One of the advantage of circuit breaker over fuses is tripped circuit breakers do not need to be replaced as fuse does power is in rapid restoration with breakers.
What are circuit breakers?A circuit breaker is an electrical device similar to electrical switches designed to protect the circuit from damges created by over current or short circuit.
Circuit breakers can be operated manually or automatically for saving the electrical network and components. Fuse is another saftey device to provide protection from overcurrent. It is operating automatically and it melts when over current is passed.
Even though fuses can be easily operated and less expensive, power cannot be restored after tripping the fuse whereas, tripped circuit breakers need not be replaced and easily restore the energy as soon.
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Is a bird sitting motionless on a perch, balanced or unbalanced?
32) In an electrical circuit the current is measured in
A) amps using an ammeter.
B) amps using a voltmeter.
C) volts using an ammeter.
D) volts using a voltmeter.
Answer:
A) amps using an ammeter.....
4. A substance is cut into several piece and compared to the density of the
original sample. The density of each piece will be:-
areater
bl the same
Answer:
The density pf each piece will be the same, since density is defined as a mass per unit volume, so even when you cut an object it will not change
Which of the following is NOT available for drinking
A) groundwater
B) lakes
C) rivers with tributaries
D) frozen ice caps
Answer:
B
Explanation:
lakes are too big or largeA toy remote car drives in a circle. It makes 2 revolutions in 20 seconds. What is the period of the object?
Answer:
T = 10 seconds
Explanation:
Given that,
A remote car makes 2 revolutions in 20 seconds.
We need to find the period of the object.
It means, it will make [tex]\dfrac{2}{20}=0.1\ \text{revolutions/second}[/tex] .
lt T be the period of the object. So,
[tex]T=\dfrac{1}{0.1}\\\\T=10\ s[/tex]
It will take 10 seconds for one revolution.
A dipole is centered at the origin, with its axis along the axis, so that at locations on the axis, the electric field due to the dipole is given by E = (0, 1/4 pi epsilon_0 2qs/gamma^3, 0) v/m The charges making up the dipole are q_1 = +4 nC and q_2 = nC, and the dipole separation is s = 8 mm. What is the potential difference along a path starting at location p_1 = (0, 0.04, 0) m and ending at location P_2 = (0, 0.05, 0) m?
Answer:
Explanation:
Given that:
[tex]q_1 = + 4nC \\ \\ q_2 = -4nC \\ \\ q = 4nC[/tex]
[tex]P_1 = (0,0.04,0) m\\\\ P_2 = (0,0.05,0) m[/tex]
As [tex]q_1[/tex] [tex]\text{is nearer to }[/tex][tex]P_1 \& P_2[/tex] then [tex]q_2,q_1[/tex] [tex]\text{is positive, Thus}[/tex], [tex]E \limits^{\to}[/tex][tex]\text{ will be along the positive X-axis.}[/tex]
Recall that:
[tex]E ^{\to} = \dfrac{-dV}{dr}\implies E_y = \dfrac{-dV}{dy} \\ \\ = \int^{P_2}_{P_1}dV = -\int \limits ^{(0.05)}_{(0.04)}E_y \ dy \\ \\ \implies (V_{P_2}}-V_{(P_1)}) = \dfrac{-2q_5}{4 \pi \varepsilon _o} \int \limits ^{(0.05)}_{(0.04)} \dfrac{dy}{y^3} \\ \\ \implies (V_{P_2}}-V_{(P_1)}) = \dfrac{-2q_5}{4 \pi \varepsilon _o} \Big[ \dfrac{-1}{2y^2} \Big]^{0.05}_{0.04} \\ \\ \implies (V_{P_2}}-V_{(P_1)}) = \dfrac{q_5}{4 \pi \varepsilon _o} \Big[\dfrac{1}{y^2}\Big] ^{0.05}_{0.04}[/tex]
[tex]\\ \\ \implies (V_{P_2}}-V_{P_1}) = \dfrac{(4\times 10^{-9})(8\times 10^{-3})}{4 \pi (8.854 \times 10^{-12})} \Big [\dfrac{1}{(0.05)^2}-\dfrac{1}{(0.04)^2} \Big ]V \\ \\ (V_{P_2}}-V_{P_1}) = \mathbf{-64.71 \ volts}[/tex]
in the equation for the gravitational force between two objects which quantity must be squared?
