Collision practice

Running at 2.0 m/s, Bruce, the 45.0-kg quarterback, collides with Biff, the 90.0 kg tackle, who is traveling at 7.0 m/s in the other direction. Upon collision,
Biff wraps up Biff for the tackle. What is the resultant velocity of the players.

V=————— m/s

Answer:

Explained below

Explanation:

- Friction is the force that opposes the motion between two or more objects/surfaces in contact with each other.

- On an inclined plane, the coefficient of static friction is given by the relation;

μ = F_max/F_n

Where;

F_max is maximum frictional force before slip = mg sin θ

F_n is normal force = mg cos θ

Thus;

μ = mg sin θ/mg cos θ

μ = tan θ

Answer:

hello your question is incomplete attached below is the complete question with the options

answer : Doubling the Diameter increases the heat transfer rate by a factor of 4  ( B )

Explanation:

The heat transfer in the axial direction of the cylinder can be calculated/determined as attached below

[tex]\frac{q_{2} }{q_{1} } = \frac{(2D)^2}{D^2}[/tex]

[tex]q_{2}[/tex] = 4[tex]q_{1}[/tex]  ( This shows that Doubling the diameter increases the heat transfer rate by a factor of 4 )

Answer:

408.33watts

Explanation:

Power is expressed according to the formula

Power = work done/time

Power = force × distance/time

Power = Force× velocity

Find the force

F = mv/t

F = 600×1.75/4.5

F = 1050/4.5

F=233.33N

Get the power

Power = 233.33×1.75

Power = 408.33watts

Hence the average power of the elevator motor during this period is 408.33m/s

Answer:

C. the top line represents a greater velocity

Explanation:

The graph is a distance - time graph.

The distance is on the y-axis and time is on the x - axis.

For this graph, the slope is the velocity.

The lower line is not so steep and its slope is lesser compared to the upper one.

Answer:

words that have the same sound but different spellings and meaning

Explanation:

Homophones are generally words that sound the same but have different spellings and even meaning.

For example the words new and knew are homophones.

They have the same sound when pronouncing but their meaning is different.

Also, the words bawl and ball are homophones.

We see that both words have very similar pronunciation but their meanings are completely different.  

Answer:

Heat transfer processes: Radiation - Natural Convection

Energy balance:

[tex]\dot Q_{rad} -\dot Q_{conv} = \frac{dU_{sys}}{dt}[/tex]

[tex]\epsilon\cdot \sigma\cdot A_{s}\cdot (T_{s}^{4}-T_{a}^{4})-h\cdot A_{s} \cdot (T_{a}-T_{\infty}) = m\cdot c\cdot \frac{dT_{a}}{dt}[/tex]

Explanation:

The asphalt is heated due to the radiation from the sun and cooled by natural convection of the wind. By the First Law of Thermodynamics, we have the following model that represents the system:

[tex]\dot Q_{rad} -\dot Q_{conv} = \frac{dU_{sys}}{dt}[/tex] (1)

Where:

[tex]\dot Q_{rad}[/tex] - Heat transfer by radiation, measured in watts.

[tex]\dot Q_{conv}[/tex] - Heat transfer by natural convection, measured in watts.

[tex]\frac{dU_{sys}}{dt}[/tex] - Rate of change of thermal energy of the asphalt, measured in watts.

By applying the definitions for conduction, radiation and thermal energy, we expand (1) below:

[tex]\epsilon\cdot \sigma\cdot A_{s}\cdot (T_{s}^{4}-T_{a}^{4})-h\cdot A_{s} \cdot (T_{a}-T_{\infty}) = m\cdot c\cdot \frac{dT_{a}}{dt}[/tex] (2)

Where:

[tex]\epsilon[/tex] - Emissivity of the asphalt.

[tex]\sigma[/tex] - Stefan-Boltzmann constant, measured in watts per square meter-quartic Kelvin.

[tex]A_{s}[/tex] - Surface area of the asphalt, measured in square meter.

[tex]T_{s}[/tex] - Temperature of the sun, measured in Kelvin.

[tex]T_{a}[/tex] - Temperature of the asphalt, measured in Kelvin.

[tex]T_{\infty}[/tex] - Temperature of the wind, measured in Kelvin.

[tex]h[/tex] - Natural convection constant, measured in watts per square meter-Kelvin.

[tex]m[/tex] - Mass of the asphalt, measured in kilograms.

