The negative acceleration of the truck is -2 m/s.
Acceleration of the body is the rate of change of speed with respect to time. The acceleration of the body is calculated by dividing the change in speed during a particular interval of time, by the time taken to change the speed.
According to the question, the initial speed of the truck is 40 m/s and it decreases to 20 m/s after 10 seconds. As the speed of the truck is decreasing, its sign is negative.
So given in the question
Initial Speed= u = 40 m/s
Final Speed= v = 20 m/s
Change in velocity = v - u
= 20 - 40
= -20 m/s
Time interval = 10 seconds
Acceleration = Change in Velocity/Time interval
= -20/10
= -2 m/s
So the acceleration of the truck is equal to -2 m/s. The negative sign indicates the speed is decreasing.
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Two carts connected by a 0.25 m spring hit a wall, compressing the spring to 0.1 m. The spring constant k is 100 N m . What is the elastic potential energy stored from the spring's compression?
Given that,
Initial position of the spring, x₁ = 0.25 m
Final position of the spring, x₂ = 0.1 m
The spring constant of the spring, k = 100 N/m
To find,
The elastic potential energy stored from the spring's compression.
Solution,
The work done in moving a spring from on position to another is stored in the form of elastic potential energy. It can be given as follows :
[tex]E=\dfrac{1}{2}k(x_2^2-x_1^2)\\\\=\dfrac{1}{2}\times 100\times (0.1^2-0.25^2)\\\\=2.62\ J[/tex]
So, the required energy is 2.62 J.
Answer:
1.125 J
Explanation:
The correct answer is 1.125 J
the density of aluminum is 2.70 g/cm3. express this value in units of kilogram per cubic meter and pounds per cubic foot.
The density of aluminum in units of kilogram per cubic meter is 2700kg/m³
The density of aluminum in units of pounds per cubic foot is 1.686lb/ft³
unit conversion - conversion of one unit to another unit of measurement of same quantity by using multiplication/division.
the density of aluminum is 2.70 g/cm3.(given)
1 kg = 1000g
1m = 100cm
density of aluminum in kg/m³ is :
2.7×10⁻³kg/10⁻⁶m³
2700kg/m³
density of aluminum in lb/ft³ (ponds per cubic foot) is :
1g = 0.2204lb
1cm = 0.328ft
= 2.7×0.02204/(0.328)³
1.686lb/ft³
The density of aluminum in units of kilogram per cubic meter is 2700kg/m³
The density of aluminum in units of pounds per cubic foot is 1.686lb/ft³
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What happens to a cell in an hypotonic solution?
Answer:
★ In a hypotonic solution, the solute concentration is lower than inside the cell. If the water continues to move into the cell, it can stretch the cell membrane to the point the cell bursts (lyses) and dies.
Explanation:
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A nonconducting ring of radius R is uniformly charged with a total positive charge q. The ring rotates at a constant angular speed \omega about an axis through its center, perpendicular to the plane of the ring. What is the magnitude of the magnetic field on the axis of the ring a distance 1/2 R from its center?
The magnitude of the magnetic field on the axis of the ring (1/2)R from its center is [tex]\frac{\mu_{0} \omega qR^{2}}{2.5(\sqrt{5} )\pi R }[/tex].
The magnetic influence on moving electric currents, electric charges, and magnetic materials is described by a magnetic field, which is a vector field. A force acting on a charge while it travels through a magnetic field is perpendicular to both the charge's motion and the magnetic field.
The radius of the nonconducting ring is R.
The ring is uniformly charged q.
The ring rotates at a speed of ω.
The distance between the ring and its center is x = (1/2)R.
The magnetic field on a current loop's axis is given as follows:
[tex]B = \frac{\mu_{0} IR^{2}}{4 \pi (x^{2}+R^{2})^{\frac{3}{2}} }[/tex]
Now, [tex]I=\frac{q}{2 \pi /\omega}[/tex]
The magnetic field's strength at x = R/2 is:
[tex]B = \frac{\mu_{0} IR^{2}}{4 \pi (x^{2}+R^{2})^{\frac{3}{2}} }[/tex]
[tex]B = \frac{\mu_{0} IR^{2}}{4 \pi ((\frac{R}{2} )^{2}+R^{2})^{\frac{3}{2}} }[/tex]
[tex]B = \frac{\mu_{0} IR^{2}}{4 \pi ((\frac{5}{4} )R^{2})^{\frac{3}{2}} }[/tex]
[tex]B = \frac{\mu_{0} \omega qR^{2}}{2.5(\sqrt{5} )\pi R}[/tex]
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If a car has a mass of 200 kilograms and produces a force of 500 N, how fast will the car accelerate?
