Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth, she generates 60 J/kg worth of heat. What is the temperature increase? The mass of tissues warmed is only 0.100 kg, mostly in the palms and fingers, with c = 3500 J/kg 0C.

0.750 0C


0.257 0C


0.120 0C


0.171 0C

Based on the diagram, the correct statement is: Government and consumers make economic decisions in a mixed economy, while consumers make economic decisions in a market economy.

In a mixed economy, economic decisions are made by both the government and consumers.

The government plays a significant role in regulating and influencing economic activities through policies, regulations, and interventions.

In market economy, economic decisions are primarily made by consumers. The market forces of supply and demand dictate the allocation of resources, production levels, and pricing.

The freedom to buy and sell whatever they choose is what ultimately determines how commodities and services are produced and distributed.

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The stick and arm of a polo player together make a 2.5 m stiff segment. A motionless ball struck head-on has a resultant velocity of r=7.27 m/s.

The rate at which anything moves in a specific direction is known as its velocity. as the rate of a car driving north on such a highway or the pace at which a rocket takes off.

Velocity is a unit of measurement for motion that begins in one location and moves to another. There are countless practical uses for velocity, one one the most frequent ones is to estimate travel time, or how rapidly you will get from one place to another.

v=rω

where ω= the angular speed

r= the radius of the circle

v=1×2.5=2.5" " m/s

v=(2.5+5)m/s=7.5" " m/s

r=√(〖2.5)²+5²+2(2.5×5)cos⁡θ)]

r=√(〖2.5)²+5²+2(2.5×5)cos⁡30^0 )]

r=7.27m/s

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When ever there is a change in Velocity, there will be Acceleration. Let us now understand the concept of Acceleration with illustrative examples.

Let's suppose I have a car moving with a constant Velocity of 90 km along a straight line. It can be seen that the helicopter flying at roughly a speed of 20,000 km.

using the equation of motion formula;

S = ut + 1/2 + at²

Given,

S = 94 m

t = 5 sec

U = 0 initial velocity

S = ut + 1/2at²

94 = 0 + 1/2a 5²

a = (94 × 2)/ 25

Acceleration = 7.52 m/s²

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0.3 m/s was the original speed of the bullet.

m1v1=m2(v1+v2)

v1=m2(v1+v2)/m1

v1=4.9×0.6÷9.7

v1=0.3 m/s

Speed is a scalar variable that expresses how much an object's location changes over time or how much it changes per unit of time. It is frequently abbreviated as "s." The distance traveled by an object over a period of time divided by the length of the period gives the average speed of the object over that period.

The speed-related metrics are time divided by distance. The most prevalent unit of speed in daily life is the kilometer per hour (kph), while the SI unit of speed is the meter per second (m/s).

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The distance between a node and an adjacent antinode in the string is closest to 30 mm.

The fundamental frequency of the open pipe is given by:

f1 = v/2L

where v is the speed of sound in air and L is the length of the pipe. Substituting the given values, we get:

f1 = 345/(2 x 0.82)

= 210.97 Hz

The second overtone frequency of the pipe is 3 times the fundamental frequency:

f3 = 3f1 = 3 x 210.97

= 632.91 Hz

The frequency of the vibrating string is given by:

fs = n(v/2L)

where n is the harmonic number. Substituting the given values, we get:

fs = 5(345/2 x 0.15)

= 5750 Hz

The wavelength of the sound wave in the pipe that is in second overtone resonance is four times the length of the pipe:

λ = 4L = 4 x 0.82

= 3.28 m

The distance between a node and an adjacent antinode in the string is half of the wavelength of the vibrating string:

d = λ/2 = v/(2fs)

= 345/(2 x 5750)

= 0.03 m

= 30 mm

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The next most successful graft type and what is the source of killer t cells and macrophages energy. if Assuming that autografts and isografts are not possible.

CCR2− macrophages are largely derived from embryonic progenitors, including contributions from yolk sac macrophages, and are primarily autonomous from blood monocytes. energy, in physics, is the capacity to do work.  In contrast, resident cardiac CCR2+ macrophages are derived entirely from definitive HSCs and are replaced slowly by blood monocytes.

energy is the ability to do work. T cells and macrophages appear in the urine of patients with glomerulonephritis (GN), accompanied by active cellular infiltration such as cellular crescent formation and diffuse interstitial cell infiltration, but not in the urine of patients with GN without the active inflammatory lesions.

