The best estimate of the magnitude of the box's acceleration is 0.35 m/s².
option D is the correct answer (last option)
What is the magnitude of the acceleration of the box?
The magnitude of the acceleration of the box is calculated by applying Newton's second law of motion as follows;
Mathematically, the formula for Newton's second law of motion is given as;
F (net) = ma
F - Ff = ma
where;
F is the applied force on the boxFf is the force of friction experienced by the boxm is the mass of the boxa is the acceleration of the boxF - μmg = ma
where;
μ is the coefficient of static frictionThe acceleration of the box is calculated as follows;
F - μmg = ma
25 - (0.4 x 7 x 9.81) = 7a
-2.5= 7a
a = -2.5 / 7
a = -0.36 m/s² ≈ -0.37 m/s²
Thus, the acceleration of the box is a function of the applied force and force of friction.
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Can you make predictions about the Moon's appearance?
Answer:
answer: no
Explanation:
Timed plz hurry
Therapeutic boarding schools help parents cope with their teens who have borderline personality disorder in all of the
following ways except
A. teaching the parents how to positively support their teen while they are at home
B. providing family therapy while the teen is in treatment
c. teaching the parents to persistently support the teen's unstable self-image
D. teaching the patient how to interact appropriately with their peers
C. Teaching the parents tp persistetly support the teen's unstable self-image
Explanation:
Therapeutic boarding schools doesn't help parents cope with their teens by: c. teaching the parents to persistently support the teen's unstable self-image.
The types of personality disorder.In Psychology, there are different types of personality disorder and these include the following:
Narcissistic personality disorder.Obsessive-compulsive personality disorder.Antisocial personality disorder.Avoidant personality disorder.Borderline personality disorder.Basically, a therapeutic boarding school is an institution that is established to help parents positively cope with offspring who have borderline personality disorder.
However, therapeutic boarding schools doesn't teach parents to persistently support any teen's unstable self-image.
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A package is dropped from a flying plane. The package, which had a zero initial vertical velocity, falls with an open
parachute at a constant acceleration of 3.6 m/s?
How long, in seconds, will it take for the package to fall a vertical distance of 45 m?
Answer:
5s
Explanation:
s = ut + (1/2)at^2
45 = 1/2 x 3.6 x t^2
t = 5s
Light falls on two slits 0.0000716 m apart and produces an interference pattern in which
the fourth-order fringe is 0.038 m from the central fringe on a screen 1.0 m away.
A) What is the wavelength of the light?
B) Roughly what color is the light?
Answer:
λ = 6.802 10⁻⁷ m, wavelength corresponds to orange almost red
Explanation:
The expression for constructive interference is
d sin θ = m λ
let's use trigonometry
tan θ = y / L
tan θ = sin θ / cos θ
interference experiments angles are very small
tan θ = sin θ = y / L
substituting
[tex]d \ \frac{y}{L}[/tex] = m λ
in this case they indicate the separation of the slits d = 7.16 10-5 m, the order of the interference is m = 4, the distance y = 3.8 10-2 m and the separation to the screen L = 1 m
A) they ask us for the wavelength
λ = [tex]\frac{d y}{ m L}[/tex]
let's calculate
λ = 7.16 10⁻⁵ 3.8 10⁻² /(4 1)
λ = 6.802 10⁻⁷ m
B) Let's reduce the wavelength to nm
λ = 6.802 10⁻⁷ m (109 nm / 1m)
λ = 680.2 nm
this wavelength corresponds to orange almost red
1. Calculate the molecule fraction at 650K and 800K when
the activation energy, Ea,
(a) 15 kJ mol
(b) 150 kJ mol
(c) 300 kJ mol
Answer:
I think it's B, I may not be right so take this with a grain of salt
Explanation:
a force of 500 Newton is used to stretch a spring with a 0.5 kg mass attached to it by 0.35 cm what is the value of the spring constant and frequency of the oscillator
Answer:
F. 20 cm m. The stretching force is the weight. (W = mg) of the 4 -kg mass: F = (4 kg)(9.8 m/s2) = 39.2 N.
Either the oscillating mass or the spring constant can be modified to alter the oscillator's natural resonant frequency.
What spring constant and frequency of the oscillator?Consider a spring with an unstretched length l, a spring constant of k, and a mass M hanging from it. The oscillation frequency would be k/M if the spring's mass were ignored. According to the rule that was cited, the effect of the spring mass would be to change M in the equation for to M + m/3.
The oscillating system's frequency would rise if the spring was firmer. The resonance frequency of the system would be lowered by adding mass to it.The spring mass would have the effect of changing M in the equation for to M + m/3 in accordance with the cited rule.
