[tex]\\ \rm\Rrightarrow \dfrac{1}{u}+\dfrac{1}{v}=\dfrac{1}{f}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{1}{u}=\dfrac{1}{-10}+\dfrac{1}{38}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{1}{u}=\dfrac{-19+5}{190}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{1}{u}=\dfrac{-14}{190}[/tex]
[tex]\\ \rm\Rrightarrow u=\dfrac{190}{-14}[/tex]
[tex]\\ \rm\Rrightarrow u=13.6cm[/tex]
Real
A mountain climber starts at the base of a mountain, climbs all the way to the peak, and then climbs back down to the base of the mountain. At which point is the climber's gravitational potential energy the greatest?
Marjorie drops an object from a height of h meters, and it hits the ground with a velocity of v m/s, as given by the function v equals the square root of 19.6 h. If the velocity of the object is 68.6 m/s, what was the height of the object before it was dropped? Round your answer to the nearest tenth.
Answer:
240.1 m
Explanation:
Potential energy ( mgh) is fully converted to Kintetic energy ( 1/2 mv^2)
equate them
mgh = 1/2 mv^2 divide by 'm'
gh = 1/2 v^2
9.8 h = 1/2 v^2
19.6 h = v^2 v = sqrt ( 19.6h) (as given)
68.6 = sqrt (19.6 h) solve for h = 240.1 m
The theoretical capacity of a process is the reciprocal of the theoretical flow time of the process. Do you agree? Explain.
I do not agree with the statement 'theoretical capacity of a process is the reciprocal of the theoretical flow time of the process' because time is only one variable.
What is theoretical capacity?The theoretical capacity of a process can be defined as the ability to perform a given work in a given period of time.
The theoretical capacity of a process is not only dependent on the time that takes to carry out but also on other variables (e.g., temperature, light conditions, etc).
In conclusion, I do not agree with the statement 'theoretical capacity of a process is the reciprocal of the theoretical flow time of the process' because time is only one variable.
Learn more about theoretical capacity here:
https://brainly.com/question/15520601
#SPJ4
If a proton and an electron are released when they are 2.0 * 10-10 m apart (a typical atomic distance), find the initial acceleration of each particle.
The initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.
What is electrostatic force?The electrostatic force F between two charged objects placed distance apart is directly proportional to the product of the magnitude of charges and inversely proportional to the square of the distance between them.
F = kq₁q₂/r²
where k = 9 x 10⁹ N.m²/C²
Given is the charge on proton and electron is q =1.6 x 10⁻¹⁹ C, distance r =2 x 10⁻¹⁰m , then the force will be
F = k q²/r²
Substituting the above values in the formula, we get the electrostatic force,
F = (9 x 10⁹) (1.6 x 10⁻¹⁹)²/(2 x 10⁻¹⁰)²
F = 5.76 x 10⁻⁹ N
The acceleration of electron when both proton and electron released is
acceleration = electrostatic force / mass of electron
Putting the values, we have initial acceleration of electron
a = (5.76 x 10⁻⁹)/(9.1 x 10⁻³¹)
a = 6.33 x 10²¹ m/s²
The acceleration of proton is due to the electrostatic force of attraction between proton and electron is given by
acceleration = electrostatic force / mass of proton
inserting the values, we get the initial acceleration
a '= (5.76 x 10⁻⁹)/( 1.67 x 10⁻²⁷)
a'= 3.45 x 10¹⁸ m/s²
Thus, initial acceleration of proton and electron is 3.45 x 10¹⁸ m/s² and 6.33 x 10²¹ respectively.
Learn more about electrostatic force.
brainly.com/question/9774180
#SPJ1
Find the force of a 240 kg vehicle accelerating at a rate of 4.5 m/s/s when it hits the wall.
Answer:
1080 Newtons
Explanation:
F = m * a
F = 240kg * 4.5 m/s
F = 1080
What is the difference between
longitudinal waves that have
different amplitudes?
Answer:
Wave amplitude of a transverse wave is the difference of height between a crest and the resting position. Wave amplitude of a longitudinal wave is the distance between particles of the medium where it is currently compressed by the wave.
Answer:
A wave caused by a disturbance with more energy has greater amplitude
Explanation:
How does the ratio of tin to copper affect the properties of the alloy bronze?
