PLEASE HELP !!

In order to describe the velocity of an object, which three pieces of data are needed?

Answer: Moisture and food (bread)

Explanation:

Mould grows best in humid, damp air/wet conditions.

Since the bread is moist it will provide humidity for the mould as well as food.

A container with a cover would not be a favoring condition as mould needs oxygen to grow and survive.

Answer:

14 m/s^2

Explanation:

\(v_{f}=V_{i} +at\)

\(V_{f}=\)final velocity

\(V_{i}=\)initial velocity

a= acceleration

t=time

Initial velocity is zero, since the rock was originally at rest and time is 6 seconds.

You are looking for the final velocity, but you need acceleration to find it. Remember that:

\(F=m*a\)

Where F is force, m is mass, and a is acceleration. You know force is 7.0 N and mass is 3.0 kg. Use these to find a.

\(7.0 N= 3*a\)

\(\frac{7}{3} = a\)

So now...

\(v_{f}=V_{i} +at\)

\(v_{f}=0 +(\frac{7}{3}) (6)\)

\(v_{f}= 14 m/s^{2}\)

The moment of inertia for the compound object is 0.00455 kg·\(m^{2}\)

The moment of inertia for a compound object made by gluing a 1 kg metal rod of length 0.2 m across a diameter of a 500 g wooden disk with a radius of 10 cm, we need to consider the moments of inertia of the rod and the disk separately.
First, let's calculate the moment of inertia for the metal rod. The moment of inertia of a uniform rod rotating about an axis perpendicular to its length and passing through its center is given by the formula: I_rod = (1/12) * m * \(L^{2}\), where m is the mass and L is the length of the rod. Plugging in the values, we get: I_rod = (1/12) * 1 kg * \((0.2 m)^{2}\) = 0.0033 kg·\(m^{2}\).
Next, let's calculate the moment of inertia for the wooden disk. The moment of inertia of a uniform disk rotating about an axis perpendicular to its plane and passing through its center is given by the formula: I_disk = (1/4) * m * \(r^{2}\), where m is the mass and r is the radius of the disk. Plugging in the values, we get: I_disk = (1/4) * 0.5 kg * \((0.1 m)^{2}\)= 0.00125 kg·\(m^{2}\).
Finally, to find the total moment of inertia of the compound object, we add the moments of inertia of the rod and the disk: I_total = I_rod + I_disk = 0.0033 kg·\(m^{2}\) + 0.00125 kg·\(m^{2}\) = 0.00455 kg·\(m^{2}\).
So, the moment of inertia for the compound object is 0.00455 kg·\(m^{2}\).

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After applying the kinematic relation, the bullet’s flight time would be 0.0726 s

The kinematic equations are a set of four equations that can be used to make predictions about information regarding an item's motion that is unknown, provided that other information regarding the motion of the object is known. The equations can be applied to any motion that can be characterized as either having a constant velocity (an acceleration of 0 m/s/s) or a constant acceleration (an acceleration of 0 m/s/s), and they can be used to analyze both types of motion. They are never permitted to be used during any time frame in which the acceleration is undergoing a change.

In this case we will be using the third kinematic relation:

d = vt + ½ gt²

in this case, we are given that:

d = (2.58 cm × ( 1 m ÷ 100 cm))

v = 0 m/s

g = 9.8 m/s

Thus, the bullet’s flight time would be:

(2.58 cm × ( 1 m ÷ 100 cm)) = (0 m/s) × t + ½ (9.8 m/s) × t²

½ (9.8 m/s) × t² = (2.58 cm × ( 1 m ÷ 100 cm))

T = √0.005265

T = 0.0726 s

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Answer:

36

Explanation:

2=24

24÷2=1

1=12

12*3=36

Ratio is from pigs to horses so:

Let no. of pigs be x

= 2:3 :: x:24

= 2/3 = x/24

= 2 × 24 = 3x

= 48/3 = x

= 16 = x

So the no. of pigs in farm - 16.

Answer:

If the car comes to a sudden stop, your body tends to keep moving forward.

Explanation:

Explanation:

Plastics with a density less than or equal to 1.025 g/mL will float in seawater, while plastics with a density greater than 1.025 g/mL will sink.

Here are some examples of plastic densities:

Polyethylene terephthalate (PET) has a density of approximately 1.38 g/mL, so it will sink in seawater.

Polypropylene (PP) has a density of approximately 0.9 g/mL, so it will float in seawater.

