A 40 kg boy standing on a skateboard throws a 2 kg ball 20 m/s to the left.
a. What is the ball's momentum?
O 10 kg m/s
O 20 kg mis
O 40 kg m/s
O 1 kg m/s

According to the given position vs time graph, at the 5th minute, David first starts to move at a positive velocity in the forward direction. Therefore, option D is correct.

The position vs time graph can be defined as where the instantaneous position is plotted on the y-axis and the time is plotted on the x-axis is called a Position vs. time graph.

In the position vs time graph, draw an independent variable on the x-axis while dependent variables will be plotted on the y-axis. The dependent variable should be dependent on the independent variable.

In the given graph the slope of the graph is positive after the fifth minute. The slope of the position vs time graph is representing the velocity. Therefore, David first starts to move at a positive velocity at 5 minutes.

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Answer:

1.84 m

Explanation:

For the small lead ball to be balanced at the tip of the vertical circle just before it is released, the reaction force , N equal the weight of the lead ball W + the centripetal force, F. This normal reaction ,N also equals the tension T in the string.

So, T = mg + mrω² = ma where m = mass of small lead ball, g = acceleration due to gravity = 9.8 m/s², r = length of rope = 1.10 m and ω = angular speed of lead ball = 3 rev/s = 3 × 2π rad/s = 6π rad/s = 18.85 rad/s and a = acceleration of normal force. So,

a = g + rω²

= 9.8 m/s² + 1.10 m × (18.85 rad/s)²

= 9.8 m/s² + 390.85 m/s²

= 400.65 m/s²

Now, using v² = u² + 2a(h₂ - h₁)  where u = initial velocity of ball = rω = 1.10 m × 18.85 rad/s = 20.74 m/s, v = final velocity of ball at maximum height = 0 m/s (since the ball is stationary at maximum height), a = acceleration of small lead ball = -400.65 m/s² (negative since it is in the downward direction of the tension), h₁ = initial position of lead ball above the ground = 1.3 m and h₂ = final position of lead ball above the ground = unknown.

v² = u² + 2a(h₂ - h₁)

So, v² - u² = 2a(h₂ - h₁)

h₂ - h₁ =  (v² - u²)/2a

h₂ =  h₁ + (v² - u²)/2a

substituting the values of the variables into the equation, we have

h₂ =  1.3 m + ((0 m/s)² - (20.74 m/s)²)/2(-400.65 m/s²)

h₂ =  1.3 m + [-430.15 (m/s)²]/-801.3 m/s²

h₂ =  1.3 m + 0.54 m

h₂ =  1.84 m

Answer:

The atomic number

Explanation:

Answer:

2.5 seconds

Explanation:

Time is equal to distance over speed

300 divide by 120 u get 2.5 seconds

In this scenario, the phrase Shampoo Chic we are unique is the message.

One possible scenario is moving to a city. The most likely scenario is he returns to school in the fall. In the best-case scenario, I'll finish the work by tomorrow. Uncountable noun When something happens in real life, it actually happens, not just in a story or someone's imagination. They looked at each other and weighed the situation.

The course of the event series of expansions. Your scenario is very similar to your situation, but it hasn't happened yet, and Shampoo Chic may not happen at all. A scenario is a story that unfolds as a logical consequence of previous actions or events. It is a prediction of the future and must be written as if the future were the present. A usage scenario describes how someone might use an existing product or system. A design scenario is a description of the intended use of the product or system being designed.

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The first law states that the internal energy change of that system is given by Q − W . Since added heat increases the internal energy of a system, Q is positive when added to the system and negative when removed from the system.

ANSWER:

13.6 m/s

STEP-BY-STEP EXPLANATION:

The speed of the impact would be the resulting velocity between the initial velocity (which according to the statement is a vertical velocity) and the horizontal velocity.

Now we know the vertical and horizontal components of velocity we can find the resultant by means of the Pythagorean theorem. Using Pythagoras we can say that:

Therefore, the impact speed is 13.6 m/s

The temperature would rise by 1.8 degrees Fahrenheit if it went from 20 to 21 degrees Celsius.

Since 1880, the Earth's temperature has increased by an average of 0.14° F (0.08° C) per decade, or nearly 2° F overall. Since 1981, the pace of warming has increased more than double, to 0.32° F (0.18° C) every decade.

To assist us remember that as we move up the scale, we go from colder to hotter, let's label our thermometer. In other terms, a higher number of Fahrenheit degrees is hotter than a lower number of Fahrenheit degrees.

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Answer:

A compound

Explanation:

A compound is a substance formed when two or more elements are chemically joined

Answer:

Compound

Explanation:

A compound is a substance derived from the chemical combination of two or more elements

e.g Water ;

= \(H_2O\\Hydrogen\:and\:Oxygen\)

Salt ;

\(NaCl\\Sodium\:and\: Chlorine\)

According to the question the tension in each wire is 1.96 N.

