a boy delivering magazines travels 11.4 blocks west, 10.8 blocks north, and then 2.4 blocks south. what is the angle of rotation of her displacement using west as reference?

a. speed b. direction c. Magnitude d. Direction

Answer:

1. The formula for speed is speed = distance ÷ time. To work out what the units are for speed, you need to know the units for distance and time

2. 36÷4= 9

(formula) Speed = distance ÷ time

3. Meter (M) centimeter (cm) kilometers (km)

4. Seconds , Hour, Minute

5. 65÷13=5 (object A)

125÷ 25= 5 (object B)

their both Equal of the amount of speed, so they are travelling at the same speed

Hope I helped

So, the volume of cone of whole number is 94.

Frist step should be: To find the volume First, take the measurement of the diameter (broad measurement you can take of the base), then measure or evaluate the height. If you earlier have plans or schematics, just get the lengths from there.

change the length units to the same base, e.g., centimeters or inches, then follow the formula above or use our online volume of a cone calculator.

The output is all the time in cubic units, e.g., cubic feet, cubic inches, cubic yards, cubic mm, cubic cm, cubic meters, and so on.

The cone is not as famous as some other bodies in construction and engineering, but it has its uses.

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The shortest distance in which the car can stop, after the brakes are applied, without the groceries sliding off the seat is 27.5 m.

We can use the equations of motion for constant acceleration to solve this problem. The acceleration of the car when the brakes are applied is given by, a = -μg, where μ is the coefficient of friction, g is the acceleration due to gravity (9.8 m/s^2), and the negative sign indicates that the acceleration is in the opposite direction to the motion of the car. We need to find the distance, d, that the car travels before coming to a stop.

v^2 = u^2 + 2as

where v is the final velocity (0 m/s), u is the initial velocity (16 m/s), a is the acceleration (-μg), and s is the distance traveled.

Solving for s,

s = (v^2 - u^2) / (2a)

Plugging in the values,

s = (0 - (16 m/s)^2) / (2(-0.65)(9.8 m/s^2)) = 27.5 m

So the car will travel 27.5 m before coming to a stop.

Now we need to check if the groceries will slide off the seat during braking. The maximum force of friction that the seat can exert on the groceries is given by,

F_friction = μ_friction * F_normal

where μ_friction is the coefficient of friction (0.45 for kinetic friction), and F_normal is the normal force exerted by the seat on the groceries. The normal force is equal to the weight of the groceries, which is,

F_normal = m * g = 7.0 kg * 9.8 m/s^2 = 68.6 N

So the maximum force of friction is,

F_friction = 0.45 * 68.6 N = 30.9 N

The force of friction during braking is given by,

F_braking = m * a = 7.0 kg * (-0.65) * 9.8 m/s^2 = -45.4 N

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The answer is heat flow.

When two systems in contact are not at the same temperature, heat flow occurs.

What is heat flow?

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Answer:

Explanation:

When two systems in contact are not at the same temperature, Heat flow occurs.

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The main difference between Kinetic energy and Potential energy is that kinetic energy refers to movement while potential energy refers to storage.

Kinetic energy is a type of energy in motion or energy in movement such as a turbine (mechanical energy), while Potential energy refers to the energy that is stored to be used when required (e.g. chemical bonds of foods).

Therefore, with this data, we can see that  Kinetic energy is used as movement, while Potential energy is stored to be used in the future.

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The required diameter for certified-capacity liquid rupture discs for the given conditions are 6.08 inches for 500 gpm, 3.07 inches for 100 gpm, 1.29 inches for 5 m/s, and 1.60 inches for 10 m/s.

