The minimum value of the coefficient of static friction between the block and the slope is 0.53.
Minimum coefficient of static frictionApply Newton's second law of motion;
F - μFs = 0
μFs = F
where;
μ is coefficient of static frictionFs is frictional forceF is applied forceμ = F/Fs
μ = F/(mgcosθ)
μ = (250)/(50 x 9.8 x cos15)
μ = 0.53
Thus, the minimum value of the coefficient of static friction between the block and the slope is 0.53.
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3.Shanai drove 40 miles to the west, then turned around and drove 70 miles to the east.
Draw vectors that show each segment of her trip and the resultant displacement vector. Find
her resultant displacement.
Answer:
Explanation:
Comment
The main points are that
The arrowheads go in opposite directionsDisplacement is measured from the origin to the arrowhead of the last vector correctly drawn.the tail of the second vector starts where the arrowhead of the first vector is.Solution
40 miles west
<========================== 0
=====================================================>
Displacement (30 km east)
Answer
30 km east
To reach a distance of 2 km, a car has to cover a path of 2.4 km in 10 minutes. Calculate its average speed and velocity
Answer:
Average speed = 0.24 km/min.
Average velocity = 0.2 km/min.
Explanation:
Finding average velocity :
Least possible distance / Time taken2 km / 10 min0.2 km/min.Finding average speed :
Path distance / Time taken2.4 km / 10 min0.24 km/min.Two people start at the same place and walk around a circular lake in opposite directions. one has an angular speed of 1.11 x 10-3 rad/s, while the other has an angular speed of 8.40 x 10-3 rad/s. how long will it be before they meet
The time taken before the two people will meet is 11 minutes.
Time taken before they meetThe time taken before the two people will meet is calculated from the principle of relative velocity.
(ω₁ + ω₂)t = θ
where:
ω₁ is angular speed of the first personω₂ is the angular speed of the second persont is time of motionθ is angular displacement(1.11 x 10⁻³ + 8.4 x 10⁻³)t = 2π
(9.51 x 10⁻³)t = 2π
t = 2π/9.51 x 10⁻³
t = 660.7 secs
t = 11 mins
Thus, the time taken before the two people will meet is 11 minutes.
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A 0.2 kg ball is attached to a string and whirled around in a circle overhead. The string breaks if the force on it exceeds 80 N. What is the maximum speed the ball can have when the radius of the circle is 1m?
Answer:
added in picture
Explanation:
added in the picture
When does astrons form?
Answer:
don't exist
Explanation:
A ball dropped onto a trampoline returns to the same height after the rebound.
a) Describe the energy change of the ball from the point of release to the top of the rebound
b) What can you say about the energy of the ball at the point of release compared with at the top of the rebound?
a)The ball's potential energy changes as it moves from the release point to the top of the rebound.
b)The ball's potential energy is at its highest and rests when it is in the top position.
What is potential energy?The potential energy is due to the virtue of the position and the height. The unit for the potential energy is the joule.
The potential energy is mainly dependent upon the height of the object.
Potential energy = mgh
The kinetic energy of the body is due to the virtue of motion.
According to the Law of Conservation of Energy, energy can neither be created nor destroyed but can be transferred from one form to another.
The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.
A ball dropped onto a trampoline returns to the same height after the rebound.
Hence, the ball's potential energy changes as it moves from the release point to the top of the rebound. When the ball is at the top position the potential energy is maximum and the ball is at rest.
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does anyone know this whole distance and displacement concept it makes zero sense
Answer:
Distance is the total length travelled, or in other words, it is a measure of how far apart two objects are.
Displacement, on the other hand, the difference between the starting and and ending positions of an object.
For example, if a person walks 10m forwards, then 7m backwards, thereby ending up where he started, he will have travelled a distance of
10 + 7 = 17m .
But the difference between his starting and finishing positions is
10 - 7 = 3m.
If, however, the man walked 10m forwards and then 10m backwards, the distance he covered would be 10 + 10 = 20m, but the displacement would've been 0 as there would be no difference between his starting and ending positions.
Let me know if you still don't understand.
