Compute the estimated energy expenditure (ml ⋅ kg−1 ⋅ min −1) during horizontal treadmill walking for the following examples:
a. Treadmill speed = 50 m ⋅ min −1 Subject’s weight = 62 kg
b. Treadmill speed = 80 m ⋅ min −1 Subject’s weight = 75 kg

(a) The magnitude of the average force acting on the car to bring it to rest is 120,000 N.

(b) The horizontal (vx) and vertical (vy) components of this velocity is 9.66 m/s and 2.59 m/s respectively.

The magnitude of the force acting on the car is calculated as follows;

F = mv / t

where;

F = ( 1200 kg x 10 m/s ) / ( 0.1 s )

F = 120,000 N

The horizontal and vertical component of the velocity of the car is calculated as follows;

Vx = V cosθ

Vy = V sinθ

where;

Vx = 10 m/s  x  cos (15) = 9.66 m/s

Vy = 10 m/s x sin (15) = 2.59 m/s

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Answer:

Explanation:

The answer to that question is "both," though past players tend to have used heavier bats than do today's players. Baseball's "king of swat" Babe Ruth reportedly began his hitting career using a 54 ounce (1.5 kg) hickory bat, and is known to have used a 40oz bat in 1927 when he hit his 60 home runs.[1] Ty Cobb and Joe Di Maggio both played with 42oz bats and Rogers Hornsby used a 50oz piece of lumber. George Sisler, playing for the St. Louis Browns in the 1920's, made his bat heavier by hammering Victrola needles into the barrel of his bat.[2] In the 1950's Cincinnati Reds' Ted Kluszeski hammered tenpenny nails into his bat to make it heavier.

Other great hitters including Ted Williams, Rod Carew and Stan Musial used much lighter bats: 31-33oz.[1] Roger Maris used a 33oz bat to hit his 61 home runs in 1961. Many players have tried to make their bats lighter by drilling a hole in the barrel and filling it with cork. Detroit Tigers' Norm Cash admitted to using a corked bat in 1961 when he won the batting title with a .361 average (though he slumped to .243 the next year with the same corked bat).[2]

Kirkpatrick[3] reports that Roger Maris participated in a 1962 experiment in which he batted for distance with 5 different new bats whose weights varied from 33 to 47oz. He hit 5 long fly balls with each bat and the distances were measured and correlated to bat weight. The heavier bats, on average, resulted in further distance. However, Maris' preferred bat (which he used to break Babe Ruth's home run record) was the lightest of the set, even though it produced the shortest distance fly balls. Mark McGwire used a 35oz bat to hit his 70 home runs in 1998, and Barry Bonds used a 32oz bat to hit his 73 home runs in 2001. Most of today's major league players typically use 31-35oz bats.

Physicists have shown,[3,4] from a simple collision analysis, that the optimum bat weight is between 15 and 18oz. However, no professional batter uses a bat this light (in fact, you cannot make a wood bat this light). NCAA regulations[x] recently imposed a -3 rule (length in inches minus weigh in ounces cannot exceed 3) so that 34 inch bats must weigh 31oz. So far no such rule exists for Little League play, and -12 composite bats were introduced for the 2003 season. This brings us back to our original questions: which is better: heavier or lighter bats? So, what is the optimum bat weight, and what criteria influence this choice? Let's start by looking at the collision between ball and bat.

Experts concur that the current changes in Earth's climate cannot be primarily attributed to the solar cycle and its associated short-term variations in irradiance.

A huge magnet, but not a straightforward one, covers the entire Sun from North to South Pole. The magnetic fields of the Sun are constantly shifting, and the north and south magnetic poles alternate roughly every 11 years. The poles will reverse after 11 more years.

Total solar irradiance, the sum of all solar radiation, waxes and wanes in a semi-regular cycle by up to 0.15% between flips. The short-term variations in sun irradiance are not significant enough to affect Earth's climate over the long run.

The Earth's climate system may be impacted by sustained fluctuations in solar brightness, or changes that take place over decades or centuries.

Therefore, Experts concur that the current changes in Earth's climate cannot be primarily attributed to the solar cycle and its associated short-term variations in irradiance.