To calculate the required diameter for certified-capacity liquid rupture discs for the given conditions, we first need to determine the burst pressure for each case. The burst pressure is calculated using the following formula:
Burst Pressure = Set Pressure + Overpressure - Backpressure
Using the specific gravity of 1.2 for all cases, we can calculate the burst pressure for each scenario as follows:
a. 500 gpm: Burst Pressure = 100 psig + 50 psig - 10 psig = 140 psig
b. 100 gpm: Burst Pressure = 100 psig + 50 psig - 5 psig = 145 psig
c. 5 m/s: Burst Pressure = 10 barg + 1 barg - 0.5 barg = 10.5 barg
d. 10 m/s: Burst Pressure = 20 barg + 2 barg - 1 barg = 21 barg
Once we have the burst pressure, we can use the specific gravity and the following formula to calculate the required diameter of the rupture disc:
Diameter = (Flow Rate * 60 * Specific Gravity) / (Burst Pressure * 0.8 * 3.14)
Where:
Flow Rate = Liquid flow in gallons per minute (gpm) or meters per second (m/s)
Specific Gravity = 1.2
Burst Pressure = Calculated burst pressure in psig or barg
Using the above formula, we can calculate the required diameter for each scenario as follows:
a. 500 gpm: Diameter = (500 * 60 * 1.2) / (140 * 0.8 * 3.14) = 6.08 inches
b. 100 gpm: Diameter = (100 * 60 * 1.2) / (145 * 0.8 * 3.14) = 3.07 inches
c. 5 m/s: Diameter = (5 * 60 * 1.2) / (10.5 * 0.8 * 3.14) = 1.29 inches
d. 10 m/s: Diameter = (10 * 60 * 1.2) / (21 * 0.8 * 3.14) = 1.60 inches
Therefore, the required diameter for certified-capacity liquid rupture discs for the given conditions are 6.08 inches for 500 gpm, 3.07 inches for 100 gpm, 1.29 inches for 5 m/s, and 1.60 inches for 10 m/s.

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The combination of higher mass and lower elasticity in a bowling ball results in a more painful experience when compared to kicking a soccer ball.

Kicking a bowling ball is more painful than kicking a soccer ball because of the differences in their masses and elasticity. The pain experienced when kicking an object is determined by the transfer of kinetic energy and the interaction between the object and the body.

A bowling ball is much heavier and has a higher mass compared to a soccer ball. When you kick a bowling ball, it has a greater amount of momentum, which is the product of mass and velocity. The higher momentum results in a greater force being exerted on your foot upon impact, leading to a higher level of discomfort or pain.

In addition, the elasticity of the objects plays a role. Soccer balls are designed to be more elastic, allowing them to absorb and distribute the impact force more effectively. This elasticity helps to reduce the amount of force transmitted back to your foot, resulting in less pain. On the other hand, bowling balls are typically less elastic, leading to a greater transfer of force and more discomfort when kicked.

Overall, the combination of higher mass and lower elasticity in a bowling ball results in a more painful experience when compared to kicking a soccer ball.

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Under the assumption of a single point charge of +1.0 C located at the origin, the magnitude of the electric field at point P on the positive x-axis at x = 40.0 cm is approximately 56.25 × 10^9 N/C.

To determine the magnitude of the electric field at point P on the positive x-axis, we need additional information such as the configuration of charges or the distribution of the electric field sources.

Without that information, it is not possible to provide a specific value for the electric field magnitude at point P.

However, if we assume a simple scenario where there is a point charge located at the origin (x = 0) and no other charges or sources nearby, we can use Coulomb's law to calculate the electric field magnitude at point P.

Coulomb's law states that the electric field magnitude created by a point charge is given by:

E = k * (Q / r^2)

Where:

- E is the electric field magnitude.

- k is Coulomb's constant, approximately equal to 9 × 10^9 N m²/C².

- Q is the charge of the point charge.

- r is the distance between the point charge and the point where the electric field is being measured.

Let's assume a point charge Q = +1.0 C at the origin (x = 0) and calculate the electric field magnitude at point P, located at x = 40.0 cm (0.40 m):

r = 0.40 m

Q = +1.0 C

k = 9 × 10^9 N m²/C²

Plugging these values into the equation, we have:

E = (9 × 10^9 N m²/C²) * (1.0 C) / (0.40 m)^2

Simplifying further:

E = (9 × 10^9 N m²/C²) * (1.0 C) / (0.16 m²)

E = 56.25 × 10^9 N/C

Therefore, under the assumption of a single point charge of +1.0 C located at the origin, the magnitude of the electric field at point P on the positive x-axis at x = 40.0 cm is approximately 56.25 × 10^9 N/C.

