Answer:
The greatest pressure is 2178 Pa
Explanation:
Pressure
It's the force applied perpendicular to the surface of an object per unit area over which the force is distributed.
If F is the force applied and A is the surface area, the pressure is calculated as:
[tex]\displaystyle P=\frac{F}{A}[/tex]
The brick has dimensions of 25 cm by 9 cm by 5 cm. There are three possible areas of contact:
[tex]A_1=25*9 = 225 cm^2=0.0225\ m^2[/tex]
[tex]A_2=25*5= 125 cm^2=0.0125\ m^2[/tex]
[tex]A_3=9*5= 45 cm^2=0.0045\ m^2[/tex]
The brick has a mass of m=1000 g = 1 Kg and exerts a force equal to its weight when placed on a flat surface, thus:
F = m.g = 1 * 9.8 = 9.8 N
The greatest possible pressure will occur when the area is the least possible [tex](0.0045\ m^2)[/tex], since the pressure and the area are inversely proportional, thus:
[tex]\displaystyle P_{max}=\frac{9.8}{0.0045}[/tex]
[tex]\displaystyle P_{max}=2178 \ Pa[/tex]
The greatest pressure is 2178 Pa
Which element is most likely to have an oxidation number of +1?
O A. 1
B. Ar
Ос. К
D. Be
Answer:
K
Explanation:
.........................
How could you cause a chemical change to vinegar?
Answer: Any chemical reaction is an example of a chemical change. Examples include: Combining baking soda and vinegar (which bubbles off carbon dioxide gas)Jan 13, 2020
Explanation:
Help I'm struggling
Answer:
a. 10 Amps
b. 22 Ohms
c. 220 kW·h
d. $13.2
Explanation:
a. The question is with regards electric power, "P", which is given as follows;
P = I × V
Where;
P = The power generated by electric current
I = The current flowing in the circuit (through the resistance, R)
V = The voltage in the circuit
The given parameters of the electric oven are;
The resistance of the electric oven = R
The power consumed by the electric oven, P = 2200 W
The voltage at which the electric oven is working, V = 220 V
Therefore, from the equation for power, P = I × V, we have;
I = P / V
Therefore, we have;
I = 2,200 W/(220 V) = 10 Amps
b. The velocity, V = I × R
Where;
I = The current flowing
R = The resistance of the circuit
By making "R" the subject of the equation for voltage, "V", we have;
R = V/I = 220 V/(10 A) = 22 Ohms
c. The number of hours per day the resistor is used = 4 hours
The number of hours the resistor is used in 1 month (30 days) = 30 × 4 hours, t = 120 hours
The electric energy, E = P × t = 2200 W × 120 h = 220000 W·h = 220 kW·h
d. If electric energy costs, C = 0.06$/kW·h
Therefore, the cost to operate the electric oven during 1 month = 0.06$ × 220 kW·h = $13.2
a closed system stores 500 joules of energy. the system is not used for accessed. how much energy will it have one month later? how do you know?
In classical physics terms, you do work on an object when you exert a force on the object causing it to move some distance. The amount of work you actually do may have little relationship to the amount of effort you apply. For example, if you push on a car stuck in a snow drift, you may exert a lot of force (and effort) but if the car does not budge, you have not done any work! In order for work to be done on an object, the object must move some distance as a result of the force you apply. There are also constraints on the force you apply. Only force exerted in the same direction as the movement of the object result in work. You may think that you do a lot of work if you carry an arm full of books from home to school. In reality you do no work at all! In carrying the stack of books, you exert an upward force to hold the books so they don't fall to the ground. There is no movement associated with this force. As you walk, the motion of the books is horizontal not vertical. Since the force applied to the books is vertical, and the motion is horizontal, you do not do any work on the books.
Work is a transfer of energy so work is done on an object when you transfer energy to that object. The amount of work done on an object depends on the amount of force exerted on the object and the amount of distance the object moves.
Work = Force x Distance
According to Newton's Second Law of Motion, the net force on an object is dependent on the mass of the object, and its acceleration during the movement.
Force = Mass x Acceleration
The common unit of force is the Newton (N). One Newton is the force required to accelerate one kilogram of mass at 1 meter per second per second.
