With all his gear, Neil Armstrong weighed 360 pounds on Earth. When he landed on the Moon, he weighed 60 pounds. Why?

The power that can be produced when the energy in a cup of ice cream is expended over a period of 10 minutes is approximately 1,394.67 watts or 1.87 horsepower.

To calculate the power that can be produced when the energy in a cup of ice cream is expended over a period of 10 minutes, we need to convert the energy from kilojoules (kJ) to joules (J). Given that each food Calorie is equal to 4,184 joules, a half-cup of ice cream contains about 836,800 joules (200 Calories × 4,184 joules/Calorie).

Next, we need to calculate the power. Power is calculated by dividing the energy by the time. So, the power that can be produced when the energy in a cup of ice cream is expended over a period of 10 minutes (600 seconds) is 1,394.67 watts (836,800 joules ÷ 600 seconds).

To convert the power from watts to horsepower, we need to divide the power by 745.7 (1 horsepower = 745.7 watts). Therefore, the power can be converted to approximately 1.87 horsepower (1,394.67 watts ÷ 745.7).

By definition, of the law of ohm, we have to:

[tex] V = I * R
[/tex]

Where,

V: voltage

I: current

R: resistance

Therefore, we have that the relationship between voltage and current is proportional.

The proportionality constant for this case is the resistance.

For the current we have:

[tex] I = \frac{V}{R}
[/tex]

The proportionality constant for this case is the inverse of the resistance.

Answer:

A statement that describes the relationship of voltage and current is:

Voltage is directly proportional to current because I = V / R

Answer:

100 plus charges

Explanation:

A neutral charge is the one that it's not positive (plus sign) neither negative(minus sign), it is 0. So, if there is a -100 charge, to the total charge be neutral, it's necessary to add a positive charge at the same amount, which would be +100.

Answer:

C nutcracker

Explanation:

A nutcracker is an example of a lever, which belongs to the second -class levers. It has the fulcrum at one end and the effort at the opposite end with the load i.e the nut at its middle. another example is a wheelbarrow.

Answer:[tex]510. 12 cm^3[/tex]

The volume of a cylindrical conduit, [tex]V=\pi (r_2^2-r_1^2) h[/tex]

where [tex]r_1[/tex] is the inner radius, [tex]r_2[/tex] is the outer radius, h is the length.

First of all, we would covert each parameter into centimeters.

length of the conduit, [tex] h=4 ft=4\times 30.48 cm=121.92 cm[/tex]

outer radius, [tex]r_1=2.2/2 in =1.1 in= 1.1\times 2.54 cm=2.79 cm[/tex]

inner radius, [tex]r_1=2/2 in =1 in= 2.54 cm[/tex]

Insert the values in the volume formula,

[tex]V=3.14 \times (2.79^2-2.54^2) \times 121.92 cm^3=510. 12 cm^3[/tex]

Hence, the volume of metal in the conduit is 510. 12 cubic centimeters.

Answer:

c)have insulator and conductor properties.

Explanation:

Semiconductors, as the name suggest have properties of both insulators and conductors. Until the current/voltage applied to them reaches a particular threshold they work like an insulator. Once the threshold is crossed they behave like a conductor. This property makes them very useful in electronic devices. In fact almost all the electronic equipment in today's age use semiconductors in some way or the other.

Answer:

B. most gets converted to heat energy

Explanation:

Let us take the example of a car. Though some formula one cars have 50% efficiency, the efficiency of an internal combustion car varies between 18–20%. Though some formula one cars have 50% efficiency This means that more than 80% of energy is not utilized hence it is wasted. Little energy does get converted to sound. But almost no energy changes to light.

So, most gets converted to heat energy.

Answer: detonation

detonation

According to Hooke's Law, the distance when a spring is stretched by a hanging object varies directly as the weight of the object. We can use this information to find the distance when the weight is 7 kg. We get 84 cm.

Hooke's Law states that the distance d when a spring is stretched by a hanging object varies directly as the weight w of the object.

This means that if you double the weight, the distance will also double.

Mathematically, we can express this relationship as d = kw, where k is the constant of variation.

To find the value of k, we can use the given information: when the weight is 3 kg, the distance is 38 cm.

Plugging these values into the equation, we get 38 = 3k.

Solving for k, we divide both sides by 3 to get k = 12.

Now, we can find the distance when the weight is 7 kg by plugging this value into the equation: d = 12 * 7 = 84 cm.

Using the principle of conservation of angular momentum, we can calculate the final angular velocity of the wheel. The equation for finding this involves the moment of inertia, initial angular velocity, angular acceleration and time.