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Answer:

I believe it would be Pennsylvania and New Jersey they both border Maryland. Didn't see any other states that border Maryland with West Virginia and Virginia being exempt from the question.

Explanation:

Answer:  the correct answer is Maryland and Virginia

Explanation:  

Answer:

b

Explanation:

The Coriolis effect is a condition which causes a hurricane to rotate in a particular direction. Thus, the correct option is B.

Hurricanes are the enormous storms which come with a rotating wind speed of about 74 miles per hour. The rotating wind that swirls across the warm water of the tropics and also comes with a terrifying force.

The Coriolis force is an inertial or the fictitious force, which acts on the objects which are in motion within a frame of reference that rotates them with respect to an inertial frame. In a reference frame, with the clockwise rotation, the force acts to the left of the motion of the object. Whereas, in one with anticlockwise or counterclockwise rotation, the force acts to the right of the object. The deflection of an object due to this Coriolis force is called as the Coriolis effect.

Therefore, the correct option is B.

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The advantages of doing business globally include finding financing for a new business in other countries and bringing ideas for businesses in other countries to new markets.

Finding financing for a new business in other countries: Expanding business operations globally can provide access to a broader range of financing options. Different countries may have different financial systems and institutions that offer funding opportunities for entrepreneurs. This can be beneficial for startups or businesses looking to expand internationally.

Bringing ideas for businesses in other countries to new markets: Global business allows for the introduction of innovative ideas, products, and services from one country to new markets. By entering different markets, businesses can tap into new customer bases, increase their potential for growth, and diversify their revenue streams.

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Answer:

A parliamentary republic with a 3 tier system

Explanation:

The judiciary is independent, with everything operating in a parliementary republic. Legislative authority is held by the Parliament of South Africa.

A person jumps from an airplane and reaches terminal speed then he opens the parachute.

When the person approaches the terminal speed, he or she opens the parachute, which increases the surface area that air resistance can affect, the force of air resistance increases. The force of gravity was displaced as a result of air resistance. When the person approaches the terminal speed, he or she opens the parachute, which increases the surface area that air resistance can affect, the force of air resistance increases. The force of gravity was displaced as a result of air resistance. When this occurs, he begins to decelerate downward as acceleration stops. Due to the imbalance of the two forces acting on him, his speed will decrease.

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In non-restrictive clauses like a, commas may be used. You could also use parentheses and dashes.

A nonrestrictive clause provides additional information about something you have already mentioned in a sentence, but the information is not necessary to understand what you are referring to. Nonrestrictive clauses are typically introduced by which or who and are separated by commas.

An additional bit of information is provided by a nonrestrictive clause. When referring to a special person, thing, or event, it is typically a proper noun or a common noun. The additional information is indicated by the use of commas.

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Dimensioning is a method used to specify an object's size and the placement of various design elements. So skill related to dimensioning a drawing help us to show the shape of the designs, and use various types of lines to show the drawing's features.

It's critical to comprehend the guidelines and tenets of size description, often known as dimensioning. Sizes are expressed in either metric (SI) or U.S. customary units.A drawing must tell two complete tales in order to be complete and allow for the creation of the object it depicts in accordance with the designer's intentions. This is conveyed through views, which give a description of the object's shape, as well as through dimensions and notes, which provide measurements and other details necessary to create the thing.

So, the next thing you need do is study the fundamentals of dimensioning. By doing so, you will learn how to dimension your sketches so that they may be utilised to convey size information to others. You will also learn how to read a drawing to gain the information you need.

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Answer:

There is no motion of the charge except along the axis of the ring.

(All charges on the ring are equivalent, with no net force perpendicular to the axis of the ring)

The electric potential of the axis of the ring decreases as the charge is moved away from the center of the ring,

The force on the negative charge will always be directed towards the center of the ring. (It would take work to move the charge "away" from the ring)

Answer:

First, convert 850.0 m^2 to cm^2 to match the volume of oil. It would come out to 8,500,000 cm^2. Now set up V=lwh (length times width times height). You are looking for thickness, which is height.