1 N = 1kg m/s2
The amount of work done to push a 10,000 N car a distance of 10 meters would be
10,000 N x 10 m = 100,000 N m or 100,000 J
The Newton-meters are termed joules (J). The joule is named after James Prescott Joule (1818-1889) who first calculated the amount of electrical work needed to produce a unit of heat. In his experiments, Joule discovered that the same amount of heat was produced by the same amount of either electrical or mechanical work ("the mechanical equivalent of heat").
Learn more about work here.
Which of the following is true about myelin?
It inhibits neural communication.
O It cannot be affected by illness.
It is covered by axons.
It's a fatty insulation.
It slows down neuronal operations.
Answer:
It's a fatty insulation.
Explanation:
"Myelin" is a fatty substance which insulates the axons of the nerve cells. Therefore, it covers the axons. This makes choice A correct and choice C incorrect.
This allows faster neural communication or hastens the transmission of signals between neurons. This makes choice A incorrect and choice E incorrect. It doesn't inhibit neural communication nor does it slow down neuronal operation; rather, it increases both speed.
Myelin can be affected by illness. An example of this is the disease called "Multiple Sclerosis," which targets the myelin sheath.
HELP PLS .. The half-life of potassium-44 is 22 minutes. It decays into calcium-44. After
66 minutes, what fraction of the original amount of potassium-44 in a sample
will still be potassium?
Answer:
B. 1/8
Explanation:
did the test !!
Answer: 1/8
Explanation:
Just took the test
How much work is required to move an electron
through a potential difference of 3.00 volts?
(1) 5.33 × 10^–20 J (3) 3.00 J
(2) 4.80 × 10^–19 J (4) 1.88 × 10^19 J
Answer:
(2) the work required to move the electron is 4.8 x 10⁻¹⁹ J.
Explanation:
Given;
potential difference, V = 3.00 volts
charge of electron, q = 1.6 x 10⁻¹⁹ C
The work required to move an electron is calculated as;
W = Vq
where;
W is the work done in Joules
Substitute the given values and solve for W;
W = (3.00)(1.6 x 10⁻¹⁹)
W = 4.8 x 10⁻¹⁹ J.
Therefore, the work required to move the electron is 4.8 x 10⁻¹⁹ J.
A block attached to a spring with unknown spring constant oscillates with a period of 8.0 ss . Parts a to d are independent questions, each referring to the initial situation. What is the period if Part A The mass is doubled
Answer:
What is the period if Part A The mass is doubled
T = √2 * 8 = 11.313 s
Explanation:
The equation for the period of an object attached to a spring is express as:
T=2π[tex]\sqrt{m/k}[/tex]=
Where m is the mass and k is the spring constant
If the mass is doubled:
T = √2 * 8 = 11.313 s
The new time period will be 11.312 secons
The time period (T) of the oscillation in a spring with spring constant k, attached to an object of mass m is:
[tex]T=2\pi \sqrt{\frac{m}{k} }[/tex]
T = 8 seconds (given)
Now if the mass is doubled, [tex]m^{'}=2m[/tex]
then time period [tex]T^'[/tex]:
[tex]T^{'}=2\pi \sqrt{\frac{m^'}{k} } \\\\T^{'}=2\pi \sqrt{\frac{2m}{k} } \\\\T^'}=\sqrt{2}T\\\\T^'}=1.414*8\\\\T^'}=11.312[/tex]seconds will be the new time period.
Learn more about spring oscillations:
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In a ______ solar system, the planets orbit around the sun.
A. Geocentric
B. Monolithic
C. Heliocentric
D. Pericentric
in science, the inquiry process involves observing, questioning, ________, and summarizing.
Answer:
proceesing
Explanation:
Answer:
predicting
Explanation:
for ap3x users
A car is coasting backwards downhill at a speed of 3.0 m/s when the driver gets the engine started. After 2.5
s, the car is moving uphill at 4.5 m/s. Assuming that uphill is positive direction, what is the car's average
acceleration.
