A 66-kg skier starts from rest at the top of a 1200-m-long trail which drops a total of 170 m from top to bottom. at the bottom, the skier is moving 11 m/s.

Final answer:

The accurate conversion of liquid to solid volume is that 1000 liters equal one cubic meter. This is because 1 liter is equal to 1000 cubic centimeters, and there are 1000 liters in a cubic meter.

Explanation:

The correct conversion of liquid to solid volume among the options provided is that 1000 liters equal one cubic meter. To understand why, we can consider linear dimensions and their cubed equivalents. One liter is defined as the volume of a cube that measures 10 cm (or 1 decimeter, dm) on each side. Since volume is calculated by multiplying length by width by height, this cube's volume would be 10 cm × 10 cm × 10 cm = 1000 cubic centimeters (1000 cm³). In terms of cubic meters, since a cubic meter (m³) is the volume of a cube that measures 1 meter (100 cm) on each side, we can determine that there are 100³ or 1,000,000 cm³ in 1 m³. Therefore, 1000 liters, each being equivalent to 1000 cm³, would collectively make up one cubic meter (1000 × 1000 cm³ = 1,000,000 cm³, which is 1 m³).

Final answer:

According to Newton's Law of Universal Gravitation, if the moon were 2 times closer to Earth, the gravitational force would be 4 times greater than at its current distance.

Explanation:

If the moon were 2 times closer to earth than it is now, the gravitational force between Earth and the Moon can be determined using Newton's Law of Universal Gravitation, which states that the gravitational force (F) between two masses is directly proportional to the product of their masses ([tex]m_1[/tex] and [tex]m_2[/tex]) and inversely proportional to the square of the distance (r) between their centers.

The equation for gravitational force is [tex]F = G * (m_{1} * m_{2}) / r^2[/tex], where G is the gravitational constant. According to this law, if the distance between two objects is reduced by half, the gravitational force between them would increase by a factor of 22, or 4 times, because the force varies inversely with the square of the distance. Therefore, if the Moon were 2 times closer to Earth, the gravitational force would be 4 times greater than it is at its current distance.

The minimum force needed to just lift the ball above the floor is 55 N.

The ball has two radii, one of 10 cm and the other of 20 cm. This means that the ball is wider than it is tall. When the ball is lifted over the step, the force needed to lift it will be greatest at the point where the ball is widest.

The force needed to lift the ball at the widest point is equal to the weight of the ball plus the force due to gravity. The force due to gravity is equal to the mass of the ball times the acceleration due to gravity. The mass of the ball is 50 N / 9.8 m/s² = 5.1 N.

force = weight + force due to gravity

force = 50 N + 5.1 N

force = 55 N

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Answer:

Human kids are able to acquire more diverse set of skills when they are in there preschool.As they learn how to communicate with their class mates, along with which they also get more developed physically. Kids are more likely to know about running a distance, jumping over obstacles, and can do other form of games and exercises if trained well by the trainer or a coach.

While, some of the physical skills that a preschooler is likely to master are as follows:

By the age of five, a preschooler is likely to have mastered skipping on alternate feet, catching a ball, balancing on one foot, and possibly beginning to learn how to ride a bicycle with training wheels. These activities mark the development of a child's gross and fine motor skills during early childhood.

A preschooler is likely to master a variety of physical skills as they grow. By the age of five, many children are able to skip on alternate feet, balance on a balance beam, catch a ball thrown from a meter away, and balance on either foot with good control. These milestones demonstrate the ongoing development of both gross motor skills and fine motor skills. Gross motor skills are large movements involving the arms, legs, feet, or the entire body, which improve through activities like running, jumping, and climbing. Fine motor skills focus on smaller actions using the hands and fingers, like cutting with scissors or drawing. For a preschooler, being able to build a three-dimensional structure with blocks by copying a model, or demonstrating good control with a pencil, are indicators of their fine motor skill development.

Moreover, some preschoolers may begin learning how to ride a bicycle with training wheels, enhancing their coordination, balance, and spatial awareness. These examples show the diverse range of physical tasks that children at this age start to master, preparing them for more complex movements and activities in later years.

The statement is false; the volume of the moon is only about 2.04% (or 1/49th) of the volume of the earth, not 33% as claimed.

