Liquid water is nearly 1,000 times denser than air. Thus, for every 32.0 feet (9.75 m) a scuba diver descends below the water's surface, the pressure increases by 1.00 atm. Human lungs have a volume of approximately 3.50 L. If a scuba diver descends to a depth of 80.0 feet where the pressure is 3.50 atm (2.50 atm from the water and 1.00 atm from the air pressure), then by how much does the volume of a 3.50 L surface sample of air decrease
Answer:
ΔV = -2.1 L
Explanation:
To solve this exercise we can use the ideal gas equation for two points
PV = nRT
P₁V₁ = P₂ V₂
where point 1 is on the surface and point 2 is at the desired depth,
V₂ = [tex]\frac{P_1}{P_2} \ V_1[/tex]
let's calculate
V₂ = ( [tex]\frac{1 atm}{2.5 atm}[/tex] ) 3.5 L
V₂ = 1.4 L
this is the new volume, the change in volume is
ΔV = V₂ -V₁
ΔV = 1.4-3.5
ΔV = -2.1 L
An increase in the magnitude of which others quantities causes a reduction in centripetal force?
A. Mass
B.Radius of curvature
C. Velocity
Answer:
F = M v^2 / R = M w^2 R where w represents the angular frequency
Only 1 / R causes a reduction in centripetal force when increased
(B) is the answer
Option B. The radius of curvature causes a reduction in centripetal force with an increase in the magnitude.
Centripetal force is a force that acts on the object that moves in a circular motion and is directed towards the center of the circular moving path. The mathematical representation of centripetal force is -
[tex]F_{c} = \frac{mv^{2} }{r}[/tex],Where Fc = the centripetal force,
m = mass of the object,
v = velocity
and r = radius.
From the given explanation above, The centripetal force and radius of curvature are inversely proportional to each other,
that is, Fc = 1/r.
Therefore, an increase in the radius of curvature leads to a reduction in the centripetal force.
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Peron Company uses a perpetual inventory system and the net method of recording invoices. The company purchased merchandise on November 4 at a $2,000 invoice price with terms of 2/10, n/30.
Answer: See explanation
Explanation:
From the information given in the question, the journal entry is written below:
Debit: Merchandise inventory 1960
Credit: Account payable 1960
(To record purchase)
Note that 1960 was gotten as:
= 2000 × 98%
= 2000 × 0.98
= 1960
Note that 2% discount was given.
A stack of books whose true weight is 165 N is placed on a scale in an elevator. The scale reads 165 N. From this information alone, can you tell whether the elevator is moving with a constant velocity of 2 m/s upward, is moving with a constant velocity of 2 m/s downward, or is at rest
Explanation:
Given
The true weight of books is [tex]165\ N[/tex]
Weight measured in the elevator is also [tex]165\ N[/tex]
True weight=measured weight
Therefore, we can say that elevator is not accelerating
Had the lift is accelerating upwards, the measured weight would be more than the true weight.
Thus, it cannot be said with certainity that the lift is moving upward, downward, or at rest.
what specific heat of water explains why the climate doesn't vary much with season in places near large body water
Answer:
The specific heat of water is greater than that of dry soil, therefore water both absorbs and releases heat more slowly than land. ... This causes land areas to heat more rapidly and to higher temperatures and also cool more rapidly and to lower temperatures, compared to oceans.
Explanation:
Which property is not commonly used to identify minerals?
A)
luster
B)
texture
hardness
D)
crystal form
Answer:hardness
Explanation: I’m smart like dhet
Answer:
Luster
Explanation:
Hardness is very important for seperating rocks and minerals.
However, Luster is not as common, nor on many questions.
Which physical law most directly describes the motions of objects that are acted on by forces?
A.
Newton's law of universal gravitation
B.
Newton's second law of motion
C.
