harry runs off of the roof of a hotel 20 meters high. there is a pool

Answer:

V = a t      velocity after time t

t = 33.1 / 9.80 = 3.38 sec   (time ball had been falling)

S = 1/2 a t^2 = 55.9 m

So the ball had been falling  for 7 * 8 = 56 m  

The child was 7 floors from the top

Since he was on the eight floor the floors below him were

7 * 8 + 12 = 68 m     total floors below child

68 + 56 = 124 m      total height of building

Total floors in building = 7 + 7 + 1 = 15 floors

PE at top = KE at bottom

KE = m g h = .125 * 9.80 * 124 = 152 Joules

Answer:

\(\huge \boxed{\mathrm{Option \ D}}\)

Explanation:

Two forces are acting on the object.

Subtracting 2 N from both forces.

2 N → Object ← 5 N

- 2 N                 - 2N

0 N → Object ← 3 N

The force 3 N is pushing the object to the left side.

The mass of the object is 10 kg.

Applying formula for acceleration (Newton’s Second Law of Motion).

a = F/m

a = 3/10

a = 0.3

Answer:

5m/s

Explanation:

15m/s ÷ 3s = 5m/s

Answer:

b

Explanation:

The answer is B. Why is the ocean floor not flat and smooth like the bottom of a bathtub?

Scientists were surprised to find that the ocean floor was not a flat and featureless plain, but rather had mountains, valleys, and other geological features. This discovery raised questions about how these features formed and what processes were involved. Scientists began to investigate the causes of these features, such as plate tectonics and volcanic activity, and how they might have shaped the ocean floor over millions of years. Understanding the complex and dynamic nature of the ocean floor has since become an important area of study in earth science and oceanography.

Step 1: Use Pictures

Research how other ads (especially Newspaper ads) market their toothpaste. Usually they just show a picture of a tube of toothpaste with either their target demographic using it or the toothpaste squirting out.

Step 2: Accentuate the Good Stuff

Make sure your audience is aware of all the benefits and give them evidence so they can determine if it's the best choice for them, and be sure to list all ingredients and list all additional components that sets it apart from other brands. Think of this step as a resume for your toothpaste. Obviously don't lie about what your toothpaste can do, but you want your potential customers to consider buying it.

Step 3: Focus Group (Feedback)

Post some results of how well your toothpaste was received by a group of people. Keep it sweet and simple and straight to the point. (Gather a diverse group of people who are in your target demographic to try the toothpaste, and ask for their opinions, make tweaks if needed and test again until a good chunk of people like it, that's how you get support for your brand of toothpaste.)

Step 4: Spark the Press

Reach out to local newspapers/magazines and show them your portfolio of people's feedback on your toothpaste, and with whatever money you have, you'll be paying them to allow you to put your ad in their paper (sometimes it can be vise versa).

Hope this helps, this is just a short summery of what I learned in Entrepreneurship.

a) The cost intended to operate an old-style incandescent for 24 hours is $ 0.154.

b) The cost intended to operate a modern LED light bulb for 24 hours is $ 0.022.

c) The cost intended to operate an electric oven for 10 hours is $ 4.84.

a) Let us calculate the energy used by this bulb, which is a function of both its power and its current time.

Energy = P t

Energy = 60 × 24 = 1440 W h

As the price of energy is expressed in kWh,

Energy = 1440 Wh (1 kW / 1000W)

Energy = 1.40 kWh

Calculate the cost of energy

Cost = 0.11 × 1.40

Cost = $ 0.154

b) Energy = 8.3 × 24 = 199.2 Wh = 0.199 kWh

Cost = 0.11 × 0.199

Cost = $ 0.022

c) Let us determine how much energy the oven uses,

P = I V

P = 20× 220

P = 4400 W

We look for the energy consumed

Energy = 4400 × 10

Energy = 44000 Wh = 44 kWh

We calculate the cost of this energy

Cost = 0.11 × 44

Cost = $ 4.84

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Answer:

Explanation:

10. As a spaceship is moving toward Earth, an Earthling measures its length to be 325 m, while the captain on board radios that her spaceship's length is 1150 m. (c = 3.00 × 108 m/s) (a) How fast is the rocket moving relative to Earth? (b) What is the TOTAL energy of a 75.0-kg crewman as measured by (i) the captain in the rocket and (ii) the Earthling?

(a) The amplitude of the wave is determined as 8 cm.

(b) The period of the wave motion is  20 s and the frequency of the wave is 0.05 Hz

(c) The wavelength of the wave is 500 cm.

