Explanation:
The resources that we value—time, money, labor, tools, land, and raw materials—exist in limited supply. There are simply never enough resources to meet all our needs and desires.
Explanation:
Time, money, labor, land , and raw materials
Is this right?? please help me. IT IS SOCIOLOGY!!
Answer:
Yes, it is correct : )
Explanation:
Hope this helps!
Answer:
yes, this is correct.
Explanation:
what are the two types of covalent bonds ? provide a description of each
Answer: Polar and Nonpolar
Polar molecules occur when there is an electronegativity difference between the bonded atoms.
Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out
How should ready-to-eat food be stored after it has cooled?
Answer:
The answer is most likely C.
Ready-to-eat foods are stored at the top of the fridge, away from raw foods so that harmful bacteria cannot transfer from the raw food to the cooked food. Raw meat, poultry and fish in sealed containers to stop them touching or dripping onto other foods.
Answer:
Explanation:
uncovered
Determine the angle between the 12 and the 4 on the face of a clock in radians, degrees and revolution
Answer:
Angle - 120 degrees, 2.093 radians and 0.33 revolution
Explanation:
Minute hand is on the 12 and the hour hand is on the 4.
The angle formed between 4 and 12 is
[tex]\frac{4}{12} * 360 = 120[/tex] degrees
The angle formed between 4 and 12 in radian is
[tex]\frac{\pi }{180} * 120 = 2.093[/tex] radians
The angle formed between 4 and 12 in revolution is
[tex]\frac{2.093 }{2 \pi } \\= \frac{2.093 }{2* 3.14} \\= 0.33[/tex] revolution
PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer these correctly!!!! (40pts)
Answer:
False
Explanation:
The ground or surface cannot give off energy
(correct me if i am worng) :)
To prevent injuries you should do a warm up and cool down.
True or False
Answer:
true
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Answer:
True
Explanation:
A warm-up revs up your cardiovascular system by raising your body temperature and increasing blood flow to your muscles. Warming up also helps reduce muscle soreness and it lessens your risk of injury. Cooling down after your workout allows for a gradual recovery of pre exercise heart rate and blood pressure.
If there is a 0.10 kg sample of the unknown metal alloy originally at 150℃, that is placed in 1.0 kg water at 20℃, and the final temperature rises to 23.5 ℃, what is the specific heat capacity?
Specific Heat of Water: 4180 J/kg ℃
Answer:
We now introduce two concepts useful in describing heat flow and temperature change. The heat capacity ( C ) of a body of matter is the quantity of heat ( q ) it absorbs or releases when it experiences a temperature change ( ΔT ) of 1 degree Celsius (or equivalently, 1 kelvin)
C=qΔT(12.3.1)
Heat capacity is determined by both the type and amount of substance that absorbs or releases heat. It is therefore an extensive property—its value is proportional to the amount of the substance.
For example, consider the heat capacities of two cast iron frying pans. The heat capacity of the large pan is five times greater than that of the small pan because, although both are made of the same material, the mass of the large pan is five times greater than the mass of the small pan. More mass means more atoms are present in the larger pan, so it takes more energy to make all of those atoms vibrate faster. The heat capacity of the small cast iron frying pan is found by observing that it takes 18,140 J of energy to raise the temperature of the pan by 50.0 °C
Explanation:
PLEASE HELP! ASAP
During which process is radiation given off by isotopes with unstable atomic
nuclei?
A. Nuclear fusion
B. Chemical decay
C. Radioactive decay
D. Nuclear fission
Answer:
C. Radioactive decay
Explanation:
Answer:
Radioactive Decay
Explanation:
Ap3x
what are fission write its type
Answer:
In nuclear physics and nuclear chemistry, nuclear fission is a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into two or more smaller, lighter nuclei. ... Fission is a form of nuclear transmutation because the resulting fragments are not the same element as the original atom.
Explanation:
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How much must a man weigh (force) if the pressure he exerts while standing on one foot which has an area of 25 m^2 exerts a pressure of 5 pa?
