A dog with mass 14 kg has a kinetic energy of 135.5 J. What is the speed
of the dog?
A. 2.3 m/s
B. 5.1 m/s
C. 3.2 m/s
D. 4.4 m/s

Answer:

50.176m ; 31.36m/s ; 31.36m/s

Explanation:

Given the following :

Time (t) = 3.2s

Height(s) of the building

The initial velocity (u) will be 0

Using the equation:

S = ut + 0.5at^2

Acceleration due to gravity (a) = g = +9.8m/s^2 (downward)

S = 0*t + 0.5(9.8)(3.2^2)

S = 0 + 50.176

S = 50.176m

B.) speed impact when it touches the ground:

v^2 = u^2 + 2aS

where v is the final Velocity

v^2 = 0^2 + 2(9.8)(50.176)

v^2 = 0 + 983.4496

v = √983.4496

v = 31.36m/s

C) Speed of throw from the ground to reach the top of the building

Here we need the initial velocity

Height (s) = 50.176m

Acceleration due to gravity g = a = - 9.8m/s ( upward)

Using the third equation of motion:

S = ut + 0.5at^2

50.176 = u*3.2 + 0.5(-9.8)(3.2^2)

50.176 = 3.2u - 50.176

50.176 + 50.176 = 3.2u

100.352 = 3.2u

u = 100.352 / 3.2

u = 31.36m/s

Answer:

the answer might be A and D if not sorry

Explanation:

Answer:

Q = k M T    where k is the absorption constant, Q the heat absorbed, M the mass involved and T the temperature change (for change in temperature)

Q1 = 4.18 kJ/kg * 1 kg * 273 deg K     heat contained

Q2 = 4.18 kJ/kg * .5 kg * 373 deg K     heat contained

Q1 = 1141 kJ deg K

Q2 = 780 kJ deg K

Q = Q1 + Q2 = 1921 kJ deg K

T = 1921 / (4.18 * 1.5) deg K = 306 deg K = (306 - 273) = 33 deg Celsius

(The total mass  is now 1.5 kg)

The term that best describes the landform "dip in a mountain range" is C. Syncline.

Syncline is a term to refer to a fold of the Earth's crust caused by the tectonic effects of the earth's dynamics. A synclinal fold is characterized by being a concave fold, that is, in the shape of a U.

According to the above, answers A, B and D are not correct options because they refer to different shapes of the Earth. Therefore, the landform shown is syncline.

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Answer: C

Explanation: E2022

Work is said to be done when force applied moves a distance in the direction of the force.

The questions here relate to motion and i will try to answer each one.

1) The graph as shown represents a constant negative acceleration.

2) Given that even at constant velocity, an acceleration occurs in circular motion because the direction of motion changes hence as the carousel moves, there is acceleration; change in velocity.

3) From the diagram shown, we can see that a simple machine makes a task easier.

4) The average speed for each lap decreases. This is an example of a(n) inverse relationship.

5) When a stack of books is carried at waist level across a room, work is not being done.

6) The reason why the tortoise won is that, the tortoise moved at a constant velocity throughout the race; the hare stopped to rest periodically.

7) Work is only said to be done when the force applied moves a distance hence, work is not done because, the object has not moved.

8) The truth about the movement of the car is that the car travels at constant velocity.

9) The mechanical advantage is defined as the ratio of load to effort. Hence the mechanical advantage = 600 Ibs/150 Ibs = 4

10) The lowest gear has the greatest mechanical advantage because it requires the least work to climb the hill.

11) A pulley helps you do work because it decreases the amount of applied force.

12) The pedals on a bicycle give a mechanical advantage by allowing you to turn the pedals a short distance to turn the larger circumference of the wheels.

13) The car is traveling with a constant velocity due to the flat line of the graph.

14) The statement Mary traveled 70 miles/hour due north is velocity.

15) speed = distance/time

time = distance/speed

time = 9 m/ 2m/s = 4.5 s

16) The force needed to push the mass to the top of the ramp can be decreased by decreasing the length of the ramp.

17) The acceleration of the car is negative when the velocity of a car reduced from 50 km/h to 35 km/h over one minute.

18) Average velocity = Distance covered in a specific direction/ time

= 25 Km due east/4 hours = 6.25 km/hr due east

19) Work done = Force × distance

Distance = Work done/Force

Distance = 96 J/16 N = 6 meters

20) The most work is done when Jeremy pushed a car up a steep hill.