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Answer:

The answer is E

Explanation:

Wolves died off from the rona virus back in the 1930s so when they came back they brought C- 19 with them

Answer: the weight of the boat is approximately 267.975 N.

Explanation:

The weight of the boat can be calculated as follows:

Find the buoyant force acting on the boat:

The buoyant force is equal to the weight of the water displaced by the boat. Since half of the boat is submerged under water, the buoyant force is equal to the weight of the volume of water equal to half the volume of the boat.

The density of water is approximately 1000 kg/m³. The volume of the boat is equal to the volume of the water displaced by the boat. Therefore, the volume of water displaced by the boat is:

(1/2) x (volume of the boat)

The weight of this volume of water is:

(weight of water) = (density of water) x (volume of water) x (acceleration due to gravity)

(weight of water) = 1000 kg/m³ x (1/2) x (volume of the boat) x 9.81 m/s²

Find the weight of the boat:

The weight of the boat is equal to its mass times the acceleration due to gravity:

(weight of the boat) = (mass of the boat) x (acceleration due to gravity)

(weight of the boat) = 55 kg x 9.81 m/s²

Now, we can calculate the weight of the boat as:

(weight of the boat) = (weight of water displaced by the boat)

(weight of the boat) = 1000 kg/m³ x (1/2) x (volume of the boat) x 9.81 m/s²

55 kg x 9.81 m/s² = 1000 kg/m³ x (1/2) x (volume of the boat) x 9.81 m/s²

(volume of the boat) = 55 kg / (1000 kg/m³ x (1/2))

(volume of the boat) = 0.055 m³

(weight of the boat) = (weight of water displaced by the boat)

(weight of the boat) = 1000 kg/m³ x (1/2) x 0.055 m³ x 9.81 m/s²

(weight of the boat) = 267.975 N

Therefore, the weight of the boat is approximately 267.975 N.

Explanation:

Given that the first ball is thrown vertically and upward.

since it reaches the throwers hand after 3 seconds, then the time taken to reach maximum height is

= T/2

=3/2

=1.5 seconds

Also, the projection angle for the second ball is 30°

we know that at maximum height vertical velocity is 0

therefore the final velocity of the first ball is

Vy= 0

Also, since the first ball is thrown upward the horizontal velocity is 0

Vx=0

from the first law of motion

Vy=u+at

Vy=0, a= -g

Uy=gt

Uy=9.81*1.5

Uy=14.7m/s

since both reach the same height, they will have the same vertical velocity

Uy= Vo sin∅

Vo=Uy/sin∅

Vo= 14.7/sin 30

Vo=29.4m/s

entirely KE type of energy is present when the baseball reaches the apex of the throw.

Motion is created by kinetic energy. Kinetic energy is produced by the players who swing the bat and throw the ball, and it is present in both the swinging bat and the pitched ball.

The ball will only have kinetic energy when it is thrown since the  would be zero (taking reference at the same position). The speed of the ball, or its kinetic energy, diminishes as it rises, but its height, or its potential energy, increases.

The ball's kinetic energy is dwindling and its gravitational potential energy is rising as it ascends. The cannon ball's kinetic energy is zero when it reaches the top of its arc.

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Answer: A, D, A

Explanation:

Answer:

1st answer is right give them brainliest

Explanation:

i took the test and got it right

Given data

*The given height of the building h = 56 m

*The distance from the base is d = 45 m

*The value of the acceleration due to gravity is g = 9.8 m/s^2

The formula for the time taken by the lemming is given as

Substitute the known values in the above expression as

The formula for the lemming's initial speed is given as

Substitute the known values in the above expression as

Hence, the lemming's initial speed is v = 13.3 m/s

Answer:

D. muscular strength

Explanation:

Lifting any weight requires force to lift it. This force is the result of the muscular strength of the body. It is the muscular strength that determines the weight that a body can lift without any exhaustion. Muscular strength depends on the size of the muscular fibers and the nerves' ability. They help in activating the strength of the muscle. Lifting the objects and the ability to lift it are the outcome of the strength muscles have.

