A wrestler brings a barbell down to his chest as he bench presses 90 kg. If the barbell accelerates downward at a rate of 2.69 m/s^2 , what is the force exerted by the wrestler on the weights?

A mass suspended from spring is oscillating up and down in simple harmonic motion, then : Option (i) is correct.

In simple harmonic motion, velocity of the mass is zero at the extreme positions of its oscillation, but acceleration is not zero. Acceleration is maximum at the extreme positions, where the velocity is zero, and it is directed towards the equilibrium position.

Simple harmonic motion is the repetitive movement back and forth through an equilibrium, or central, position, so that maximum displacement on one side of this position is equal to maximum displacement on the other side.

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Answer:

The new pressure will be 12 atm

Answer:

gravity

Explanation:

if a Venus sized object is orbiting a star and a two neptune sized objects are orbiting closely the will pull and yank on the venus sized object heating it up and the star will pull back on the other panlets heating the insides of the planet (take io as an example)

Hope you could understand.

If you have any query, feel free to ask.

There are no immediate substitutes for gasoline as public transportation is often limited and walking, biking, or taking a cab is not always feasible. Therefore, people may continue to purchase gasoline despite an increase in price.

One item that is common in our society that I believe is elastic is fast food. Elasticity is the degree to which changes in price affect demand for a good or service.

Fast food is elastic because it has many substitutes such as restaurants, home-cooked meals, and even other fast-food chains. Fast food is also highly responsive to price changes, which means that a small change in price can cause a large change in demand.

For example, a $1 price increase for a burger meal at a fast-food chain might cause many people to switch to a competitor with a cheaper price. Thus, fast food is an elastic product in our society.One item that is common in our society that I believe is inelastic is gasoline.

Gasoline is an inelastic product because it has few substitutes and people need it for transportation. If the price of gasoline increases, people may continue to purchase it even if it means spending more money because there are few alternative options.

Additionally, there are no immediate substitutes for gasoline as public transportation is often limited and walking, biking, or taking a cab is not always feasible.

Therefore, people may continue to purchase gasoline despite an increase in price.

For example, if the price of gasoline increases by $1, a consumer will still purchase gasoline because they require it to get to work or school. Thus, gasoline is an inelastic product in our society.

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One item in our society that I believe is elastic is the price of gasoline  because of  various alternatives to gasoline and the proportion of income spent. An item in our society that I believe is inelastic is medical treatment because of the necessity of medical treatment and lack of substitutes.

Firstly, the availability of substitutes contributes to the elasticity of gasoline. In our society, there are various alternatives to gasoline, such as electric vehicles or public transportation. When the price of gasoline increases, consumers have the option to switch to these substitutes, reducing their demand for gasoline. Conversely, when the price of gasoline decreases, consumers may choose to drive more or purchase larger vehicles, increasing their demand for gasoline. This flexibility in consumer choices demonstrates the elasticity of gasoline.

Secondly, the proportion of income spent on the product also influences the elasticity of gasoline. For many individuals, the cost of gasoline represents a significant portion of their overall budget. When the price of gasoline rises, consumers may have to make adjustments to their spending habits or seek alternative means of transportation to cope with the higher expenses. Conversely, when the price of gasoline decreases, consumers may have more disposable income to spend on other goods and services. This sensitivity to price changes further supports the elasticity of gasoline.

On the other hand, an item in our society that I believe is inelastic is medical treatment. Two determinants of elasticity that contribute to this belief are the necessity of the product and the lack of substitutes.

Firstly, the necessity of medical treatment makes it an inelastic product. When individuals require medical treatment, they often have no choice but to seek the necessary healthcare services regardless of the price. This is especially true for life-saving procedures or medications. The demand for medical treatment is driven by the urgency and importance of preserving one's health, which leads to a less responsive consumer behavior to price changes.

Secondly, the lack of substitutes also contributes to the inelasticity of medical treatment. In many cases, there are limited alternatives or substitutes available for specific medical treatments. For example, if a person requires a specific surgery or medication to treat a condition, they cannot easily switch to a different treatment option to lower their expenses. The lack of viable substitutes reduces consumer choice and makes the demand for medical treatment less responsive to changes in price.

In summary, the price of gasoline is elastic due to the availability of substitutes and the proportion of income spent on the product. On the other hand, medical treatment is inelastic due to its necessity and the lack of substitutes. These determinants of elasticity highlight the different levels of responsiveness to price changes in these two common items in our society.