Answer:
Weight, W = 125 N
Explanation:
Pressure, P = 5 Pa
Area, A = 25 m²
We need to find how much must a man weigh (force) if the pressure he exerts while standing on one foot which has an area of 25 m² exerts a pressure of 5 Pa. So,
Pressure = force/area
So,
[tex]F=P\times A\\\\F=5\times 25\\F=125\ N[/tex]
So, the weight of the man is 125 N.
Hernando builds a simple DC series circuit with a standard D-cell battery and uses an ammeter to determine that the total current in the system is 3.0 A. In an attempt to increase the brightness of the bulbs in the circuit, he tries to increase the voltage by adding two more batteries (in series with the first). Calculate the new current when driven by three batteries.
Answer: I = 9.0 A
Explanation: Ohm's Law is defined as the relationship between voltage and current: in a circuit, the voltage accross a conductor is directly proportional to the current.
The constant of proportionality is Resistance, whose unit is ohm (Ω).
so, Ohm's Law is
V = R.I
It is asked for the current, so, rearraging:
[tex]I=\frac{V}{R}[/tex]
When added two more batteries, the voltage of the circuit triples:
[tex]V_{final}=3V_{initial}[/tex]
Since they are directly proportional, if voltage triples, so does current:
[tex]I_{final}=3I_{initial}[/tex]
[tex]I_{final}=3(3.0)[/tex]
[tex]I_{final}=[/tex] 9.0
The new current, when driven by 3 batteries is 9.0 A.
A student pulls down with a force of 40 N on a rope that winds around a pulley of radius 5 cm. find the torque?
Answer:
2N
Explanation:
Given that a student pulls down with a force of 40 N on a rope that winds around a pulley of radius 5 cm. find the torque?
Solution
Using the formula
Torque = Force × radius
I.e
Torque = F r
Where
F = 40N
r = 5 cm = 5/100 = 0.05m
Substitute all the parameters into the formula
Torque = 40 × 0.05
Torque = 2 N
Therefore, the torque on this scenario is 2 N
A 4 N weight is hung from a spring causing it to
stretch a distance of 0.16 m. What is the
spring constant?
Answer:
0.25 N/m
Explanation:
F = 4 N
x = 0.16 m
Plug those values into Hooke's Law:
F = kx
4 N = k(0.16 m)
---> k = 0.25 N/m
What is the equation for frequency?
Answer:
f=1/t is the equation of frqency
A person weighing 645 N climbs up a ladder to a height of 4.55 m what is the increase in gravitational energy
Answer: 2934.75 Joules
Explanation:
Potential energy can be defined as energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
P.E = mgh
Where P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per second square.
h represents the height measured in meters.
Given the following data;
Weight =645
Height = 4.55
P.E = mgh
But we know that weight = mg = 645N
Substituting into the equation, we have;
P.E = 645 • 4.55
P.E = 2934.75J
Potential energy, P.E = 2934.75 Joules.
Two 31-m long parallel wires are 0.155 m apart. Each carries 168 A of current. What is the magnitude of the force between the wires? Please give your answer in Newtons.
Answer:
The magnitude of magnetic force between the two parallel wires is 1.13 N.
Explanation:
Given;
length of each wire, l = 31 m
distance between the two parallel wires, r = 0.155 m
current on each wire, I = 168 A
The magnitude of magnetic force between the two parallel wires is calculated as;
[tex]F = \frac{\mu _oI_1I_2 L}{2\pi r} \\\\F = \frac{(4\pi \times 10^{-7}) \times (168)^2 \times (31)}{2\pi \times 0.155} \\\\F = 1.13 \ N[/tex]
Therefore, the magnitude of magnetic force between the two parallel wires is 1.13 N.
You rubbed two identical balloons in your hair's friend. This causes the balloons to become charged negatively with a magnitude of 2.5 x 10^-6 C. If they are held 0.5 cm apart, (a) What is the electric force between the two balloons? (b) It is a repulsive or attractive force? Why?
