A 2kg hockey puck on a frozen pond is given an initial speed of 20 m/s. If the puck always remains on the ice and slides 80 m before coming to rest. What is the frictional force acting on the puck (in N)? a. 5 b. 10 112 C. 4 O d. 8

It would take 6416.8 kJ of heat to vaporize 1.22 kg of helium at its boiling point.

Helium is a chemical element with the symbol He and atomic number 2.

The amount of heat needed to vaporize a substance can be calculated using the formula:

Q = m * ΔHv

Where

For helium, the heat of vaporization is 21.1 kJ/mol at its boiling point of -268.9°C. The molar mass of helium is 4.003 g/mol.

To calculate the amount of heat needed to vaporize 1.22 kg of helium, we first need to convert the mass to moles:

1.22 kg He * (1000 g / 1 kg) * (1 mol / 4.003 g) = 304.4 mol He

Then, we can use the formula to calculate the amount of heat needed:

Q = m * ΔHv = 304.4 mol * 21.1 kJ/mol = 6416.8 kJ

Therefore, it would take 6416.8 kJ of heat to vaporize 1.22 kg of helium at its boiling point.

Learn more about helium here : brainly.com/question/26226232

#SPJ1

Using third equation of kinematics

\(\\ \rm\longmapsto v^2=u^2+2as\)

\(\\ \rm\longmapsto v^2=0^2+2(0.5)(1.6)\)

\(\\ \rm\longmapsto v^2=1.6\)

\(\\ \rm\longmapsto v=\sqrt{1.6}\)

\(\\ \rm\longmapsto v=0.4m/s\)

Now using 1st equation of motion

\(\\ \rm\longmapsto v=u+at\)

\(\\ \rm\longmapsto t=v-u/a\)

\(\\ \rm\longmapsto t=\dfrac{0.4-0}{0.5}\)

\(\\ \rm\longmapsto t=\dfrac{4}{5}\)

\(\\ \rm\longmapsto t=0.8s\)

Answer:

Using third equation of kinematics

\(\begin{gathered}\\ \rm\longmapsto v^2=u^2+2as\end{gathered}\)

⟼v

2

=u

2

+2as

\(\begin{gathered}\\ \rm\longmapsto v^2=0^2+2(0.5)(1.6)\end{gathered}\)

⟼v

2

=0

2

+2(0.5)(1.6)

Answer:

See explanation below

Explanation:

First thing to do here, is to calculate the speed of each runner. The problem states that both runners jog at a constant speed. We are given data for both runners, the starting time and the time where both of them reach the same distance.

With these data we can calculate the speed of both runners. Let's do it with runner 1:

If by t  = 25 s it reach a 64 m of distance, then his speed:

V = d/t   (1)

Replacing we have:

V₁ = 64 / 25 = 2.56 m/s

With this speed we can calculate the distance at t = 45 s so:

d = V * t    (2)

d₁ = 2.56 * 45

So Runner 1 will be at 115.2 from the starting point at 45 seconds.

For runner 2, he began at t = 2.5 s, but he reach the 64 m at 25 s, so his speed would be:

V₂ = 64 / (25-2.5) = 2.84 m/s

And the distance at t = 45 s

d₂ = 2.84 * 45

Runner 2 is 127.8 m from the starting point at 45 seconds.

Hope this helps

Answer:

Mix

Explanation:

A battery has two electrodes, at one end it has the anode and the other end has the cathode. Electrons travel through the circuit from the anode (negative) to the cathode (positive), and this is the driving force that provides electricity to flow through circuits.

The anode needs to have a low electron affinity because it needs to readily release electrons, and the cathode needs to have a high electron affinity because it needs to readily accept electrons.

The given paraboloid coordinate system (u, v, ϕ) with x = u.v cosϕ,

y = u.v sinϕ , z = 1/2 (u2 - v2) is orthogonal. The gradient is ∇f = (∂f/∂u) e_u + (∂f/∂v) e_v + (∂f/∂ϕ) e_ϕ ; divergent is ∇²f = ∇ · (∇f) ; curl is (∇ x) and laplacian is  (∇²).