1000.0cm^3 = (8.500*10^6 cm^2)(h)

1000.0/(8.500*10^6) = h

Explanation: I hope this help :)

The expression for the terminal speed, \(V_{term\), can be given by:

\(V_{term\) = sqrt((2 * g * (rhor - rhom)) / (b * rhor))

The expression for the terminal speed (\(V_{term\)) can be derived by considering the forces acting on the object at terminal velocity.

At this point, the gravitational force (mg) and the drag force (F_drag) balance each other out.

The drag force is proportional to the velocity (v) of the object,

and its equation can be written as F_drag = -b * v, where b is the drag coefficient.

By equating the gravitational force and drag force,

we obtain b * \(V_{term\) = m * g.

Considering the object's mass (m) as the product of its density (ρ) and volume (V), and simplifying the equation,

we arrive at \(V_{term\) = sqrt((2 * g * (rhor - rhom)) / (b * rhor)),

where rhor is the density of the medium and rhom is the object's density.

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Terminal speed refers to the maximum velocity achieved by an object when the forces acting on it balance out. In this case, we can use the formula for terminal speed to find an expression in terms of the given variables.

The formula for terminal speed is: v = \(\sqrt{((2mg) / (rhor * A * C))}\), Where v is the terminal speed, m is the mass of the object, g is the acceleration due to gravity, rhor is the density of the surrounding medium, A is the cross-sectional area of the object, and C is the drag coefficient. In this case, we can assume that the object is a sphere with density rhom. Therefore, the mass of the object can be expressed as: m = (4/3) * pi * \(r^{3}\) * rhom. where r is the radius of the sphere. The cross-sectional area of the sphere can be expressed as: A = pi * \(r^{2}\). The drag coefficient can be expressed as: C = 6 * pi * b. where b is a constant that depends on the shape of the object and the properties of the surrounding medium. Substituting these expressions into the formula for terminal speed, we get: v = \(\sqrt{((8/3) * (rhom - rhor) * g * r^{3}) / b}\). Therefore, the expression for terminal speed in terms of the given variables is: v = \(\sqrt{((8/3) * (rhom - rhor) * g * r^{3}) / (6 * pi * b)}\)

In summary, we can use the formula for terminal speed to find an expression in terms of the given variables. The expression for terminal speed can be derived by substituting the expressions for mass, cross-sectional area, and drag coefficient into the formula for terminal speed. The resulting expression involves the variables b, rhor, rhom, and the constant g. The formula can be used to calculate the terminal speed of a sphere in a given medium.

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The speed of the spaceship is 0.099c.

Speed is the fastest movement of something.

Given:

L = 30 m is the proper length of the ship

• Delta*L = 13.8cm = 0.13m is the change in length

Let us first determine our contracted length. We can do this by subtraction:

L = 30m - 0.13m

We get:

L = 29.87

Now to determine the speed of the ship, we use the length contraction equation:

L = L_{0} * √(1 - (v ^ 2)/(c ^ 2))

We isolate the square root term:

√(1 - (v ^ 2)/(c ^ 2)) = L/L_{0} To simplify calculations, let us first substitute our lengths:

√(1 - (v ^ 2)/(c ^ 2)) = (29.87/(30) =

= 0.995

After calculation

V/C = 0.099874

Or V= 0.099c

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Answer:

B. temperature of the objects

A collision which is inelastic is one in which the internal energy changes.

All the kinetic energy is dissipated

Reasons:

The given parameters are;

The mass of one car = The mass of the second car in the collision = m

The type of collision = Inelastic collision

The speed of each of the cars in the collision = v and -v

Solution:

In an inelastic collision, we have;

\(m_1 \cdot v_{1i} + m_2 \cdot v_{2i} = (m_1 + m_2) \cdot v_f\)

Therefore, we get;

\(m \cdot v_{i} -m \cdot v_{i} = 0= 2 \cdot m \cdot v_f\)

Which gives;

\(v_f = 0\)

The collision is an example of a perfectly inelastic collision, and the final velocity after the collision is zero.