Answer:
a) F = 2.25 10³ N, b) REPULSIVE.
Explanation:
a) The electric force is given by coulomb's law
F = [tex]k \frac{q_1q_2}{r^2}[/tex]k q1q2 / r2
in this case nso indicate that the two charges have the same value
q₁ = q₂ = 2.5 10⁻⁶ C
Let's reduce the magnitudes to the SI system
r = 0.5 cm (1m / 100cm) = 5 10⁻³ m
let's calculate
F = [tex]9 \ 10^9 \frac{(2.5 \ 10^{-6})^2 }{(5 \ 10^{-3})^2}[/tex]
F = 2.25 10³ N
b) In electricity, electric charges of the same sign repel and those of the opposite sign attract
In this exercise, the balls are equal and are rubbed with the same material, for which it acquires charges of the same type, consequently, as the charges are of the same type, they indicate that the negative force is REPULSIVE.
An athlete whirls a 7.00 kg hammer 1.8 m from the axis of rotation in a horizontal circle, as
shown in the figure below. The hammer makes one revolution in 1.0 s. What is the tension in
the chain?
A-500 N
B-50 N
C-5000 N
D-5 N
Answer:
A-500 N
Explanation:
The computation of the tension in the chain is shown below
As we know that
F = ma
where
F denotes force
m denotes mass = 7
And, a denotes acceleration
Now for the acceleration we have to do the following calculations
The speed (v) of the hammer is
v = Angular speed × radius
where,
Angular seed = 2 × π ÷ Time Period
So, v = 2 × π × r ÷ P
v = 2 × 3.14 × 1.8 ÷ 1
= 11.304 m/s
Now
a = v^2 ÷ r
= 70.98912 m/s^2
Now the tension is
T = F = m × a
= 7 × 70.98912
= 496.92384 N
= 500 N
THIS IS URGENT !!!
Four students recorded the time it took them to walk to school from their
homes as shown in the tabel below.
Motion of Four Students
Student
Which student had the greatest average speed?
Student 1
Student 2
Student 3
Student 4
I’LL MARK BRAINLIST!!!
What does ADA apply to?
NEED HELP ASAP!!!!!!!!!!
Answer:
*The same balloon put into the freezer would be smaller and shriveled.
* The volume decreases as the temperature decreases.
* using a hypothetical starting volume of 2 liters in the balloon at 42 degrees Celsius, we can use the equation V1/T1 =V2/T2
V2= 1.54 liters which proves when temperature decreases , volume decreases as well.
Explanation:
The volume increases as the temperature increases, and volume decreases as the temperature decreases.
using a hypothetical starting volume of 2 liters in the balloon at 42 degrees Celsius, we can use the equation V1/T1 =V2/T2
Change Celsius to kelvin by adding 273.
2 liters/ 315 K = V2/243 K
Cross multiply and then divide by 315 to find V2
2 liters x 243 K / 315 K = V2
The Kelvin cancels itself out.
486 liters /315=V2
V2= 1.54 liters.
This proves that when the temperature decreases , so does the volume.
Oxygen makes up more than 90 percent of the volume of the Earth's crust. Is oxygen found as a solid, liquid, or gas?
Answer:
Oxygen is an element that can be a solid, liquid or gas depending on its temperature and pressure. In the atmosphere it is found as a gas, more specifically, a diatomic gas. This means that two oxygen atoms are connected together in a covalent double bond.
Did I do this right??
Answer:
yes
Explanation:
good job
What is the gravitational potential energy of a 0.550-kg projectile flying with 335 m/s, 72 meters above the ground?
Answer:
GPE = 388.08 Joules.
Explanation:
Given the following data;
Mass = 0.550kg
Speed = 335 m/s
Height = 72 meters
We know that acceleration due to gravity, g is equal to 9.8 m/s²
To find the gravitational potential energy;
Gravitational potential energy (GPE) is an energy possessed by an object or body due to its position above the earth.