Answer:
Stronger and harder than either of the pure metals
Explanation:
A ball falls down from the top of a height of 70m.
How much time the ball will take to reach the ground?
Apply second equation of kinematics
h=1/2gt²gt²=2h9.8t²=2(70)t²=140/9.8t²=14.3t=3.78sThe speed of sound in water is 1,492 m/s. A sonar signal is sent straight down from a ship at a point just below the water's surface and 7.5 s later the reflected signal is detected. How deep is the ocean beneath the ship?
Answer:
5595 m
Explanation:
The wave travels down (the depth) and the back up (the depth again)
this distance is 2 d
2 d = 1492 m/s * 7.5 s
2d = 11190 m
d = 5595 m
A 1.1-m tall child is standing 6.0 m from a spherical convex mirror. The child’s image is 0.40 m behind the mirror. What is the image height and focal length of the mirror?
Answer:
1 / i + 1 / o = 1 / f thin lens equation
(i + o) / o i = 1 / f
f = o i / (i + o) = 6 * -.4 / (-.4 + 6) = -2.4 / 5.6 = -.42 m
The focal length is -.42 m indicating a convex mirror
M = -I / O = -.4 / 6 = -.067 negative magnification indicates erect image
O = M * 1.1 = -.067 * 1.1 = -.073 m height of image
One must be careful with signs because they can vary with textbooks
How long will it take a runner, starting from rest and accelerating uniformly at 1.5 m/s2, to travel 3.0 m
12. What are the components of the vector with a magnitude of 65.0 and a direction of 101.7°?
O (13.2, -63.6)
O (63.6, -13.2)
O (-63.6, 13.2)
O (-13.2, 63.6)
Answer:
V = 65 at 101.7 deg
Vx = V cos θ = 65 cos 101.7 = -13.2
Vy = V sin θ = 65 sin 101.7 = 63.6
The last option is correct
Static electricity is a ____ charge.
missing
temporary
flowing
permanent
Answer:
static electricity is a flowing charges
how can we change the frequency of the wave
Answer:
.Also we can change the frequency by decreasing wavelength , or increasing velocity
Explanation:
which direction should a ceiling fan turn in the summer
What is the acceleration along the ground of a 10 kg wagon when it is pulled with a force of 44 n at an angle of 35° above the horizontal? 0.23 m/s2 0.28 m/s2 2.52 m/s2 3.60 m/s2
Based on the calculations, the acceleration of this wagon along the ground is equal to: D. 3.60 m/s².
Given the following data:
Mass = 10 kg.
Angle = 35°
Force = 44 Newton.
How to calculate the acceleration along the ground?In accordance with Newton's Second Law of Motion, the net force acting on this wagon is equal to the horizontal component of the force that is parallel to the slope:
F = macosθ
Substituting the given parameters into the formula, we have;
44 = 10 × a × cos35
44 = 10a × 0.8192
44 = 8.192a
a = 44/8.192
a = 3.60 m/s²
Read more on acceleration here: https://brainly.com/question/25961211
#SPJ4
Read this article discussing the amount of time that people of various ages and education levels report spending on different technologies. Ask at least 12 of your adult friends and family members the same survey question. (The more people you ask, the better.) How do your survey results compare with the results in the article? What are some possible reasons your results might be different? When comparing the results, be sure to take into account the margin of error for the survey discussed in the article
The article is not found here but surveys are important because they are representative samples of a population.
What is a survey?A survey is a useful tool based on population samples, which is used to make statistical analyses in a given investigation.
Differences in surveys are generally due to small sample sizes, which may lead to errors in the analysis of data.
In conclusion, the article is not found here but surveys are important because they are representative samples of a population.
Learn more about surveys here:
https://brainly.com/question/13624055
#SPJ1
Which of the following is Newton's Second Law of Motion?”
“A moving object will continue to move at the same velocity until there is a change in
direction or an external force is applied to it."
"When a force acts on an object, the rate of change of momentum experienced by the
O object is proportional to the size of the force and takes place in the direction in which the
force acts.
"For every force that is exerted by one body on another, there is an equal and opposite
force exerted by the second body on the first."
"A body continues in a state of rest or of uniform velocity unless acted on by an external
force.
The symbol most often used to describe density is?