The statement that the volume of the moon is about 33% of the volume of the earth is false. According to the given information, the volume of the moon is 0.0204 of the earth's volume, which means that the earth's volume is roughly 50 times that of the moon. This can also be supported by the fact that the moon's diameter is about one-fourth that of the earth, and since volume is proportional to the cube of the diameter, the moon's volume would be much less than 33% of the earth's volume.

Answer:

Explanation:

The type of motion when the velocity is not zero could vary. It could be increasing or decreasing depending upon the direction is going away from or towards  a specific  point (x) if object is speeding up or slowing down

The answer is 11 hope it helps.

The kinetic energy of a moving object is equal to the work necessary to bring it to its speed from rest

If an object is moving, then it is able of doing work. It has energy of motion, or also known as kinetic energy (KE). The kinetic energy of a thing hinge on the heaviness of the object along with its speed.

The Gauge pressure in the tire after warming on a hot day is  43.5 atm.

Gauge pressure is the pressure measured relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure.

According to the question,

Gauge pressure = total pressure - atmospheric pressure

Total pressure = gauge pressure + atmospheric pressure

Total pressure initially when volume [tex]V_{1}[/tex] = 11.8  

Total prssure = 36.0 atm + 14.7 atm

                    [tex]P_{1}[/tex]  = 50.7 atm.

Temperature = 12 + 273

                     [tex]T_{1}[/tex]  = 285 K

Using gas law to determine the total Pressure in volume, [tex]V_{2}[/tex] = 12.2 liters.  Temperature = 273 + 65

                  [tex]T_{2}[/tex] = 338 K

[tex]\frac{ P_1V_1}{ T_1} = \frac {P_2V_2}{ T_2}[/tex]

50.7 atm(11.8 liters)/ 285 K = P2(12.2 liters)/338 K

[tex]P_{2}[/tex] = 50.7(11.8) (338) / 285(12.2)

     = 58.2 atm

Total pressure = 58.2 atm

Gauge pressure = 58.2 atm - 14.7 atm = 43.5 atm

The pressure in the tire after warming on a hot day is 43.5 atm.

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Answer:

a

Explanation:

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To find the final temperature of a gold nugget losing 4.85 kJ of heat with a mass of 376 g and a specific heat capacity of 0.128 J/g°C, you calculate the temperature change and subtract it from the initial temperature in Celsius, converting it back to Kelvin to get 297.19 K as the final temperature.

To determine the final temperature of a gold nugget that loses heat to a snowbank, we must apply the formula Q = mcΔT, where Q is the heat lost or gained, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. In this case, the gold nugget has a mass (m) of 376 g, loses 4.85 kJ (4850 J) of heat (Q), and has a specific heat capacity (c) of 0.128 J/g°C. We can rearrange the formula to solve for the change in temperature (ΔT): ΔT = Q / (mc).

First, convert the heat lost from kJ to J (since the specific heat capacity is in J/g°C):

Next, plug the values into the formula to find ΔT:

ΔT = 4850 J / (376 g × 0.128 J/g°C)

ΔT = 4850 J / 48.128 J/°C

ΔT = 100.81°C

Since the gold nugget is losing heat, the final temperature will be lower than the initial temperature. The initial temperature in Kelvin is 398 K, which corresponds to 124.85°C (since 0°C = 273.15 K).

Finally, subtract ΔT from the initial temperature in Celsius to obtain the final temperature:

Final temperature = 124.85°C - 100.81°C = 24.04°C

To express the final temperature in Kelvin, add 273.15:

Final temperature in Kelvin = 24.04°C + 273.15 = 297.19 K

Therefore, the final temperature of the gold nugget is 297.19 K.

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To find the heat energy required to raise the temperature of 2 kg of copper from 10°C to 110°C, we use the specific heat capacity of copper and the formula Q = mcΔT, resulting in 77000 Joules of energy needed.

To calculate the heat energy needed to change the temperature of 2 kg of copper from 10°C to 110°C, we use the formula Q = mcΔT, where Q is the heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

The specific heat capacity (c) of copper is 0.385 kJ/kg°C (or 385 J/kg°C), and the mass (m) given is 2 kg. The temperature change (ΔT) is 110°C - 10°C = 100°C.

Replacing the values in the formula:

Q = (2 kg) x (385 J/kg°C) x (100°C)

Q = 77000 J

Therefore, the heat energy required is 77000 Joules (or 77 kJ).