Mathematically, gravitational potential energy is given by the formula;
[tex] G.P.E = mgh[/tex]
Where;
G.P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
Substituting into the formula, we have;
[tex] G.P.E = 0.550 * 9.8 * 72[/tex]
GPE = 388.08 Joules.
How does quantum theory explain the emission spectra of atoms
A. Electrons slowly gain energy in a continuous fashion
B. The movement of an electron between energy levels occurs gradually a small amount of energy are absorbed
C. Each motion of an electron between energy levels is associated with a single, specific amount of energy
D. Electrons absorb the energy they need to jump to a higher energy level from any light source above a minimum energy
Answer:
C
Explanation:
Each motion of an electron between energy levels is associated with a single, specific amount of energy
PLESS HELP!!! 30 points this is language arts
Read the excerpt from A Black Hole is NOT a Hole.
However, near a black hole, gases and dust and stars encounter its tug. Some things may be hurtling by so fast they won't get pulled into the black hole. Other things may not be as swift. They will be drawn in.
Closer and closer, the tugging force gets stronger and stronger. Close enough, the black hole no longer acts like a whirlpool.
With a whirlpool, there's always a fast-enough fish—or a fast-enough something—that moves so quickly it won't be pulled all the way into the center.
Not so with a black hole! Within a certain distance the black hole's power is so strong, nothing is fast enough to zip away.
What is being compared or contrasted in this excerpt?
A. A comparison between the power of a star and the power of a whirlpool is being made.
B. A contrast between the power of a star and the power of a whirlpool is being made.
C. A comparison between the power of a black hole and the power of a whirlpool is being made.
D. A contrast between the power of a black hole and the power of a whirlpool is being made.
Answer:
D. A contrast between the power of a black hole and the power of a whirlpool is being made.
Answer:
D
Explanation:
I have to finish this by 6 am today please somebody help me
A block of mass m is attached to ideal spring of constant k. When the spring is neither stretched nor compressed, block is at the
equilibrium position (x-0).
Assume the force between the mass and the spring obeys Hooke's Law: Fs-kx, where x is the displacement and Fs is the
restoring force. The restoring force is always directed toward the equilibrium position. In this example of vibrational motion, the
restoring force illustrates Newton's
A. first law of motion
B. 2nd law of motion
C. 3rd law of motion
D. law of gravitational attraction
Answer: Newton’s Third Law of Motion
Explanation:
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How many joules
of energy is needed
to run a 600 watt
power drill for
5 minutes?
Answer:
180KJ
Explanation:
power=Energy/time
power=600watts, time=5minutes=60*5=300 seconds
therefore;Energy=power*time= 600* 300
=180,000joules
OR
180Kilojoules
Which statement explains how ocean currents affect climate?(1 point)
Ocean currents change the temperature of air masses. Cold ocean currents transport heat from the equator to the poles.
Ocean currents change the temperature of landmasses. Cold ocean currents transport heat from the equator to the poles.
Ocean currents change the temperature of air masses. Warm ocean currents transport heat from the equator to the poles.
Ocean currents change the temperature of landmasses. Warm ocean currents transport heat from the equator to the poles.
Answer:
C
Explanation:
Warm water and precipitation are transported from the equator to the poles by ocean currents, whereas cold water is returned to the tropics from the poles. Ocean currents control climate globally by balancing out the uneven distribution of solar radiation that reaches Earth's surface.
What Ocean currents, the temperature of landmasses?Short-distance currents can travel across entire ocean basins, while longer ones can even circle the earth. Ocean currents are vital in regulating the climate because they transport heat from the equator to the poles.
The distribution of air temperature is significantly influenced by ocean circulation. The warm Gulf Stream in the North Atlantic and the chilly Peru (Humboldt) Current in South America are two examples of ocean currents with a northward or southbound component that efficiently exchange heat between low and high latitudes.
Learn more about ocean Current here:
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