Answer
Friction between the wheels and the ground, normal force, and friction force in the brakes.
Explanation
A truck moves on the surface simply because the driving force is greater than frictional force. The is always the normal force acting perpendicularly on the ground. The frictional force will be applying in two areas that is in the brakes and between the road and the wheels.
So, the forces exerted on the object are; friction and the normal force.
Final answer:
The pram starts moving when the applied force reaches 75 N due to static friction, and then it can be kept moving with a force of 37.5 N due to kinetic friction. The coefficients of static and kinetic friction are 0.75 and 0.375, respectively.
Explanation:
When the pram's brakes are locked, it requires a certain amount of force to overcome the static friction and get it moving. According to the question, the pram starts moving when the applied force is three-quarters of the normal force, which is 100 N.
Therefore, the force required to start moving the pram is (3/4) × 100 N = 75 N. Static friction is what prevents the pram from starting to move until this force is applied.
Once the pram starts moving, the force required to keep it moving drops to half of the force required to start moving it, which is (1/2) × 75 N = 37.5 N, indicating the kinetic friction between the pram and the surface is now in effect.
The coefficient of static friction (μs) is calculated using the formula μs = (force of static friction)/(normal force) = 75 N / 100 N = 0.75. Similarly, the coefficient of kinetic friction (μk) = (force of kinetic friction)/(normal force) = 37.5 N / 100 N = 0.375.
Through which does light travel best?
Steel has a density of 7.8 g/cm3. what is the mass of a block of steel with a volume of 600.0 cm3?
The mass of a steel block with a volume of 600.0 cm3 and a density of 7.8 g/cm3 is 4680 grams, or 4.68 kilograms.
To calculate the mass of a block of steel given its density and volume, you use the formula mass = density imes volume. Since the density of steel is given as 7.8 g/cm3 and the volume of the block is 600.0 cm3, you can find the mass by multiplying these two numbers together. Therefore, the mass of the steel block is 7.8 g/cm3 imes 600.0 cm3 = 4680 grams or 4.68 kilograms when converted to kilograms.
Turquoise is what types of rocks sedimentary, metamorphic or igneous
When a constant force acts on an object, what does the object's change in momentum depend upon? check all that apply. check all that apply. the change in momentum depends upon the change in the velocity of the object. the change in momentum depends upon the mass of the object. the change in momentum depends upon the change in the position of the object. the change in momentum depends upon the time interval during which the force acts. the change in momentum depends upon the magnitude of the force?
Answer: These are correct
1) The change in momentum depends upon the change in the velocity of the object
2) The change in momentum depends upon the mass of the object
3) The change in momentum depends upon the magnitude of the force
4) The change in momentum depends upon the time interval during which the force acts.
Explanation:
Newton's second law of motion tells us that the net force applied to an object equals its ________.
Which of the following is an accurate statement?
A. AC Generators produce current that is pulsating, but always remains positive.
B. Step-down voltage transformers have a different number of turns in the primary than in the secondary winding, so they change the incoming voltage to a higher voltage.
C. DC Generators produce current with a voltage that changes from positive to negative.
D. Step-up voltage transformers have a lower number of turns in the primary than in the secondary winding.
Which method will correctly determine whether the forces on an object are balanced or unbalanced?
Add the forces in the horizontal direction to the forces in the vertical direction.
Add the forces in the horizontal and vertical directions separately.
Subtract the forces in the horizontal direction from the forces in the vertical direction.
Subtract the forces in the vertical direction from the forces in the horizontal direction.
Environmental factors can cause various changes in ecosystems. Which of the following would most likely have the greatest lasting effect on an ecosystem
*100% CORRECT ANSWERS
Question 1
Climate warming trends allow plant and insect species to inhabit larger ranges.
True
Question 2
What is a possible consequence of climate change to species that have a narrow temperature tolerance range?
all of the above
Question 3
Which of the following is not a possible effect of rising carbon dioxide levels on plants?
increased plant mortality
Question 4
How does an early onset of spring through climate change affect plants?
their growing and flowering season starts earlier and is longer
Question 5
Environmental factors can cause various changes in ecosystems. Which of the following would most likely have the greatest lasting effect on an ecosystem?
change to the landscape from construction
Question 6
How does change to an ecosystem that results in succession benefit the ecosystem?
it leads to an increased level of biodiversity
Question 7
How do the benefits of natural change to ecosystems compare to the disadvantages?
the benefits outweigh the disadvantages
Question 8
Environmental factors can have various effects on ecosystems. In August 2005, Hurricane Katrina caused significant damage in several states along the Gulf Coast, including Alabama, Mississippi, and Louisiana. Thousands of people were evacuated from their homes due to flooding and other damage caused by the storm. What environmental impact would Hurricane Katrina not have caused?
early onset of spring
Question 9
Rising levels of carbon dioxide most likely
have a greater detrimental effect on the sea
Question 10
Which scenario best describes how climate trends might affect animal migration?
animals found at the equator may move north
A 4 kg car with frictionless wheels is on a ramp that makes a 25° angle with the horizontal. The car is connected to a 1 kg mass by a string that passes over a frictionless pulley.