[tex]c[/tex] - Specific heat of the asphalt, measured in joules per kilogram-Kelvin.

Answer:

1) solvent

2) liquid-solid

3) gas - gas

Explanation:

1) A solution is the homogenous mixture of two or more substances in such a way that its components are uniformly distributed. In any solution, the solvent make up the greatest quantity or volume while the solute is of lesser quantity.

2) liquid-solid is the most common type of solution.

3) A gas solution can be a gas dissolved in a gas, or a liquid dissolved in a gas, or a solid dissolved in a gas.  Air is a gas - gas solution, it is composed of oxygen and other dissolved gases in nitrogen

Answer:

B, A, B

Explanation:

had this USA test prep

Answer:

93312000 Joules

Explanation:

Energy can be explained as the capacity for doing work. And can be expressed as

E= pt....................eqn(1)

Where

E= Energy in Joules

P= power in Watt= 2.00W

t= time in seconds

Time= 18 months, which can be converted to "seconds" as;

18 months = [ 18 monthsx 30 days x 24 hours x 60 min x 60 sec] = 46656000

Then

time= 46656000 seconds

Power=2 watt

If we substitute into equation (1) we have

Energy = 2 watt × 46656000 seconds

Energy= 93312000 Joules

Answer:

work done = 71.5 J

Explanation:

Given that,

Energy = Fifty eight J

Mass of box = 12.0 Kg

Speed = 1.5 m/s

U = work done

The external force acts solely on the box and also the earth system. conjointly note that the work done by external force

= modification of energy of the system

U = work done - K

Also recall that the box is moving with constant speed therefore, there will not be modification in acceleration, hence, there'll be no modification in K.E..

Therefore, K is adequate to zero.

K= 0

U = work done = energy

U = 58.0 J

work done by pushing force = K + U

work done = final K.E. - initial K.E. + U ........1

Initial K.E. = zero

Substitute the mandatory values into equation one

work done = 1/2m v² - zero + U

work done= 0.5 x 12.0 x 1.5² + 58.0

= 13.5+58.0

work done = 71.5 J

The world one by the pushing force is 71.5 J

Answer:

a = 0.009 J

b = 0.19 m/s

c = 0.005 J and 0.004 J

Explanation:

Given that

Mass of the object, m = 0.5 kg

Spring constant of the spring, k = 20 N/m

Amplitude of the motion, A = 3 cm = 0.03 m

Displacement of the system, x = 2 cm = 0.02 m

a

Total energy of the system, E =

E = 1/2 * k * A²

E = 1/2 * 20 * 0.03²

E = 10 * 0.0009

E = 0.009 J

b

E = 1/2 * k * A² = 1/2 * m * v(max)²

1/2 * m * v(max)² = 0.009

1/2 * 0.5 * v(max)² = 0.009

v(max)² = 0.009 * 2/0.5

v(max)² = 0.018 / 0.5

v(max)² = 0.036

v(max) = √0.036

v(max) = 0.19 m/s

c

V = ±√[(k/m) * (A² - x²)]

V = ±√[(20/0.5) * (0.03² - 0.02²)]

V = ±√(40 * 0.0005)

V = ±√0.02

V = ±0.141 m/s

Kinetic Energy, K = 1/2 * m * v²

K = 1/2 * 0.5 * 0.141²

K = 1/4 * 0.02

K = 0.005 J

Potential Energy, P = 1/2 * k * x²

P = 1/2 * 20 * 0.02²

P = 10 * 0.0004

P = 0.004 J

The total energy of the system is 0.009 J

The maximum speed of the object is 0.19 m/s

The kinetic and potential energies of the system when the displacement is 2.00 cm are 0.005 J and 0.004 J respectively

The object is under simple harmonic motion.

Given that the mass of the object m =0.5 kg , spring constant k = 20N/m

(a) The total energy of the system in SMH,

[tex]E=\frac{1}{2}kA^2[/tex]

If the amplitude of motion A = 3cm = 0.03m, then total energy

[tex]E=\frac{1}{2}*20*0.03*0.03 J\\\\E = 0.009J[/tex]

E = 0.009J is the total energy of the system.