Answer:
0.6m/s²
Explanation:
Given parameters:
Initial velocity = 3m/s
Final velocity = 4.5m/s
Time taken = 2.4s
Unknown:
Average acceleration = ?
Solution:
To solve this problem, we use the expression:
Acceleration = [tex]\frac{v - u}{t}[/tex]
v is the final velocity
u is the initial velocity
t is the time taken
Acceleration = [tex]\frac{4.5 - 3}{2.5}[/tex] = 0.6m/s²
8
Which subatomic particle does not have a charge? *
protons
neutrons
Or electrons ?
Answer:
Answer is neutrons.
Explanation:
The nucleus contains two types of subatomic particles, protons and neutrons.the protons have a positive electrical charge and the neutrons have no electrical charge.
I hope it's helpful!
A student throws a 0.22 kg rock horizontally at 20.0 m/s from 10.0 m above the ground. Find the initial kinetic energy of the rock.
Answer:
44J
Explanation:
Given parameters:
Mass of rock = 0.22kg
Initial velocity = 20m/s
Distance moved = 10m
Unknown:
Initial kinetic energy of the rock = ?
Solution:
To solve this problem, we need to understand that kinetic energy is the energy due to the motion of a body.
It is mathematically expressed as;
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
Kinetic energy = [tex]\frac{1}{2}[/tex] x 0.22 x 20² = 44J
Which scientific discovery commonly attributed to Newton did Hooke also claim to have played a major role in?
studies into nature of light
development of telescopes
law of gravitation
laws of motion
Answer:
laws of gravitation
Explanation:
my school has the same course as yours and i got it right
A stationary block of mass 35 Kg is suspended on a string.What is the tension in the string ?( Neglect the mass of the string)
Answer:
Tstring = 343.35 [N]
Explanation:
Since the block is in equilibrium, we can say that the sum of the forces on the Y-axis or vertical is equal to zero.
∑Fy = 0
[tex]T_{string}-W=0[/tex]
where:
Tstring = tension of the string [N]
W = weight of the block [N]
And the weight can be calculated multiplying the mass of the block by the gravity acceleration.
Now replacing:
[tex]T_{string}=m*g\\T_{string}=35*9.81\\T_{string}=343.35[N][/tex]
What controls how fast an object falls?
Answer:
gravity
Explanation:
it controls how fast an object falls
what is a amplitude????????
Help please! Will give brainliest to first correct answer!
Answer:
1) Addition of a catalyst
2) To change the reaction rate of slope B to look like slope A, simply add a catalyst to speed up the rate of reaction, giving you a higher amount of products in a shorter amount of time (line A)
Explanation:
1 and 2)Two things can alter the rate of a reaction, either the addition of a catylist which will not alter the composition of the products or reactants, but will accelerate the reaction time, or an increase in temperature will also increase the rate at which a reaction will occur.
You could choose temperature also and have the same result, it's your choice both are correct, but catalyst is the easiest.
I NEED ANSWERS!
Give an example of how energy flows in a system. Come up
with an example that was not explained in the text.
Answer:
A water fall?
Explanation:
It's an example I took in my science class
"For example, when you exercise you get hot. The heat you feel in your body results from the energy transfers that happen when you move. When you sweat, your body expends energy to cool itself down. A food chain shows how energy flows from one organism to another."
What moves in and out of an open system like the human body?
Carbon dioxide because that's what we breath out?
An object has an initial velocity of 15 m/s. How long must it accelerate at a constant rate of 3.0 m/s^2 before its final velocity is equal 30 m/s?
Answer: v=u + at
V= Final velocity =30m/s
U= initial velocity = 15m/s
a= acceleration = 3m/s^2
t= time taken
t=(v-u)/a
t=(30-15)/3
t=5s
Explanation:
The table above lists the wavelength range, frequency range, possible uses, and hazards of the seven types of electromagnetic radiation. Which type of radiation helps doctors image the interior of the human body but also causes cell damage?
A.
microwave
B.
infrared
C.
radio wave
D.
X-ray
Wings produce a downward force .Why would this be useful to a race car?
Answer:
it increases drag
Explanation:
To impart the greatest momentum to an object, should
you exert the largest force possible, extend that force for
as long a time as possible, or both? Explain.