High-density polyethylene (HDPE) has a density of approximately 0.95 g/mL, so it will float in seawater.

Polystyrene (PS) has a density of approximately 1.05 g/mL, so it will sink in seawater.

Based on the above examples, we can see that plastics such as polypropylene and high-density polyethylene will definitely float in seawater, while others such as polyethylene terephthalate and polystyrene will definitely sink. Other types of plastics with densities close to 1.025 g/mL may float or sink depending on their exact density and the conditions of the water, such as temperature and salinity.

Answer:

5n

Explanation:

10n divided by 2n is 5n

1. a) λ= 0.0281 m = 28.1 x 10^-7 m. b) θ = 0.254 rad = 14.6°. 2) Hence, the width of the slit is 0.456 mm. are the answers

explanation is given below

1. Monochromatic light is incident on a pair of slits that are separated by 0.220 mm. The screen is 2.40 m away from the slits.

a) If the distance between the central bright fringe and either of the adjacent bright fringes is 1.87 cm, the wavelength of the incident light is 589.4 nm. The wavelength of the incident light can be calculated using the formula;

λ= ds/Dy

where, λ= wavelength of light, d = separation between the slits, S = distance between the slits and screen, Y = distance of the fringe from the center, Bright fringe distances from center = 1.87 cm

For the first bright fringe, the distance of the fringe from the center is given by Y = 0.935 cm.

For the second bright fringe, the distance of the fringe from the center is given by

Y = 2.80 cm.

ΔY = Y₂ - Y₁

ΔY = 2.80 cm - 0.935 cm

ΔY = 1.865 cm = 0.01865 m

Now substitute the given values in the formula

λ= ds/Dy

λ= 0.00022 m x 2.4 m / 0.01865 m

λ= 0.0281 m = 28.1 x 10^-7 m

b) At what angle does the next set of bright fringes appear?

The distance between the screen and slits is much greater than the separation between the slits, which allows us to assume that the rays of light emerging from the two slits are parallel.

The angle between the central maximum and the nth bright fringe can be calculated using the formula;

θ = n λ / d , θ = angle between the nth bright fringe and the central maximum n = 2 for the second-order bright fringe

Now substitute the given values in the formula

θ = n λ / d

θ = 2 × 28.1 x 10^-7 m / 0.00022 m

θ = 0.254 rad = 14.6°

2. Monochromatic light of wavelength 487 nm is incident on a single slit.

The second-order diffraction minimum is at an angle of 7.80 x 10^-3 rad.

The width of the slit is 0.456 mm.

The position of the nth minimum is given by;

sin θ = n λ / d

w= n λ / sin θ

The width of the slit can be calculated using the above formula,

where n = 2λ = 487 nmθ = 7.80 × 10^-3 rad

w = 2 × 487 nm / sin (7.80 x 10^-3 rad)

w = 0.000456 m = 0.456 mm

Hence, the width of the slit is 0.456 mm.

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The acceleration due to gravity on another planet is multiplied by your mass to calculate your weight on that planet. The acceleration due to gravity is different on each planet, so your weight will also be different. For example, the acceleration due to gravity on Earth is 9.8 m/s², while the acceleration due to gravity on Mars is 3.711 m/s². This means that if you weigh 100 pounds on Earth, you would weigh only 37.11 pounds on Mars.

The formula for calculating your weight on another planet is:

Weight = Mass * Acceleration due to gravity

For example, if you weigh 100 pounds on Earth and you want to calculate your weight on Mars, you would use the following formula:

Weight on Mars = 100 pounds * 3.711 m/s²

Weight on Mars = 371.1 pounds

Therefore, your weight on Mars would be 371.1 pounds.

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To find the period of the wave emitted by the porpoise, we can use the relationship between the wavelength, speed, and period of a wave.

The period of a wave is the time it takes for one complete cycle of the wave to pass a given point. It is usually represented by the symbol T. The relationship between the wavelength (λ), speed (v), and period (T) of a wave is given by the equation:

v = λ / T

where v is the speed of the wave, λ is the wavelength, and T is the period.

In this case, we are given the wavelength (λ) of the sound wave emitted by the porpoise, which is 1.6 cm, and the speed (v) at which the wave travels in seawater, which is 1520 m/s. We need to calculate the period (T) of the wave.