The change in the energy is \(\Delta K.E. = K.E._{final} - K.E._{initial}\)

\(K.E._{initial}\) = 0.5·m·v² + 0.5·m·v² = m·v²

ΔK.E. = 0.5·(2·m)×0 - 0.5·m·v² + 0.5·m·v² = -m·v²

ΔK.E. = -m·v²

The negative sign stands for energy given out, which gives;

The energy dissipated = m·v² (The total initial kinetic energy)

Therefore, all the kinetic energy is dissipated

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If the image formed by the spherical mirror is real, we can use the mirror equation and magnification formula to find the radius of curvature of the mirror,

the height of the image, and determine whether the image is upright or inverted.

The mirror equation is given by:

1/f = 1/v - 1/u

Where:

f is the focal length of the mirror,

v is the image distance (distance of the image from the mirror),

u is the object distance (distance of the object from the mirror).

The magnification formula is given by:

magnification = height of the image / height of the object = -v/u

Given:

Height of the object (h) = 3.20 mm = 0.32 cm

Object distance (u) = 20.0 cm

Image distance (v) = -60.0 cm (negative sign indicates that the image is formed on the opposite side of the object)

Let's calculate the radius of curvature (R) first:

Using the mirror equation, we have:

1/f = 1/v - 1/u

1/f = 1/(-60.0 cm) - 1/20.0 cm

1/f = -1/60.0 cm - 1/20.0 cm

1/f = (-3 - 9)/180.0 cm

1/f = -12/180.0 cm

f = -180.0 cm / 12

f = -15.0 cm

The radius of curvature (R) is twice the focal length, so:

R = 2 * f

R = 2 * (-15.0 cm)

R = -30.0 cm

The height of the image (h') can be calculated using the magnification formula:

magnification = h' / h

-60.0 cm / 20.0 cm = h' / 0.32 cm

-3 = h' / 0.32 cm

h' = -3 * 0.32 cm

h' = -0.96 cm

The negative value for the magnification indicates that the image is inverted.

Therefore, for the case where the image is real:

The radius of curvature of the mirror is -30.0 cm (concave mirror).

The height of the image is -0.96 cm.

The image is inverted.

(b) For the case where the image is virtual, we can use the same formulas to find the radius of curvature, height of the image, and determine its orientation.

Height of the object (h) = 3.20 mm = 0.32 cm

Object distance (u) = 20.0 cm

Image distance (v) = +60.0 cm (positive sign indicates that the image is formed on the same side as the object)

Using the mirror equation:

1/f = 1/v - 1/u

1/f = 1/60.0 cm - 1/20.0 cm

1/f = (3 - 9)/180.0 cm

1/f = -6/180.0 cm

f = -180.0 cm / -6

f = 30.0 cm

The radius of curvature (R) is twice the focal length:

R = 2 * f

R = 2 * 30.0 cm

R = 60.0 cm

Using the magnification formula:

magnification = h' / h

+60.0 cm / 20.0 cm = h' / 0.32 cm

3 = h' / 0.32 cm

h' = 3 * 0.32 cm

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Answer:

392 Newtons

Explanation:

In order to find the weight, you have to multiply the mass by the gravitation constant (9.8), which gives us 40.0 * 9.8 = 392 Newtons.

Answer:

B, A, C

Explanation:

The momentum is equal to the mass times the velocity, so for each car the momentum is equal to

Car A

Momentum = Mass x Velocity

Momentum = 1,500 kg x 10 m/s

Momentum = 15,000 kg m/s

Car B

Momentum = Mass x Velocity

Momentum = 1,500 kg x 25 m/s

Momentum = 37,500 kg m/s

Car C

Momentum = Mass x Velocity

Momentum = 1,000 kg x 10 m/s

Momentum = 10,000 kg m/s

Then, the decreasing momentum is B, A, C because

37,500 is greater than 15,000 and 15,000 is greater than 10,000

So, the answer:

B, A, C

Answer:

Cardiovascular or cardio exercise refers to exercise that strengthens the cardiovascular system. The term Aerobic just means in the presence of oxygen, and aerobic exercise refers to exercise that you perform long enough to require oxygen.