Coulomb's law of electrostatic interaction
D.
the conservation of mass law
Answer: Newton's second law of motion
Explanation:
In Spanish, count to 1000 in hundreds. (100, 200, 300, 400…1000) You will be graded on (a) pronunciation and (b) correct number vocabulary.
Choose all true statements Choose all true statements Resistors connected in parallel will always have the same potential difference across all of them. When combining multiple resistors in series, the equivalent resistance is less than any of the individual resistanes. Resistors connected in series will always have the same current flowing through all of them. Resistors connected in series will always have the same potential difference across all of them. Resistors connected in parallel will always have the same current flowing through all of them. When combining multiple resistors in parallel, the equivalent resistance is less than any of the individual resistanes.
Answer:
The answer is " Option F, Option C, and Option D".
Explanation:
In the question the three choices were correct which can be defined as follows:
Its equivalent resistance is below any load resistors while integrating multiple resistors in parallel.The connected sequence resistances will still have the same fluid power.Simultaneously connected resistances will always have the same electrical potential between them at all.How is biochar produced?
Answer:
Biochar is produced by heating biomass in the total or partial absence of oxygen. Pyrolysis is the most common technology employed to produce biochar, and also occurs in the early stages of the combustion and gasification processes. Besides biochar, bio-oil and gas can be collected from modern pyrolysers.
Learning Task 2:
Match the Richter magnitude indicated in column A with the
earthquake effect found in column B. Write your answer on the space provided.
NEED TONIGNT SANA MAY TUMULONG
Answer:
Hello your question has some missing parts attached below is the missing part
Answer :
Caused severe damage ( 7 ) ----- EFurniture moves ( 5 ) -------- GMay not be felt ( 2 ) ---------- FFelt by most people ( 4 ) --------- Dwidespread destruction ( 8 up ) ------ Blead to a lot of damage ( 6 ) -------- AFelt little by people ( 3 ) ---------- CExplanation:
Matching the Richter magnitude indicated in column A with the Earthquake effect found in column B
Caused severe damage ( 7 ) ----- EFurniture moves ( 5 ) -------- GMay not be felt ( 2 ) ---------- FFelt by most people ( 4 ) --------- Dwidespread destruction ( 8 up ) ------ Blead to a lot of damage ( 6 ) -------- AFelt little by people ( 3 ) ---------- C
Your dog runs in a straight line for a distance of 43m in 28s
What is your dog's average speed?
Answer:
Explanation:
Hope this helps!
The standing vertical jump is a good test of an athlete's strength and fitness. The athlete goes into a deep crouch, then extends theirlegs rapidly; when theirlegs are fully extended, theyleave the ground and rise to theirhighest height.It is the force of the ground on the athlete during the extension phase that accelerates the athlete to the final speed with which theyleave the ground.A good jumper can exert a force on the ground equal to twice theirweight. If thecrouch is 65 cm deep, how far off the ground do theyrise
Answer:
h = 1.3 m
Explanation:
For this exercise we can use the relationship between work and kinetic energy
W = Δx = K_f - K₀
in the exercise they indicate that the strength of the athlete is over twice his weight, therefore the ratio of the floor directed upwards has the same value
F = 2W
F = 2 mg
the displacement is x = 0.65 m, note that the direction of the force and the displacement is the same and the initial velocity is zero due to being crouched at rest, we substitute
F x = ½ m v² - 0
v² = 2 (2mg) x / m
v = [tex]\sqrt{4gx}[/tex]
let's calculate
v = [tex]\sqrt{ 4 \ 9.8 \ 0.65}[/tex]
v = 5.05 m / s
already in the air energy is conserved
starting point. Just when it comes off the ground
Em₀ = K = ½ m v²
final point. When is it at the highest part of the trajectory
Em_f = U = m g h
Em₀ = Em_f
½ m v² = m g h
h = ½ [tex]\frac{v^2}{g}[/tex]
let's calculate
h = ½ 5.05²/9.8
h = 1.3 m
There are three main types of nerve fibers that carry neural signals from pain receptors to the spinal cord.