Answer:
2.5m/s²
Explanation:
Given parameters:
Mass of car = 200kg
Force on car = 500N
Unknown:
Acceleration of the car = ?
Solution:
According to Newton's second law of motion:
Force = mass x acceleration
Insert the given parameters and find the acceleration;
500 = 200 x acceleration
acceleration = 2.5m/s²
Explanation:
F = ma
500N = 200 × a
200a. = 500N
a. =. 2.5m/s²
PLEASE GIVE BRAINLIEST.
A 1000 kg car moves with a constant speed 20.0 m/s
around a flat circular track of radius 30.0 m. What is the
centripetal acceleration of the car?
Answer:
13.33 m/s^2
Explanation:
Velocity^2 then divide that by the radius
A green laser pointer emits light with a wavelength of 532 nm. What is the frequency of this radiation, in hz?.
The frequency of electromagnetic waves is 5.64 x 10¹⁴ Hz.
We need to know about electromagnetic waves to solve this problem. Electromagnetic waves can propagate without media. The speed of electromagnetic in vacuum media is equal to the speed of light. Hence, the wavelength and frequency can be determined as
c = λ . f
where c is the speed of light (3 x 10⁸ m/s), λ is wavelength and f is frequency.
From the question above, we know that
λ = 532 x 10¯⁹ m
By substituting the given parameter, we can calculate the frequency of green laser pointer
c = λ . f
f = c / λ
f = 3 x 10⁸ / 532x10¯⁹
f = 5.64 x 10¹⁴ Hz
Hence, the frequency is 5.64 x 10¹⁴ Hz.
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Question 6 (3 points)
(03.01 MC)
The fossils found in the different layers of Earth are listed below.
Top layer: Fossil A
Bottom layer: Fossil B
Second layer from top: Fossil C
Third layer from top: Fossil D
Which fossil is the oldest? (3 points)
Oa
Fossil A
Fossil B
Fossil C
Fos
d
Answer:
fossil c
Explanation:
estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1- km/h speed, has a 0.5- m width, and a field is 360 ft long and 160 ft wide. 1 m
The calculated time taken is 10.7 hours
Given that our speed is 1 km/h and our width is 0.5 m, we can mow a path that is 0.5 m wide and 1000 m long in an hour, covering a total area of 1000 m * 0.5 m = 500 m2/hr.
Let's now determine the size of that football field.
5350.692864 m2 is equal to 360 ft / 3.281 ft/m plus 160 ft / 3.281 ft/m.
To determine how many hours it will take, divide that area by the 500 m2 that was previously determined.
500 m2/hour / 5350.692864 m2
= 10.70138573 hr
In other words, moving the football field would take around 10.7 hours.
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calculate the displacement and velocity of a ball 0.50 seconds after it is thrown straight up with an initial velocity of 15.0 m/s. take the point of release to be an initial height of zero.
Answer:
The ball will have a displacement of 0.5*15.0=7.5m after 0.5 seconds. The velocity of the ball will be 15.0 m/s, since it is not acted on by any forces except gravity (which acts in the direction opposite of the velocity).
Explanation:
We know this is the answer because, according to the kinematic equation:
v^2=u^2+2*a*d
0=15.0^2+2*(-9.8)*d
d=-7.5m
what are two conditions of equilibrium? write them in word
Which forms of heat transfer require matter(particles) to happen? (Select all that apply)
Conduction
Convection
Radiation
None of these
Answer.
Conduction
Convection
explanation.
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat. If there is a temperature difference between two systems heat will always find a way to transfer from the higher to lower system.
A sound wave has a velocity of 350 meters/second and a frequency of 430 hertz. what is its wavelength? a. 0.01 meters b. 0.60 meters c. 0.81 meters d. 0.08 meters
The wavelength of a sound wave with a velocity of 350 meters/second and a frequency of 430 Hz is 0.81 meters.
