Answer:
No concave lens cannot be used to make hand lens because in hand Lens we use convex lens so as to converge the rays of the light After refraction and helps to produce a magnified image of an object.
Hope it will help you :)❤
The radius of a planet is three times that of Earth and its mass is nine times that of Earth. The acceleration due to gravity on this planet is _________g.
Answer:
9.836 ms^-2
Explanation:
If
r= 3re
m= 9me
But
g= Gm/r^2
G= 6.67 × 10^-11
me= 6 × 10^24 Kg
re= 6.38 × 10^6 m
g= 6.67 × 10^-11 × 9×6 × 10^24/(3 ×6.38 × 10^6)^2
g= 9.836 ms^-2
Estimate the volume of a typical home (2420 ft^2 in size and 10 ft tall) Answer in units of m^3
Answer:
volume = 683.53 [tex]m^{3}[/tex]
Explanation:
From the given question,
area = 2420 [tex]ft^{2}[/tex]
height = 10 ft = 3.048 m
But,
1 [tex]ft^{2}[/tex] = 0.092903 [tex]m^{2}[/tex]
So that,
2420 [tex]ft^{2}[/tex] = 224.8254 [tex]m^{2}[/tex]
Volume = area x distance
= 224.8254 x 3.048
= 683.5262
volume = 683.53 [tex]m^{3}[/tex]
what are conductors and insulators? Give at least five example of each
Answer: conductors are substances that allow heat or electricity to pass through . It deals with only the flow of electrons.
Eg. water, copper wire, iron rod, some ceramic materials, metallic nail.
Insulators are materials that do not allow heat or electricity to pass through.
Eg. Book, plastic, rubber, glass, paper
Explanation:
Find the inequality represented in the graph
Answer:
8
10th classpepar2021
Answer:
y ≤ 1x-1
Explanation:
line is not dotted = ___ than or equal to
shaded area below line = less than
so: ≤
--
y=mx+b
y intercept -1 (line intersects y line on -1)
y=mx-1
points (1,0) (0, -1)
find slope
---
in conclusion, y ≤ 1x - 1
hope this helped ya :-)
2)To reach an absolute pressure of 3atm, you must dive down (in water) to depth of approximately 20m.Why might someone think that the answer was 30m
Answer:
Someone might think the answer is 30 m when the person cannot distinguish between absolute pressure and gauge pressure.
Explanation:
Given absolute pressure at a depth of 20 m = 3 atm.
When you drive down 30 m in water, the gauge pressure experienced is calculated as;
P = ρgh
Where;
ρ is density of water = 1000 kg/m³
g is acceleration due to gravity, = 9.8 m/s²
h is the depth of water = 30 m
P = (1000)(9.8)(30)
P = 294000 Pa
in atm = [tex]\frac{294000}{101325} = 2.9 \ atm[/tex] ≅ 3 atm.
Thus, someone might think the answer is 30 m when the person cannot distinguish between absolute pressure and gauge pressure.
Someone might think the height (depth) is 30 meters, if he or she is unable to distinguish between gauge pressure and absolute pressure.
Given the following data:
Atmospheric pressure A = 3 atm.Height (depth) A = 20 meters.Height (depth) B = 30 meters.Scientific data:
Acceleration due to gravity = 9.8 [tex]m/s^2[/tex]Density of water = 1000 [tex]kg/m^3[/tex]To calculate the gauge pressure at a depth below the surface of a water:
Mathematically, gauge pressure is given by this formula:
[tex]P = \rho gh[/tex]
Where:
g is the acceleration due to gravity.h is the height (depth) of water.Substituting the given parameters into the formula, we have;
[tex]P = 1000 \times 9.8 \times 30[/tex]
Gauge pressure = 294000 Pa
Next, we would convert the value in Pascals to atmosphere.