To find the period, we rearrange the equation as:

T = λ / v

Substituting the given values:

T = 1.6 cm / 1520 m/s

Since the units are different, we need to convert the wavelength from centimeters to meters:

T = (1.6 cm * 0.01 m/cm) / 1520 m/s

T = 0.016 m / 1520 m/s

T ≈ 1.05 x 10^(-5) s

The period of the wave emitted by the porpoise is approximately 1.05 x 10^(-5) seconds. This means that it takes this amount of time for one complete cycle of the wave to pass a given point.

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Answer:

1/f = 1/i + 1/o      thin lens equation

1/i = 1/f - 1/o

i =  o * f / ( o - f) = 50 * (-20) / (50 - (-20)) = -14.3 cm

The final image is  erect and 14.3 cm behind the curved surface

M = -o / i = 14.3 / 50 = .29      magnificaton of object

S = .29 * 25 cm = 7.1 cm       appearance of bird in mirror (height)

The force diagram of the given situation is shown below:

As you can notice, force due to the friction of the box with the flat surface is opposite to the applied force.

Explanation:

the correct answer is C.

if there is no wind resistance; in vaccum both will hit the ground at the same time.

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The relative humidity at the surface  is 63.55%. Relative Humidity (RH) refers to the measure of the degree of water vapor present in the atmosphere as compared to the maximum amount of water vapor required for saturation at that temperature.

In order to determine the relative humidity at the surface of the given problem, we will first need to determine the saturation vapor pressure at

-16.9°C.1.

Using the Tetens formula, we get;

es = \(6.11 × 10 ^ ((7.5T)/(T + 237.3))\)

Here,

T = -\(16.9°Ces = 6.11 × 10 ^ ((7.5(-16.9))/( -16.9 + 237.3))= 1.07 kPa2\).

Using the Clausius-Clapeyron relation, we get;

e = \(es × e^[-L/R (1/T - 1/T0)]\)

Here, L is the latent heat of vaporization of

water = \(2.45 × 10 ^ 6 J/kg\)

R is the specific gas constant for water

vapor = 461.5 J/kg K.1/T

is the Kelvin temperature at which es occurs,

i.e. (-16.9 + 273) = 256 K.1/T0

is the Kelvin temperature of the surface dew point temperature,

i.e. \((12 + 273) = 285 K.e = 1.07 kPa × e^[-(2.45 × 10 ^ 6 / 461.5)(1/256 - 1/285)]= 0.68 kPa3.\)

The relative humidity at the surface is given by;

RH = (e/es) × 100RH = (0.68/1.07) × 100= 63.55%

Therefore, the relative humidity at the surface of the given problem is 63.55%.

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Answer: According to the law of conservation of momentum, the total momentum before the collision is equal to the total momentum after the collision. Assuming that the positive direction is the direction in which Janet was moving before the collision, we can write:

Initial momentum = final momentum

(mass of Janet) x (initial velocity of Janet) + (mass of Sarah) x (initial velocity of Sarah) = (mass of Janet) x (final velocity of Janet) + (mass of Sarah) x (final velocity of Sarah)

We know that Sarah was initially at rest, so her initial velocity was 0 m/s. We also know that Janet continued forward at 2 m/s after the collision, so her final velocity was 2 m/s. Substituting these values into the equation above and solving for the initial velocity of Janet, we get:

(58 kg) x (initial velocity of Janet) + (39 kg) x (0 m/s) = (58 kg) x (2 m/s) + (39 kg) x (4 m/s)

58(initial velocity of Janet) = 406 + 156

58(initial velocity of Janet) = 562

(initial velocity of Janet) = 9.69 m/s (rounded to two decimal places)

Therefore, Janet was moving at 9.69 m/s initially before the collision.

Explanation:

Answer:

Well this would be science... not physics...

Explanation:

1) both are a product of cooling lava/magma

2) Both stones can be caused during volcanic eruptions or clastic flow

3) Both are igneous in family (duh)

4) Intrusive rocks are formed underground from seeping into crevasses and are slow cooling and extrusive rocks are fast or instant cooling and cool above the surface (if differences are needed)

Answer:

there it is fella u were right with ur answer

The possible valid accesses for an array a and vector v, each with 10 elements is given below:Array: a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9]Vector: v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]

The term array is used to define a set of similar data types that are stored in contiguous memory blocks. The index of an array starts at 0, which means the first element of the array is stored at index 0. In the case of arrays, the elements must be of the same data type.The term vector is defined as a dynamic array, which means that the size of the vector can be changed during runtime. Vectors are defined in the same way as arrays, except that they have a dynamic size limit and can be easily resized.