We can prove that the paraboloid coordinate system (u, v, ϕ) is orthogonal, by computing the dot products of the basis vectors. The basis vectors in this coordinate system are given by:

e_u = (∂x/∂u, ∂y/∂u, ∂z/∂u) = (v cosϕ, v sinϕ, u)

e_v = (∂x/∂v, ∂y/∂v, ∂z/∂v) = (u cosϕ, u sinϕ, -v)

e_ϕ = (∂x/∂ϕ, ∂y/∂ϕ, ∂z/∂ϕ) = (-u.v sinϕ, u.v cosϕ, 0)

By Taking the dot products, we find that e_u · e_v = 0, e_v · e_ϕ = 0, and e_ϕ · e_u = 0. This proves that the basis vectors are mutually perpendicular, and therefore, the coordinate system is orthogonal.

Next, we can calculate the gradient (∇) in this coordinate system. The gradient of a scalar function f(u, v, ϕ) is given by:

∇f = (∂f/∂u) e_u + (∂f/∂v) e_v + (∂f/∂ϕ) e_ϕ

The divergence (∇ ·) and curl (∇ x) can be computed using the standard formulas in terms of the basis vectors. Finally, the Laplacian (∇²) can be obtained by taking the divergence of the gradient:

∇²f = ∇ · (∇f)

Thus, By evaluating these operations in the given coordinate system using the appropriate partial derivatives, we can determine the gradient, divergent, curl, and Laplacian for any scalar function in the (u, v, ϕ) coordinates.

To know more about orthogonal system here

https://brainly.com/question/31955761

#SPJ4

Answer:

The correct answer is Uranus and Neptune

v(speed) = wavelenght x frequency

v = 0.579 m x 4 hz = 2.32 m/s

Answer:

I would say vitamin B-6

Explanation:

it is also known as pyridoxine. it helps ebzymes break down protein and carry the dismantled amino acids to the blood stream

Hope this helps ✌✌

Answer:

The body needs small amount of vitamin B-6 to help enzymes break down protein and carry the dismantled amino acids to the blood stream.

Answer

Newton's law of gravitation, statement that any particle of matter in the universe attracts any other with the force varying directly the product of the masses and inversely as the square of the distance between them. ...

Answer:

21.4 mph

Explanation:

Circumference of tire in FEET   = pi * d =  pi * 1 ft = pi  feet

pi feet  x  600 rot/min  *  60 min /hr  *  1 mile / 5280 feet = 21.4 mph

The average acceleration of the helicopter, given that it changes its velocity from 22.0 m/s to 10.0 m/s is –1.5 m/s²

We understood that acceleration is defined as the change in velocity with time i.e

a = (v – u) / t

With the above formula, we can determine the average acceleration of the helicopter. Details below

The following data were obtained from the question:

a = (10 – 22) / 8

a = –12 / 8

a = –1.5 m/s²

Thus, we can conclude that the average acceleration is –1.5 m/s²

Learn more about acceleration:

https://brainly.com/question/21300541

#SPJ1

The energy of the high energy neutron is 940.51 MeV.

Speed is nothing but the distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity with the SI unit meter/second.

We know that mass of the neutron m₀ = 939.6 MeV/c²

A high energy neutron is travelling at a speed of 18 million m/s.

Given that, v = 1.8 * 10⁷ m/s

The energy of neutron is calculated with the formula, m₀* c²/√(1 - v²/c²)

⇒ 939.6 * (3* 10⁸)²/√[1 - (1.8 * 10⁷)²/(3* 10⁸)²]

⇒ 940.51 MeV

To know more about energy:

https://brainly.com/question/29746692

#SPJ4

The force on Object A = 1116.07 N

The separation between the two charges, d = 1.68 cm

d = 1.68/100 m

d = 0.0168 m

The charge on object A

The charge on object B

The electric constant

The force on on the charge A is calculated as shown below:

The force on Object A = 1116.07 N

it would be on the right end I believe. Forgive me if I am incorrect.