Therefore, F. 20 cm m. The weight (W = mg) of the 4 kg mass is the stretching force: F = (4 kg)(9.8 m/s2) = 39.2 N.
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You are at the edge of a diving board that is 9 meters above the water. If you weigh 500 Newtons, what is your potential energy?
Answer:
4500 J
Explanation:
First, let's define some equations and derivations.
Our potential energy formula is:
[tex]\displaystyle U = mgh[/tex]Where m is mass (in kg), g is the gravitational constant (in m/s²), and h is height (in m).
We also know that mg is equal to the weight of an object (in N), from Newton's 2nd Law of Motion: F = ma (Force is equal to [constant] mass times acceleration).
Therefore, we can simply substitute force into the equation:
[tex]\displaystyle U = Fh[/tex]Where F is the force (in N) and h is still height (in m).
Now we can calculate the amount of potential energy in our system, measured in joules.
Substitute in the given variables, F = 500 N and h = 9 m:
[tex]\displaystyle U = (500 \ N)(9 \ m)[/tex]Using simple Pre-Algebra rules, we find that:
[tex]\displaystyle U = 4500 \ J[/tex]This tells us that the we have 4500 joules of potential energy when I am 9 meters above the water on the edge of the diving board.
Answer:
4500 J
Explanation:
First, let's define some equations and derivations.
Our potential energy formula is:
Where m is mass (in kg), g is the gravitational constant (in m/s²), and h is height (in m).
We also know that mg is equal to the weight of an object (in N), from Newton's 2nd Law of Motion: F = ma (Force is equal to [constant] mass times acceleration).
Therefore, we can simply substitute force into the equation:
Where F is the force (in N) and h is still height (in m).
Now we can calculate the amount of potential energy in our system, measured in joules.
Substitute in the given variables, F = 500 N and h = 9 m:
Using simple Pre-Algebra rules, we find that:
This tells us that the we have 4500 joules of potential energy when I am 9 meters above the water on the edge of the diving board.
The temperature of an object is -153°C. Its temperature is raiselt to 273°C. What is the
temperature change of the object?
426
699
153
120
Answer:
426
Explanation:
I think the answer is 426 or 120 but we. can get 120 when we add
what disadvantage of convex mirror
☁️ Answer ☁️
The main disadvantage of convex mirrors is that they show a distorted picture of what is behind you. Distances are seen not as they are in reality and things appear closer than they really are. They are showing cars approximately twice as far away as they actually are.
Hope it helps.
Have a nice day hyung!~ ￣▽￣❤️
Answer:
disadvantage is that convex mirror is that they make it appear like those objects are at a more noteworthy distance than they actually are. It always gives a virtual, erect and a diminished image.
why an inclined is considered as simple machine
The efficiency of Carnot engine working between steam point and ice point is?
Answer: 26.8%
Explanation: the ice point is 273k and the steam point is 373k and the efficiency of the carnot engine is given as: 1 --- T2/T1 = 1 --- 273/373 = 1 --- 0.731 = 0.268 = 26.8%
*check out "toppr" for more help if needed!*
the surface of a mirror is flat.
Answer:
plane on edge
Explanation:
15. A conductor has a surface charge density of 300nC/m^2. If the area of the conductor is
15m^2 what is the electric flux through the given area of the conductor (60= 8.85 x 10^-12C^2Nm?).
(a) 5.08 x10Nm²/C
(b) 2.08 x 10Nm2/C
(c) 1.08 x10
Nm²/C
(d) 0.08 x 10Nm2/C
E = sigma/2 * epselon naught
E = 300 * 10^-9/(2 * 8.854 * 10^-12)
E = 1.7 * 10^4 N/C
Assuming that the electric field is uniform all across the surface:
Then, Electric flux = E * A
Electrix flux = 1.7 * 10^4 * 15 = 2.5 x 10^5 Nm^2/C
It should be b)
The electric flux through the given area of the conductor is
2.26 x 10³ Nm²/C.
Surface charge density of the conductor, σ = 300 x 10⁻⁹ C/m²
Area of the conductor, A = 15 m²
The equation for surface charge density is,
σ = q/A where q is the charge in the conductor.
So,
Charge, q = σ A
q = 300 x 10⁻⁹/15
q = 2 x 10⁻⁸C
Therefore,
Electric flux through the conductor, Φ = q/ε₀
Φ = 2 x 10⁻⁸/8.85 x 10⁻¹²
Φ = 2.26 x 10³ Nm²/C
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One mole of iron (6 x 10^23 atoms) has a mass of 56 grams, and its density is 7.87 grams per cubic centimeter, so the center-to-center distance between atoms is 2.28 x 10^-10 m. You have a long thin bar of iron, 2.3 m long, with a square cross section, 0.12 cm on a side. You hang the rod vertically and attach a 149 kg mass to the bottom, and you observe that the bar becomes 1.17 cm longer. From these measurements, it is possible to determine the stiffness of one interatomic bond in iron.
ks = 20014.1 N/m
Number of side-by-side long chains of atoms = 4.81e^12
Number of bonds in total length = 1.096e^10
What is the stiffness of a single interatomic "spring"?