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Given

The concept of inertia forms the basis for Newton's Third Law of Motion

To find

The given statement is true or false

Explanation

The third law of motion states that every action has a equal and opposite reaction

Inertia is the property by virtue of which an object at rest tends to be at rest and object at motion tends to be at motion

Thus both the concept are not similar

Conclusion

The given statement is false

Answer: 9.05 s

v = 3 m/s

u = 22 m/s

Deceleration = 2.1 m/s^2

∴ 3 = 22 - 2.1 ( t )

∴ t = 9 .05 s

CR​ < CY​ < CB​

The factors which affect the critical angle are

(a) The colour (or wavelength) of light

(b) The temperature

(i) Effect of colour of light: The critical angle for a pair of media is less for the violet light and more for the red light. Thus the critical angle increases with the increase in wavelength of light.

(ii) Effect of temperature: The critical angle increases with increase in temperature because on increasing temperature of medium, its refractive index decreases.

According to the question,

μ 1​ sinCR​ =1

μ 2​ sinCY =1

μ 3​ sinCB​ =1

μ 1​ > μ 2​  and μ 2​ > μ 3

⟹μ 1​ > μ 2​ > μ 3

CR​ < CY​ < CB​

Thus,

The critical angle increases with the increase in wavelength of light.

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Suppose a soccer player kicks the ball from a distance 27 m toward the goal. Find the initial speed of the ball if it just passes over the goal, 2.4.The given details in the problem are:Distance covered by the ball, S = 27 mHeight of the goal, h = 2.4 mInitially, the ball is at ground level. Therefore, the initial height of the ball, u = 0 m.

Let us consider the following formula: `h = u sin (θ) t - (1/2) g t^2`Where,h = height reached by the ballu = initial velocityθ = angle of projectionsin (θ) = sine of the angle of projectiont = time taken by the ball to reach the maximum heightg = acceleration due to gravity = 9.8 m/s^2The ball is projected from the ground. Therefore, the final height of the ball, h = 2.4 m.Substituting the given values, we get:2.4 = 0 sin (θ) t - (1/2) × 9.8 t^2Simplifying the above equation, we get:4.9 t^2 = 2.4t = `sqrt (2.4 / 4.9)`≈ 0.631 sNow, we will find the initial velocity of the ball by using the following formula:

`S = u cos (θ) t`Where,S = distance travelled by the ballu = initial velocityθ = angle of projectioncos (θ) = cosine of the angle of projectiont = time taken by the ball to travel the distance SSubstituting the given values, we get:27 = u cos (θ) × 0.631 u = `27 / (0.631 cos θ)`Now, we know that the ball just passes over the goal. Therefore, the height of the ball when it reaches the goalpost, h = 0 m.

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gas is the answer for this question

can you make me a brainlist

The answer that matches both trials is (A) Does not change - Does not change.

The speed of the two-cart system's center of mass during the collision in each trial can be analyzed using the principle of conservation of momentum. In both trials, the total momentum before and after the collision remains the same.
In Trial 1, the collision is elastic, meaning that both kinetic energy and momentum are conserved. The center of mass does not change during the collision since the total momentum remains constant. Therefore, for Trial 1, the correct answer is "Does not change."
In Trial 2, the carts stick together during the collision, and although kinetic energy is not conserved, the total momentum is still conserved. As a result, the center of mass of the two-cart system does not change during the collision.

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Answer:

I believe D on edge

Explanation:

The  statement  she should place in the region marked X is the objects have the same charge.

A Venn diagram is a diagram that is composed of a square in which circles are inscribed. It can be used to easily represent information.

From the Venn diagram shown, the  statement  she should place in the region marked X is the objects have the same charge. This is because, the region marked x in the Venn diagram shows the intersection which can not be oppositely charged or objects that do not touch.

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Answer: From What i Seeing it is Option B

Answer:

once

Explanation:

the earth orbits the sun fully once a year.

Car A's frequency is determined to be 398.4 Hz.

The frequency heard by car A is calculated using the following equation.

f = fs(v - v₀) / (v - vs)

where;

v is the speed of sound = 343 m/s

v₀ is the speed car B = 19.2 m/s

vs is the speed of car A = 22 m/s

fs is the frequency of car A = 395 Hz

f is the frequency of car B = ?

f = 395(343 - 19.2) / (343 - 22)

The frequency will be calculated as below,

f = 395(1.0087)

f = 398.4 Hz

Therefore, car A's frequency is determined to be 398.4 Hz.

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The sartorius muscle is the solution. A superficial muscle that runs the full length of the leg, the sartorius is involved in the flexion of the knee and hip.

