prepare a pro d. How does the use of prefixes make each expression and conversion of measurement easier? Write with examples.​

Explanation:

Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.

Answer:

Astronomers use a technique known as star parallax, or trigonometric parallax, to calculate the distance between close objects in space. Simply explained, when Earth rotates around the sun, they measure a star's apparent movement against the background of more distant stars.

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Answer: Down below is the answer in complete sentences!

Explanation:

PART A:

Gravity and Acceleration are two additional forces acting upon the sled.

PART B:

Gravity will affect the sled by pulling it down, since the slope of the hill is negative.

Acceleration will affect the sled by gradually increasing it's speed, since the slope is downwards, which in addition to the initial force exerted plus gravity increases the speed, thus the sled accelerates.

From the given information, one thing that is not assumed before starting an Anova test is that the means of the groups are all equal.

Before starting an Anova test, it is assumed that the data meet the following assumptions:

Independence: The observations in each group must be independent of each other.

Normality: The data within each group must be normally distributed.

Homogeneity of variances: The variance of the data within each group must be equal or roughly equal.

In fact, the purpose of the Anova test is to determine if the means of the groups are significantly different from each other.

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Answer:

d.)The population means are the same.

Explanation:

What is NOT assumed before starting an ANOVA test?

a.)

Populations are normally distributed.

b.)

The population standard deviations are similar.

c.)

The observations are independent and from a random sample.

d.)

The population means are the same.

Answer:

90.0 + 80 = 170

2 signifigant figures

1.70 x 10^2

When a 15-newton force acts on an object in a direction due east for 3. 0 seconds, then the change in momentum of the object is calculated as 45Ns, east.

A difference in motion is the change in momentum. When an object is in motion, strikes, or collides with another object, then the exerted force accelerates an object by varying its motion. Change in momentum is calculated using the conservation of momentum.

By definition we have ; force=dP/dt,

where p is momentum

and  momentum is force*time

Given force is 15N and time 3sec

So, p= 15*3

= 45 Ns , east.

Therefore, the change in momentum of the object is 45 N.s

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A large glob of seagull poop hits you in the face. You are able to estimate the impact velocity at 98.5 m/s. The vertical component is something less than 98.5 m/s, and that the attack was launched from an altitude less than 494 m.  

The term acceleration is defined as any process where the velocity changes. So, velocity is a speed and a direction, there are only two ways for you to accelerate are change your speed or change your direction or change both.

98.5 m/s  =  √ [ (horizontal component)² + (vertical component)² ].

The vertical component = (9.8 m/s²) x (drop time).

Therefore, we're looking for the altitude of launch,

we can use the formula for 'free-fall distance' as a function of acceleration and time as follows:

Height = (1/2) (acceleration) (time²) .

Time = (98.5 m/s) / (9.81 m/s²)

= 10.04 seconds

Height = (1/2) (9.81) (10.04)²

=   (4.905 m/s²) x (100.8 sec²)  

= 494.43 meters.

Thus, the vertical component is something less than 98.5 m/s, and that the attack was launched from an altitude less than 494 m.  

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Answer:

a) 0.60 kg cart has final velocity 3.0 m/s [E]

0.80 kg cart has final velocity 4.0 m/s [W]

b) 0.12 m

Explanation:

Take east to be positive.

a) Momentum is conserved.

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

(0.60) (-5.0) + (0.80) (2.0) = (0.60) v₁ + (0.80) v₂

-1.4 = 0.6 v₁ + 0.8 v₂

Kinetic energy is conserved in elastic collisions.

½ m₁u₁² + ½ m₂u₂² = ½ m₁v₁² + ½ m₂v₂²

m₁u₁² + m₂u₂² = m₁v₁² + m₂v₂²

(0.60) (-5.0)² + (0.80) (2.0)² = (0.60) v₁² + (0.80) v₂²

18.2 = 0.6 v₁² + 0.8 v₂²

Solve the system of equations.