(b) maximum speed of the object

the maximum kinetic energy of the object = total energy of the object

[tex]\frac{1}{2} m(v_{max})^{2} =E\\\\v_{max}=\sqrt{2E/m}\\\\v_{max}=\sqrt{2*0.009/0.5}\\\\v_{max}=0.19m/s[/tex]

0.19 m/s is the maximum speed

(c) KE and PE when x = 2cm = 0.02m

potential energy at x = 0.02

[tex]PE=\frac{1}{2}kx^2\\\\PE=\frac{1}{2}*20*0.02*0.02\\\\PE= 0.004J[/tex]

Now, Kinetic energy + potential energy = total energy

KE + PE = E

KE = E - PE

KE = 0.009J - ).004J

KE = 0.005J

The kinetic and potential energies are 0.005 J and 0.004 J respectively.

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Answer:7139800000

Explanation:

The largest planet in the solar system is Jupiter. Its equatorial diameter is approximately 143,000 kilometres (ca. 88,856 mi miles).

Jupiter is a gas giant because it consists largely of gas and liquid, as opposed to solid substance. With an equator diameter of 142,984 kilometres (88,846 mi), it is the solar system's biggest planet.

About 80% of Jupiter is hydrogen, and 20% is helium. Over a solid core, a thick layer of liquid hydrogen is covered by swirling gas. At 1,000 kilometres below the cloud layer's outer edge, there is a lot of pressure. The hydrogen gas changes into a liquid there.

Therefore, By squaring the scale factor for length, the scale factor for area may be calculated. Consequently, s2 is the scale factor for area. If the situation is the opposite, a solution to the issue under investigation is offered. The area scale factor is 2.

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Explanation:

The most established layers are on the base, and the most youthful layers are on the top. Since dregs here and there incorporate once-living creatures, sedimentary stone regularly contains a great deal of fossils. Fossils are once living beings that have been transformed into rock, fit as a fiddle or type of the creature can in any case be seen.

Answer:

basically I will tell you the definition

Explanation:

so when charges are unbalanced statistic energy is formed positive attract negative and negative attracts positive like repell while unlike attract .

Answer:

c. 337

Explanation:

can someone answer my question

Answer:

The specific charge is defined as a charge by mass ratio i.e e/m. The charge on an electron (e) = 1.602 X 10-19C. The mass of the electron (m) = 9.1×10−31Kg.

Answer:

Gravity creates stars and planets by pulling together the material from which they are made.

Explanation: This is all I have I don't know if my test is the same a others though.

Answer:

Gravity

Explanation:

Gravity keeps things together. It is a force that attracts matter towards it. Anything with mass creates gravity

Answer:

9.54 Kpa

Explanation:

Given :

Pheart = 13.3 * 10^3

Density of blood (ρ) = 1060 kg/m³

Difference in height of brain and heart in standing position = - 0.5

Difference in height of Brain a d heart in bending position = 0.4

g = acceleration due to gravity = 10 m/s²

Blood pressure of brain in standing position:

Pheart + ρ*g(-0.5)

13.3 * 10^3 + 1060 * 10 * - 0.5

13300 - 5300 = 8000 pascal = 8Kpa

Blood pressure of brain in bending position:

Pheart + ρ*g(0.4)

13.3 10^3 + 1060 * 10 * 0.4

13300 + 4240 = 17540 Pa = 17.54 Kpa

17.54Kpa - 8Kpa

= 9.54 Kpa

Answer ) Sound level equation

The intensity of a sound wave is related to its amplitude squared by the following relationship: I=(Δp)22ρvw I = ( Δ p ) 2 2 ρ v w . Here Δp is the pressure variation or pressure amplitude (half the difference between the maximum and minimum pressure in the sound wave) in units of pascals (Pa) or N/m2.

Answer:

I) True,  II) False,  III) False,  IV) True    

Explanation:

In this exercise, it is asked to answer different statements, for this we will use the relationship between angular and linear velocity

           v = w r

let's review the claims

I) True. From the initial equation we see that the linear velocity depends on the radius

II) False. All points rotate with the same angular velocity

III) False. Linear velocity changes with radius

IV) True. The angular velocity of all points is the same

At various radial points on a rotating Ferris wheel have, different linear velocity (True), different angular velocity (false), equal linear velocity (false) and equal angular velocity (True).

The angular velocity of a rotating Ferris is calculated as follows;

[tex]\omega = \frac{v}{r} = 2\pi N[/tex]

The linear velocity of a rotating Ferris is calculated as follows;

v = ωr

where;

The linear velocity increases with increase in radius.

