mass and an increase in velocity. From the information given, kinetic energy is proportional to the mass of an object and to the square of its velocity, which is represented by the equation KE = 0.5 times m times v². Therefore, if we double the mass of an object, its kinetic energy would double, and if we double its velocity, its kinetic energy would quadruple, demonstrating a much more significant increase in kinetic energy with an increase in velocity. This principle underscores the profound influence of velocity on kinetic energy variations, elucidating the intricate interplay between mass, velocity, and energy manifestations in physical systems.
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).
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)
How might you cause an endothermic Chemical change to begin keep going?
Ingrid kicks a football with an initial velocity of 12 m/s at an angle of 45 degrees relative to the ground. The horizontal component of the initial velocity to the nearest tenth is?
Answer:
8.5m/s
Explanation:
Given the initial velocity to be 12m/s at an angle of 45° to the ground. The horizontal component of the velocity can be expressed as U cos (theta) where;
U is the initial velocity of the object
theta is the angle between the initial velocity and the horizontal. Mathematically, Ux = Ucos(theta)
Ux = 12cos45°
Ux = 12×1/√2
Ux = 12×√2/2
Ux = 6√2m/s
Ux = 8.48m/s
Ux = 8.5m/s(to nearest tenth)
What is the name of the group of elements that are human-made and do not occur in nature?
The correct answer is Actinides.
Natural selection. Darwin hypothesized that there requisites for natural selection to occur and that there are definite steps to natural selection. Note the two models seen here. Both of the models illustrate an important requisite for natural selection. That is:
A) sexual reproduction must occur.
B) there is survival of the fittest.
C) variation in the population exists.
D) genetic sameness reduces the chances of natural selection.
Answer:c) variation in the population exists
Explanation:
Answer: C) variation in the population exists.
Explanation:
Based on Darwin, the most important requisite for natural selection is the variance in the genetics of the individuals of some species.
These differences, produced by mutations, may have a positive effect or a negative effect in the life of the subjects, where, statistically, the positive mutations will prevail as the species reproduces.
So the right answer would be C, Variation in the population exists.
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?
Who is given credit for recognizing that elements are the basic building blocks of matter? A. John Dalton B. Dmitri Mendeleev C. Niels Bohr D. Charles Darwin
a 100 kg object is pulled vertically upwards by a constant force of 4000 N for a distance of 20.0 m. what is the work done by the net force on the object?
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
When you turn on a battery-powered flashlight, you transform
A. heat energy into light and chemical energy.
B. chemical energy into electrical energy and light.
C. heat energy into chemical energy and light.
D. electrical energy and light energy into chemical energy.
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?
the property of a moving object to continue moving is what galileo called
A. velocity
B. speed
C. accelerating
D. intertia
E. direction
Calculate the weight(force of gravity) of a 10 kg child.
A. 10 N
B. 98 kg
C. 10 kg
D. 98 N
The weight(force of gravity) of the child is: D. 98 Newton.
Given the following data:
Mass of child = 10 kgWe know that the acceleration due to gravity (a) of an object on planet Earth is equal to 9.8 meter per seconds square.
To calculate the weight(force of gravity) of the child:
Mathematically, the weight(force of gravity) of an object or body is calculated by using the following formula;
[tex]Weight = mg[/tex]
Where:
m represents the mass of an object. g is the acceleration due to gravity.
Substituting the given parameters into the formula, we have;
[tex]Weight = 10[/tex] × [tex]9.8[/tex]
Weight(force of gravity) = 98 Newton
Therefore, the weight(force of gravity) of the child is 98 Newton.
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Describe a time when an illustration would be helpful in everyday activities
Kinetic energy and mass are____ proportional.
Answer:
Kinetic energy and mass are directly proportional.
Explanation:
The kinetic energy of an object is given by:
[tex]K=\frac{1}{2}mv^2[/tex]
where
m is the mass of the object
v is the speed of the object
From the equation above, we see that the kinetic energy (K) depends linearly on the mass (m), so kinetic energy and mass are directly proportional to each other.
Match the term with the definition.
Match Term Definition
Atom A) a substance that cannot be broken down into a simpler substance
Element B) a tiny piece of matter
Particle C) a unique form of matter in which it can exist
Phase D) the basic unit of an element
In the field of Chemistry, an Atom is a tiny piece of matter, an Element is a substance that cannot be broken down into a simpler substance, a Particle is the basic unit of an element, and a Phase is a unique form of matter in which it can exist.
Explanation:The correct matches for these definitions are as follows:
Atom - B) a tiny piece of matter Element - A) a substance that cannot be broken down into a simpler substance Particle - D) the basic unit of an element Phase - C) a unique form of matter in which it can existThese are basic terms in chemistry and understanding them can help you in your study of matter, its properties, and how it changes.
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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 .
What is the color of the stars with the highest surface temperature and what is the color of the stars with the lowest surface temperature?
The color of stars with the highest surface temperature is bluish, and the color of stars with the lowest surface temperature is reddish.
The color of a star primarily depends on its surface temperature. Hotter stars emit more energy and tend to appear bluish, while cooler stars emit less energy and appear reddish. This is due to the fact that hotter objects emit more high-energy, short-wavelength light, which corresponds to the blue end of the spectrum. Conversely, cooler objects emit more lower-energy, long-wavelength light, associated with the red end of the visible spectrum. For example, a star with a surface temperature around 10,000 °C will appear blue or bluish-white, while a star with a surface temperature around 3,000 °C will appear red. This correlation between color and temperature is vital for astronomers, as the color index provides a way to measure the temperatures of stars. The color of stars effectively acts as a sort of cosmic thermometer, allowing astronomers to deduce various characteristics of a star including its size, age, and chemical composition.
If the thermal energy of the system increases by 400 J, and 1,100 J of heat were added to the system, how much work did the system do?
A. 1,500 J
B. 700 J
C. 400 J
D. 1,100 J
Answer:
700j
Explanation:
Is there a bigger planet than the sun
student uses a magnet to move a 0.025 kg metal ball magnet exerts a force of 5N which causes the ball to begin moving what is the accelaration of the ball when it begins to move
Student uses a magnet to move a 0.025 kg metal ball magnet exerts a force of 5 N which causes the ball to begin moving than the acceleration of the ball when it begins to move is 200 m/s².
What is force?A force in physics is an effect that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Given in the question student uses a magnet to move a 0.025 kg metal ball magnet exerts a force of 5 N then the acceleration is given as,
F = ma
a = F/m
a = 5/0.025
a = 200 m/s²
The acceleration of the ball when it begins to move is 200 m/s².
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