Answer:
Explanation:
Given that:
length l = 2.3 m
a = 0.12 cm = [tex]0.12 \times 10^{-2} \ m[/tex]
[tex]x = 1.17 \ cm = 1.17 \times 10^{-2}\ m[/tex]
m = 149 kg
[tex]\delta = 7.87 \ g/cm^3[/tex]
[tex]da = 2.28 \times 10^{-10}\ m[/tex]
[tex]F_{net} = F-mg\\ \\0 = F - mg \\ \\ F = mg \\ \\ k_sx = mg \\ \\[/tex]
∴
[tex]k_s = \dfrac{149(9.8)}{1.17 \times 10^{-2}} \\ \\ k_s = 124803.42 \ N /m[/tex]
[tex]N_{chain} = \dfrac{A_{wire}}{A_{atom}} = \dfrac{A_w}{da^2}[/tex]
[tex]N_{chain} = \dfrac{(a)^2}{(da)^2} = (\dfrac{a}{da})^2[/tex]
[tex]N_{chain} = (\dfrac{0.12 \times 10^{-2} }{2.28 \times 10^{-10}})^2[/tex]
[tex]N_{chain} = 2.77 \times 10^{13}[/tex]
[tex]N_{bond} = \dfrac{L}{da} \\ \\ = \dfrac{2.3}{2.28 \times 10^{-10}} \\ \\ N_{bond} = 1.009 \times 10^{10}[/tex]
[tex]\text{Finally; the stiffness of a single interatomic spring is:}[/tex]
[tex]k_{si} =\dfrac{N_{bond}}{N_{chain}}\times k_s[/tex]
[tex]k_{si} =\dfrac{(1.009 \times 10^{10})}{2.77*10^{13}}}\times (124803.42)[/tex]
[tex]\mathbf{k_{si} =45.46 \ N/m}[/tex]
Do electric field line form closed loop???
Answer:
no electric field line don't song closed loop.
Which of the following phenomena provides evidence for the particle theory of light?
Refraction of light through a prism
Interference patterns produced from light through a double slit
Polarization of light in sunglasses
Ejection of electrons from metals illuminated with different frequencies of light
Answer:
The ejection of electrons from metals illuminated with different frequencies of light (photoelectric effect)
Explanation:
Ejection of electrons from metals illuminated with different frequencies of light provides evidence for the particle theory of light
What is photoelectric effect ?
The photoelectric effect proves that light has particle-like activity. The photoelectric effect happens when photons are shone on metal and electrons are ejected from the surface of that metal. The electrons that are ejected are determined by the wavelength of light which determines the energy of photons.
correct answer is
Ejection of electrons from metals illuminated with different frequencies of light
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What do you mean by infracture of business?
Answer: Infrastructure is the general term for the basic physical systems of a business, region, or nation. and it involves the production of public goods
Explanation:
Which of the following statements is true? Thunderstorms are not dangerous The eye of a hurricane is the most danger Tornadoes form when wind change all of the above
honestly they all seem wrong to me but it's not giving me another option hurry if possible
Answer:
False
Explanation:
includess lighting and powerful winds over 50Mph,creates hail and causes flash flooding and also tornadoes
THE FIRST TO ANSWER WILL GET BRAINLIEST!!!! Compare and contrast the three main layers of the earth.
Answer:
The first layer is the crust a very thin layer compared to any other
the second layer is the mantal there is 2 parts to the matal there is a solid mental and a hard mental
the last part is the core the most dense part of earth
Explanation:
An object of mass m1= 5kg placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging object of mass m2= 8kg as shown in figure.
Calculate,
(a) the acceleration (a) of the objects
(b) the tension (T) in the string.
(a) The acceleration of the objects (in m/s2) is
Answer for part 1
(b) The tension in the string (in Newtons) is
Answer for part 2
Answer:
a. 6.04 m/s^2 (3 sig. fig.) b. T = 30.2 N
Explanation:
a) Assume that the acceleration due to gravity is 9.81 m/s^2 downwards
8x9.81 = (5+8)a
a = 6.04 m/s^2 (3 sig. fig.)
b) Using the results from (a)
T = 5(6.04)
T = 30.2 N
PSYW - Please Show Your Work
A radiator made out of iron of specific heat capacity 450 J/kgk has a mass of 45.0 kg
and is filled with 23.0 kg of water of specific heat capacity 4200 J/kgK.