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That's pretty simple, we have;

We know that;

And..

Put all the values;

Therefore, the total time taken will be 92.85 sec.

The statement that stars collide with one another as often as galaxies do is false. While galaxy collisions do occur, they are relatively rare compared to the number of stars in a galaxy.

In fact, the chances of two stars colliding in our own Milky Way galaxy are extremely low. The other statements are true: collisions between spiral galaxies can result in the formation of an elliptical galaxy, the Milky Way does have two giant gamma ray emitting bubbles above and below its center, light from a quasar has been identified with a similar composition to the sun, and the Milky Way is indeed one of at least 54 galaxies in the local group. The composition of galaxies, including their stars, gas, and dust, is a complex field of study that continues to yield new insights into the nature of the universe.

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The kinetic energy (in joules) of the ball just before it hits the ground is determined using the formula KE = 1/2 mv².

In this formula, KE represents kinetic energy, m represents the mass of the ball, and v represents its velocity. The velocity of the ball just before it hits the ground can be determined using the equation v = √2gh, where g represents the acceleration due to gravity and h represents the height from which the ball was dropped.

Example:A ball of mass 0.5 kg is dropped from a height of 10 m. Given, m = 0.5 kg and h = 10 m

Acceleration due to gravity, g = 9.8 m/s²Using the equation v = √2gh,

we can determine the velocity of the ball just before it hits the ground:v = √2gh = √(2 × 9.8 × 10) = √196 = 14 m/s.

Now, we can use the formula KE = 1/2 mv² to determine the kinetic energy of the ball just before it hits the ground

KE = 1/2 mv² = 1/2 × 0.5 × (14)² = 49 J. Therefore, the kinetic energy of the ball just before it hits the ground is 49 joules.

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The type of lens shown in the ray diagram that we heave here is a convex lens. Option B

The route that light rays take as they pass through an optical device, such as a lens, mirror, or prism, is depicted graphically in a ray diagram.

Several essential components, including an object, a lens or mirror, and an image, are present in a typical ray diagram.

The ray diagram that is shown here indicates the lens type to be a convex lens as shown in the image above us.

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Missing parts;

A. Concave lens

B. Convex lens

C. Bifocal lens

Answer:

In a series circuit, the equivalent resistance is the algebraic sum of the resistances. The current through the circuit can be found from Ohm's law and is equal to the voltage divided by the equivalent resistance. The potential drop across each resistor can be found using Ohm's law.

The work done by the dog is 0.81J.

Work done is a measure of energy expended in moving an object; most commonly calculated by multiplying the force by the distance.

It is said that no work is done if the object does not move.

The work done on an object is the amount of energy transferred to an object through work.

According to this question, a dog lifts a 0.75 kg bone straight up through a distance of 0.11 m. The force applied to break the bone must be calculated first as follows:

Force = mass × acceleration

Force = 0.75kg × 9.8m/s²

Force = 7.35N

Work done = 7.35N × 0.11m = 0.81J

Therefore, 0.81J is the work done by the dog.

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The stars in a constellation are completely unrelated to one another. An arrangement of stars is called a constellation.

In astronomy, a constellation is a collection of stars that collectively form a particular fictitious pattern. Due to the identification and naming of these patterns over time, there are currently 88 constellations, including constellations like Orion and Aquarius.

Additionally, constellations serve a variety of functions because navigators have employed them for ages. For instance, a navigator may find Polaris, which denotes the North Pole, by pinpointing the constellation Ursa Minor. Additionally, it has made it possible for astronomers to find objects like planets. This suggests that constellations are designated star patterns used in astronomy and navigation.  

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Seasonal changes impact the environment. is There are only two factors that affect your environment.

Seasonal affective disorder, a clinically diagnosed syndrome, is believed to represent the morbid extreme of a spectrum of seasonality. Two types of seasonality have been clinically described: one characterized by a winter pattern and a second by a summer pattern of depressive mood disturbance.

Seasonality is a characteristic of a time series in which the data experiences regular and predictable changes that recur every calendar year. Any predictable fluctuation or pattern that recurs or repeats over a one-year period is said to be seasonal.