Answer:
he density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ
Explanation:
3. Classify the different types of spectra by how they are created. Physical science
Answer:
Most light sources can be classified into three main types: continuous, absorption, and emission. A hot, opaque object, like the filament in an incandescent light bulb, emits a continuous spectrum, having light of all wavelengths. A hot, dense gas is another example of an object that emits a continuous spectrum.
Explanation:
In classical physics, relative motion is absolute. For example, consider an object moving in a straight line with speed v0 on a platform. If the platform is moving with speed vp in the same direction relative to the ground, the object will be moving with speed v0 + vp relative to the ground. However, it is known that the speed of light is the same for all observers regardless of reference frame, which contradicts the classical model of relative motion. Which of the following statements is a conclusion that could be drawn from this contradiction?А. There are no absoluta celerence frames.B. All physical quantities are the same in al reference frames.C. Light can be described by a wave model and a particle model.D. Observers in different reference frames will measure time and distance differently.
Answer:
d) observers in different reference frames will measure time and distance differently
HELP ME NOW PLEASE !!!
A stone of 4.5 kg mass is falling from the top of a 60 m high multi storey building.Find the kinetic energy of the stone when it reaches the ground.
The kinetic energy will be equal to the potential energy at top
PE=mghm is mass
h is height
PE=4.5(60)(9.8)PE=2646JWhich electromagnetic has the shortest wavelength?.
Answer:
Gamma rays
Explanation:
derive a relation between critical angle and refractive index of a substance
Answer:
Explanation:
Refractive index of denser medium w.r.t rarer medium
[tex]r[/tex]ч[tex]d[/tex][tex]=\frac{1}{sini_{c} }[/tex]
where, [tex]i_{c}[/tex] = critical angle
What is physics and how does it affect every day life
Explanation:
Physics, or the study of matter, energy, and the interactions between them, helps us to understand the laws and rules that govern the physical world.
The brakes on a 17,600 N car exert a stopping force of 650. N. The car’s velocity changes from 25.0 m/s to 0 m/s.
a) What is the car’s mass?
b) What was its initial momentum?
c) What was the change in momentum for the car? d) How long does it take the braking force to bring the car to rest?
(a) The mass of the car is 1,795.92 kg
(b) The initial momentum of the car is 44,897.96 kgm/s.
(c) the change in momentum for the car is 44,897.96 kgm/s..
(d) The time it takes the braking force to bring the car to rest is 69.4 s.
Mass of the carThe mass of the car is calculated as follows;
W = mg
m = W/g
m = (17,600)/9.8
m = 1,795.92 kg
Initial momentum of the carPi = mvi
Pi = 1,795.92 x 25
Pi = 44,897.96 kgm/s
Change in momentum of the carΔP = Pf - Pi
ΔP = 0(1,795.92) - 44,897.96 kgm/s
ΔP = - 44,897.96 kgm/s
Time taken for the car to come to restF = ma
-650 = 1,795.92(a)
a = -650/1,795.92
a = -0.36 m/s²
v = u + at
0 = 25 - 0.36t
0.36t = 25
t = 69.4 s
Learn more about momentum here: https://brainly.com/question/7538238
#SPJ1
Question 19 of 20
Which force causes the protons in an atom to be attracted to one another?
OA. Strong nuclear
OB. Magnetic
OC. Weak nuclear
OD. Electric
The force that causes the protons in an atom to be attracted to one another is Strong nuclear.
What is nuclear force?Nuclear force is a force that acts between the protons and neutrons of atoms.
Neutrons and protons, both nucleons, are affected by the nuclear force almost identically and it is responsible for the attraction of protons in an atoms.
Thus, the force that causes the protons in an atom to be attracted to one another is Strong nuclear.
Learn more about Strong nuclear here: https://brainly.com/question/8695581
#SPJ1
What is the wavelength a wave if it has a frequency of 7,143 Hz and a velocity of 1,151 m/s?
Wavelength = 0.16m to 2.dp
Wavelength = wave speed / frequency
= 1,151 ÷ 7,143
= 0.1611367773
Hope this helps!
Please answer these! Will mark brainiest if correct!
Answer:
11 is d. 12 is c. 13 is b. 14 is b. 15 is b.
Explanation:
The products of nuclear fission have slightly less mass than the original atom that undergoes fission. During the process, a very large amount of energy is produced. What do you think happens to the "missing" mass in a fission reaction?
Answer:
missing mass has been converted to energy according to Einstein mass energy equation