-1.4 = 0.6 v₁ + 0.8 v₂

-1.4 − 0.6 v₁ = 0.8 v₂

-1.75 − 0.75 v₁ = v₂

18.2 = 0.6 v₁² + 0.8 (-1.75 − 0.75 v₁)²

18.2 = 0.6 v₁² + 0.8 (3.0625 +2.625 v₁ + 0.5625 v₁²)

182 = 6 v₁² + 8 (3.0625 + 2.625 v₁ + 0.5625 v₁²)

182 = 6 v₁² + 24.5 + 21 v₁ + 4.5 v₁²

0 = 10.5 v₁² + 21 v₁ − 157.5

0 = v₁² + 2 v₁ − 15

0 = (v₁ − 3) (v₁ + 5)

v₁ = 3 or -5

Since u₁ = -5.0 m/s, v₁ must be 3.0 m/s.

Solving for v₂:

v₂ = -0.75 v₁ − 1.75

v₂ = -4.0 m/s

b) The compression of the spring is a maximum when the carts have the same velocity.

Momentum is conserved.

m₁u₁ + m₂u₂ = (m₁ + m₂) v

(0.60) (-5.0) + (0.80) (2.0) = (0.60 + 0.80) v

-1.4 = 1.4 v

v = -1.0

Energy is conserved.

½ m₁u₁² + ½ m₂u₂² = ½ (m₁ + m₂) v² + ½ kx²

m₁u₁² + m₂u₂² = (m₁ + m₂) v² + kx²

(0.60) (-5.0)² + (0.80) (2.0)² = (0.60 + 0.80) (-1.0)² + (1200) x²

18.2 = 1.4 + 1200 x²

16.8 = 1200 x²

x² = 0.014

x = 0.12

Answer: The  Answer Is A

Explanation:

Answer:

d.  There are not enough nonverbal messages to say for sure.

The following most likely describes this person’s situation is  there are not enough nonverbal messages to say for sure.

Nonverbal messages include facial expressions, gestures, loudness or tone of voice, body language, personal space, eye gaze, touch or appearance. These are all the actions taken by the movement of our body parts.

A woman wearing athletic clothing outside. The woman is stretching her legs in a lunge position. Based on the nonverbal messages one sees in the given photograph, the following most likely describes this person’s situation is  there are not enough nonverbal messages to say for sure.

Thus, the correct option is d.

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Answer:

the thermal energy absorbed is 46,893 J

Explanation:

Given;

mass of the water, m = 145 g = 0.145 kg

initial temperature of the water,  t₁ = 23 ⁰C

final temperature of the water, t₂ = 100 ⁰C

specific heat capacity of water, c = 4,200 J/kg.⁰C

The thermal energy absorbed is calculated as;

H = mcΔt

H = 0.145 x 4,200 x (100 - 23)

H = 46,893J

Therefore, the thermal energy absorbed is 46,893J

The option A is correct. When the speed of a wave remains constant and the wavelength of the wave increases, the frequency of the wave decreases.

The frequency is a measure of the number of waves that pass a point in a given period of time and the speed of a wave is inversely proportional to the frequency. As a result, when the speed of a wave decreases, the frequency of the wave decreases. When the wavelength of a wave decreases, the frequency of the wave increases. Therefore, option B is incorrect. When the speed of a wave increases by a factor of 2 and the wavelength of the wave decreases by a factor of 0.5, the frequency of the wave remains constant.

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Givne densities are,

The density of water is ρ=1 g/cm³.

Any object will float if the denisty of the object is less than the density of water, if the density of object is greater than the dnesity of water, then the object sink in the water.

In the given case, all the objects have density greater than the density of water. Therefore, all the objects will sink in the water.

Thus, option E is corret, no object will flot on the water.

If the width of the slit through which light from a red laser passes to form a diffraction pattern is increased, the width of the central maximum increases.

In the phenomenon of diffraction, light bends around the edges of obstacles or through the edges of an aperture or a slit. The pattern formed on a screen placed on the other side of the obstacle or slit is referred to as a diffraction pattern. In a diffraction pattern formed by a narrow single slit through which light from a red laser passes, the central maximum is the bright region at the center of the pattern.