(a) The amplitude of the wave is the maximum displacement of the wave.

from the graph, amplitude of the wave = 8 cm

(b) The period of the wave motion is calculated as;

T = 20 s

The frequency of the wave = 1/T = 1/20 s = 0.05 Hz

(c) The wavelength of the wave is calculated by applying the following wave formula.

λ = v / f

λ = 25 cm/s / 0.05 Hz

λ = 500 cm

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The average density of the nuclear material is approximately 1.06 x 10^17 kg/m³, which corresponds to option (a) in the given answer choices.

The average density of nuclear material can be calculated using the formula:

Density = Mass / Volume

The volume of a spherical nucleus can be calculated using the formula for the volume of a sphere:

Volume =\((4/3) * \pi * r{^3\)

where r is the radius of the nucleus.

Given the radius of the carbon nucleus, r = 3 x 10^-15 m and its mass, M = 12 u.

To calculate the mass of the nucleus in kg, we need to convert the atomic mass unit (u) to kilograms. 1 atomic mass unit (u) is equal to 1.66 x 10^-27 kg. Therefore, the mass of the carbon nucleus in kg is:

M = 12 u * \(1.66 \times 10^{-27\) kg/u = \(1.992 \times 10^{-26\) kg

Now we can substitute the values for volume and mass in the density formula:

Density = M / V = M / [(4/3) * π * r^3]

Density = (\(1.992 \times 10^{-26} kg\)) / [(4/3) * π * (\(3 \times 10^{-15}\) m)^3]

Density = 1.06 x 10^17 kg/m³

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Answer:

A is the load in the diagram

Answer:

i think the answer is A

Answer:

it is double the temperature change of iron

The audience for the 9th grade physics MCAS is students in the 9th grade who are taking the Massachusetts Comprehensive Assessment System (MCAS) physics exam.

The exam is designed to assess students' knowledge and skills in physics, and it is used to make decisions about students' placement in courses, graduation requirements, and eligibility for college and career programs.

The 9th grade physics MCAS is a multiple-choice exam that consists of 50 questions. The questions are based on the Massachusetts Curriculum Framework for Science, which outlines the standards that students are expected to meet in physics.

Students who take the 9th grade physics MCAS must score at least proficient in order to meet the state's graduation requirements. Students who score below proficient may be required to take additional courses or remediation.

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The magnitude and direction of the electric field is equal to 3.45 x10^13 N/m and the direction in towards the negative charge.

To calculate the electric field of a point it is necessary to use the following expression:

                                             \(E = k\frac{Q}{d^{2}}\)

Thus, calculating the field formed by each charge we have:

                                    \(E = 9 \times 10^{9} \times \frac{8}{36\times 0.0001}\)

                                      \(E = 2\times 10^{13} V/m\)

                                   \(E = 9 \times 10^{9} \times \frac{5.8}{36\times 0.0001}\)

                                    \(E = 1.45 \times 10^{13} N/m\)

The direction of the electric field of the negative charge is towards the charge (attracted) and of the positive charge is repelled.

So, we can add the two values ​​of field found, since the two are directed towards the negative charge, so that :

                                       \(E = 2 \times 10^{13} + 1.45 \times 10^{13}\)

                                       \(E = 3.45 \times 10^{13} N/m\)

So, the magnitude of eletric field is equal to 3.45 x10^13 N/m and the direction in towards the negative charge.

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From the laws of Newton, the balls experiences an equal force directed in opposite directions.

Collision is said to occur when on object bumps into another. Collisions are described by the law of conservation of linear mometum which ststes that momentum is neither created nor destroyed.

The question is incomplete hence we can not fully answer the question. However, from the laws of Newton, the balls experiences an equal force directed in opposite directions.

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A wave with a wavelength of 4.0 m moves with a speed of 2.0 m/s will have frequency of 0.5 Hz.

Given,

The wavelength of the wave, λ = 4.0 m

Speed of the wave, v = 2.0 m/s

Frequency of the wave can be calculated as;

ν =v/λ

= 2/4

=1/2 Hz

Or, 0.5 Hz

Hence, the frequency of the wave will be 0.5 Hz.

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Answer:

All rocks are made of minerals.

Explanation:

Answer:

all rocks are made out of minerals

The average speed of the motorist in the second half of the journey is determined as 7 km/h.

The average speed of an object is the ratio of total distance to total time of motion.

21 = (35 + x) / 2

35 + x = 42

x = 42 - 35

x = 7 km/h

Thus, the average speed of the motorist in the second half of the journey is determined as 7 km/h.

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Answer:

Answer:

Magnetism is the force of attraction or repulsion between substances.