The final rotational speed of the wheel can be determined through the principles of angular momentum and laws of physics involving rotational motion.

We first find the angular velocity using the equation for conservation of angular momentum, which is given by Linitial = Lfinal where L represents angular momentum. This will involve the moments of inertia and initial angular velocity.

Next, we apply our knowledge of the equation wf = wi + αt, where wf represents the final angular velocity, α stands for angular acceleration and t signifies time. Since the string has been pulled through a certain distance after time 'tl', with t denoting time and 'l' represents the length of string, you can calculate the final angular velocity of the wheel through these variables.

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Final answer:

The final rotational speed (ωfinal) of a wheel after a string is pulled can be found using the conservation of angular momentum, assuming no external torques are present.

Explanation:

The question involves finding the final rotational speed (ωfinal) of a wheel given that a string has been pulled through a distance l after a certain time tl. To answer this, we would need to apply the principles of conservation of angular momentum, assuming there are no external torques acting on the system. The initial angular momentum can be expressed as Linitial = Iinitial ωinitial, and the final angular momentum as Lfinal = Ifinal ωfinal. If the string is wound around the wheel, pulling it would likely change the wheel's moment of inertia. Therefore, to find ωfinal without external torques, we would set Linitial equal to Lfinal and solve for ωfinal.

The force required to accelerate a 0.75 kg ball at a rate of 25 m/s^2 is approximately 19 newtons, calculated using Newton's second law of motion.

To calculate the required force to make the ball accelerate at the given rate, we need to use Newton's second law of motion, which states that the force applied on an object is equal to its mass times its acceleration (F=ma). To find the force, we multiply the mass of the ball (0.75 kg) by the acceleration (25 m/s^2).

This gives us a force of 18.75 newtons. None of the provided options match this exact answer; the closest option is B. 19 newtons, so we would select this as the best answer with the understanding that it has been rounded.

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Answer:

Option (b)

Explanation:

A nuclear reactor is a set up in which nuclear fission takes place and then the energy released is used to generate electrical energy.

Initially the nuclear energy is released by the fission of Uranium or reactor fuel.

Now, this nuclear energy is used to heat the water, then the energy from the hot water or steam is used to rotate the turbine, finally the turbine rotate and the electrical energy is generated by the generator.

So, the correct sequence is

nuclear energy - thermal energy - mechanical energy - electrical energy

Nuclear energy- thermal energy- mechanical energy-electrical energy.

The total amount of energy in the universe has never changed and will never change because it cannot be created or destroyed. This does not imply that energy cannot change forms or even move between objects though; it does.

Kinetic energy, or the energy attributed to motion, can be transferred from a moving item to a stationary object by means of effort, which is a frequent example of energy transfer that we experience in everyday life.

A portion of the kinetic energy in the club is transferred to the golf ball when it is struck by a stationary golf ball due to the "work" the club does on the ball.

Therefore, Nuclear energy- thermal energy- mechanical energy-electrical energy.

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The momentum of the object-Earth system remains the same as the object falls. The recoil of the Earth is negligible but present, ensuring conservation of momentum within the closed system.

As an object falls freely toward the Earth, the momentum of the object-Earth system remains the same. To understand this, we need to consider the laws of conservation of momentum, which state that within a closed system, momentum does not change. When an object, such as a ball, falls and collides with the Earth, there is an equal and opposite change in momentum of the Earth, maintaining the system's total momentum. Although the Earth's recoil is imperceptibly small due to its large mass, it is still present.

For example, if a superball collides with the ground, the change in momentum of the superball will be equal in magnitude and opposite in direction to Earth's change in momentum. This is because, in a closed system, the sum of the forces is zero, leading to no net change in momentum. Similarly, when considering two cars in a collision where friction is negligible, the total momentum before and after the collision remains the same.

In summary, when considering a sufficiently large system, such as an object-and-Earth system, the law of momentum conservation implies that the total momentum remains constant, even if individual components within that system change momentum.

Power is the rate of work done. Less the power is less will be the work done or longer be the time period. Hence, same amount of work being done over a longer period of time.

Power is a physical quantity that describes the work done per unit time. Thus, power is the rate of work done. Work done on a body is equivalent to the energy of the body. Thus power is rate of energy too.

If a force applied on a body results in displacement, it is said to be work done on the body. The ratio of work done to the time is the power of the object.

P = w/t

Therefore, as the work done increases power increases. The more work done within short time, more will be the power. If the same amount of work being done over a long period of time, the object is having less power.

