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.
How can inclined planes change the amount of force to move an object? A. Increase height of the inclined plane B. Increase distance of the inclined plane C. Use a wooden inclined plane instead of a metal one D. None of the above
Answer:
Option ( B ) is correct .
Explanation:
To lift a heavy weight , inclined plane is used . Use of inclined plane , makes the task easier because instead of force mg , force mg sinθ is to be used which is less than mg . Here θ is inclination of inclined plane.
If h be the height by which weight is to be lifted
potential energy acquired by weight = mgh
work done by force mg sinθ = mgsinθ x d where d is displacement required .
mg sinθ x d = mgh ( work done by force = potential energy stored in luggage )
d = h / sinθ
d will be more than h
Hence inclined plane increases the distance to be covered by force applied though it decreases the force itself.
Hence option ( B ) is correct .
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.
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.
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) :)
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 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.
23.
A board for a shelf is 2.31 m long and 33.4 cm wide. to. What is the area of the shelf in square meters? b. What is the perimeter of the shelf in centimeters? c. Which will reduce the area of the shelf more: (1) cutting 3.4 cm from its width, or (2) cutting 0.31 m from its length?
Answer:
1 m = 100 cm....so 2.5 m = (2.5 * 100) = 250 cm
a = 1st shelf
b = 2nd
c = 3rd
d = 4th
a + b + c + d = 250
b = 2a + 18
c = a - 12
d = a + 4
a + (2a + 18) + (a - 12) + (a + 4) = 250
5a + 10 = 250
5a = 250 - 10
5a = 240
a = 240/5
a = 48 cm <== 1st shelf
b = 2a + 18 = 2(48) + 18 = 114 cm <== 2nd shelf
c = a - 12 = 48 - 12 = 36 cm <== 3rd shelf
d = a + 4 = 48 + 4 = 52 cm <== 4th shelf
so 2nd shelf is 114 cm
To prevent injuries you should do a warm up and cool down.
True or False
Answer:
true
hope my ans helps
plz give brainliest to my answer
be sure to follow me
stay safe
have a good day
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.
What is your favorite thing to eat? is it healthy or unhealthy ?
Answer:
sometimes I like to eat unhealthy and healthy my healthy are fruits granola a grapes, strawberries, blueberries or make smoothie out fruits my unhealthy is pizza, streak fries, with everything on the side. so ways eaanation:
A plane loaded with cargo travels 2000 miles at an average speed of 400 Miles per hour. On the return trip on the same route it travels at an average speed of 480 miles per hour. How much quicker was the return trip
Answer:
Difference = 1.83 hours
Explanation:
Let the two trips be A and B respectively.
Given the following data;
Distance A = 2000 miles
Speed A = 400 miles
Distance B = 2000 miles
Speed B = 480 miles per hour
To find the time spent;
a. For trip A.
Time A = distance A/speed A
Time A = 2000/400
Time A = 5 hours
b. For trip B.
Time B = distance B/speed B
Time B = 2000/480
Time B = 4.17 hours
Next, we would find the difference between the two trips.
Difference = Time A - Time B
Difference = 5 - 4.17
Difference = 1.83 hours
Therefore, the return trip was much quicker by 1.83 hours.
The return trip of the airplane will be quicker by 1.84 hours
What will be the time taken by the airplane on the second trip?It is given that
Distance covered by the plane D= 2000 miles
The average speed of the plane
[tex]V_1=400\ \frac{Miles }{hour }[/tex]
The Return Average speed of the plane
[tex]V_2= 480\ \frac{Miles}{hour}[/tex]
Now we will first find the time taken by the airplane during the first visit.
[tex]V_1=\dfrac{Distance }{Time }[/tex]
[tex]Time = \dfrac{Distance }{V_1}[/tex]
Now by putting the values in the formula
[tex]T_1=\dfrac{2000}{400} =5\ hours[/tex]
Now for the return trip time taken by the plane
[tex]T_2=\dfrac{Distance }{V_2}[/tex]
[tex]T_2= \dfrac{2000}{480}[/tex]
[tex]T_2= 4.16\ hours[/tex]
Now the difference between the time will be
[tex]=T_1-T_2=5-4.16=0.86=1.84 \ Hours[/tex]
Thus the return trip of the airplane will be quicker by 1.84 hours
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HELP PLZ HELP !!!!!!!!!!!