Please select the best answer from the choices provided
T
F
Answer:
true is the answer
ok false is wrong
Answer:
Not sure, but I think its T
Explanation:
Lex launched a golfball with his lego catapult. It traveled 7 meters and was in the air for 2 seconds. Please determine the object’s maximum height, horizontal velocity, vertical velocity, actual velocity, and time it reached its maximum height. The angle of release (the catapult’s arm) is 40°.
Horizontal Velocity = vx
Vertical Velocity = V1y
Actual Velocity: V1 = Vactual
Time reached highest point
Height reached!= h
Givens:
dx=
a=
t=
Angle of release:
Table B:
What you need to determine
Formula used
Answer: remember to label the correct units
Distance
Measure it with a meter stick
Time Traveled
Measure it with a stopwatch
Horizontal Velocity
Vertical Velocity
Actual Velocity
Time reached Highest Point
What was the object’s highest point
Answer:
Explanation:
Range R = 7 m
angle of projection θ = 40⁰
u² sin2θ / g = R where u is velocity of throw.
u² sin 80 / g = 7
u² = 69.71
u = 8.35 m/s
horizontal velocity = u cos 40 = 8.35 cos 40
= 6.4 m /s
vertical velocity = u sin 40 = 8.35 sin40
= 5.37 m /s
Maximum height :-
v² = u² - 2gh , u is initial vertical component of throw.
0 = 5.37² - 2 x 9.8 x h
h = 1.47 m
Time to reach max height :--
v = u - gt
o = 5.37 - 9.8 t
t = .55 s
In the following problems, assume the following parameters:
Mass of the bottom steel disc: 1.468 kg.
Mass of the upper steel disc: 1.479 kg.
Mass of the upper aluminum disc: 0.461 kg.
Radius of each disc: 63.3 mm.
Radius of the take-up spool: r= 1.25 cm.
Mass of the falling weight: 25 grams.1.
1. Using the values given above, calculate the following:
a. The moment of inertia of the lower, steel disc.
b. The moment of inertia of the upper, steel disc.
c. The moment of inertia of the upper, aluminum disc.
d. The combined moment of inertia of the two steel discs.
2. Using the results of problem 1, what percentage error is made by neglecting mr2with respect to Iin equation (95)?
3. Suppose that the counter is reading 400 counts per second at some moment. What is the value of Ïat that moment?
Answer:
1) a) I₁ = 0.2941 kg m², b) I₂ = 0.2963 kg m², c) I_{total} = 0.5904 kg m²
3) α = 6.31 10⁶ rad / s²
Explanation:
1) The moment of inertia for bodies with high symmetry is tabulated, for a divo with an axis passing through its center is
I = ½ m r²
a) moment of inertia of the upper disk
I₁ = ½ m₁ r₁²
I₁ = ½ 1,468 0.633²
I₁ = 0.2941 kg m²
b) upper aluminum disc moment of inertia
I₂ = ½ m₂ r₂²
I₂ = ½ 1.479 0.633²
I₂ = 0.2963 kg m²
c) the moment of inertia is an additive scalar quantity therefore
I_{total} = I₁ + I₂
I_{total} = 0.2941 + 0.2963
I_{total} = 0.5904 kg m²
3) ask the value of the angular acceleration, that is, the second derivative of the angle with respect to time squared
indicate the angular velocity of the system w = 400 rev / s
Let's reduce the SI system
w = 400 rev / s (2π rad / rev) = 2513.27 rad / s
as the system is rotating we can calculate the centripetal acceleration
a = w² R
a = 2513.27² 0.633
a = 3.998 10⁶ m / s²
the linear and angular variable are related
a = α r
α = a / r
α = 3.998 10⁶ / 0.633
α = 6.31 10⁶ rad / s²
Two resistors ( 3 ohms & 6 ohms) in a series circuit with a power supply = 12 volts. The current through resistor 6 ohms is :
a.