An object has a mass of 8.0 kilograms. a 2.0-newton force moves the object a distance of 3.0 meters to the east, and then 4.0 meters to the north. what is the total work done on the object
Answer:
1. An object has a mass of 8.0 kilograms. A 2.-newton force displaces the object a distance of 3.0 meters to the east, and then 4.0 meters to the north. What is the total work done on the object? 1)10 J 2) 14 J 3) 28 J 4) 56 J I found the resultant of the two distances, which is 5 m, I used 5 m * 2 N=10 J, but it’s not the answer. 2. A 20-newton block is at rest at the bottom of a frictionless incline, since I can’t show you the diagram, I will describe it. Supposed a right triangle, the vertical height is 3 m, and the base is 4.0 m. Then the hypotenuse is the incline and the block is at the bottom. The question is: How much work must be done against gravity to move the block to the top of the incline? I know that conservative forces are forces for which the work done does not depend on the path taken but only on the initial and final positions. But here I Know I should use 3 m * 20N=60 J. but the thing is it starts from the bottom which is the bottom of the incline, and ends at the top, then it should be the length of the hypotenuse? But if it’s 3 m, then it should have started from left end of the base, not the right end of the base which is the bottom of the incline.
Reference: https://www.physicsforums.com/threads/what-is-the-total-work-done-on-the-object.241750/
What are the characteristics of the image formed by the object?
Answer:
The image is formed by a convex lens with the object at 2F.
Image will be of same size as the objectImage will be real and upside down.Sample Response: The image created by the object is located on 2F behind the lens, real, inverted, and the same size as the actual object.
Explanation: EDGE.
A train is traveling west at a velocity of 25 m/s. Another train is traveling east directly toward the west-bound train at a velocity of 15 m/s. The west-bound train blows its whistle with a frequency of 600 Hz when the two trains are 1000 m apart and then blows its whistle again 10 seconds later. For passengers on the east-bound train, how will the perceived frequency of the first whistle compare with the perceived frequency of the second whistle
(a) The frequency observed by the passenger on the east-bound train when they are 1000 m apart is 675.5 Hz.
(b) After 10 seconds, the frequency observed by the passenger on the east-bound train will be greater than the frequency observed when they are 1000 m apart.
Observed frequency
The frequency observed by the passenger on east-bound train is calculated by applying Doppler shift formula.
[tex]f = f_0(\frac{v \pm v_0}{v\pm v_s} )[/tex]
where;
f is observed frequencyf₀ is original frequency or source frequencyv is speed of soundv₀ is speed of observer (positive when moving towards source)vs is source frequency (negative when moving towards observer)when the two trains are 1000 m apart[tex]f = 600(\frac{343 +15}{343-25} )\\\\f = 675.5 \ Hz[/tex]
The frequency observed by the passenger increases with decrease in distance between the two trains.
Thus, after 10 seconds, the frequency observed by the passenger on the east-bound train will be greater than the frequency observed when they are 1000 m apart.
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In times of reduced visibility or at night, what color all-around light should a non-powered canoe or kayak display?.
In times of reduced visibility or at night white light would display a non-powered canoe or kayak.
Light requirement for canoe or kayak at night:In low visibility, lights are the simplest way to stand out. You'll be noticeable for kilometers in the dead of night. You should give slow-moving vessels a considerably bigger head up to your location in conditions of severe rain or fog.
Canoes, kayaks, and rowboats that are under 23 feet in length are likewise subject to the regulations for small sailboats. You must flash a white light when boating between dusk and dawn or during times of reduced visibility so that other boats can notice you in time to avoid a collision.
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The reason galaxies that are distant from our galaxy move away from our galaxy more rapidly than those that are near is:
The reason galaxies that are distant from our galaxy move away from our galaxy more rapidly is more space expands between us and distant galaxies.
What is a galaxy?A galaxy is a group of millions of stars and their systems that are grouped due to gravitational forces.
According to the Big Bang theory, galaxies are expanding and separate among them.
In conclusion, the reason galaxies that are distant from our galaxy move away from our galaxy more rapidly is more space expands between us and distant galaxies.