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Final answer:

Having less power implies performing the same amount of work over a longer period of time, as power is the rate of work done over time.

Explanation:

When discussing the relationship between work, power, and time, power is defined as the rate at which work is done or the amount of work per unit time. If we consider two scenarios where the same amount of work is done, the one with less power will require a longer period of time to complete the work. Therefore, having less power most likely means there is the same amount of work being done over a longer period of time.

Correct answer choice is :

B) Scientific theories are never proven.

Explanation:

A scientific theory is a well-substantiated description of some features of the natural world, based on a body of evidence that has been frequently authenticated through investigation and experimentation. Such fact-supported hypotheses are not conclusions but authentic statements of the actual world. A scientific theory may be changed and eventually discarded if it cannot be done to fit the new conclusions in such conditions, a more precise theory is then needed.

Option (b) is correct. The scientific theories are the explanations that cannot be proven true.

Explanation:

The Scientific theories are basically the explanations given by the scientists based on the different physical appearances in the universe. The Scientific theories are given based on the patterns that have been occurring for years.

The examples of various scientific theories that are given on the Earth are the tectonic plates theory, Electromagnetic theory, theory of relativity etc. These theories are given by the scientists to explain several patterns that occur in nature.

These scientific theories have never been proven to be true but on the other hand there is no critic to question these theories. Therefore, they have been accepted universally until any proven fact denies them.

Therefore, the scientific theories can also be regarded as the explanations that are accepted universally without being proven because there has been no statement that explains against them.

Thus, Option (b) is correct. The scientific theories are the explanations that cannot be proven true.

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Scientific laws and theories

Keywords:

scientific, theories, patterns, nature, explanation, prove, critic, against, tectonic plates, laws, statement.

Answer:

0.8087 C J/g oC

Explanation:

4786 J = 89.0 g x C x (89.5 C- 23.0 C)  

4786 J = 6185.5 gC

0.8087 C J/g oC

0.809 C J/g C (sig figs)

Final answer:

The specific heat of the unknown material, given the provided values, is calculated to be approximately 0.80 J/g°C.

Explanation:

To calculate the specific heat of the unknown material, we use the formula q = mcΔT, where q is the heat absorbed or released (in joules), m is the mass of the substance (in grams), c is the specific heat capacity (in Joules per gram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).

In this question, q = 4786 joules, m = 89.0 grams, and ΔT (change in temperature) = 89.5°C - 23.0°C = 66.5°C. Plugging in these values, we get 4786 = 89.0 * c * 66.5. Solving for c, we find that c = 4786 / (89.0 * 66.5).

After calculating, the specific heat of the material is found to be approximately 0.80 J/g°C.

The maximum kinetic energy of the 1.0 kg object suspended from the spring is 0.5 Joules. This is calculated by finding the initial potential energy of the object when it is pulled 0.25 meters downwards which then gets converted to kinetic at equilibrium position.

The student's question relates to the topic of energy in simple harmonic motion, specifically related to the scenario of a mass attached to a spring. The maximum kinetic energy of an oscillating object can be found when the potential energy is at its minimum, which occurs at the equilibrium position. In this case, the maximum kinetic energy is equal to the initial potential energy of the object when it is pulled down.

The initial displacement of the object is 0.25 meters. Therefore, we can find the initial potential energy using the formula U = 0.5 × k × x², where 'U' is the potential energy, 'k' is the spring constant, and 'x' is the displacement. Substituting these values we get U = 0.5 × 16 N/m × (0.25 m)² = 0.5 Joules.

Thus, the maximum kinetic energy of the object is also 0.5 Joules since the entire potential energy at the extreme position will convert into kinetic energy when the object passes through the equilibrium position during its oscillation.

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Answer : t = 7.044 sec

Explanation :

It is given that,

Velocity, [tex]v=90\ feet/sec[/tex]

distance, [tex]s=160\ m[/tex]

[tex]H(t)=-16\ t^2+ vt+ s[/tex]

When firecracker hits the ground hen H(t) = 0

So, [tex]-16 t^2+90\ t+160=0[/tex]

or

[tex]8 t^2-45\ t-80=0[/tex]

Solving this quadratic equation, we get

[tex]t=\dfrac{-(-45) \pm \sqrt{(-45)^2-4(8)(-80)} }{2(8)}[/tex]

[tex]t=\dfrac{45\ \pm\sqrt{4585} }{16}[/tex]

[tex]t=7.044\ sec[/tex]

Neglecting negative values as time can't be negative.

Firecracker will take 7.044 sec to hit the ground.

A. Gallium