Answer:
Distance
Explanation:
trust me
Answer:
The distance "r" must be squared
Explanation:
In the equation F=GMm/r^2, the distance "r" is squared, which represents the distance between masses M and m and G is the gravitational constant.
13. Using Newton's 2nd law, explain why it takes more force to push a 50 kg adult than a 25 kg child along the same surface.
please please please hellpppppppp!!!!!!
Answer:
The Answer is A
Explanation:
please help me guys please please please please please please please please please please please please please
Answer:
1.F = 256 N
2.a = 8 m/s/s
By looking at the given information, you know force, and an acceleration. Therefore you have enough information to use the first formula.
F = ma
256 N = m * 8 m/s/s
m = 256 N/8 m/s/s
m = 32 Kg
What do you need to include in a free body diagram?
Answer:
Interact with it
Explanation:
The body in a condensed form (often a dot or a box)
Straight arrows pointing in the direction in which forces act on the body are represented.
Moments are portrayed by curved arrows pointing in the direction in which they impact the body.
A coordinate system is a series of coordinates.
A 75 kg baseball player runs at a velocity of 6 m/s and sliding 2 m what is the force of friction that acts upon him?
Answer:
1350N
Explanation:
Given data
mass= 75kg
velocity= 6m/s
distance= 2m
The expression for the applied force is given as
F= mv^2/d
Substitute
F= 75*(6)^2/ 2
F= 75*36/2
F= 2700/2
F= 1350N
Hence the force is 1350N
A 5 kg object moving to the right at 4 m/s collides inelastically with a 5 kg object
moving to the left at 4 m/s. The final velocity of both objects will be
Answer:
The linear momentum of a particle with mass m moving with velocity v is defined as
p = mv (7.1)
Linear momentum is a vector . When giving the linear momentum of a particle you must
specify its magnitude and direction. We can see from the definition that its units must be
kg·m
s
. Oddly enough, this combination of SI units does not have a commonly–used named so
we leave it as kg·m
s
!
The momentum of a particle is related to the net force on that particle in a simple way;
since the mass of a particle remains constant, if we take the time derivative of a particle’s
momentum we find
dp
dt = m
dv
dt = ma = Fnet
so that
Fnet =
dp
dt (7.2)
Please help me, I'm not good in physics.
You press your physics textbook flat against a vertical wall with your hand. What is the direction of the friction force exerted by the wall on the book? (a) downward (b) upward (c) out from the wall (d) into the wall. (Serway and Jewett, 2009) What type of friction is present?
Answer:
Upward direction.
The friction is kinetic friction
.A 0.6 kg basketball is thrown straight up at a velocity of 4 m/s. What is the initial kinetic energy of the basketball?
Answer:
the initial kinetic energy of the basket ball is 4.8 J
Explanation:
The computation of the initial kinetic energy of the basket ball is shown below:
As we know that
Initial kinetic energy is
[tex]= \frac{1}{2}mv^2 \\\\= \frac{1}{2}\times 0.6 \times (4m/s)^2\\\\= \frac{1}{2}\times 0.6 \times 16m/s^2\\\\= 4.8 J[/tex]
Hence, the initial kinetic energy of the basket ball is 4.8 J
The pressure due to the liquid on an object immersed in that liquid is 4500 Pa
The density of the liquid is 900 kg/m.
What is the depth of the object below the surface of the liquid ?
Answer:
The depth of the object below the surface of the liquid is 0.510 meters.
Explanation:
The hydrostatic pressure ([tex]P[/tex]), measured in pascals, experimented by the object is directly proportional to density of the fluid ([tex]\rho[/tex]), measured in kilograms per cubic meter, gravitational acceleration ([tex]g[/tex]), measured in meters per square second, and depth of the object ([tex]h[/tex]), measured in meters. That is:
[tex]P = \rho\cdot g \cdot h[/tex] (1)
If we know that [tex]P = 4500\,Pa[/tex], [tex]\rho = 900\,\frac{kg}{m^{3}}[/tex] and [tex]g = 9.807\,\frac{m}{s^{2}}[/tex], then the depth of the object is:
[tex]h = \frac{P}{\rho\cdot g}[/tex]
[tex]h = \frac{4500\,Pa}{\left(900\,\frac{kg}{m^{3}} \right)\cdot \left(9.807\,\frac{m}{s^{2}} \right)}[/tex]
[tex]h = 0.510\,m[/tex]
The depth of the object below the surface of the liquid is 0.510 meters.