What is the acceleration of the car?
It takes 3.3 j of work to stretch a hooke's-law spring 15 cm from its unstressed length. how much the extra work is required to stretch it an additional 11.3 cm? answer in units of j.
Final answer:
The extra work required to stretch the Hooke's-law spring an additional 11.3 cm is 0.9375 J.
Explanation:
To find the extra work required to stretch the Hooke's-law spring an additional 11.3 cm, we can use the formula for the work done by a spring force: W = ½kx², where W is the work done, k is the spring constant, and x is the displacement. Given that it takes 3.3 J of work to stretch the spring 15 cm, we can first find the spring constant:
k = 2W / x² = 2(3.3 J) / (0.15 m)² = 146.67 N/m
Now we can calculate the extra work required to stretch the spring an additional 11.3 cm:
W' = ½kx'² = ½(146.67 N/m)(0.113 m)² = 0.9375 J
An ideal gas undergoes an adiabatic process and does 25 joules of work on its environment. What is the change in internal energy? a.50 joules b. 25 joules c. 0 joules d. -25 joules
Answer:
The change in internal energy will be 25 J.
Explanation:
Given that,
Work done = 25 J
Using first law of thermodynamics
The internal energy is sum of the heat and work done.
[tex]\Delta U= Q+ W[/tex]
Where, [tex]\Delta U[/tex] = Change in internal energy
Q = heat
W = work done
In adiabatic process, the heat does not change, it remains constant.
So the heat Q = 0
Therefore, The change in internal energy will be
[tex]\Delta U=0+25 J[/tex]
[tex]\Delta U= 25 J[/tex]
Hence, The change in internal energy will be 25 J.
Which theory is closest to the cognitive arousal theory
A) cannon-bard theory
B) Lazarus cognitive-meditational theory
C) common sense theory
D) james-lange theory
The correct answer is option B, Lazarus cognitive-meditational theory
According to the Lazarus cognitive-meditational theory, proposed by Lazarus, a stimulus can lead to the generation of personal meaning due to the cognition. This further stimulates both arousal and the emotion.
For example – If we suddenly hear scream of a group of people, the first thought that will come to our mind is the that there is something potentially dangerous and this generate both physiological responses such as rapid heart rate and trembling, and the subjective experience of fear.
Rowdy Ron, a racecar driver with a mass of 70kg, survived a crash at 175km/h. He came at rest ib only 0.027 seconds
An object has a mass of 20 g and a volume of 5 cm3. what is the object's density? 4 g/cm3 100 g/cm3 0.25 g/cm3
4. Which statement best describes the movement of particles when a wave travels through a medium? The particles are (10 points)
A. moved along in a forward motion with the wave as it travels through the medium.
B.gathered by the energy of the wave and move along in the direction of the wave.
C. permanently displaced in a direction opposite to the direction of the wave.
D.temporarily displaced and return to their normal position when the wave passes.
Answer:
D.temporarily displaced and return to their normal position when the wave passes.
Explanation:
When a wave propagates in a medium, it does going through the particles that exist in that space.
Those are altered by the wave that crosses them but, that phenomenon only lasts the time takes to pass through, then the particles return to their natural state.
Question 6. B) and c)
A certain car is accelerating at 5.0 km/h/s. Explain what is happening to the motion of the car.
What best describes the energy in a closed system at the beginning of a day and the energy at the end of the same day? Check all that apply.
Some energy can disappear after it has caused motion.
Some energy can be changed from one form to another.
Some energy can be lost to the environment around the system.
The total initial energy will be equal to the total final energy.
The total initial energy will be greater than the total final energy.
Friction can cause energy to be destroyed during the day.
Friction can cause the amount of thermal energy to increase.
The options which are apply on it;
2. Some energy can be changed from one form to another.
4. The total initial energy will be equal to the total final energy.
7.Friction can cause the amount of thermal energy to increase.
Energy can not be created or destroyed it can only be converted from one form to another.
If you put a straw into a glass of water, the straw looks to be bent, although nothing has really happened to the straw. The term that describes this property of light is
Answer:
Because it is refracting
list three commonly used units for speed
An object of mass 0.5 kg is swung in uniform circular motion. The radius is 2 meters, and the force exerted is 4 N. Calculate the magnitude of the velocity.
The magnitude of the velocity swung in uniform circular motion is equal 4 m/s.
Given the following data:
Mass of object = 0.5 kgRadius = 2 metersForce = 4 NewtonTo calculate the magnitude of the velocity:
Mathematically, centripetal force is given by the formula:
[tex]F_c = \frac{mv^2}{r}[/tex]
Making v the subject of formula, we have:
[tex]V = \sqrt{\frac{F_c r}{m} }[/tex]
Substituting the parameters into the formula, we have;
[tex]V = \sqrt{\frac{4 \times 2}{0.5} }\\\\V = \sqrt{\frac{8}{0.5} }\\\\V =\sqrt{16}[/tex]
V = 4 m/s
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When you sneeze, the air in your lungs accelerates from rest to 155 km/h in approximately 0.70 s . what is the acceleration of the air in m/s2?