In the given situation, Dawn is trying to find her muscular strength.

Answer:

d

Explanation:

d

Answer: B) zero because both objects are at rest

Explanation:

Given the following :

Mass of anchor = 10kg

Mass of boat = 1000kg

Note : both boay and anchor are at rest, this gives a Velocity of zero

The momentum of a body is given as the product of Mass and velocity, that is,

Momentum = mass × velocity

Initial Momentum of anchor-boat system =

(mass of boat× initial velocity of boat) + (mass of anchor × initial velocity of anchor)

Initial Velocities of boat and anchor = 0

Therefore,

Initial momentum = (1000 × 0) + (10 × 0)

Initial momentum = (0 + 0) = 0

This is ecause both objects are at rest.

Answer:

False, Sunspots appear dark (in visible light) due to their low temperature(cooler) than rest of the sun

Explanation:

Sunspots appear dark because they are much cooler( have low temperature than the rest of the surface contained by Sun. As they appear dark, but still they have very temperature that's why so hot. Sunspots have temperatures ranges  3,500 Celsius (3773 kelvin) and the surrounding surface of the sun has a temperature much higher of about 5,500 Celsius(5773 Kelvin). Even if we see a sunspot alone in space,  it will glow so brightly.

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In the experiment, the researcher investigates the relationship between effort distance and the applied effort on lifting a load, with effort distance as the independent variable, the applied effort as the dependent variable, and load weight and surface angle as controlled variables.

i. The variables involved in this experiment are:

Effort distance (E.d.): The distance over which the effort force is applied.

Load distance (L.d.): The distance over which the load is lifted.

Effort applied: The force exerted by the researcher to lift the load.

ii. The variables that need to be controlled in this experiment are:

Load weight: The weight of the load should be kept constant to ensure that only the effort distance is being tested.

Surface angle: The slanted surface angle should be consistent for each trial to isolate the effect of effort distance.

iii. The independent, dependent, and controlled variables can be identified as follows:

Independent variable: Effort distance (E.d.) is the independent variable as it is intentionally varied by the researcher to observe its effect on the effort applied.

Dependent variable: The dependent variable is the effort applied. It is measured or observed and expected to change based on the different effort distances.

Controlled variables: The load weight and surface angle are controlled variables. They are kept constant throughout the experiment to eliminate their influence on the results and isolate the effect of effort distance.

Therefore, Using effort distance as the independent variable, applied effort as the dependent variable, load weight and surface angle as the controlled variables, the researcher conducts an experiment to examine the link between these two factors when lifting a load.

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The shape is connected in parallel so;

5.1) Ans;

\( \frac{1}{R} = \frac{1}{R1} + \frac{1}{R2} \\ \frac{1}{R} = \frac{1}{2} + \frac{1}{3} \\ \frac{1}{R} = \frac{3 + 2}{6} = \frac{5}{6} \\ R = \frac{6}{5} = 1.2 \: \: ohm\)

5.2) Ans;

\( \frac{1}{R} = \frac{1}{R1} + \frac{1}{R2} \\ \frac{1}{R} = \frac{1}{8} + \frac{1}{10} \\ \frac{1}{R} = \frac{5 + 4}{40} = \frac{9}{40} \\ R = \frac{40}{9} = 4.4 \: \: ohm\)

I hope I helped you^_^

Answer:

Timezones exist because of rotation and revolution

Explanation:

As Earth rotates on its axis, it moves about 15 degrees every 60 minutes. After 24 hours, it has completed a full rotation of 360 degrees. The scientists used this information to divide the planet into 24 sections or time zones. Each time zone is 15 degrees of longitude wide.