Magnetism is defined as an attractive and repulsive phenomenon produced by a moving electric charge. The affected region around a moving charge consists of both an electric field and a magnetic field. The most familiar example of magnetism is a bar magnet, which is attracted to a magnetic field and can attract or repel other magnets.Magnetism is caused by the electromagnetic force, which is one of the four fundamental forces of nature. Any moving electric charge (electric current) generates a magnetic field perpendicular to it.

Answer: The sound wave made by a drum is larger and has a lower frequency compared to that made by a bell, which results in a lower pitch and louder sound.

Explanation: The sound wave made by a drum is larger and has a lower frequency compared to that made by a bell, which results in a lower pitch and louder sound. This is because the drum produces more low-frequency sound waves due to its larger size and shape, whereas a bell produces more high-frequency sound waves due to its smaller size and shape.

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The vector with a magnitude of 5 and in the direction of the vector 4i - 3j + k is approximately (20/√26)i + (-15/√26)j + (5/√26)k.

The given vector can be normalized before being multiplied by the desired magnitude. This is how to locate the vector:

The vector that has been provided should be normalized by dividing each of its components by its magnitude. The Pythagorean theorem can be used to determine the magnitude of the vector 4i - 3j + k:

Magnitude = √(4² + (-3)² + 1²) = √(16 + 9 + 1) = √26

Normalize the vector by dividing each component by the magnitude:

Normalized vector = (4/√26)i + (-3/√26)j + (1/√26)k

Multiply the normalized vector by the desired magnitude:

To obtain a vector with a magnitude of 5, multiply each component of the normalized vector by 5:

Desired vector = 5 * ((4/√26)i + (-3/√26)j + (1/√26)k)

Simplifying the expression gives:

Desired vector ≈ (20/√26)i + (-15/√26)j + (5/√26)k

So, the vector with a magnitude of 5 and in the direction of the vector 4i - 3j + k is approximately (20/√26)i + (-15/√26)j + (5/√26)k.

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The total horizontal distance traveled by the tennis ball during the entire time it is in the air is approximately: 23 m

It is the line drawn horizontally from the viewer's eye. If an item is above the horizontal level, the angle of elevation is the angle created between the line of sight and horizontal level.

As we know,

H = [u(y)]²/2 g

or, H = (6.1)²/20

or, H = 1.86 m ≈ 1.9 m

Total max height = 1.9 m + 9.8 = 11 m

H = [u(y)]²/2g

or, 11 = [u(y)]²/20

or, u(y) = 14.832 m/s

u(x) = 7.6 m/sec

Now, R = u²sin 2θ/g

or, R = [2 u(x) u(y)] /g

or, R = [2×(7.6 )×( 14.832 )] / 10

or, R = 22.54 m
or, R = 23 m

Correct option: A

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While certain types of glass containers may be suitable for short-term storage of vinegar, it is generally recommended to use non-reactive materials, such as plastic or stainless steel, for long-term storage to avoid any potential chemical reactions or corrosion.

Vinegar is an acidic liquid that contains acetic acid. When vinegar comes into contact with certain types of glass, particularly those made of lead or other reactive materials, a chemical reaction can occur. This reaction can lead to the leaching of potentially harmful substances into the vinegar.

Glass containers made from specific types of glass, such as soda-lime glass, are generally safe for storing vinegar.

However, it is important to note that prolonged storage or exposure to vinegar can still cause the glass to corrode over time. This can result in the deterioration of the glass container, potentially leading to breakage or the release of glass fragments.

To avoid any potential issues, it is recommended to use containers made of non-reactive materials, such as food-grade plastic or stainless steel, for long-term storage of vinegar. These materials do not react with the acidic nature of vinegar and do not pose a risk of leaching harmful substances.

Additionally, it is important to store vinegar in a cool, dark place to maintain its quality and prevent spoilage. Exposure to light and heat can degrade the quality of vinegar over time.

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From the law of conservation of momentum, your velocity after you throw it will be 0.5 m/s

Momentum is the product of mass and velocity. It is measured in Kgm/s

If you weigh 40kg and are standing still on a skateboard and throw a 1kg ball to the left (negative velocity) at a velocity of -20m/s, From the law of conservation of momentum, your velocity after you throw it can be calculated.

MV = mv

where

Substitute all the parameters into the formula

40V = 1 × 20

V = 20/40

V = 0.5 m/s

Therefore, your velocity after you throw it will be 0.5 m/s

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ANSWER and EXPLANATION

We want to classify the forces given as either external forces or internal forces.

An internal force is a force that does not change the mechanical energy of an object. In other words, these forces act between two different parts of an object.

An external force is a force that is due to an external agent acting outside of a body or system.

Therefore, going by these definitions, we see that the forces that are internal forces are:

- Shear

- Gravity

- Torsion

and the force that is an external force is:

- The force of the floor on your feet when you are standing.