Final answer:
Acceleration is the rate of change of velocity over time. The acceleration of the air in m/s² when sneezing at 155 km/h in 0.70 s is approximately 61.51 m/s².
Explanation:
Acceleration is the rate of change of velocity over time. In this case, the air in your lungs accelerates from rest to 155 km/h in approximately 0.70 s. To calculate the acceleration in m/s², we convert the final velocity to m/s and use the formula for acceleration.
Given: Initial velocity = 0 m/s, Final velocity = 155 km/h = 43.06 m/s, Time = 0.70 s. Acceleration = (Final velocity - Initial velocity) / Time.
Substitute the values: Acceleration = (43.06 m/s - 0 m/s) / 0.70 s = 61.51 m/s².
An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of _____ amu. (Enter a whole number.)
Answer:
4+5=9 amu
Explanation:
Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.
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What properties determine the amount of inertia an object has?
Which category of materials does concrete belong to and why?
1. It’s a synthetic polymer because it’s a product of a chemical reaction.
2. It’s an alloy because it contains layers of different components.
3 .It’s a ceramic because it contains substances such as sand and clay.
4. It’s a composite because it’s a mixture of cement, sand, and other granular pieces.
Answer:
Correct Answer is option 4 (It’s a composite because it’s a mixture of cement, sand, and other granular pieces.)
Explanation:
Concrete :
Concrete is a mixture which is made up of sand, cement, granular pieces and water. sand can be spread anywhere in liquid form and when it dries it becomes hard as stone. Concrete is used for making buildings.
Composite:
Composite is a material which is formed by mixing various element
Since Concrete is formed on mixing various element like cement, granular pieces, water and sand. Therefore concrete is a material which belong to composite category.
why cant body builders swim please give reasons.
An example of a stable ecosystem is a...
What are the two most important properties of a telescope?
The two key properties of a telescope include its light gathering ability, allowing the viewing of faint and distant objects, and resolving power, which enables detailed viewing of closely spaced objects.
Explanation:The two most important properties of a telescope are its light gathering ability and resolving power. The light gathering ability, determined by the diameter of the lens or mirror, allows the telescope to collect more light which means the telescope can see fainter objects. For example, larger telescopes can see more distant stars and galaxies.
On the other hand, the resolving power, or the ability to distinguish between two closely spaced objects, depends on the quality of the optics and the viewing conditions. This property allows for the detailed viewing of objects. For instance, a telescope with high resolving power can detail the rings of Saturn or the craters of the Moon.
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All the outer planet have rings, but the planet with the most complex
When a tennis ball is dropped onto a tennis court from a height of h the ball rebounds to a height of 3 5 h feet. if the ball is initially dropped from a height of 10 feet, find the total distance traveled by the ball before it finally comes to rest?
The total distance traveled by the ball before it finally comes to rest will be 50 m.
What is the distance?Distance is a numerical representation of the distance between two objects or locations.
The distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.
The first drop makes the ball travel 10 m.
Then the maximum height decreases to 16 x 0.81 = 12.96m
If we make a pattern, this forms a geometric progression in which the common ratio is 0.6 and the first term is 10.
The sum of this series will be;
[tex]\rm \sum d= \frac{a}{1-r} \\\\ \sum d= \frac{10}{1-0.6} \\\\ \sum d= 25 m[/tex]
This is the upward height, and the ball returns every time so:
Total distance = 25 x 2= 50
Hence the total distance traveled by the ball before it finally comes to rest will be 50 m.
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The total distance a tennis ball travels before coming to rest after being dropped from 10 feet and rebounding to 3/5 of its previous height is 25 feet, calculated using the sum of an infinite geometric series.
When a tennis ball is dropped from a height, it bounces back but doesn't reach the original height due to energy loss. For a tennis ball dropped from 10 feet and rebounding to 3/5 of the height, the pattern of the ball's motion forms a geometric sequence with the common ratio being the fraction of the height to which it rebounds. Here, that ratio is 3/5.
The total distance traveled would be sum of all descents and ascents. The first descent is 10 feet, and the first ascent is 3/5 of that, which is 6 feet. The ball would continue to rise and fall, with each height being 3/5 of the one before it.
Using the formula for the sum of an infinite geometric series S = a/(1 - r), where a is the first term and r is the common ratio, the total distance traveled can be calculated. For this problem, a is 10 feet and r is 3/5. Thus, the sum S representing the total distance before coming to rest is:
S = 10 / (1 - 3/5) = 10 / (2/5) = 25 feet.
Therefore, the total distance the ball travels before it comes to rest is 25 feet.