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Answer:

24.5secs

Explanation:

Given the following parameters

Acceleration a = 2m/s²

Final velocity v = 49m/s

Required

Time t

Using the equation of motion

v = u+at

49 = 0+2t

49 = 2t

t = 49/2

t = 24.5secs

It will take the trooper 24.5secs to overtake the car

Answer:

A force can speed up or slow down an object. A force can change the direction in which an object is moving. A bigger force on an object will produce a bigger change in the motion. A heavier object requires a larger force than a lighter object in order to undergo the same change in motion.

The relative permittivity of the insulator is εr = 1 / 2 = 0.5.

The relative permittivity of the insulator is calculated by applying the equation for the Coulomb force.

F = (kq²) / r²

where;

The initial force equation becomes;

3 = (kq²) / r²

Let's denote the relative permittivity as εr.

The new force equation becomes;

1.5 = (kq² x εr) / r²

Divide the two force equations;

(3 / 1.5) = (kq²) / (kq² x εr)

2 = 1 / εr

εr = 1/2 = 0.5

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Answer:

  0.83 g/cm³

Explanation:

The volume of the alcohol is ...

  (33.2 g)/(0.79 g/cm³) ≈ 42.0253 cm³

The density of water is about 1 g/cm³, so the volume of 9 g of it is ...

  (9 g)/(1 g/cm³) = 9 cm³

The total volume is ...

  42.0253 cm³ +9 cm³ = 51.0253 cm³

The total mass is ...

  33.2 g + 9 g = 42.4 g

So, the resulting density is ...

  (42.4 g)/(51.0253 cm³) ≈ 0.83 g/cm³

The resulting mixture has a density of about 0.83 g/cm³.

_____

Additional comment

Alcohol dissolves in water, so the total volume will be slightly less than 51.0253 cm³. The attached curve shows the result of mixing ethanol and water.

The weight of a mole of ethanol is about 46 g, of water, about 18.02 g. Then the mole fraction of alcohol is ...

  (33.2/46)/(33.2/46 +9/18.02) ≈ 0.59

The volume of the mix is then estimated to be (-1.05 cc/mol)(1.221 mol), or about 1.28 cm³ less than the volume indicated above. That brings the density up to about 0.85 g/cm³.

We're not completely sure of the relevance of this calculation, since many of the applicable parameters are not specified. The point is that the density of the mix will probably be slightly more than the value calculated above. YMMV

The mass of a substance is not directly related to latent heat. Instead, latent heat is a parameter that describes the amount of energy required or released during a phase shift of a substance.

Latent heat can be thought of as hidden energy that is supplied or extracted to change the state of a substance without changing its temperature or pressure.

Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process—typically a first-order phase transition.

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Answer:

the resultant wave is the algebraic sum of all the waves reaching that particular point at a given time.

Explanation:

imagine two or three waves reaching a particular particle x at the same time. The particle will vibrate those waves and give out or transmit a resultant wave which is the algebraic sum of the incoming two waves. If both the waves have the same amplitude and phase, the resultant wave will be amplified. However if the waves have the same amplitude and equal but opposite phase then the resultant wave will be a straight line

Answer:

20m

Explanation:

u=20ms−1

v=0

f=μmgcosθ

mgsinθ+f=ma

mgsinθ+μmgcosθ=ma

530​+0.5×10×54​=a

6+4=a

a=10ms−2

v2−u2=2as

0−202=2×(−10)×s

s=20m

A) There are 3.70 x 10¹⁶ Cs nuclei present initially and B) There are 2.27 x 10¹⁵ Cs nuclei present 2.6 min later.

A) To solve this problem, we can use the following equation,

\(N = N'2^{\frac{-t}{T_{1/2}}}\)), number of Cs nuclei present is N, initial number of Cs nuclei present is N', elapsed time is t, half-life of Cs-124 is T½. First, we need to convert the initial mass of Cs-124 to the number of nuclei present,

7.5 μg Cs-124(1g/10⁶μg)(6.022x10²³nuclei/1g)

= 4.52 x 10¹⁵ Cs-124 nuclei.

