8. Differentiate between each of these land designations made during the Progressive Era:

A. National Parks -

B. National Forests -

C. National Wildlife Refuges -​

Answer:

\({ \rm{F _{ball \: on \: bat} = - F _{bat \: on \: ball} }}\)

Explanation:

• This is due to the third newtons law of motion which states that "Every action has an equal and opposite reaction".

Answer:

Explanation:

500 W = 500 J/s

500 J/s(2 min(60 s/min) = 60000 J

Answer:

\(\rho=333.33\ kg/m^3\)

Explanation:

Given that,

A container is filled with liquid. At a depth of 60 cm it exerts a pressure of 2000 Pa.

We need to find the density of the liquid.

The pressure exerted by liquid at a depth is given by the formula as follows :

\(P=\rho gh\)

h = 60 cm = 0.6 m

g is acceleration due to gravity

Putting all the values,

\(\rho=\dfrac{P}{gh}\\\\\rho=\dfrac{2000}{10\times 0.6}\\\\=333.33\ kg/m^3\)

So, the density of the liquid is \(333.33\ kg/m^3\).

Answer:

Below

Explanation:

It will be  m * g * sin (angle of hill)       You will need to put in the numbers for 'm' and sin (angle)         and      g = 9.81 m/s^2  

Answer:

 m = 876.71 kg

Explanation:

This is an exercise of Archimedes' principle, which states that the thrust on a body is equal to the weight of the dislodged liquid  

        B = ρ g V  

therefore the load that the balloon can lift is  

       B - W_structure - w_load = 0

       w_load = B - W_structure

The volume of the balloon is  

      v = 4/3 π r³

let's substitute  

      w_carga = rho g 4/3 π r³ - m_structure g  

the air density at T = 25ºc is ρ = 1.18 kg / m³

let's calculate  

     w_load = 1.18 9.8 4/3 π 7.15³ - 930 9.8  

     w_load = 17705,77 - 9114  

     w_ load = 8591.77 N

this corresponds to a mass of  

   w_load = m g  

   m = w_load / g  

   m = 8591.77 / 9.8  

   m = 876.71 kg

The mass of the helium sample is approximately 0.187 g.

To solve this problem, we can use following formula:

w = nR(T2 - T1)

We can rearrange this formula to solve for n:

n = w / (R * (T2 - T1))

To find the mass of the helium sample, we can use following formula:

m = n * M

where m is the mass of the sample, n is  number of moles of gas, and M is the molar mass of helium.

Substituting the given values into the first equation, we get:

70 J = n * 8.31451 J/mol*K * (358 K - 283 K)

Simplifying this equation, we get:

n = 0.0467 mol

Substituting this value into the second equation, we get:

m = 0.0467 mol * 4 g/mol = 0.187 g

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Answer:

the particle is at coordinates (18,15/2)

Explanation:

To find the acceleration of the particle, we can use the formula for velocity: v = v0 + at, where v0 is the initial velocity, a is the acceleration, and t is the time. Since we know the initial and final velocities, as well as the time interval, we can solve for the acceleration:

a = (v - v0)/t = [(9i + 7j) - (3i - 2j)]/3 = (6i + 9j)/3 = 2i + 3j

So the acceleration of the particle is a = 2i + 3j m/s².

To find the coordinates of the particle at t=3s, we can use the formula for position: r = r0 + v0t + 1/2at², where r0 is the initial position. Since the particle starts at the origin, r0 = 0. Plugging in the values we have:

r = 0 + (3i - 2j)(3) + 1/2(2i + 3j)(3)² = 9i - 6j + 9i + 27/2 j = 18i + 15/2 j

We can use the kinematic equations of motion to solve this problem.

Let the acceleration of the particle be a = axî + ayj.

(a) Using the equation of motion v = u + at, where u is the initial velocity:

f = v = u + at

Substituting the given values, we get:

(91+7j) = (3î-2j) + a(3î + 3j)

Equating the real and imaginary parts, we get:

91 = 3a + 3a (coefficients of î are equated)

7 = -2a + 3a (coefficients of j are equated)

Solving these equations simultaneously, we get:

a = î(23/6) + j(1/2)

So the acceleration of the particle is a = (23/6)î + (1/2)j.

(b) Using the equation of motion s = ut + (1/2)at^2, where s is the displacement and u is the initial velocity:

At t = 3s, the displacement of the particle is:

s = ut + (1/2)at^2

Substituting the given values, we get:

s = (3î-2j)(3) + (1/2)(23/6)î(3)^2 + (1/2)(1/2)j(3)^2

Simplifying, we get:

s = 9î + (17/2)j

So the coordinates of the particle at t=3s are (9, 17/2).

Answer:

Explanation:

The professor drew this wrong... note the slight bend entering the object.. well.. the ray would also bend back leaving that object... and the bend again entering it... like this picture that i'll attach...

With a 9.0 voltage battery connected with two resistors, one is 10 ohms and the other resistor is at 20 ohms the voltage drop across the battery 1 volt. Thus, option A is correct.

Given data

voltage supplied Vs= 1.5 volts

resistance R1= 1000 ohms

resistance R2= 500 ohms

The total resistance is

Rt= 1000+ 500

Rt= 1500 ohms

In series connection the current is the same for all components while the voltage divides across all components,the voltages consumed by each individual resistance is equal to the source voltage.