The heart's wall is made up of cardiac muscle, which also causes the heart to contract vigorously. Intestinal, uterine, blood vessel, and internal ocular muscles are all made of smooth muscles.

The epidermis and some skeletal muscles are linked to the bones (muscles in our face). The skeletal muscles' contraction aids in the movement of the limbs and other bodily parts.

Although some estimates go as high as 840, the majority of sources claim that there are over 650 identified skeletal muscles in the human body.

Therefore, The sartorius muscle is the solution. A superficial muscle that runs the full length of the leg, the sartorius is involved in the flexion of the knee and hip.

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(1) The magnitude of the force that maintains circular motion acting on the puck is 14.7 N.

(2) The linear speed of the puck is 29.35 m/s.

The given parameters:

The magnitude of the force that maintains circular motion acting on the puck;

\(F = \frac{m_1 v^2}{r}\)

The tension on the string due to the suspended masse is calculated as follows;

\(T = m_2 g\)

Since the two masses are in equilibrium;

\(\frac{m_1 v^2}{r} = m_2g\\\\m_1v^2 = m_2g r\\\\v^2 = \frac{m_2g r}{m_1} \\\\v= \sqrt{\frac{m_2g r}{m_1} } \\\\v = \sqrt{\frac{1.5 \times 9.8 \times 1.7}{0.029} } \\\\v = 29. 35 \ m/s\)

The magnitude of the force that maintains circular motion acting on the puck;

\(F = \frac{m_1v^2}{r} \\\\F = \frac{0.029 \times (29.35)^2}{1.7} \\\\F = 14.7 \ N\)

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Answer:

v=\(\frac{S}{t}\) = 1.43 miles/hour

2500 ft = 0.473 miles

20 min = 0.33 hour

Explanation:

The definition of speed allows you to find the answer for the speed of the scooter is:

          v = 1.42 mi / h

The velocity of a body is defined as the change in position between the time of the interval

         \(v = \frac{\Delta x}{t}\)

Where v is the velocity, Δx the change in position and t the time

They indicate that the distance is Δx = 2500 ft and the time is t = 20 min, we look for the velocity

          v = \(\frac{2500}{20}\)

          v = 125 ft / min

In the problem they indicate that the answer is given in miles per hour, let's reduce the units

       v = 125 ft / min (\(\frac{1 mile}{5280 ft}\))  (\(\frac{60min}{1h}\))

       v = 1.42 mi / h

In conclusion using the definition of speed we can find the answer for the speed of the scooter is:

          v = 1.42 mi / h

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the distance between the two twin space probes is 4.04 × 1010 meters.

The distance between the two twin space probes can be calculated by using the formula of Gravitational Force.

The formula for Gravitational Force is:

F = G * (m1 * m2 / d^2)Where, F is the Gravitational Force, G is the Gravitational Constant (6.67408 × 10-11 N m2/kg2), m1 and m2 are the masses of the two objects and d is the distance between them.

In the given problem, the masses of the two twin space probes is given to be 722 kg each.

The gravitational force between the two space probes is 8.61 × 10–16 N. We can find the distance between them using the formula of Gravitational Force.

so, substituting the given values in the above formula we get:

F = G * (m1 * m2 / d^2)8.61 × 10–16 N = 6.67408 × 10-11 N m2/kg2 * (722 kg)2 / d^2

Solving this equation for d, we get:

d = √[(G * m1 * m2) / F]

= √[(6.67408 × 10-11 N m2/kg2 * 722 kg * 722 kg) / 8.61 × 10–16 N]

= 4.04 × 1010 meters

Therefore, the distance between the two twin space probes is 4.04 × 1010 meters.

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The power P supplied to a resistor whose resistance is R when it is known that it has a current I flowing through it is given by P = I²R.

A resistor is a passive two-terminal electrical component used in circuits to implement electrical resistance. Resistors have a variety of purposes in electronic circuits, including lowering current flow, adjusting signal levels, dividing voltages, biassing active components, and terminating transmission lines.

In an electrical circuit, power is given by the product of the current and the voltage drop. This voltage drop is proportional to the resistance of the circuit. The power P supplied to a resistor whose resistance is R when it is known that it has a current I flowing through it is given by P = I²R. The unit of power is watts (W).

Therefore, the power P supplied to a resistor whose resistance is R when it is known that it has a current I flowing through it is given by P = I²R.

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1. Heat from when Earth was formed.

2. Frictional Heat, which is caused by heavier core material sinking to the center of the Earth.

3. Heat from the decay of elements that are radioactive.

Answer:

Frictional force will be 150N

Answer:

In a cardio kickboxing class, you will learn proper form for the famous jab, hooks,crosses, uppercuts, back kicks, front kicks.