Conversion:
1 atm = 101325 Pa
X atm = 294000 Pa
Cross-multiplying, we have:
[tex]X = \frac{294000}{101325}[/tex]
X = 2.90 ≈ 3.0 atm.
Read more on absolute pressure here: https://brainly.com/question/10013312
At a depth of 1030 m in Lake Baikal (a fresh water lake in Siberia), the pressure has increased by 100 atmospheres (to about 107 N/m2). By what volume has 1.0 m3 of water from the surface of the lake been compressed if it is forced down to this depth
Answer:
the volume that has 1.0m^2 of water from the surface of the lake is 4.3
Explanation:
The computation of the volume is as follows;
The Bulk modulus is
= K = 2.3 × 10^9 Pa
K = - V dP ÷ dV
dV = - V dP ÷ K
dV = - (1 × 101.3 × 1000) ÷ 2.3 × 10^9
= - 4.3 × 10^-3 m^3
So the volume that has 1.0m^2 of water from the surface of the lake is 4.3
Hence the same is relevant and considered
why can the atmosphere hold on to heat
Answer:
A. Air
Explanation:
Assume that John Travoltage and the carpet are neutral to start. After he rubbed his foot on the carpet on took negatives, what charge is on the carpet and why
Answer:
Same charge, positive.
Please see below as the answer is self-explanatory.
Explanation:
Due to the principle of conservation of the charge, if both the man and the carpet were neutral to start, any negative charge transferred to the man by the carpet, must have its positive counterpart on the carpet, so the system man + carpet can keep neutral as required by this principle, due charge can't neither created nor destroyed.A parallel-plate capacitor is made from two aluminum-foil sheets, each 3.0 cm wide and 5.00 m long. Between the sheets is a mica strip of the same width and length that is 0.0225 mm thick. What is the maximum charge?
This question is incomplete, the complete question is;
A parallel-plate capacitor is made from two aluminum-foil sheets, each 3.0 cm wide and 5.00 m long. Between the sheets is a mica strip of the same width and length that is 0.0225 mm thick. What is the maximum charge?
(The dielectric constant of mica is 5.4, and its dielectric strength is 1.00×10⁸ V/m)
Answer: the maximum charge q is 716.85 μF
Explanation:
Given data;
with = 3.0 cm = 0.03
breathe = 5.0 m
Area = 0.03 × 5 = 0.15 m²
dielectric strength E = 1.00 × 10⁸
∈₀ = 8.85 × 10⁻¹²
constant K = 5.4
maximum charge = ?
the capacitor C = KA∈₀ / d
q = cv so c = q/v
now
q/v = KA∈₀ / d
q = vKA∈₀/d = EKA∈₀
we substitute
q = (1.00 × 10⁸) × 5.4 × 0.15 × 8.85 × 10⁻¹²
q = 716.85 × 10⁻⁶ F
q = 716.85 μF
the maximum charge q is 716.85 μF
A car has a mass of 1,000 kilograms. The weight of the car is
newtons. Use g = 9.8 N/kg for gravity.
Answer : The weight of the car is 9800 N
Explanation :
It is given that,
The mass of the car, m = 1000 kg
We have to find the weight of the car. The weight of an object is defined as the force acting on it under the action of gravity. The mass of an object is the amount of matter present in it.
Using second law of motion :
W = m g
Where
m is the mass of the car
g is the acceleration due to gravity g = 9.8 N/kg
W = 1000 kg × 9.8 N/kg
W = 9800 N
So, the weight of the car is 9800 N.
Hence, this is the required solution.
Answer: The weight of the car in newtons is 9800N/kg
Explanation:
Which best describes pitch?
A) the amount of time taken for a longitudinal wave to produce one cycle
B) the number of cycles per second perceived by the human ear
C) the amplitude of a wave when the natural frequency is matched
D) the distance between two corresponding parts of a transverse wave
Answer:
B) the number of cycles per second perceived by the human ear
Explanation:
The best expression that describes pitch is that it is the number of cycles per second perceived by the human ear.