Therefore, With a 9.0 voltage battery connected with two resistors, one is 10 ohms and the other resistor is at 20 ohms the voltage drop across the battery 1 volt. Thus, option A is correct.

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Answer: B) 29.4 m/s^2

Explanation:

The g force is the gravitational force equivalent. Recall,

gravitational acceleration = 9.8m/s^2

This means that the 1 g force is equivalent to an acceleration of 9.8m/s^2

From the information given,

riders can experience a force of up to 3 g. Thus, the maximum acceleration of the roller coaster is

3 x 9.8

= 29.4

B) 29.4 m/s^2

The single cable will pull upward on the sign with a force of 38.3 N.

Single cable is a type of cable that is composed of a single electrical conductor. It is most commonly used in low voltage applications such as wiring for computers and domestic appliances. Single cable is typically insulated with rubber, PVC or other insulating materials. The insulator protects the conductor from short circuits and other electrical hazards.

This is because the sign is supported symmetrically by two cables, which means that the total downward force on the sign is equal to the total upward force. Since the two cables make an angle of 1.0 degrees with the horizontal, the total downward force on the sign is equal to the combined weight of the sign (38.3 N) and the two cables pulling down on it. Therefore, the single cable must pull up with a force of 38.3 N in order to keep the sign in equilibrium.

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Figures 1, 2, and 4 are correct since they follow the condition of ohm's law.

Ohm's law states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance, and directly proportional to the resistance of the circuit. The formula for Ohm's law is V=IR.

Ohm's law is I(the strength of the current flowing in a conductor)= V(the potential difference applied to the ends) divided by R(resistance)

so the figures have to satisfy the condition V = IR to demonstrate the ohmic behavior.

This indicates that current is directly proportional to voltage.

That is when current increases voltage also increases and vice versa.

Option 3 is incorrect, as when the current increases voltage cannot be constant.

Also, the graph should be linear:

Therefore, options 1, 2, and 4 are correct.

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Complete question:

Answer:

the unbalanced force

Explanation:

An unbalance forces are defined as the forces which causes a change in the speed or velocity of a moving object. A force causes a change in the motion of a body and an unbalanced force causes the body to change its velocity and speed or a change in its direction.

An unbalanced force will start movement in a static object or it can cause to speed up the moving object or it can cause to stop the moving object.

Thus an unbalanced force causes the cart to speed up.

Answer:

Explanation:

Need a diagram....

Answer:

Step 1: List the mass and velocity of the object. Step 2: Convert any values into SI units (kg, m, s). Step 3: Multiply the mass and velocity of the object together to get the momentum of the object.

Answer:

n = c/v = (3.00 x 108 m/s)/(2.76 x 108 m/s) = 1.09. This does not equal any of the indices of refraction listed in the table.

Electrons will move in anti- clockwise direction in the coil when the south end of the magnet goes through the coil

If you flip the magnet to bring its south pole towards the coil, the current flows in the direction that produces a magnetic field whose south pole faces the magnet . And as we know that , in south pole of the coil , the current will move in clockwise direction . Hence , electrons will move in anticlockwise direction because electrons move in opposite direction of the current .

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The type of spectrum you're describing is an absorption spectrum.

In an absorption spectrum, specific wavelengths of light are absorbed by a substance and then re-emitted in random directions, which can make those wavelengths appear darker or completely black when the light is viewed in a specific direction (such as through a spectroscope).

The black lines you're seeing are specific wavelengths that have been absorbed by the substance you're observing. The colors of these lines correspond to the energy of the photons that have been absorbed. For example, a black line in the purple part of the spectrum indicates that the substance has absorbed light with a wavelength corresponding to purple light.

This is different from an emission spectrum, where you would see bright lines on a dark background. These bright lines correspond to the specific energies of photons that are being emitted by the substance.

The spectrum is not infrared, as infrared light is not visible to the human eye and would not appear in a visible spectrum.

The term "electromagnetic" refers to the type of waves that light consists of, but it does not specify a particular type of spectrum. Both absorption and emission spectra are types of electromagnetic spectra, as they both involve the interaction of electromagnetic waves (light) with matter.

Answer:

PE = 82.32J

Explanation:

PE = m*g*h

PE = 2.80kg*9.8m/s²*3m

PE = 82.32J

Answer:

3000 J (joules)

Explanation:

Use the formula for kinetic energy which is:

\( k.e = \frac{1}{2} mv ^{2} \)

Where m is the mass and v is the velocity. If we put the values into the formula we get: 0.5 * 15 * (20)*(20) = 3000J

Answer:

d

Explanation:

Answer:

C

Explanation:

Horsepower refers to the power an engine produces. It's calculated through the power needed to move 550 pounds one foot in one second or by the power needs to move 33,000 pounds one foot in one minute. The power is gauged by the rate it takes to do the work.

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The height of the object, given that the potential energy of the object doubled will be double (option D)

First, we shall list out the given parameters. Details below:

Potential energy is given as:

PE = mgh

Keeping mg constant, we have

PE₁ / h₁ = PE₂ / h₂

Inputting the given parameters, we have

P / h = 2P / h₂

Cross multiply

P × h₂ = h × 2P

Divide both sides by P

h₂ = (h × 2P) / P

h₂ = h × 2

h₂ = 2h

Thus, we can conclude that the new height of the object will also double (option D)

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