1.33 A
b.
2.66 A
c.
12 A
In a series circuit . . .
-- The total resistance is the sum of the individual resistors.
-- The current is the same at every point in the circuit.
The total resistance in this circuit is (3Ω + 6Ω ) = 9Ω
The current at every point is (V/R) = (12v / 9Ω ) = 1.33 A .
Pick choice (a).
The current flowing through the 6 Ohms resistor is: a. 1.33 A
Given the following data:
Resistor A = 3 Ohms.Resistor B = 6 Ohms.Voltage = 12 Volts.To find the current flowing through the 6 Ohms resistor:
First of all, we would determine the total equivalent resistance of the resistors connected in series.
[tex]T_eq = Resistor \; A + Resistor\; B\\\\T_eq = 3 + 6[/tex]
Total equivalent resistance = 9 Ohms
Note: The current flowing through both resistors are the same since they are connected in series.
From Ohm's law, we have:
[tex]Current = \frac{Voltage}{Resistor}\\\\Current = \frac{12}{9}[/tex]
Current = 1.33 Amperes
Therefore, the current flowing through the 6 Ohms resistor is 1.33 Amperes.
When heat travels between two objects that are touching, it is moving by ________
radiation
convection
conduction
none of the above
When heat travels between two objects that are touching,
it is moving by conduction.
How much heat is needed to warm 0.052 kg of gold from 30C to 120C
Answer:
90 degrees Celsius
Explanation:
120-30 = 90
A 0.73-m aluminum bar is held with its length parallel to the east-west direction and dropped from a bridge. Just before the bar hits the river below, its speed is 20 m/s, and the emf induced across its length is 7.9 x 10-4 V. Assuming the horizontal component of the Earth's magnetic field at the location of the bar points directly north, (a) determine the magnitude of the horizontal component of the Earth's magnetic field, and (b) state whether the east end or the west end of the bar is positive.
Answer:
A) B = 5.4 10⁻⁵ T, B) the positive side of the bar is to the West
Explanation:
A) For this exercise we must use the expression of Faraday's law for a moving body
fem = [tex]- \frac{d \phi }{dt}[/tex]
fem = [tex]- \frac{d (B l y}{dt}= - B l v[/tex]- d (B l y) / dt = - B lv
B = [tex]- \frac{fem}{l \ v}[/tex]
we calculate
B = - 7.9 10⁻⁴ /(0.73 20)
B = 5.4 10⁻⁵ T
B) to determine which side of the bar is positive, we must use the right hand rule
the thumb points in the direction of the rod movement to the south, the magnetic field points in the horizontal direction and the rod is in the east-west direction.
Therefore the force points in the direction perpendicular to the velocity and the magnetic field is in the east direction; therefore the positive side of the bar is to the West
Fill in the blank. Consider the inverse square law: When light leaves a light bulb, it spreads out over more and more space as it goes. This makes the light thinner, with less and less light present the further from the light bulb we look. If we stand looking at a light bulb and see how bright it is, then move to be four times farther away from the light bulb, the light from the bulb will look ____________ less bright. Group of answer choices
Answer:
Explanation:
Intensity of light is inversely proportional to distance from source
I ∝ 1 /r² where I is intensity and r is distance from source . If I₁ and I₂ be intensity at distance r₁ and r₂ .
I₁ /I₂ = r₂² /r₁²
If r₂ = 4r₁ ( given )
I₁ / I₂ = (4r₁ )² / r₁²
= 16 r₁² / r₁²
I₁ / I₂ = 16
I₂ = I₁ / 16
So intensity will become 16 times less bright .
"16 times " is the answer .
What is the momentum of a compact car that is 750 kg and is travelling 30 m/s?
The momentum of a compact car that is 750 kg and is travelling 30 m/s be 22500 N-s.