Explanation:

Acidity is indicated by pH values lower than 7, while baseness is shown by pH values higher than 7. The pH of water is actually a measurement of the proportion of free ions of hydrogen and hydroxyl that are in the solution.

The souls were shown by him. He pointed to the nicely arranged clothing on the nightstand next to the bed. They still lacked one goat, according to a hasty count.

The monitored value from the a transaction file that the monitor reported for a known amount of the specified Parameter. Precision is determined by comparing this value to the known quantity known as REAL VALUE.

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Approximately 7.5679 x 10^11 photons are emitted in this pulse of a ruby laser with a wavelength of 694.3 nm, an average power of 50 mW, and a duration of 4.6 ns.

To calculate the number of photons emitted in the pulse, we can use the formula:

Number of photons = (Average power of the pulse) / (Energy per photon)

First, let's calculate the energy per photon using the formula:

Energy per photon = Planck's constant (h) x Speed of light (c) / Wavelength

Given:

Wavelength (λ) = 694.3 nm = 694.3 x 10^-9 m

Average power = 50 mW = 50 x 10^-3 W

The Planck's constant (h) is approximately 6.626 x 10^-34 J·s, and the speed of light (c) is approximately 3 x 10^8 m/s.

Calculating the energy per photon:

Energy per photon = (6.626 x 10^-34 J·s) x (3 x 10^8 m/s) / (694.3 x 10^-9 m)

Now, we can calculate the number of photons using the formula mentioned earlier:

Number of photons = (Average power of the pulse) / (Energy per photon)

Substituting the values:

Number of photons = (50 x 10^-3 W) / [(6.626 x 10^-34 J·s) x (3 x 10^8 m/s) / (694.3 x 10^-9 m)]

Number of photons ≈ 7.5679 x 10^11 photons

Approximately 7.5679 x 10^11 photons are emitted in this pulse of a ruby laser with a wavelength of 694.3 nm, an average power of 50 mW, and a duration of 4.6 ns.

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Answer:

a) Strings of guitar (being played)

b) Heart-beat in a healthy person

c) Motion of an apple falling from a tree

Explanation:

a) The motion of the string of a guitar being played is the only motion involving simple harmonic motion.

b) All the other motions are circular motion except the heart beat in a healthy person, which is periodic.

c) The motion of an apply falling from a tree is the only motion under the complete influence of gravity from the onset till the end.

Speed = Wavelength * Frequency

Answer:

Qualitative, Quantitative, Qualitative, Quantitative, and Qualitative.

Explanation:

\(\qquad\qquad\huge\underline{{\sf Answer}}♨\)

Here we go ~

❖ Qualitative data determines the property or characteristics of certain object or behavior.

❖ Quantitative data determines the number or quantity of a substance. basically dealing with how much/many things are being used.

Now let's move on to questions ~

#1. Carbon is a organic molecule.

- Qualitative

#2. The forest is 25% oak trees.

- Quantitative

#3. Water contains covalent bonds.

- Qualitative

#4. Sheila's blood pressure is 120/80.

- Quantitative

#5. The bat arm and human arm have similar bone structure

- Qualitative

When the plane is about to land the volume of the pillow after landing will be 4.26 L.

At a cruising altitude of 10 km, the atmospheric pressure is less than 0.3 atm, but the cabin pressure is maintained at 0.75 atm.

Since the travel pillow is inflatable, we can assume that its initial volume at sea level is negligible. Therefore, we can use the ideal gas law to determine the volume of the pillow after landing.

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Initially, the pressure inside the pillow is 0.75 atm, and the temperature is the same as the cabin temperature.

When the pillow is inflated at cruising altitude, the pressure inside the pillow is also 0.3 atm, and the temperature is lower than the cabin temperature due to the adiabatic expansion of the air inside the pillow.

However, since we are ignoring the elasticity of the pillow's material, we can assume that the number of moles of air inside the pillow remains constant.

Therefore, using the ideal gas law for both initial and final conditions, we have:

P1V1 = nRT1 and P2V2 = nRT2

where subscripts 1 and 2 denote initial and final conditions, respectively.

Solving for V2, we get:

V2 = (P1V1T2)/(P2T1)

Substituting the values, we get:

V2 = (0.75 atm)(1.7 L)(216.65 K)/(0.3 atm)(288.15 K) = 4.26 L

Therefore, the volume of the travel pillow after landing is 4.26 L.

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