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Explanation:

v luôn luôn dương. B. a luôn dương.

C.

When a body is positively charged, it implies that there is positive as well as negative charge in the body but the positive charge is more than negative charge.

Most of the materials that make up our world are composed of atoms, which are made up of a nucleus containing protons and neutrons surrounded by electrons. When an atom loses or gains electrons, it becomes positively or negatively charged, respectively. This is because the number of protons in an atom, which determines its atomic number and chemical properties, does not change.

When there are more protons than electrons, the atom becomes positively charged, and when there are more electrons than protons, it becomes negatively charged.Positive charge is the property of a material that has lost one or more electrons and therefore has more protons than electrons. Positive charges repel other positive charges, while negative charges attract positive charges.

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Answer:

The foil makes the microwave spark it can smoke up and catch fie.

Explanation:

-The aluminum foil's sharp edges are what causes the fire, smoke, and sarks.

- Hope This Helps!

-Justin:)

Answer:

itll spark and catch fire

Explanation:

The wave phenomena described in this scenario is known as interference.

Interference occurs when two or more waves interact with each other, resulting in the reinforcement or cancellation of the waves at certain points in space.

In this case, the two alarm sirens are emitting sound waves that are overlapping and interfering with each other. When the waves from the sirens are in phase, meaning their peaks and troughs align, constructive interference occurs. Constructive interference leads to the amplification of the sound waves, resulting in a louder sound at points between the two sirens.

On the other hand, when the waves from the sirens are out of phase, meaning their peaks and troughs are misaligned, destructive interference occurs. Destructive interference leads to the cancellation of the sound waves, resulting in a fainter sound at points where the waves interfere destructively.

The loud and faint regions of sound between the two sirens are a result of the constructive and destructive interference of the sound waves emitted by the sirens, respectively.

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Answer:

a technique for the separation of a mixture by passing it in solution or suspension through a medium in which the components move at different rates.

The nurse determined that the heart beats periodically 60 times in 60 seconds, which means that the heart beats once every second. which in this case is one heartbeat. the period of the heartbeat is 1 second.

Therefore, the period of the heartbeat is 1 second. Option A (1 Hz) is incorrect because 1 Hz refers to the frequency, which is the number of cycles per second, not the period. Option B (60 Hz) is incorrect because it is an extremely high frequency that is not consistent with the human heartbeat. Option D (60 s) is incorrect because it is too long of a period for one heartbeat.
"A nurse takes the pulse of a heart and determines the heart beats periodically 60 times in 60 seconds. The period of her heartbeat is The period of her heartbeat is C: 1 s.

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Answer:

D

Explanation:

Light is an electromagnetic wave that consists of oscillating electric and magnetic fields. It exhibits various properties, including wavelength, frequency, speed, and polarization.

Polarization refers to the orientation of the electric field vector of a light wave. Unpolarized light consists of electric field vectors oscillating in all possible directions perpendicular to the direction of propagation. Polarized light, on the other hand, has its electric field vectors confined to a specific orientation. Polarization can be achieved through various mechanisms, such as reflection, scattering, or passing light through certain materials. Polarizers, such as polarizing filters, can selectively transmit or block light waves based on their polarization orientation. The study of light and its properties, including polarization, has contributed to numerous advancements in various fields, such as optics, telecommunications, and technology.

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Answer:

B

Explanation:

the answer is B, I had the same question in a different phrasing

When a material in liquid state is given energy, it changes its phase from liquid to vapor; the energy absorbed in this process is called heat of vaporization. The heat of vaporization of water is about 2,260 kJ/kg, which is equal to 40.8 kJ/mol. The vaporization is the opposite process of condensation.

hope this helped <3

Answer:

D. The rest of the bulbs stop shining and shut off.

Explanation:

When one bulb  in a series circuit  burns, out, the rest of the bulbs stop shining and shut off.​ Option D is correct.

What is an electric bulb?

An electric bulb is a gadget that uses electricity to create visible light. It is the most popular type of artificial lighting and is necessary for modern society.

The light bulb is connected to a switch in a parallel configuration. The switch is open, which means there will be a lot of resistance and no current will flow via this route.

Across the parallel connection, the battery would create the same potential difference. Because the current would not go via the open switch, it would instead flow through the light bulb, causing it to illuminate.

When one bulb  in a series circuit  burns, out, the rest of the bulbs stop shining and shut off.​

Hence, option D is correct.

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