Using the equation above, we can find the number of Cs-124 nuclei present after 0 s,

\(N = 4.52 * 10^{15} * 2^{\frac{-0}{30.8}}}\)

= 4.52 x 10¹⁵ Cs-124 nuclei

Therefore, initially, there are 4.52 x 10¹⁵ Cs-124 nuclei present.

B) After 2.6 min (156 s), we can again use the same radioactivity equation to find the number of Cs-124 nuclei present,

\(N = 4.52 * 10^{15} * 2^{\frac{-156}{30.8}}}\)

N = 1.60 x 10¹⁴ Cs-124 nuclei

Therefore, 2.6 min later, there are 1.60 x 10¹⁴ Cs-124 nuclei present.

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Answer:

D. 12.5 min

Explanation:

Speed = distance ÷ time.

time = distance ÷ speed.

18km × 1000m = 18000m (as speed is in m/s).

time = 18000m ÷ 24.0m/s

t = 750s.

750s ÷ 60

= 12.5mins is your answer.

hope this helps. :)

Answer:

it is the white rhinoceros because it weighs more then the bullet all though the bullet travels faster once the rhino gets running it is hard to stop because it weighs so much

If the cells are in parallel, they form a battery of 1.5V with the ability to deliver 4 times as much current as one cell can.

If the cells are in series, they form a battery of 6.0V.

Answer:

A) Light refracts through different media, causing rainbows.

B) Light from the sun is moving through air and moisture at the same time.

E) Light moving through water moves at different speeds, causing different wavelengths to appear at separate locations.

Explanation:

The answers are A, B, and E because I got them on USATestprep

Answer:

According to Albert Einstein's equation, E = m·c², matter and energy are fundamentally related

Events that involve matter and energy that can be explained includes;

The boiling of water in a kettle

The rebound of objects including water after falling

The sound made by airplane and helicopters

Events involving matter and energy that are difficult to explain includes

The cause of the universe that manifest into about matter

The size of the universe

The fundamental object controlling gravity

Decipherable

1) The boiling of water in a kettle; Water boils by the addition of energy that raises the temperature of the particles which result in the forming of vapor as the bonds of the liquid state are broken by the fast moving molecules

2) The rebound of objects including water after falling from a height is proportional to the height from which the object is dropped, due to conservation of energy principle

3) The sound made by airplane and helicopters; This is due the interactions with the air to develop propulsion in the air

Difficult to decipher

1) The cause of the universe that manifest into about matter; The reason behind the formation of the universe is difficult to explain

2) The size of the universe; Will it be possible to know measure a universe

If the universe is measurable, how many universes do we have;

3) The fundamental object controlling gravity; What particle is responsible for gravity and the way if functions

Explanation:

The dragonfly must generate approximately 4.8 × 10^-4 Joules of energy to spin itself at a rate of 1100 rpm.

Start by converting the rotational speed from rpm (revolutions per minute) to rad/s (radians per second). Since 1 revolution is equal to 2π radians, we can use the conversion factor:

Angular speed (ω) = (1100 rpm) × (2π rad/1 min) × (1 min/60 s)

ω ≈ 115.28 rad/s

The moment of inertia (I) is given as 2.0 × 10^-7 kg⋅m².

Use the formula for rotational kinetic energy:

Rotational Kinetic Energy (KE_rot) = (1/2) I ω²

Substituting the given values:

KE_rot = (1/2) × (2.0 × 10^-7 kg⋅m²) × (115.28 rad/s)²

Calculate the value inside the parentheses:

KE_rot ≈ (1/2) × (2.0 × 10^-7 kg⋅m²) × (13274.28 rad²/s²)

KE_rot ≈ 1.331 × 10^-3 J

Round the result to the proper number of significant figures, which in this case is three, as indicated by the given moment of inertia.

KE_rot ≈ 4.8 × 10^-4 J

Therefore, the dragonfly must generate approximately 4.8 × 10^-4 Joules of energy to spin itself at a rate of 1100 rpm.

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So, the speed when it (the rock) hit the ground is 14 m/s.