The relation between velocity(v), frequency(f) and wavelength(lambda) of a sound wave is given by the following formula,
V = (f)(λ) equation1
We are given that , v = 350 meters/second
f = 430 hertz
By putting the above values in the equation1 , we will get
350 = 430 x (λ)
350/430 = λ
λ = 0.81 meters
Thus, the wavelength of a sound wave with a velocity of 350 meters/second and a frequency of 430 Hz is 0.81 meters.
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What is a physical change ?
A. Burning wood
B. Rusting metal
C. Cooking a egg
D. Freezing water
Answer : Freezing water !
An object of known mass that can be used to establish uncertainty in measurements made with a balance is best described as a.
According to the graphic, the weighing balance has a hundredth-place level of uncertainty.
What is a balance?The characteristic of matter that gauges its resistance to acceleration in physics. An object's mass can be thought of as a rough count of its atoms.
Any tool that measures an object's mass or weight is referred to as a balance. Every laboratory needs balance as an essential tool.
In the hundredth position, there is uncertainty. There are always three significant figures for a mass that is between 1 gram and 9 grams when it is measured on this balance.
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A bicyclist pedaling up a hill is this a form of kinetic energy or potential energy?
Answer:
Kinetic
Explanation:
Its a moving action
When a bicyclist is pedaling up a hill, it is a form of potential energy. The correct option is option potential energy.
An object's position or configuration in relation to other things might provide it potential energy. The potential energy in this situation is gravitational potential energy.
Because they are being lifted against gravity as they ascend the hill, the cyclist gains gravitational potential energy. The potential energy of the cyclist increases as they ascend.
The potential energy will be transformed into kinetic energy once the cyclist begins pedaling or moving downward.
As a result of their increased height above the ground, cyclists are building up potential energy as they bike up a hill. They gain speed as they cycle downhill, transforming that potential energy into kinetic energy.
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How do sound waves travel?
Sound waves radiate outward from a central point.
Sound moves randomly in different directions.
Sound causes the air near it to vibrate inwards.
Sound transforms waves into different frequencies.
please give right answer!
Answer:
Sound waves move by vibrating objects and these objects vibrate other surrounding objects, carrying the sound along. The further away from the original source of a sound you are, the waves lessen until they don't have the strength to vibrate any other particles.
Explanation:
Which of the following actions is an example of an improvement in human capital?
A
Michelle applies for a job as a mechanical engineer at Honeywell.
B.
Marcus hires three workers for his thriving electrical business.
C.
Hawk Builders of Phoenix builds two new hospitals.
D.
Frank's Furniture trains all of its employees to use computers.
Answer: D
Explanation:
Frank’s Furniture trains all of its employees to use computers is an example of an improvement in human capital.
broglie wavelength of a 231 gg baseball with a speed of 34.0 m/sm/s ? express your answer in meters.
The broglie wavelength is 9.27 x 10¯³⁵ meter.
We need to know about de Broglie's wavelength to solve this problem. Broglie's wave equation is the following :
λ = h / (m.v)
where λ is the wavelength, h is Max Planck constant 6.62x10⁻³⁴ J.s, m is the mass and v is velocity.
From the question above, we know that:
m = 231 gram = 0.231 kg
v = 34 m/s
By substituting the parameter, we get :
λ = h / (m.v)
λ = 6.62x10⁻³⁴ / (0.21 x 34)
λ = 9.27 x 10¯³⁵ m
Hence, the broglie wavelength is 9.27 x 10¯³⁵ meter.
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a ball is thrown upward at 25 m/s from the ground. what is the average velocity and average speed of the ball after 5 seconds?
Will mark brainliest
Answer:
v = u +at
Explanation:
The equation that relates the final velocity and the average acceleration is written as follows :
v = u +at
Where
v is final velocity
u is initial velocity
a is acceleration
t is time
This equation is valid when the motion is with constant acceleration.
A body is under the action of two forces 7 newton and 10 newton. Find the resultant of the two forces if the forces are parallel and act in the same direction
The resultant of the two forces is is 17 N.
We need to know about force resultant to solve this problem. The force resultant is the total net force applied to the object according to the direction. It can be written as
R = F1 + F2 + ... + Fn
where R is force resultant (net force)
From the question above, we know that
F1 = 7 N
F2 = 10 N
Because the direction is the same, the force will add to each other.