What was the trend in pesticide use between 1960 and 1980?
Answer:
USDA ERS
Explanation:
咯啦 体会i似水 THIS IS MY ANSWER
Answer:
i think it's the trend of using machinery, and fuel for mechanical weed control.
person who answering get 100
points plz
Answer:
the one above is rigth
Explanation:
Do all the bulbs have the same brightness?
Answer:
No
Explanation:
Some our led some our more on the yellow side
Answer
All Bulbs DO NOT have the same brightness.
Explanation:
Since each bulb has different resistance, it glows with different brightness. If current passes through it according to each bulb's requirement,then the bulbs will glow by using their maximum power and will glow with different brightness.
2. An object with a mass of 3.8 kg has four forces acting on it.
4.7N
6.2 N
3.8 kg
6.2 N
F2
If the object has a net force of 12.5 N down, what is the magnitude, in Newtons, of the unknown force?
Answer:4.7N
Explanation:both of the sides are equal
The net force acting on 3.8 kg object is given 12.5 N. Thus individual forces acting downwards will be 6.2 N each. Thus, the unknown force which balance the other force is 4.7 N.
What is force?Force is an external agent acting on an object to deform it or to change it from the state of rest or motion. There are various kinds of forces such as magnetic force, frictional force, gravitational force etc.
If two forces are acting from the same direction of an object, the net force will be their sum. If they are acting in opposite directions, then the opposite forces will can cancel each other.
Here the net force is 12.5 which will be the sum of the force of 6.2 N both acting downwards. The force 4.7 is cancelled here by an equal and opposite force. Therefore, the unknown force is 4.7 N.
To find more on force, refer here:
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A 6.50 meter high cylinder is filled with alcohol(density =806 kg/m^3). What is the pressure at the bottom of the cylinder?
Answer:
152642.2
Explanation:
the pressure at the bottom of the cylinder is
P = Po + rho gh
=101300+806(9.8)(6.5)
=152642.2 Pa
The pressure at the bottom of the cylinder is 152642.2 Pa
What's pressure?If the density of the liquid is ρ then the burden of the liquid inside the first cylinder is W1=ρh1S1g and the strain at the bottom of the primary cylinder (neglecting atmospheric strain) is P1=W1/S1=ρh1g.
Stress, inside the physical sciences, is the perpendicular force according to unit location, or the strain at a point inside a confined fluid.
Calculation:-
pressure = ρgh⇒806 kg/m^3(10)*6.50
⇒152642.2 Pa
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I just need help with physics (in regards of kinetic energy, gravitational potential energy, work, work and mechanical objects) since I don't understand it at all. thank you to those who can/will help!
Answer:
First, the total energy of an object is E, and this is conserved if we do not interact with the object.
We can write:
E = U + K
Where U is the potential energy. For an object of mass M that is lifted a height H from the ground, the potential energy is:
U = M*g*H
where g is the gravitational acceleration. g = 9.8m/s^2
And K is the kinetic energy, written as:
K = (M/2)*v^2
where v is the velocity of the object.
a) We have an object with mass M = 80kg, lifted at a height H = 10m.
The gravitational potential energy is then:
U = 80kg*9.8m/s^2*10m = 7,804 J
And because the object is not moving, the velocity is equal to zero, then at this point the kinetic energy is equal to zero, which will mean that the total energy E is equal to the potential energy.
b) At the instant before hitting the ground the height of the object is near zero, then at this point the potential energy is almost zero, which means that all the potential energy has transformed into kinetic energy. Then the kinetic energy at this point should be:
K = 7,804 J
c) Work is defined as a force doing a motion.
W = F*d
F = force.
d = distance.
In this case, the force is the weight of the object.
Weight = 80kg*9.8m/s^2 = 784N
And the distance that the object moves is 10 meters, then the work done is:
W = 784N*10m = 7,840 J
d) The final velocity v can be obtained from the kinetic energy.
We know that K = (80kg/2)*v^2 = 7,840 J
v^2 = 7,840 J/40kg
v = √( 7,840 J/40kg) = 14m/s