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Answer:

t = 1.24 seconds

Explanation:

Given that,

Velocity of the ball, u = 30 m/s

Height, h = 45 m

We need to find how much time will it take the ball to reach a height of 45 m. Let the time be t.

Using the second equation of motion to find it.

\(h=ut+\dfrac{1}{2}at^2\\\\45=30t+\dfrac{1}{2}\times 9.8\times t^2\\\\45=30t+4.9t^2\\\\30t+4.9t^2-45=0\\\\t=1.24\ s\ \text{and}\ -7.36\ s\)

Neglecting negative value,

The ball will reach to a height of 45 m in 1.24 seconds.

332734.34 Joules

Explanation

Kinetic energy is a form of energy that an object or a particle has by reason of its motion and mass, it is represented by the expression

then

Step 1

a) Let

b) now,replace in the formula:

therefore, the answer is 332734.34 Joules

I hope this helps you

False.In a hash table data structure, the time complexity for finding a value (retrieving an element) is typically O(1) on average, assuming a good hash function and a well-distributed set of keys. This means that the time it takes to find a value is constant, regardless of the size of the data structure.

On the other hand, in a doubly linked list data structure, finding a value requires traversing the list from the beginning or end until the desired value is found. The time complexity for finding a value in a doubly linked list is O(n), where n is the number of elements in the list. This means that the time it takes to find a value in a doubly linked list increases linearly with the size of the list.Therefore, it takes more time to find a value in a doubly linked list data structure compared to a hash table data structure.

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A compass works the way it does because Earth has a magnetic field that looks a lot like the one in a magnet.

The Earth's field is completely invisible, but it can be felt by a compass needle on the Earth's surface, and it reaches thousands of miles out into space.

Mathematically, the magnetic field is represented as a vector field. This vector field can be easily visualized as a collection of several vectors laid out in a grid. Each vector has a length based on the strength of the magnetic field and points in the same direction as a compass would.

This method is demonstrated by placing a grid of numerous small compasses in a magnetic field. The only distinction is that a compass does not reveal the strength of a field in this instance.

Therefore, A compass works the way it does because Earth has a magnetic field that looks a lot like the one in a magnet.

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The stage during which a star has an inert helium core is the red giant phase. As a star age, it undergoes nuclear fusion reactions that cause it to expand and become less dense. In the case of low to intermediate-mass stars (such as our Sun), this expansion causes the star to become a red giant.

During this phase, the outer layers of the star expand and cool, causing it to appear reddish in color. At the same time, the core of the star becomes hotter and denser as it continues to fuse hydrogen into helium.

Eventually, the hydrogen in the core is depleted and the star switches to fusing helium into heavier elements. This causes the core to shrink and become hotter, but the outer layers of the star continue to expand. As a result, the helium in the core becomes inert and nonburning. The star will eventually shed its outer layers, leaving behind a small, hot core known as a white dwarf.

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A) Minimum recommended spiral parameter: 150.03m.

b) Distance P: 150.03m.

c) Distance Q: 4.122m.

d) Angle Φs: 16°30'14.0".

e) Distance Tc: 150.03m.

a) Calculation for the minimum recommended spiral parameter:

Design radius (R) = 300 m

Maximum superelevation (e_max) = 0.06 m/m

Spiral Parameter (A) = (R + e_max) / 2

A = (300 m + 0.06 m/m) / 2

A ≈ 150.03 m

b) Calculation for the distance P:

Distance P is equal to the length of the first spiral curve, which is the same as the minimum recommended spiral parameter.

P ≈ 150.03 m

c) Calculation for the distance Q:

Distance Q represents the length of the circular curve. It is given by the formula:

Q = (Deflection angle at Point of Intersection) / (Degree of Curve, D)

Deflection angle at Point of Intersection = 16°30'14.0"

Converting the angle to decimal degrees:

16° + (30'/60) + (14.0"/3600) = 16.504°

Q = 16.504° / (360° / D)

Q ≈ D / 21.814

Since the RAU80 has 4 lanes, the degree of curve (D) is 360° / 4 = 90°.

Q ≈ 90° / 21.814

Q ≈ 4.122 m

d) Calculation for the angle Φs:

The angle Φs is the deflection angle at the Point of Intersection.

Φs = 16°30'14.0"

e) Calculation for the distance Tc:

Distance Tc is equal to the length of the second spiral curve, which is the same as the minimum recommended spiral parameter.