R = F1 + F2
R = 7 + 10
R = 17 N
Hence, the net force is 17 N
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which statement correctly line graph
a. the x-axis is on the left side of the graph
b. the responding variable is on the y-axis
c. the line graph has 3 axes
d. the manipulated variable is not shown
Answer:
A.
Explanation:
The X-Axis is always on the left side.
You are designing a new home for a cold climate. You want one room in the
house to be warmed by the Sun's energy. Which material would be best to use
for absorbing energy from electromagnetic waves that have entered the
room?
A. A mirror
B. Clear glass
C. A shiny metal
D. Dark fabric
Answer:
D. Dark fabric
Explanation:
A dark fabric would be the best and most desired material for designing the new home to absorbed energy from the sun.
A black body is a good absorber of thermal radiation or heat energy from the sun. It is a perfect absorber and does not allow the energy to seep out. A shiny metal is a good reflector. It does not absorb thermal energy and therefore, it is not a good material to design the house.Dark fabric is the material would be best for absorbing energy from electromagnetic waves.
What is Energy?This is defined as the ability or capacity to do work and is present in sources such as electromagnetic waves.
Dark surfaces absorb energy while lighter surfaces don't which is why option D was chosen as the most appropriate choice.
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Ou
A truck starts from rest and accelerates uniformly over a time of 5.5 seconds for a
distance of 130 m. Determine the acceleration (in m/s^2) of the truck.
Please submit your answer with 2 decimal places!
Answer:
8.6m/s²
Explanation:
Given parameters:
Initial velocity = 0m/s
Time = 5.5s
Distance = 130m
Unknown:
Acceleration = ?
Solution:
To solve this problem, we use one of the appropriate motion equations:
S = Ut + [tex]\frac{1}{2}[/tex] at²
S is the distance
U is the initial velocity
t is the time taken
a is the unknown acceleration
t is time taken
Since U = 0m/s
S = [tex]\frac{1}{2}[/tex] at²
130 = [tex]\frac{1}{2}[/tex] x a x 5.5²
130 = 15.13a
a = 8.6m/s²
You are playing catch in the front yard and your sister throws a football at you, then your neighbor throws a baseball at
you at the same speed.
Which ball has the greater momentum?
100 POINTS PHYSICS PLEASE HELP
1: Let’s say you drop a 100 kg ball from the top of the stairs and by the
time it reaches the ground it has a velocity of 40 m/s. How much kinetic
energy would it have?
2: If a 63.5 kg person climbs a hill that is 1500 m and stands at the top
looking over the edge, what is their potential energy at that point?
3: If that 63.5 kg person went parachuting, jumped out of an airplane, and
reached a velocity of 80 m/s before opening their parachute, how much
kinetic energy would they have?
4: Look at the formula for potential energy. Why would that 63.5 kg person
have more energy if they walked up a 1500 m hill than if they walked 1500
m on a flat surface?
Answer:
1: The Ball Has 80,000 J
2: Their Potential Energy Is 934,083 J At That Point
3: They Would Have 203,200 Kinetic Energy
4: The Person Would Have More Potential Energy GoingUp A 1500 M Hill Rather Than Walking 1500 M On A Flat Surface Because When You Walk Up Something You Have More Potential Energy Then When You Walk On Flat Ground
Reason:
1: 100kg x 40 m/s = 80,000
2: 63.5 x 1500 M = 934,083
3: 63.5 x 80 M/s = 203,200
What is the answer please help me!
Answer:
The greatest force of gravity on the ball will occur at the point when the ball is near to hit the ground
Explanation:
We know that the earth's center attracts everything towards its center with an acceleration of 9.8 m/s² so it simply means that the change in velocity must occur to produce acceleration. When the ball comes towards the earth, its speed continuously increases and it is at maximum level when it is about to hit the ground so this is the point where gravitational force is maximum.
I hope this helps ^_^
Help! How do you find the Eccentricity??
Explanation:
The formula to determine the eccentricity of an ellipse is the distance between foci divided by the length of the major axis
What unite do scientists use to measure force
A) Newton
B) grams
C) meters
D) meters per second per second