For a wave train, the number of cycles per second is frequency. Whereas the period is the amount of time taken for a longitudinal wave to produce one cycle.
The distance between two corresponding parts of a transverse wave is its wavelength.
A high pitch will correspond to a high frequency of waves perceived. A low pitch corresponds to a low frequency of waves.Help please
Stress is a ______________ that's created when we react to particular events.
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Question 2 5 pts
What signals the adrenal glands to produce more of the hormones adrenaline and cortisol and release them into the bloodstream?
Group of answer choices
hyperextension
hypothalamus
hypodermis
Flag this Question
Question 3 5 pts
When the adrenal glands produce more of the hormones adrenaline what are two of the body’s reaction to these additional hormones:
Group of answer choices
heart rate slows down and pupils constrict
blood pressure and metabolism decrease
heart rate speeds up and sweat is produced
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Question 4 5 pts
Match the following terms with their appropriate definitions.
Group of answer choices
the stress response
the events that provoke stress
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Question 5 5 pts
The article talks about building up your resilience to cope with stress. What does resilience mean?
Group of answer choices
the capacity to recover quickly from difficulties
incapable of change
not good in stressful situations
Flag this Question
Question 6 5 pts
What are two ways that you can control stress?
Group of answer choices
compulsiveness and pesim
Answer:
This doesn't seem to really be a physics problem:
In physics stress is usually defined as Young's Modulus or Bulk Modulus
In the case of Young's Modulus Y would be defined as
Y = Stress / Strain or Force / Area
So the stress would be the force acting on some particular area: in the case of a wire the area is merely the area of the wire where the force is applied.
So maybe, they mean that stress would be an increase in blood pressure or some other physiological reaction due to an externally applied force.
what heavy element was the chernobyl nuclear accelarators supposed to make?
Answer
plutonium
Explanation:
brainliest please
Which of the following remains constant during the motion of a projectile fired from a planet?
A. Momentum
B. Kinetic energy
C. Horizontal component of velocity
D. Vertical component of velocity
Answer:
C. Horizontal component of velocity
Explanation:
Object in motion stays in motion,
nothing works against its motion in the horizontal direction, unlike in the vertical direction, gravity pulls object down.
a batsman deflects a ball by an angle of 45 without changing its initial speed which is equal to 54km/h.what is the impulse imparted to the ball? mass of the ball is 0.15kg
Answer:
the impulse imparted to the ball is 4.158 kg.m/s
Explanation:
Please find attached image for diagram.
Given;
initial speed of the ball from point A, u = 54km/h = 15 m/s
angle of deflection of the ball along BOP, θ = 45⁰/2 = 22.5⁰
mass of the ball, m = 0.15 kg
the final speed of the ball along B, = u (in reverse direction)
The initial momentum of the ball, P₁ = mucosθ
The final momentum of the ball is P₂ in reverse direction to P₁.
the impulse imparted to the ball = change in momentum of the ball
J = ΔP = P₂ - P₁
J = mucosθ - (-mucosθ)
J = mucosθ + mucosθ
J = 2mucosθ
J = 2(0.15)15cos(22.5⁰)
J = 4.158 kg.m/s
Thus, the impulse imparted to the ball is 4.158 kg.m/s
John Purchased 6 Kg And 500 Kg of suger and 12kg and 400g of rice.what is the total mass of the suger and rice that he purchased?
Answer:
Total Mass = 18 kg 900 gram
Explanation:
Given:
Mass of sugar buy = 6 kg 500 gram
Mass of rice buy = 12 kg 400 gram
Find:
Total Mass
Computation:
Total Mass = Mass of sugar buy + Mass of rice buy
Total Mass = 6 kg 500 gram + 12 kg 400 gram
Total Mass = 18 kg 900 gram
12x+13y=12.01
x+y=2.323 times 10 to the 27 power
x= # of carbon - 12 atoms
y= # of carbon- 13 atoms
solve for x and y
Please help!!!!!