Answer:

Please find the answer in the explanation.

Explanation:

Given that 16 g CH4 + 64 g 02 - 44 g CO2 + 36g H2O

To explain the law of conservation of mass and describe how the equation represents the law of conservation of mass, let me first start from law.

The law state that: mass can neither be created nor destroyed.

The mass of each element at the reaction side must be equal or the Same with the magnitude of mass at the product

The equation represents the law of conservation of mass because the mass of molecules at the right hand side is equal to or balance with the molecules at the left hand side. For example, the number of Oxygen, and othe elements are the at both side.

Answer:

B

Explanation:

Water is essential to most bodily functions.

Answer:

150w

Explanation:

power = workdone/time

9000/60

150w

Answer:

V initial = 29.4 m.s²

Explanation:

( Using the laws of motion)

V final = V initial + Acceleration × time

0 = V initial + ( -9.8)(3)

29.4 = V initial

* I took upward as positive that's why I substituted -9.8 *

* for V final we know that at maximum height the ball is not moving thats why is = 0 *

Using a set of pulleys, Diana hoists a piano weighing 1000 N. To draw in 20.0 m of rope, she applies 250 N of force. The separation is 5m.

given,

Load force = 1000 N

Effort distance = 20.0 m

Effort force=250N

If this were an ideal machine, we could calculate the force Diana applied as follows:

The equation that follows links load force to effort force for a perfect machine;

Effort force × effort distance = Load force × Load distance

When we enter the parameters into the formula, we get;

Load distance = Effort force × effort distance/Load force

                         =250×20/1000

                         = 5 m

Load distance  = 5 m

In mechanics, force is any action that tends to maintain or alter the motion of a body or distort it. The concept of force is commonly explained in terms of Isaac Newton's three laws of motion, as stated in his Principia Mathematica (1687). Newton's first principle states that a body at rest or moving at a uniform rate in a straight line will remain in that state until some force is applied to it. The second law states that when an external force acts on a body, it causes an acceleration (change in velocity) of the body in the direction of the force.

Learn more about force here:

https://brainly.com/question/28875770

#SPJ4

Answer:

See below ~

Explanation:

Integrating x⁴ from c to d

Answer:

Basic units=those units of measurement which do not depend upon any other units are called basic units. Example length, mass, time, current etc.

Derived units=those units which are expressed in terms of fundamental units are called derived units. Example area, volume, density etc.

ANSWER:

0.4081%

Explanation:

Difference=24.6-24.5=0.1

Relative error = 0.1/24.5*100=0.4081%

Relative error is equal to the = difference between both the values/The true value *100

Answer:

hi i only dont understand want ur saying

Answer:

The correct option is;

A.

Explanation:

The speed of sound varies with the medium within which the sound propagates. Therefore, the wavelength of the sound wave changes as it moves from one medium to another

The speed of sound in liquid which is given by the square root of the ratio of the bulk modulus (compression resistance) to the density of the liquid is generally faster than in gas, therefore, given that the frequency of the sound source in constant, the wavelength, λ, given as λ = v/f, which is therefore, directly proportional to the speed of sound, also reduces, which is represented by a reduced distance between successive crest as seen in figure A.

Plugging in for the Earth's mass and for G, we have 11.2 km/s for the escape velocity for an object launched from the Earth's surface. This is about 25,000 miles per hour

200N force is needed to stop a 100-kg football player if she negatively accelerates (decelerates) at 20 m/s2

we have given in the statement

mass=100kg

acc= -20m/s^2

F=?

from newton's formula, we will find force

F=ma

F=100kg×20m/s^2

F=200N

To know more about  force visit : https://brainly.com/question/1675020

#SPJ1

Given:

• Height = 40 m

• Mass of ball 1 = 5 kg

• Mass of ball 2 = 10 kg

• Mass of ball 3 = 15 kg

Given that the three balls have equal volumes and are dropped from rest, let's answer the following questions:

• (a). Describe and explain the order in which the balls impact the ground at a time t.

To