Answer: Exothermic

Explanation:

An exothermic reaction causes an increase in temperature. This is because the energy released when the bonds are broken among the reactants is greater than than the energy absorbed when new bonds are formed among the products. This leftover energy gets passed along to the surroundings, where it produces a measurable increase in heat.

Answer:

Explanation:

Less than 45!

The angle that the string will make horizontally while Kinetic Energy and Potential Energy being equal of the sphere-Earth system would be:

C). Less than 45°

Given that,

Gravitational potential energy = 0

Mass = negligible

Since the body is released from the state of rest and the sphere is present its lowest point, the angle(θ) that it creates would be :

\(mgh =\) \(\frac{1}{2} mv^2\)                       (\(v = L,\) θ)

θ = less than 45°.

θ < 45°

Thus, option C is the correct answer.

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The best way to describe sound levels is through a ratio scale.

The decibel scale, which measures sound levels, is best described as a ratio scale. While the decibel scale is logarithmic, it can be transformed into a linear ratio scale by using a reference point. By selecting a reference point as the softest sound the human ear can hear unaided (0 dB), we establish a meaningful zero point on the scale. Any sound level above this reference point can be expressed as a positive value, indicating its magnitude relative to the softest audible sound. The logarithmic nature of the decibel scale still holds, with each increase of 10 dB representing a tenfold increase in sound intensity. However, by anchoring the scale to a fixed reference point, we can now quantify and compare sound levels in a meaningful way, making it a ratio scale.

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Answer:

F= 1800N

Explanation:

the equation for force is F= ma

so plug in the numbers: F= (120)(15)

solve this to get F= 1800N

tip: don't forget to add the units when writing your answer :)

When you are working on a magnetic levitation experiment in a lab and beta radiation is emitted directly at you, passing through the magnets first, you are not safe because it was beta radiation and very dangerous.

The correct answer is option a.

Beta radation is a form of ionizing radiation that is made up of high-energy beta particles. Beta particles are high-energy, high-speed electrons or positrons that are emitted by certain radioactive isotopes. The emission of beta radiation from radioactive materials is referred to as beta decay.

Beta particles, unlike alpha particles, have a longer range and can penetrate through paper, skin, and other low-density materials but can be blocked by high-density materials.

Therefore, option a is correct.

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ANSWER:

(a) 108 J

(b) 0 J

(c) 108 J

STEP-BY-STEP EXPLANATION:

(a)

Express the relation between horizontal component of work done and force on the crate:

Here Wh is the horizontal component of the work done on the crate and Fh is the horizontal component of force and d is the distance of the crate across the floor.

Replacing:

(b)

Express the relation between vertical component of work done and force on the crate:

Here Wv is the vertical component of the work done on the crate and Fv is the vertical component of force and d is the distance of the crate across the floor.

Replacing:

(c)

Express the relation for total work done by the 45 N force:

Answer:

C. amount of charge on the source charge.

Explanation:

Electric field lines can be defined as a graphical representation of the vector field or electric field.

Basically, it was first introduced by Michael Faraday and it is typically a curve drawn to the tangent of a point is in the direction of the net field acting on each point.

The number, or density, of field lines on a source charge indicate the amount of charge on the source charge. Therefore, the density of field lines on a source charge is directly proportional to quantity of charge on the source.

Answer:

there is six ways the top three cars can finish the race

The friction force is static since there is no relative motion between the shoe and the ground. The friction force, if any, is the static force of friction if there is no relative motion between the objects in contact (FS). An illustration would be a box that sits motionless on a ramp.

A force that holds an object at rest is called static friction. The following is a definition of static friction:

the resistance people feel when they try to move something that is stationary on a surface without actually moving their bodies or the surface they are trying to move it on.

It can be explained as the frictional force that perfectly balances the applied force throughout the body's stationary state.

The static frictional force is self-regulating, meaning that it will always be equal to and the opposite of the applied force.

Friction is the force that prevents an object from moving in the direction it is sliding along a surface, therefore it acts in the opposite direction. But a friction force can be felt even when an object is not moving.

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