Answer:

[tex]n = 1.96 \times 10^{28}[/tex] photons

Explanation:

Mass of the coffee is given as

[tex]mass = density\times volume[/tex]

here we know that

density = 0.997 g/ml

volume = 225 ml

now mass of coffee will be

[tex]m = 0.997 \times 225 = 224.325 g[/tex]

now heat required to raise the temperature of coffee will be

[tex]Q = ms\Delta T[/tex]

[tex]Q = 224.325 \times 4.184 \times (62 - 25)[/tex]

[tex]Q = 34727.3 J[/tex]

now we know that energy of one photon is

[tex]E = \frac{hc}{\lambda}[/tex]

[tex]E = \frac{(6.6 \times 10^{-34}) ( 3 \times 10^8)}{0.112}[/tex]

[tex]E = 1.77 \times 10^{-24} J[/tex]

now it requires "n" photons to complete the energy

[tex]n\times (1.77 \times 10^{-24}) = 34727.3[/tex]

[tex]n = 1.96 \times 10^{28}[/tex]

The number of photons that are required to heat 225 ml of coffee from 25.0 °C to 62 °c

n = 1.962 × 10^(28) photons

We are given;

Wavelength; λ = 11.2 cm = 0.112 m

density; ρ = 0.997 g/ml

volume; V = 225 ml

Specific heat capacity; c = 4.184 J/g.k

Change in temperature;

Δt = (273 + 62) - (273 + 25) K = 37 K

Formula for mass given density and volume is;

m = Vρ

Thus; mass of coffee;

m = 225 × 0.997

m = 224.325 g

Now, formula for Quantity of heat required to raise the temperature is;

Q = mcΔt

Thus;

Q = 224.325 × 4.184 × 37

Q = 34,727.3046 J

Now, we know that formula for energy of photon is; E = hc/λ

Where;

h is Planck's constant = 6.6 × 10^(-34) J.s

c is speed of light = 3 × 10^(8) m/s

λ is wavelength.

Thus;

E = [6.6 × 10^(-34) × 3 × 10^(8)]/0.112

E = 1.77 × 10^(-24) J

To get the number of photons required, we will use the formula;

n = Q/E

Thus;

n = 34,727.3046/(1.77 × 10^(-24))

n = 1.962 × 10^(28) photons

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Answer:

The baseball that is a home run

Explanation:

Work done is calculated using the formula:

W = F x d  (Where F is force, and d is distance)

Hence, the greater the force, and the greater the distance, the more work is done.

The question states that the batter hit with the same amount of force, so F will not change. The only difference between the two balls is the distance moved. In the formula, it can be seen that if the distance increases (while F stays the same) the work done will also increase. This can lead to the conclusion that the ball that traveled further, did more work, and hence the ball that was a home run did more work than the other baseball.

Answer:

Explanation:

1) Level of oxygen consumption is higher in case of aerobic exercise.

2) Aerobic exercise is slow, light  and  long duration exercise, like jogging but anaerobic exercise is fast and short duration exercise like swimming .

3) Aerobic exercise helps in improving the functioning of heart , muscle etc. Anaerobic exercise helps in burning of body fat.

Answer:

Estrogen

Explanation:

Estrogen is the hormone which is very useful in the sexual and reproduction development in the women.

This hormones also known as females sex hormones. The term estrogen refers to all the chemically related hormones  in this group, which are estradiol, estrone and estriol.

It is related with the secondary development characteristics means it is related with the female reproductive system and the development of breast.

Therefore, it is a hormone which is related to the sexual and reproduction development but not related with any kind of stress.

law A is a scientific law and Law B is a societal law.

i just did this test

Answer: The correct answer is B) Only one’s negative experiences can lead an individual to create stereotypes.

Perception is defined as the sequence of steps that are initiated with the reception of stimulus from the environment and ends with the interpretation. In other words, it is the interpretation for the sensory information. It is related to stimuli from the environment and the response produced for it by the individual.

One's negative experience can lead an individual to create stereotypes is not in regard of forming perception. Stereotype corresponds to a set of ideas that a person possesses ( like about a group of people) about something, usually in a negative direction. Whereas, a perception can be created in a positive as well as negative way.    

Thus, option B) is the right answer.