The intensity of the light in the central maximum is the highest of all the diffraction maxima.The width of the central maximum increases as the width of the slit through which light from a red laser passes to form a diffraction pattern is increased. This is because when the slit width is increased, the amount of diffraction of light increases. The greater the diffraction, the wider the central maximum.

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Answer:

A.100J

Explanation:

Given parameters:

Force on car = 20N

Distance  = 5m

Unknown:

Work done  = ?

Solution:

Work done is the product of force and distance;

  Work done  = force x distance;

Insert given parameters and solve;

        Work done  = 20 x 5  = 100J

The amount of heat required to raise the temperature of 10 g of water through 2°C is 83.68 Joules.

To determine the amount of heat required to raise the temperature of 10 g of water through 2°C, we will use the formula:Q = m × c × ΔT

Where Q is the amount of heat required, m is the mass of the substance being heated, c is the specific heat capacity of the substance, and ΔT is the change in temperature.

So, for 10 g of water, the mass (m) would be 10 g.

The specific heat capacity (c) of water is 4.184 J/(g°C), so we'll use that value.

And the change in temperature (ΔT) is 2°C.

Substituting these values into the formula, we get:Q = 10 g × 4.184 J/(g°C) × 2°CQ = 83.68 Joules

Therefore, the amount of heat required to raise the temperature of 10 g of water through 2°C is 83.68 Joules.

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Answer:

2m/s²

Explanation:

F = 12 N

m = 3kg

a = ?

F = ma

a = F/m = 12/3 = 4 m/s²

when m = 6kg

a = F/m = 12/6

a = 2 m/s²

Answer:

hola me llamo bruno y tu?

Explanation:

pero yo soy de mexico

Answer:

c

Explanation:

step by step hope this helps you got this!!

A) Oil B) Wood C) 0.02J D) 3g E) Gas

The speed does not change, but direction will.

option. B

Velocity is a vector quantity that describes both the magnitude and direction of the object in motion.

When an object is travelling at a constant speed, and its direction is not changing, then the velocity of the object will be constant.

On the other hand when an object is travelling at a changing speed, and its direction is changing as well, then the velocity of the object will also change.

Thus, if the speed skaters pictured in the Figure above are traveling around the track at a constant speed, then the velocity will be constant.

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Answer:

It depends on where the arrow is showing  / direction of the resultant force.

Add for vectors in same direction, ie., 5N + 4N=9N

(arrow pointing in same direction)

Minus for different directions, ie., 5N - 4N=1N

(arrow pointing in opposite direction)

Hope this helps!

Further examples:

6N           46N

-------->   ----->

(6+4=10N)

5N            4N

<------------  ------>

(5-4=1N)

or

8N                6N

-------------->  <--------

(8-6=2N)

Answer:

997 kg/m³

Explanation:

Answer:

997 kg/m³

Explanation:

Answer:

The second law of thermodynamics states that any spontaneously occurring process will always lead to an escalation in the entropy of the universe. In simple words, it states that an isolated system's entropy will never decrease over time.

Based on the 2nd law of thermodynamics, energy is squandered more and more as it is moved or converted. It explains the connections amongst thermal energy, known as heat, and other types of energy.

It is impossible to generate or destroyed according to the First Law of Thermodynamics. According to the second law of thermodynamics, the entropy of the cosmos increases in spontaneously processes. According to the Third Law of Thermodynamics, an ideal crystal at absolute zero Kelvin has no entropy.

A crucial area of both both chemistry and physics is thermodynamics. It explores the study of electricity, the transformation of energy into various forms, and energy's capacity for work. Open, confined, and separated thermodynamic are the three types.

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Answer:

\(7,500\:\text{Watts}\)

Explanation:

Power is given by \(P=\frac{W}{\Delta t}\), where \(W\) is work and \(\Delta t\) is elapsed time. To calculated work, we'll use \(W=F\Delta x\), where \(F\) is force and \(\Delta x\) is displacement. Substituting given values, we have:

\(W=10\cdot 50\cdot 60=30,000\:\text{J}\).

Now plugging this in to our power equation, we get:

\(P=\frac{30,000}{4}=\boxed{7,500\:\text{W}}\)

Answer:

The power developed by the machine is 7700 Watt.