Answer:
[tex]y = - 2.7876 * 10^{28}[/tex]
[tex]x= 3.0199 * 10^{28}[/tex]
Explanation:
Given
[tex]12x+13y=12.01[/tex]
[tex]x+y=2.323 * 10^{27}[/tex]
Required:
Solve
Make x the subject in [tex]x+y=2.323 * 10^{27}[/tex]
[tex]x=2.323 * 10^{27} - y[/tex]
Substitute the above expression for y in [tex]12x+13y=12.01[/tex]
[tex]12(2.323 * 10^{27} - y) + 13y = 12.01[/tex]
Open brackets
[tex]12*2.323 * 10^{27} - 12y + 13y = 12.01[/tex]
[tex]12*2.323 * 10^{27} + y = 12.01[/tex]
Collect Like Terms
[tex]y = 12.01 - 12*2.323 * 10^{27}[/tex]
[tex]y = 12.01 - 2.7876 * 10^{28}[/tex]
12.01 is negligible compared to [tex]2.7876 * 10^{28}[/tex]
So:
[tex]y = - 2.7876 * 10^{28}[/tex]
Substitute the above expression for y in [tex]x=2.323 * 10^{27} - y[/tex]
[tex]x=2.323 * 10^{27} - (- 2.7876 * 10^{28})[/tex]
[tex]x=2.323 * 10^{27} + 2.7876 * 10^{28}[/tex]
[tex]x= 0.2323 * 10^{28} + 2.7876 * 10^{28}[/tex]
[tex]x= 3.0199 * 10^{28}[/tex]
What is the force of gravitational attraction between an object with a mass of 2kg and another that has a mass of 2kg and a distance between them of 2.5 m
Answer:
Explanation:
F = 0.000000000042716 or 4.2688e-11
G = 6.67 × 10−11 Nm2 /kg2
m1 = 2kg
m2 = 2kg
R = 2.5 m ⇒ R^2 = 6.25
F = 6.67 × 10^−11 ( 2 * 2) / 6.25
⇒ F = 6.67 × 10^−11 (4) / 6.25
⇒ F = 2.668e-10 / 6.25
∴ F = 4.2688e-11
which quantity is a vector quantity?
Which three statements about electrical circuits are true?
A.
They provide a way of transferring electrical energy.
B.
They cause electrons to flow downhill.
C.
When closed, they allow electrons to flow in a loop.
D.
They allow electrons to flow toward a positively charged area.
Answer:
A.
Explanation:
No work is done by an object at rest because.
1) no force is acting on the object.
2) no distance is moved.
3) heat is not produced.
4) friction is acting on the object
Answer:
no distance is moved as w=f×d
4. Mr. Ames is dragging a box full of books from his office to his car. The box and books together have a
combined weight of 134 N. If the coefficient of static friction between the pavement and the box is 0.55, low hard
must Mr. Ames push horizontally on the box in order to start it moving?[74N]
Answer:
F = 73.7 N = 74 N (rounding off)
Explanation:
In order to get the box to start moving, Mr. Ames must push it with a force equal to the frictional force acting on it. Therefore, this force can be calculated through the following formula:
[tex]F = frictional force = \mu R[/tex]
where,
μ = coefficient of friction = 0.55
R = Normal Force on Box = Weight of Box with books = 134 N
Therefore,
[tex]F = (0.55)(134\ N)\\[/tex]
F = 73.7 N = 74 N (rounding off)
the total positive charge is QQQ = 1.62×10−6 CC , what is the magnitude of the electric field caused by this charge at point P, a distance ddd = 1.53 mm from the charge
Answer:
6.1 × 10^9 Nm-1
Explanation:
The electric field is given by
E= Kq/d^2
Where;
K= Coulombs constant = 9.0 × 10^9 C
q = magnitude of charge = 1.62×10−6 C
d = distance of separation = 1.53 mm = 1.55 × 10^-3 m
E= 9.0 × 10^9 × 1.62×10−6/(1.55 × 10^-3 )^2
E= 14.58 × 10^3/2.4 × 10^-6
E= 6.1 × 10^9 Nm-1
A coil with 25 turns of wire is moving in a uniform magnetic field of 1.5 T. The magnetic field is perpendicular to the plane of the coil. The coil has a crosssectional area of 0.80 m2
. The coil exits the field in 1.0 s.