Tc ≈ 150.03 m

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Light will reflect at the same angle off a smooth surface as when it first touches it. The direction of reflected light beams for a flat surface is the same. Specular reflection is what is happening here.

When light reflects off of a surface, it happens. Light will reflect at the same angle it was incident upon if the surface is glossy and smooth.

A smooth polished surface is what is referred to as a reflection when a light ray strikes it and bounces back. Surface reflection occurs when a light beam hits it and then leaves it.

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Answer: The part of color that's reflected is the red that bounces off the paper.

Hope this helps you!!!

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OPTION  B IS THE ANSWER

Answer:

The real answer is A 2023 answer -_-

Explanation:

The statement that correctly describes the movement of thermal energy according to the second law of thermodynamics is "The natural tendency of systems is for heat to flow from a cooler object to a warmer one."

This principle is known as the law of heat flow, which states that heat energy will spontaneously transfer from regions of higher temperature to regions of lower temperature.

This process continues until thermal equilibrium is reached, where the objects or systems involved have the same temperature. It is important to note that the second law of thermodynamics also encompasses the concept of entropy, which states that in an isolated system, entropy tends to increase over time, leading to a more disordered state.

However, the statement specifically focuses on the direction of heat flow based on temperature differences.

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Complete question :

Which statement correctly describes the movement of thermal energy according to the second law of thermodynamics?

-The natural tendency of systems is for heat to flow from a cooler object to a warmer one.

-The natural tendency of systems is to evenly distribute energy until the objects are the same temperature.

-The natural tendency of systems is for heat to flow continuously between objects of the same temperature.

Answer: Wave a the first answer is right

Brainliest.

Explanation:

The barge will Motion 252 m³ of water while maintaining a 2.00 m top height above the water.

An object in motion maintains a straight course and a steady speed until it is affected by an unbalanced force. An object at rest maintains its state of rest. The mass of an item and the force acting on it define the acceleration of that thing.

The barge's displacement of water is proportional to its volume below the waterline.

The following formula may be used to determine the barge's volume:

Volume of barge = length × width × depth

Volume of barge = 14.0 m × 9.0 m × 4.0 m

Volume of barge = 504 m³

The top section of the barge is 2.00 m deep, so its volume can be calculated as follows:

Volume of top section = length × width × depth

Volume of top section = 14.0 m × 9.0 m × 2.0 m

Volume of top section = 252 m³

Now, the barge's displacement of water may be computed as follows:

Volume of water displaced = Volume of barge - Volume of top section

Volume of water displaced = 504 m³ - 252 m³

Volume of water displaced = 252 m³.

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Answer:

travels

Explanation:

hope this helps and have a blessed day

To design a resistor network with an equivalent resistance of 360Ω using only 300Ω and 600Ω resistors, we can use the series and parallel resistor combinations to achieve the desired resistance.

Option 1: Using as many resistors as desired:

One possible configuration is to connect a 600Ω resistor in series with two 300Ω resistors in parallel. This can be represented as follows:

600Ω -- 300Ω -- 300Ω

The equivalent resistance of two 300Ω resistors in parallel is 150Ω. So, the total equivalent resistance of the network is:

600Ω + 150Ω = 750Ω

This configuration does not result in an equivalent resistance of 360Ω using only 300Ω and 600Ω resistors.

Option 2: Using the fewest possible resistors:

To achieve an equivalent resistance of 360Ω with the fewest possible resistors, we can combine the 300Ω and 600Ω resistors in series and parallel connections.

One possible configuration is to connect a 300Ω resistor in series with a parallel combination of a 600Ω resistor and a 300Ω resistor. This can be represented as follows:

300Ω -- (600Ω -- 300Ω)

The parallel combination of a 600Ω and a 300Ω resistor is calculated as follows:

1 / (1/600Ω + 1/300Ω) = 200Ω

Now, we have the series combination of a 300Ω resistor with a parallel combination of a 600Ω and a 300Ω resistor, resulting in an equivalent resistance of:

300Ω + 200Ω = 500Ω

This configuration does not result in an equivalent resistance of 360Ω using only 300Ω and 600Ω resistors.

Therefore, it is not possible to design a resistor network using only 300Ω and 600Ω resistors to achieve an equivalent resistance of 360Ω.

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