The depth of the object below the liquid's surface will be
"0.510 m".
Pressure and DensityAccording to the question,
Object immersed, P = 4500 Pa
Density of liquid, ρ = 900 kg/m³
Acceleration due to gravity, g = 9.8 m/s²
We know the relation,
→ Hydrostatic pressure (P) = ρ.g.h
or,
Depth will be:
→ h = [tex]\frac{P}{\rho .g}[/tex]
By substituting the values,
= [tex]\frac{4500}{900\times 9.8}[/tex]
= [tex]\frac{4500}{8820}[/tex]
= 0.510 m
Thus the above answer is appropriate.
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Can anyone help me with this? Will give brainliest if correct!
Answer:
Explanation:
HELP ME WRITE A ONE PAGE ESSAY TO EXPLAIN THE AUTHOR'S PURPOSE IN WRITING HOM SMART ARE ANIMAL
A student places his hand in front of a plane mirror as shown in the diagram. Which terms correctly describe the image that the mirror forms?
What came first, a chicken or an egg
Answer:
a chicken
a chicken came first
Answer:
A Chicken
A chicken came first
Explain the difference between mass and weight. Also, what happens to your mass and your weight if you were to travel to the moon? Why?
PLEASE HURRY!!
What is the net force on a 100kg object accelerating at 3 m/s
Answer:hence, the force needed to accelerate the 1000kg car by 3m/s2 is 3000N
Explanation:
plz mark as brainlyist plz
when you come out of a river you feel cold. why?
Answer:
the wind
Explanation:
7. Roughly how much did the cost of PV solar panels decrease between 2008 and 2015?
40%
80%
60%
20%
US 0
A car is travelling along a level road. When the velocity of the car is constant, the force of friction on it is
Hi! Can somebody please help?
Answer:
Diagram A will reach the top first.
Explanation:
If it is going straight, it will go slower. The higher the movement speed the faster it is. Hope this helps!
An object travels a distance of 56 meters to the right in 7 seconds. What is the object's velocity?
Explanation:
Distance travelled (d) = 56 metres
Time taken (t) = 7 seconds
velocity of the object (V)
= d / t
= 56 / 7
= 8 m/s
The velocity of the object is 8 m/s.
Hope it will help :)
How to calculate the power of electricity from P=W/t
Answer:
One joule also equals the energy required to move an electric charge of one coulomb through an electric potential difference of one volt (J = C · V). Power (P) is the rate at which energy is transferred or converted. Thus, power equals work divided by time (P = W / t).
I hope it's helpful!
What is the pressure of the water coming out the bottom of a water tower that is 50 m
high in the air. (Density of water (1000kg/m^3).
Answer:
49,000 Pa
49 kPa
Explanation:
P (pressure)= hρg, where h= height, ρ=density, and g= acceleration due to gravity.
50 m * 1000kg/m³ * 9.8 m/s²
=49,000 kg*m⁻¹s⁻² OR 49,000 Pa OR 49 kPa
What would scientists using classical, Newtonian physics expect to observe
during the photoelectric effect?
A. That enough light of any frequency would cause electrons to flow
O B. That light above a certain frequency would not cause electrons to
flow
O C. That no light would cause electrons to flow
O D. That light below a certain frequency would not cause electrons to
flow
Answer:
A. That enough light of any frequency would cause electrons to flow.
Explanation:
A P E X
Scientists using classical, Newtonian physics expect to observe the photoelectric effect because enough light of any frequency would cause electrons to flow.
What is the photoelectric effect?When a medium receives electromagnetic radiation, electrostatically charged particles are emitted from or inside it.
The emission of ions from a steel plate when light falls on it is a common definition of the effect. The substance could be a solid, liquid, or gas; and the released particles could be protons or electrons.
Scientists using classical, Newtonian physics expect to observe the photoelectric effect because enough light of any frequency would cause electrons to flow.
The flow of the electron is a must to understand the photo electric effect.
Hence option A is correct.
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PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer this correctly!!!! (40pts)
Answer:
Explanation:
According to this site, "The purpose of these curved wingtips is to prevent high air pressure above the airplane from flowing over and under the wings."
Hope this helps!