Answer:
From least to greatest: Neon, Sodium, Silicon, Iron, Uranium
Explanation:
Here are all the atomic numbers for each one:
Iron = 26
Sodium = 11
Uranium = 92
Neon = 10
Silicon = 14
Hope this helps! :D
The Pasig Revolving Tower has an estimated height of 45.23 meters. How high is it in yard?
Answer:
50.26
I hope its help
Thank you
hypsometer (upper fixed point
Answer:a device for calibrating thermometers at the boiling point of water at a known height above sea level or for estimating height above sea level by finding the temperature at which water boils.
Explanation:
If a 20 g cannonball is shot from a 5 kg cannon with a velocity of 100
m/s, then the speed of recoil of the cannon is -0.4 m/s.
true or false?
Strange as it may seem, the statement in the question appears to be TRUE.
-- Before the shot, neither the cannon nor the ball is moving, so their combined momentum is zero.
-- Since momentum is conserved, we know immediately that their combined momentum AFTER the shot also has to be zero.
-- (20g is rather puny for a "cannonball" ... about the same weight as four nickels. But we'll take your word for it and just do the Math and the Physics.)
-- Momentum = (mass) x (velocity)
After the shot, the momentum of the cannonball is
(0.02 kg) x (100 m/s ==> that way)
Momentum of the ball = 2 kg-m/s ==> that way.
-- In order for both of them to add up to zero, the momentum of the cannon must be (2 kg-m/s this way <==) .
Momentum of cannon = (5 kg) x (V m/s this way <==)
2 kg-m/s this way <== = (5 kg) x (V m/s this way <==)
Divide each side by (5 kg):
V m/s = (2/5) m/s this way <==
Speed of recoil of the cannon = -- 0.4 m/s
Is this right?? please help me. IT IS SOCIOLOGY!!
Answer:
Yes, it is correct : )
Explanation:
Hope this helps!
Answer:
yes, this is correct.
Explanation:
After being stuck by a bowling ball, a 1.8 kg bowling pin slides to the right at 3.6 m/s and collides head-on with another 1.8 kg bowling pin initially at rest. What is the final velocity of the second pin if the first pin moves to the right at 0.54 m/s after the collision
Answer:
Explanation:
We shall apply law of conservation of momentum at the time of collision
Momentum before collision of both the pins = 1.8 x 3.6 + 0 = 6.48 kg m/s
Momentum after the collision of both the pins = 1.8 x .54 + 1.8 x v where v is velocity of second pin
So , according to law
6.48 = 1.8 x .54 + 1.8 x v
6.48 = .972 + 1.8 x v
v = 3.06 m /s to the right .
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:
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:
Plz mark brainliest thanks
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
air, water and salt solution are given in the table.
7. The different weights of a piece of stone on weighing in three media
Media
А
Weight
15N
20N
В.
C С
17N
i.
ii.
Among A, B and C identify water and salt solution.
If the weight of 1 kg mass in air is 10N , find out the mass of
a piece of stone.
Find out the mass of water displaced by the piece of stone,
iii.find out the mass of water displaced by the piece of stone,
Answer:
I need help
Explanation:
Albert tries to move a 200 N car and it moves 0 m. A tow truck tries to move the 200 N car and it moves 2 m off the ground onto the truck bed. Who put more work into moving the car? Explain your response using the space below. Be sure to show your calculations. *
What is the equation for frequency?
Answer:
f=1/t is the equation of frqency
is an electrical current which comes from a battery
which supplies a constant flow of electricity in one direction.
What is difference between continuous and discontinuous variations? Give examples for each of it
Answer:
Examples. Weight, height, and length of organisms are examples of continuous variation while the color of petals, blood groups of animals, the gender of animals, etc. are examples of discontinuous variation.
Explanation:
Hope it helps
A: screwdriver
B: Hamer
D: Saw
C: Axe
Answer:
a: a screwdriver
Explanation:
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
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.
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.
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When in use, a lamp is designed to draw
a current of 0.6 A from the car's 12 V battery. The resistance of
this lamp must be approximately...
Answer:
R=∆V/I=12/0.6=20ohm....
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.