Tension is a term that describes the psychological and physical state of a person or system in which there is a high degree of stress, uncertainty, and anxiety. It is often associated with conflict and is often experienced when individuals or groups feel threatened or constrained in some way. Tension can be experienced in a variety of different contexts, from interpersonal relationships to the workplace. It can result from a variety of different factors, including a lack of communication, conflicting goals or expectations, and unmet needs.

The body is in equilibrium when the sum of all forces acting on it is equal to zero. In this case, the forces acting on the metal tube are the two wires and the weight of the tube due to gravity.

The tension in each wire is equal to the weight of the tube divided by the length of the tube. This is because the tube is suspended horizontally, so the forces in each wire must be equal in order to keep the tube in equilibrium.

Therefore, the tension in each wire is:

T = (9 kg × 9.8 m/s2) / (5 cm × 0.01 m)

= 1.96 N

Therefore, the tension in each wire is 1.96 N.

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Answer:

A thermometer has a glass tube sealed at both ends and is partly filled with a liquid like mercury or alcohol. As the temperature around the thermometer's bulb heats up, the liquid rises in the glass tube. ... When it is hot, the liquid inside the thermometer will expand and rise in the tube.

Answer:

Curran is testing out a newly waxed hallway floor by sliding in his socks.

He runs from one end of the hallway and starts sliding midway going all

the way to the right. The forces acting on Curran as he is sliding are

represented in the diagram below. Identify the forces and match them

correctly to the n

3.37 ev  is the maximum kinetic energy in eV of electrons ejected from sodium metal by 2.2 x 102-nm EM radiation

E=hc/ λ

E= \((6.63 *10^-34*3*10^8/220 *10^-9\)

E=5.65-2.28

E=3.37eV

A moving item or particle might have power of a certain sort called kinetic energy. When work, which entails the transfer of energy, is done on an object by applying a net force, that object acquires kinetic energy. Kinetic energy, which depends on an item or particle's mass and velocity of motion, is a property of motion. Any combination of vibration, axis rotation, translation (or movement along a route from one place to another), and translation are all examples of motion. The translational kinetic energy of a body is equal to 1/2mv2, which is calculated by multiplying the mass, m, by the square of the speed, v.

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We will have the following:

a) First, we know that light travels at 299 792 458 m/s. So:

So, light will travel 17987547480 meters in 60 seconds.

b) We will have the following:

So, there are 9980 centiliters in 9.98*10^-9 decaliters.

Answer:

Explanation:

We shall apply newton's law equation valid for rotational motion .

ωt = ω₀ + α t where ωt  is angular velocity after time t , ω₀ is angular velocity at t= 0 and α is angular acceleration

145 = 0 + α x 5.8

α = 25 rad / s²

B )

θ = ω₀ t +  1/2 α t²

= 0 + .5 x 25 x 5.8 x 5.8

= 420.5 rad .

Answer:

gravitational potenetial energy =ℎ

Explanation:

none

Birds underwent significant diversification and adaptation during the Mesozoic epoch, allowing them to develop into effective and adaptable flyers.

The wings of S. crossirostris, also referred to as the "delicate-winged pterosaur," were constructed of a delicate flap of skin called the patagium. This delicate membrane was prone to breaking, unlike the stiff feathers of birds.

In terms of flight prowess and ecological success, S. crossirostris would not have been able to compete with birds due to the restrictions imposed by its delicate wing structure.

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Answer:

6.79 m/s

Explanation:

By applying the principle of conservation of momentum.

The total momentum = MV - mv = 0 (since the squid is beginning at rest)

the mass of the squid (M) in absence of water in its cavity = (6.5 - 1.75) kg

= 4.75 kg

speed of the squid (V) = 2.5 m/s

mass of the water expelled (m) = 1.75 kg

speed of the water (v) = ???

∴

4.75 × 2.5 = 1.75 × v

\(v = \dfrac{4.75 \times 2.5}{1.75 }\)

v = 6.79 m/s

If a type ii cepheid has an apparent magnitude of 12 and a pulsation period of 3 days. the  approximate distance to this cepheid variable star is 0.14 parsecs.

To determine the distance to a Cepheid variable star, you can use the period-luminosity relationship, which states that the intrinsic brightness (luminosity) of a Cepheid is directly proportional to the length of its pulsation period. In other words, the longer the period, the brighter the Cepheid.

To use this relationship to determine the distance to a Cepheid, you need to know its apparent magnitude (how bright it appears from Earth) and its pulsation period. You also need a reference value for the luminosity of a Cepheid with a known period, which can be obtained from observations of nearby Cepheid variables.