Find the induced emf.
Given that,
Number of turns, N = 25
Magnetic field, B = 1.5 T
The coil has a crosssectional area of 0.80 m2
The coil exits the field in 1.0 s.
To find,
Induced emf in the coil.
Solution,
The induced emf in the coil is given by :
[tex]\epsilon=\dfrac{-d\phi}{dt}\\\\=\dfrac{dB}{dt}\\\\=\dfrac{NBA}{t}\\\\=\dfrac{25\times 1.5\times 0.8}{1}\\\\=30\ V[/tex]
So, the induced emf in the coil is 30 V.
a device that consist audio information in electrical signal is
Answer:
Electromechanical transducer,
Explanation:
this is the answer I hope u got it
Answer:
yes it is a correct answer
The graph shows the amplitude of a passing wave over time in seconds (s). What is the approximate frequency of the wave shown?
A.6 Hz
B.0.3 Hz
C.0.7 Hz
D.3 Hz
Answer:
B) 0.3Hz
Explanation:
I just took the test i hope i helped and i hope you pass the test
Answer:.5
Explanation:
I took the quiz
what is letaral inversion?
Answer:
Lateral inversion is a phenomenon in which left appears to be right and vice versa. It is due to direction that light follows when it strikes a reflecting surface, generally a mirror.
whats 100+50+89+2000☹️
Answer:
2239
Explanation: Stack addition
Answer: 2,239
Explanation: do 2OOO + 1OO + 5O + 89, that will give you 2,239.
The gravitational attraction between two objects increases if
Answer:
they are closer!!
Explanation:
Hope this helped!! :D
An electron remains suspended between the surface of the Earth (assumed neutral) and a fixed positive point charge, at a distance of 5.3 m from the point charge. Determine the charge required for this to happen.
This question is not complete, the complete question is;
An electron remains suspended between the surface of the Earth (assumed neutral) and a fixed positive point charge, at a distance of 5.3 m from the point charge. Determine the charge required for this to happen. The acceleration due to gravity is 9.8 m/s² and the Coulomb constant is 8.98755 x 10⁹ N.m²/C². Answer in units of C.
Answer: the charge required for this to happen is 1.7415 × 10¹⁹ C
Explanation:
Given the data in the question;
we know that gravitational force on electro = M×g
mass of electron m = 9.10938356 × 10⁻³¹ kilograms
charge of electron e = 1.60217662 × 10⁻¹⁹ coulombs
given that distance r = 5.3m and the Coulomb constant = 8.98755 x 10⁹ N.m²/C²
g = 9.8 m/s²
Now for the electron to be suspended, This will happen only if the electrostatic force is equal to weight of electron;
[ (1/4πε0) × q × e] / r² = m × g
so we substitute
8.98755 x 10⁹ × q × 1.60217662 × 10⁻¹⁹/[5.3]² = 9.10938356 × 10⁻³¹ × 9.8
q = 8.9271 × 10⁻³⁰ / 5.1262 × 10⁻¹¹
q = 1.7415 × 10¹⁹ C
Therefore the charge required for this to happen is 1.7415 × 10¹⁹ C
[1.43996 × 10⁹ × q] / 29.09 = 8.92719 x 10⁻³⁰
1.43996 × 10⁹ × q = 2.5969 × 10⁻²⁶
q = 2.5969 × 10⁻²⁶ / 1.43996 × 10⁹
q =