Determine the energy required to raise the temperature of the radiator-water system by
1°K
Answer:
9.66E4 J
Explanation:
We have that the energy required to raise the temperature of the radiator-water system by
1°K
E=116.85KJ
From the question we are told
A radiator made out of iron of specific heat capacity 450 J/kgk has a mass of 45.0 kg and is filled with 23.0 kg of water of specific heat capacity 4200 J/kgK.
Determine the energy required to raise the temperature of the radiator-water system by 1°K
Generally the equation for the Energy is mathematically given as
[tex]E=((mc)_i+mc_w)dt\\\\Therefore\\\\E=(45* 450 +4200*23)1\\\\E=116850J\\\\E=116.85KJ\\\\[/tex]
Therefore
the energy required to raise the temperature of the radiator-water system by
1°K
E=116.85KJ
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to what height will a 250g soccer ball rise to if it is kicked directly upwards at 8 meters per second
Answer:
h = 3.26 m
Explanation:
Given that,
Mass of the soccerball, m = 250 g
Speed of the ball, v = 8 m/s
We need to find the height upto which the soccerball is raised. Let the height be h. Using the conservation of energy i.e.
[tex]mgh=\dfrac{1}{2}mv^2\\\\h=\dfrac{v^2}{2g}\\\\h=\dfrac{8^2}{2\times 9.8}\\\\h=3.26\ m[/tex]
So, it will raised up to a height of 3.26 m.
what instrument will be used to measure the volume of a box
Answer:
A ruler.
Explanation:
Just measure height, length and width and multiply each.
4. You are walking at a leisurely pace of .75 m/s when you hear the train coming and start running to catch it. Over the next 10 seconds, you speed up to 3.5 m/s and catch your train! What was your acceleration over that time?
Answer:
0.275 m/s²
Explanation:
The acceleration of an object is defined as the change in velocity over the change in time.
a = Δv/Δt a = (v - v₀)/tWe are given the initial velocity, 0.75 m/s. The final velocity of the user in question is 3.5 m/s.
The time it takes for us to catch the train is 10 seconds. Using these variables, let's substitute into our equation.
a = (3.5 - 0.75)/10 a = 2.75/10 a = 0.275 m/s²Our acceleration over that time was 0.275 m/s² in order to catch the train.
6) If a mass of an object is decreased to half and acting force is reduced by quarter the acceleration of its motion
b) Increases to its doute
d) Remains constant
a) Remains constant,
c) Increases to its four times
Answer:
Decreases to half.
Explanation:
From the question given above, the following data were obtained:
Initial mass (m₁) = m
Initial force (F₁) = F
Initial acceleration (a₁) =?
Final mass (m₂) = ½m
Final force (F₂) = ¼F
Final acceleration (a₂) =?
Next, we shall determine a₁. This can be obtained as follow:
F₁ = m₁a₁
F = ma₁
Divide both side by m
a₁ = F / m
Next, we shall determine a₂.
F₂ = m₂a₂
¼F = ½ma₂
2F = 4ma₂
Divide both side by 4m
a₂ = 2F / 4m
a₂ = F / 2m
Finally, we shall determine the ratio of a₂ to a₁. This can be obtained as follow:
a₁ = F / m
a₂ = F / 2m
a₂ : a₁ = a₂ / a₁
a₂ / a₁ = F/2m ÷ F/m
a₂ / a₁ = F/2m × m/F
a₂ / a₁ = ½
Cross multiply
a₂ = ½a₁
From the illustrations made above, the acceleration of the car will decrease to half the original acceleration
The description of the structure of the atom is called the??
I think for this it is atomic model
What is 3^7*8^3*5^6?
Answer:
17496000000
Explanation:
Equal masses of water at 80°C and paraffin at 20°C are mixed in a container. The specific
heat capacity of water is twice that of paraffin. What is the final temperature of the
mixture?
O 60°C
O 50°C
O 40°C
O 30°C
Which of the following features make Earth and Venus similar to each other?
Answer:
A. size and mass
Explanation:
3. Our favorite nature explorer Steve Irwin is currenty warking with crocodiles in the Nile River. One of the big boy crocs gets hungry and takes off after some prey. Steve and his wife Terri want to know how much kinetic energy the croc exhibits when chasing prey. The croc has a mass of 600 kg and can swim at a velocity of 4 m/s. Calculate the kinetic energy of the croc,
Answer:
K.E = 4800 Joules.
Explanation:
Given the following data;
Mass = 600 kg
Velocity = 4 m/s
To find the kinetic energy;
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where;
K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Substituting into the equation, we have;
[tex] K.E = \frac{1}{2}*600*4^{2}[/tex]
[tex] K.E = 300 * 16 [/tex]
K.E = 4800 Joules.