Hi ! This question will direct you to the "Free Fall Motion" material. Why is that ? This is because there is a keyword "dropped" which means without initial speed and its named free fall motion. Its little bit of different, when the keyword "thrown", that's not a free fall motion. For the equations of velocity in free fall, follow the following equation:

\( \boxed{\sf{\bold{v = \sqrt{2 \times g \times h}}}} \) ... (i)

\( \boxed{\sf{\bold{v = \sqrt{2 \times g \times (h_1 - h_2)}}}} \) ... (ii)

With the following condition :

Note :

We know that :

What was asked :

Step by step :

\( \sf{v = \sqrt{2 \times g \times h}} \)

\( \sf{v = \sqrt{2 \times 9.8 \times 10}} \)

\( \sf{v = \sqrt{196}} \)

\( \boxed{\sf{v = 14 \: m/s}} \)

So, the speed when it (the rock) hit the ground is 14 m/s.

Answer: C ON EDGE 2021

Explanation:

Answer:

Charges are transferred from one object to another.

Explanation:

The charges from one object to another are sharing there energy.

Answer:

226.8 kN/m

Explanation:

The work done by the spring, W equals the kinetic energy of the satellite, K

W = K

work done by the spring, W = 1/2kx² where k = force constant and x = extension of spring

kinetic energy of the satellite, K = 1/2mv² where m = mass of satellite = 1060 kg and v = speed of satellite = 3.35 m/s

1/2kx² = 1/2mv²

k = mv²/x²

Also, the spring force F = kx where k = force constant and x = extension of spring.

k = F/x

equation both expressions for k, we have

mv²/x² = F/x

x = mv²/F since F = ma where m = mass of satellite and a = maximum acceleration of satellite = 5.00g and g = 9.8 m/s²

x = mv²/ma = mv²/5.00mg = v²/5.00g

Substituting the values of the variables into the equation, we have

x = v²/5.00g

= (3.35 m/s)²/(5.00 × 9.8 m/s²)

= 11.2225 m²/s²/49 m/s²

=0.229 m

Now k = F/x = 5.00mg/x

Substituting the values of the variables into the equation, we have

k = 5.00mg/x

k = 5.00 × 1060 kg × 9.8 m/s²/0.229 m

k = 51940 kgm/s²/0.229 m

k = 51940 N/0.229 m

k = 226812.23 N/m

k = 226.81223 kN/m

k ≅ 226.8 kN/m

The speed of  accelerated the bicycle be 120 m/s.

Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second

Given parameters:

Mass o the bicycle; m = 25 kg.

Mass of the SUV; M = 1500 kg.

To accelerate the car from a standing position to a speed of 2 m/s in one second, required force = mass × acceleration

= mass × ( final speed - initial speed)/time

= 1500 kg × ( 2 m/s - 0 m/s)/1s

= 3000 N.

Now if 3000 N force is applied on the bicycle, acceleration of it = 3000/25 m/s² = 120 m/s².

Hence, in one second, the speed of the bicycle be = acceleration × time

= 120 × 1 m/s.

= 120 m/s.

Hence the speed of the bicycle be 120 m/s.

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Answer:

Earth's magnetic field (and the surface magnetic field) is approximately a magnetic dipole, with the magnetic field S pole near the Earth's geographic north pole (see Magnetic North Pole) and the other magnetic field N pole near the Earth's geographic south pole (see Magnetic South Pole). This makes the compass usable for navigation. The cause of the field can be explained by dynamo theory. A magnetic field extends infinitely, though it weakens with distance from its source. The Earth's magnetic field, also called the geomagnetic field, which effectively extends several tens of thousands of kilometres into space, forms the Earth's magnetosphere. A paleomagnetic study of Australian red dacite and pillow basalt has estimated the magnetic field to be at least 3.5 billion years old

Answer:

Explanation:

Mechanical weathering types

Mechanical weathering is the breaking down of rocks into smaller pieces without changing the composition of the minerals in the rock. This can be divided into four basic types – abrasion, pressure release, thermal expansion and contraction, and crystal growth.

The example provided is most closely related to option C: Performance accomplishments.

Setting a mileage goal each week and becoming more confident about finishing the race indicates that Tina is actively working towards her goal of running a 5k race. By gradually increasing her mileage and gaining confidence, she is achieving performance accomplishments, which involve personal achievements and successful experiences.

Physiological states refer to the influence of one's physical and emotional condition on their confidence and motivation. Verbal persuasion involves receiving encouragement or positive feedback from others. Vicarious experience entails gaining confidence by observing and learning from others' successes.

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