The GPE that the barbells have at max height is ,

3680.h j=11,000 units

where h= maximum height the barbells were lifted

work done by the championship lifter ,W = 11,000 units

weight of the barbells, N = 3680 N

The gravitational potential energy, P.E., the barbells had at their maximum height of lift is given as follows;

P.E. = m × g × h

Where;

m = The mass of the barbells;

g = The acceleration due to gravity = 9.8 m/s^2

h = The maximum height to which the barbells are lifted

m × g = The weight of the barbells = 3680 N

∴ P.E. = 3680 N × h = 3680·h J

we know the law of conservation of energy, according to this the work done by the weight lifter is equals to the maximum gravitational potential energy gained by the barbell is equal to energy at maximium height i.e P.E

therefore, GPE = 3680.h j = W = 11,000j is your answer.

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When a light bounces off the surface of a metal cup and shines in Harold's eyes, the light waves undergo reflection. Reflection occurs when a wave encounters a boundary between two media and bounces back into the original medium.

When a light wave strikes the surface of the metal cup, some of the energy from the light is absorbed by the metal, causing electrons in the metal to become excited and move to higher energy levels. These excited electrons then release the energy they have absorbed by emitting new light waves, in a process called reflection. The reflected light waves bounce off the surface of the metal cup in many different directions, including towards Harold's eyes. When these waves enter Harold's eyes, they stimulate the cells in his retina, which sends electrical signals to his brain. His brain then processes these signals as visual information, allowing him to see the cup and the reflected light.

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

m is the mass in kg

v is the velocity in m/s

From the question

m = 20 kg

v = 2.5 m/s

From the question we have

\(k = \frac{1}{2} \times 20 \times {2.5}^{2} \\ = 10 \times 6.25 \\ = 62.5\: \: \: \: \: \: \: \: \: \: \)

We have the final answer as

Hope this helps you

Answer:

C. Surface area

Explanation:

The rate of  chemical reaction depends on various factors such as:

Effect of surface area of reactants: the rate of a chemical reaction can be increased by increasing the the area of contact of the reacting substances. This is especially important when one or more of the reactants are solids., because only the particles of the solid that are exposed are able to take part in the reaction at each instant of time. Therefore, the greater the surface area of the solid reactant particles the faster the reaction.

The surface area of solid reactants can be increased by grinding or pelletizing, thus allowing for a greater contact between the reacting particles,

The instance in which one of the solid reactants was treated in a coffee grinder before adding to the reaction container is one way of increasing the surface area of a reactant.

To determine the current in each wire, we need to know the voltage applied and the resistance of the wire.

To determine the current in each wire when the cords hang at an angle of 6.00 ∘ with the vertical, we need to consider the forces acting on the cords. Gravity pulls the cords downwards, while tension in the wires pulls them upwards. Since the cords are at an angle, we can resolve the forces into their vertical and horizontal components.

Assuming that the cords and wires are perfectly vertical, we can use the sine and cosine functions to calculate the components of the tension force. Let's assume that the total tension force in each wire is T.

The vertical component of the tension force is Tcos(6.00 ∘), while the horizontal component is Tsin(6.00 ∘). Since the cords are in equilibrium, the sum of the vertical forces must be equal to the weight of the cords, which we can assume is negligible. Therefore, the current in each wire is given by:

I = Tcos(6.00 ∘)

We can use Ohm's law to relate the current to the resistance of the wire and the voltage applied to it. If we know the voltage, we can calculate the current using:

I = V/R

where R is the resistance of the wire. Therefore, to determine the current in each wire, we need to know the voltage applied and the resistance of the wire.

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Answer:

The difference is that water is an incompressible fluid — its density is almost constant as the pressure changes — while air is a compressible fluid — its density changes with pressure. ... Atmospheric pressure is the pressure exerted on a surface by the weight of the atmosphere (a compressible fluid) above it

Explanation:

change some words

Metals have shiny apperances