What is momentum?The relationship between a particle's mass and velocity is called momentum. Being a vector quantity, momentum possesses both magnitude and direction. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate of change of momentum.
Given parameters:
Mass of the compact car: m = 750 kg.
Speed of the car: v = 30 m/s.
Hence, magnitude of momentum of the car is = mv
= 750×30 N-s
= 22500 N-s.
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On a sunny day, heat moves from the hot pavement to your feet through the process of __________
convection
conduction
insulation
radiation
plsssssss answer correct answers only i put 15 points
da answer z da first option convection
Which of the following statements is true?
Answer:
Aluminum and steel are good conductors of electricity.
Explanation:
1) All materials are good conductors of electricity.
This is false because nonmetal materials such as plastic or wood cannot conduct electricity.
2) Aluminum and steel are good conductors of electricity.
This is true. All metals are conductors of electricity.
3) Gold and wood are poor conductors of electricity.
This is false. Although gold can conduct electricity, wood can't.
4) Plastic and copper are good conductors of electricity.
This is false. Although copper can conduct electricity, plastic can't.
I hope this helps!
Answer:
B) Aluminum and steel are good conductors
Explanation:
A vibration platform oscillates up and down with a fixed amplitude of 9.7 cm and a controlled frequency that can be varied. If a small rock of unknown mass is placed on the platform, at what frequency will the rock just begin to leave the surface so that it starts to clatter?
Answer:
1.6 Hz
Explanation:
In simple harmonic motion, acceleration is given by the formula;
a = Aω²
Where;
A is amplitude
ω is angular velocity.
We are given A = 9.7 cm = 0.097 m
We know that acceleration due to gravity is 9.8 m/s².
Thus;
9.8 = 0.097ω²
ω² = 9.8/0.097
ω = √101.031
ω = 10.05 rad/s
Formula for frequency is;
f = ω/2π
Thus;
f = 10.05/2π
f = 1.6 Hz
What is a fuel?
something that you rub to make heat
something that can be burned to produce heat
a kind of electricity
anything that makes heat
plssssss answer correctly
Answer:
something that can be burned to produce heat
Explanation:
Combustion can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.
A fuel can be defined as something that can be burned to produce heat.
In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.
i need this literally asap
which of these statements are true?
1. it is always correct to use a 3 Amp fuse.
2. Fuses come in several different sizes and values
3. A fuse can be re-set and used again
4. A fuse once ‘blown’ needs replacing
5. Fuses are the ‘weak point’ in a circuit
Answer:
I only know number 4 is correct
Explanation:
Difference between on pitch and frequency
Answer:
A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave. I hope I got it correct !!
A body having mass 200g id moving with velocity 120m\s. What is its power
Answer:
P = 24 watts
Explanation:
Given that,
Mass, m = 200 g = 0.2 kg
Velocity of the body, v = 120 m/s
We need to find the power of the body. The formula for power is given by :
P = Fv
Here, F = W (weight) i.e. mg
So,
P = 0.2 × 120
P = 24 Watts
So, the power of the body is 24 watts.
Choose the correct statement below about the interaction between magnets, magnetic materials and charges.
a) The south magnetic pole repels the north pole of another magnet.
b) The south magnetic pole attracts the north pole of another magnet.
c) A magnetic material that has not been made into a magnet is not attracted to either the north and south pole of a magnet.
d) The north magnet pole attracts the north magnetic pole of another magnet.
e) The south magnetic pole attracts the south magnetic pole of another magnet.
Answer: B. The south magnetic pole attracts the north pole of another magnet.
Explanation:
The correct statement below about the interaction between magnets, magnetic materials and charges is that the south magnetic pole attracts the north pole of another magnet.
We should note that a magnet typically consists of two poles which are the North Pole and the South pole. The opposite poles doesn't repel each other but attracts each other while same pole repels one another.
In this case, the North Pole will attract the South Pole while same magnetic piles repel e.g the North Pole will repel the North Pole.