Explanation:

\(p = \frac{w}{t} \)

Answer:

745.4K ~ 472.3 C

Explanation:

This is an Ideal Gas Law problem where we have to manipulate the equation a bit. Let's start with the basic:

PV = nRT will be used for both the initial and final, so we will rearrange this problem to state:

(V(initial))/(T(Initial)) = nR/P

Since we know that the pressure, number of moles of He, and ideal gas constant (R) remain the same from start to finish so we can write the problem as such:

(V(initial))/(T(Initial)) = nR/P = (V(final))/(T(final))

                             or

(V(initial))/(T(Initial)) = (V(final))/(T(final))

Now lets define some of these values:

T(initial) = 25degree (assuming degrees Celsius) ~ 298.15K

V(initial) = 2.0L

V(final) = 5.0L

T(final) = ?

Since we are solving for T(final) let's rearrange the problem once more to be solving for T(final):

T(final) = (V(final)T(Initial))/V(initial)

Now plug in your values:

T(final) = (5.0L*298.15K)/(2.0L) ~ 745.4K ~ 472.3degrees Celsius

Answer:

A. Ultraviolet

Answer: A.Ultraviolet

Explanation:

just did it

Answer:

Average velocity = 82.22 km/h

Explanation:

Average Velocity = (Total distance)/(Total time)

When the car was first driven for 1 h with a velocity of 100 km/h towards the south

Velocity = Distance/time

Distance = Velocity * time

Distance covered, D1 = 100 * 1 = 100 km

When the car was driven for 0.50 h with a velocity of 50 km/h towards the north

Distance = Velocity * time

Distance covered, D2 = 50 * 0.5 = 25 km

When the car was driven for 0.75 h with a velocity of 80 km/h towards the south

Distance = Velocity * time

Distance covered, D3 = 80 * 0.75 = 60 km

Total distance traveled = D1 + D2 + D3

Total distance traveled = 100 + 25 + 60

Total distance traveled = 185 km

Total time taken = 1 + 0.5 + 0.75

Total time taken = 2.25 h

Average velocity = Total distance/ total time

Average velocity = 185/2.25

Average velocity = 82.22 km/h

A mass attached to a spring vibrates back and forth. at maximum displacement.

At the maximum displacement of a mass attached to a spring, the velocity is zero, but the acceleration is not zero.

The maximum displacement is the amplitude of the motion, at which point the restoring force of the spring is at its maximum, and the potential energy is also at its maximum.

The kinetic energy of the system is zero at the maximum displacement. As the mass attached to the spring moves towards its equilibrium position, its kinetic energy increases and its potential energy decreases, until it reaches the equilibrium position where the kinetic energy is at its maximum, and the potential energy is zero. The acceleration is zero at the equilibrium position. As the mass continues to move past the equilibrium position, the potential energy increases, and the kinetic energy decreases until it reaches the maximum displacement again, and the cycle repeats.

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The given statement "scientists are concerned about the decrease in ozone is allowing more ultraviolet" is true because ozone is a molecule made up of three oxygen atoms that exist in the Earth's atmosphere. It's a form of oxygen that absorbs almost all of the Sun's harmful ultraviolet light.

Ultraviolet rays are very harmful to humans, causing skin cancer, immune system breakdowns, and cataracts in the eyes. When the ozone layer is damaged or thinned, it can allow more ultraviolet rays to penetrate the atmosphere, which is why scientists are so concerned about ozone depletion.What are the impacts of ozone depletion?It is estimated that a 1% reduction in the ozone layer increases the incidence of non-melanoma skin cancer by 2%.A decrease of 10% in the ozone layer may result in a 20% increase in the incidence of skin cancer.The thinning of the ozone layer may result in a decrease in plant production, which may result in food supply shortages.A decrease in ozone may have an impact on phytoplankton, which play a crucial role in ocean food webs. These tiny creatures consume carbon dioxide and produce half of the world's oxygen. As phytoplankton numbers decline, ocean ecosystems may change, affecting everything from fish populations to weather patterns.

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