Thus, we can conclude that, at various radial points on a rotating Ferris wheel have;

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Answer:

there is not a picture below  but it would be because the beaker was put in cold water then the temp decreased

Explanation:

Answer:

  58.9 N [W24.8°N]

Explanation:

The vectors are at right angles, so the magnitude of their sum is ...

  √(38² +45²) ≈ 58.9 . . . . newtons

The angle Fc makes with Fa can be found using the arctangent:

  angle between Fa and Fc = arctan(45/38) ≈ 49.8°

The direction required for the sum of the vectors to be zero is the opposite of [E(49.8° -25°)S], so is [W24.8°N]

The vector that makes the sum zero is 58.9 N [W24.8°N].

Answer:

1: E

2: A

3: C

4: B

5: D

Explanation:

Answer:

A

Explanation:

Myra is struggling to be a great wife, attentive mother, and an innovative designer all at the same time.

Myra's scenario is most accurately represented by role conflict because she  is struggling to be a great wife, attentive mother, and an innovative designer all at the same time.

When there are expectations put on an individual that are not compatible with one another in relation to their profession or position, this may lead to role conflict. When a someone feels as if they are being tugged in several ways while attempting to react to the multiple statuses they hold, they are experiencing role conflict.

The work-family conflict, also known as the struggle one has when torn between the demands of personal and professional responsibilities, is perhaps the clearest illustration of role conflict.

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Answer:

200

Explanation:

subtract it it's 275

Answer:

[tex]V_{pa}=690km/hr[/tex]

Explanation:

In order to solve this problem, we can start by drawing a diagram of what the problem looks like. (See attached picture).

We can treat this as a vector problem, so we can start by finding the velocities of the plane with respect to the earth as it goes north and east. Velocity is found by using the following formula:

[tex]Velocity=\frac{distance}{time}[/tex]

so

[tex]V_{paN}= \frac{780km}{2hr}[/tex]

[tex]V_{paN}=390 km/hr[/tex]

Since air isn't affecting the north direction of the plane, we will keep this as the velocity due north.

Now let's find the velocity of the plane with respect to the earth towards the east:

[tex]V_{pE}=\frac{810km}{2hr}[/tex]

[tex]V_{pE}=405 km/hr [/tex]

In this case, since the wind is blowing from east to west, then it affects directly the velocity of the plane with respect to the earth, so we can use the following formula to determine the Velocity of the plane with respect to the air in the eastern direction:

[tex]V_{paE}-V_{a}=V_{pE}[/tex]

so we can solve this for the velocity of the plane on the air towards the east, so we get:

[tex]V_{paE}=V_{pE}+V_{a}[/tex]

so we get:

[tex]V_{paE}=405 km/hr + 165km/hr[/tex]

[tex]V_{paE}=570 km/hr[/tex]

So now we can use this data to find the velocity of the plane with respect to the air:

[tex]V_{pa}=\sqrt{V_{paN}^{2}+V_{paE}^{2}}[/tex]

so we get:

[tex]V_{pa}=\sqrt{(390km/hr)^{2}+(570km/hr)^{2}}[/tex]

[tex]V_{pa}=690.65 km/hr[/tex]

Answer:

O inertia

Explanation:

The moon's property that prevents it from being pulled inward by the Earth is called it's inertia.

Every object in the universal space have gravitational force of attraction to one another due to their masses.

An inertia is the reluctant of a body to move or the tendency of it to remain in constant motion.

Inertia entails the property of objects to remain at rest or continue in uniform motion.

As the force of gravity acts between the earth and the moon, inertia keeps a body in constant position.

Answer:

What should we find state that first.

Answer:

8.8s

Explanation:

Given parameters:

Acceleration  = 1.6m/s²

Initial velocity  = 36m/s

Final velocity  = 50m/s

Unknown:

Time taken for the acceleration  = ?

Solution:

Acceleration is the rate of change of velocity with time;

      Acceleration  = [tex]\frac{Final velocity - initial velocity }{time taken }[/tex]  

Insert the parameters and solve for time taken;

   1.6  = [tex]\frac{50 - 36}{t}[/tex]  

    1.6t  = 14

         t  = 8.8s

Answer:

In our house ceilings.

Explanation:

In our daily life, iron rod is used in the construction of ceiling of our homes which made our ceiling stronger enough to make it multi story. It is extensively used in big construction projects such as multi story buildings and other tall buildings etc. So we can say that iron rod is used for construction of big houses and buildings.