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Answer:
the galaxies are moving as the universe keep expanding .
Explanation:
Kory was on the porch when a loud sound caught his attention. Looking up, he saw a red car spinning across the intersection and a white car stopped in the intersection. He knew the typical sequence of events for a car collision involved two vehicles moving at speed. As he tried to make sense of the scene, he filled in missing details that he had not actually observed. This will likely result in:
The information illustrates that this will likely result in schema distortion.
What is schema?It should be noted that schema simply means a mental model of an object that includes knowledge, beliefs, and expectations.
In this case, the information illustrates that this will likely result in schema distortion. This led to the missing details.
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light hits ocean during
Answer:
no way to tell since the ocean surface is moving too violently it's not possible to determine the reflected angle
Suppose a creature from another planet has eyes that are sensitive to infrared radiation. Describe what the alien would see if it looked around your library. In particular, what would appear bright and what would appear dim
The incandescent lamp will glow quite brightly in the eyes of the creature because emits less visible light and more infrared light.
What is infrared light?The infrared light is a part of the electromagnetic spectrum that is emitted by a hot object.
As such, the incandescent lamp will glow quite brightly in the eyes of the creature because emits less visible light and more infrared light. The florescent light which does not produce inferred rays will not be visible at all.
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You pushes a 25kg box with 40 N of force, but the friction on the crate is 15 N. What is the net
force?
Answer:
25 N in the direction of your push
Explanation:
The friction force acts against your pushing force....it reduces the net amount of force you are exerting
Net force = 40 - 15 = 25 N
Can anyone please answer this cq..
A force of 10 newtons acts in a direction 75° above horizontal, moving an object 15 meters from (0, 0) to (15, 0). what is the work done by the force?
Work done by the force is 150 Joules.
Steps involved in the question:
Step one:
Given data
Force F= 10N
the distance is described by the coordinate = (0,0) to (15,0)
hence the distance = 15m in the x-direction.
Step two:
Required is the work done
we know that work done is expressed as
Wd= Force* Distance
Wd= 10*15
Wd= 150 Joules
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Perform the following mathematical operation and report answer to the correct number of significant figures 143.6 divided by 21.2
The answer to the correct number of significant figures is 6.774.
What is quotient?When a number(big) divided smaller number, the answer obtained greater than zero is called a quotient.
Divide 143.6 ÷ 21.2
143.6/21.2 = 1436/212
=6.77358
The quotient is rounded to three significant figures after decimal
143.6 ÷ 21.2 = 6.774
Thus, the answer to the correct number of significant figures is 6.774
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a car with a mass of 2,00 kg travels a distance of 400 m as it moves from one stoplight to the next . as its fastest , the car travels at 18 m/s. what is its kinetic energy at this point?
Answer:
32400 J
Explanation:
K.E.=(1/2)(200)(18^2)
What is the frequency in hertz of the UK
mains electricity supply?
Answer:
HERTZ=HZ
Explanation:
What is nuclear power
Answer:
D. All of the statements describe nuclear powerWhat is NUCLEAR POWER?
➡️ is the use of nuclear reactions to produce electricity.
➡️ it can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions.
Hope it helps
Gyroscopic wander can be divided in to two categories, one is DRIFT, what is the other?
Gyroscopic wander can be divided into two categories and these are:
DriftToppleWhat is gyroscopic wander?Gyroscopic wander can be defined as a movement of the spin axis (axis of rotation) away from a specific fixed direction.
Based on scientific information and records, there are two main types of gyroscopic wander and these include the following:
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Nuclear power stations convert the nuclear energy stored in nuclear fuel into what other store of useful energy?
Answer:
The right answer is "thermal energy" or "thermal" or "heat" or "heat energy" or "electricity" or "electrical energy"
Explanation:
Nuclear fuel is used to heat water, increasing its thermal energy. This hot water is used to turn turbines that generate electrical energy.
Nuclear power stations convert the nuclear energy stored in nuclear fuel into thermal energy.
What is thermal energy?
Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.It has 3 types conduction, convection and radiation.
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ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements. In working this problem, assume the value of "g" to be 9.8 m/s2 with two (2) significant digits unless otherwise stated. Calculate the increase in potential energy of a 60.0-kg man who climbs a ladder 10.0 meters high.
5880
600
58,800
The increase in potential energy of a 60.0-kg man who climbs a ladder 10.0 meters high is 5,880 J.
Increase in the potential energy of the man
The increase in the potential energy of the man is calculated as follows;
P.E = mgh
where;
m is mass of the manh is height attained by the mang is acceleration due to gravityP.E = 60 x 9.8 x 10
P.E = 5,880 J
Thus, the increase in potential energy of a 60.0-kg man who climbs a ladder 10.0 meters high is 5,880 J.
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Create a ray diagram for eyeglasses that contain a diverging lens. Assume you are looking at a 2 cm tall object that is 4 cm from the lens. The focal length is 3 cm.
The ray diagram for the given object consists of 2 cm height of object, 4 cm object distance and 3 cm focal length.
Image formed by a diverging lensDiverging lens is called a concave lens. The working of the lens is dependent on the refraction of the light rays as they pass through the lens.
Image formed by a diverging lens is always virtual, erect and diminished; smaller than the object and is located on the same side of the lens as the object.
The ray diagram for the given object is presented in the image in the diagram.
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A football is kicked with an initial velocity of 10 m/s at an angle of 25 degrees. If it hits the ground 1.5s later, how many meters does it travel?
The distance travelled by the ball, given the data is 7.82 m
Data obtained from the questionInitial velocity (u) = 10 m/sAngle of projection (θ) = 25 degrees Time of flight (T) = 1.5 sAcceleration due to gravity (g) = 9.8 m/s²Range (R) = ?How to determine the rangeThe range (i.e distance) travelled by the ball can be obtained as illustrated below:
R = u²Sine(2θ) / g
R = 10² × Sine (2×25) / 9.8
R = 10² × Sine 50 / 9.8
R = 7.82 m
Thus, the distance travelled by the ball is 7.82 m
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When does a driver have to stop for a school bus
A driver have to stop for a school bus when the red lights are flashing and there is no barrier between his/her vehicle and the bus.
What are traffic rules?Traffic rules are rules that are expected to follow by the road users for the safety of everyone using the road.
For instance, when the red lights are flashing , it simply means to stop, while the green light means that the vehicle can continue to move, and yellow light means to be at alert to move.
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this stationary wave is what we call the first harmonic of the first normal mode of the system. in units of l, the length of the wire, what is λ1, the wavelength of the first harmonic?
First harmonic of a closed pipe is determined as velocity, v, to four times length (4L), F₀ v/4L.
First harmonic of a closed pipe
The first harmonic of a closed pipe is the fundamental frequency of the closed of the closed pipe.
L = λ/4
where;
L is the length of the pipeλ is the wavelength of soundλ = 4L
But, v = F₀λ
v = F₀(4L)
F₀ = v/4L
where;
F₀ is the first harmonicv is speed of soundThus, first harmonic of a closed pipe is determined as velocity, v, to four times length (4L), F₀ v/4L.
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Questions: 1. A table of weight 500N has four legs covering a total area of 0.5m². Calculate the pressure applied by the table on the ground
2. A man with a mass of 50kg, is standing on the ground. His two feet cover an area of 0.01m². calculate the pressure exerted by his two feet
3. An elephant has a weight of 40000N and her feet cover a total area of 0.5m². A woman weighs 600N and area of her heels in contact with the ground is 0.0075m². Who exerts the greatest pressure on the ground?
Answer:
shown below
Explanation:
1) P = F/A
P = 500 / 0.5
P = 1000N/m²
2) W = mg
W = 50 x 9.8
W = 490
P = F/A
P = 490 / 0.01
P = 49000N/m²
3) P = F/A
For E:
P = 40000 / 0.5
P = 80000N/m²
For W:
P = 600 / 0.0075
P = 80000N/m²
They're exerting the same amount of pressure on the ground