Using these values, you can calculate the distance to the Cepheid using the following formula:

distance = 10 ^ ((reference luminosity - apparent magnitude + 5) / 5)

Plugging in the values you provided, we get:

Distance = 10 ^ ((-2.5 - 12 + 5) / 5)

= 10 ^ (-9.5 / 5)

= 10 ^ (-1.9)

= 0.14 parsecs

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Answer:

the energy in the oscillations between the blocks is 3.025 J

Explanation:

Given the data in the question;

Force f = 138 N

stiffness of spring k = 605 kg/s²

mass of block = 202 g = 0.202 kg

pushing the block a distance 15 cm, the rightmost block has moved a distance 5 cm

i.e

x₁ = 15 cm

x₂ = 5cm

the energy in the oscillations between the blocks will be;

E\(_A\) = E\(_B\) = \(\frac{1}{2}\)k( Δx )²

we substitute

= \(\frac{1}{2}\) × k( 15 - 5 )² × 10⁻⁴

= \(\frac{1}{2}\) × 605 × ( 10 )² × 10⁻⁴

= \(\frac{1}{2}\) × 605 × 100 × 10⁻⁴

= 3.025 J

Therefore, the energy in the oscillations between the blocks is 3.025 J

Answer:

Explanation:

Decision making is the process of making choices and it is important for a person to make their own decisions in life as it makes them accountable for the choices they made.

What is decision making?

Decision making is the process of making your own choices by identifying a decision, gathering the information, and assessing alternative resolutions for the decision.

Each person has the right to make their own decisions and have choices about how they live their life in their own way. Each person has different ideas about what is important and what makes them feel best in life. Making own choices about things in life is very important because it gives the life meaning.

Being responsible in making own decisions means being accountable, taking charge of the course of the actions and the consequences of choices, however it is also important to turn to others in cases of making decisions about health as this helps in making the best decision by understanding things from other perspectives.

The amount the needle on the meter is deflected A. increases

This phenomenon can be explained by Faraday's law of electromagnetic induction. According to this law, when a magnetic field (created by the bar magnet) passes through a coil of wire, it induces an electric current in the wire. This induced current generates its own magnetic field, which interacts with the magnetic field of the bar magnet.

The deflection of the meter needle is a result of this induced current. When the number of coils of wire is increased, there is a greater number of wire loops for the magnetic field to pass through. This leads to a stronger induction of electric current, resulting in a larger deflection of the meter needle.

By increasing the number of coils, more magnetic flux is linked with the wire, resulting in a higher induced electromotive force (emf) and a greater current. This increased current produces a stronger magnetic field around the wire, leading to a larger deflection on the meter. Therefore, increasing the number of coils of wire enhances the magnetic field interaction, resulting in an increased deflection of the meter needle. Therefore, Option A is correct.

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Answer:

Start of the motion: 2 seconds

End on the motion: 1 second

Explanation:

The force acting on a body in free fall is the gravitational force

The approximate time at which the upward speed of the ball will be 20 m/s is 1.942 second

The approximate time at which the upward speed of the ball will be 30 m/s is 0.923 second

Question: Please find attached the required speedometer readings that can be used to complete the question

Reasons:

Known parameter;

The direction in which the ball is launched = Straight upward

The speedometer reading after 5 seconds  = 10 m/s moving downward

Required:

The time at which the ball will be moving upwards with a velocity of 20 m/s, and 30 m/s

Solution:

Taking upwards as positive, the formula for velocity is given as follows;

v = u - g·t

Where;

v = The speed of the ball = -10 m/s (downward is negative)

g = Acceleration due to gravity ≈ 9.81 m/s²

u = The initial speed of the ball

-10 = u - 9.81 × 5

∴ u = -10 + 9.81 × 5 = 39.05

The initial upward speed of the ball at the time of launch, u = 39.05 m/s

The time at which the upward speed of the ball will be 20 m/s, we have;

v = 20 = u - g·t

∴ 20 = 39.05 - 9.81×t

\(t = \dfrac{20 - 39.05}{-9.81} =1\frac{308}{327} \approx 1.942\)

The time at which the ball will be moving upwards at a speed of 20 m/s is t ≈ 1.942 s

Upward speed of 30 m/s

When the ball is moving upwards with a speed of 30 m/s, we have;

30 = 39.05 - 9.81 × t

\(t = \dfrac{30 - 39.05}{-9.81} = \dfrac{905}{981} \approx 0.923\)

The time at which the ball will be moving upwards at a speed of 30 m/s is t ≈ 0.923 s

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Answer:

just go to demos:) yere yerre

5.32m/s must be  the constant speed of the second swimmer in order to catch up to the leader at the end of the pool.

The equation for distance for a constant velocity is given by:

x = v * t, x = distance, v = velocity, t = time

1. The time for the first swimmer to reach the end of the pool:

t₁ = x/v₁

= 41m / 5.0m/s

=8.2s

2. The second swimmer will be at the same location at a time t₂, from where she has 0.50s less to reach the end of the pool than the first swimmer. The velocity for the other swimmer will be:

v₂ = x/t₂

= 41 / (t₁ - 0.50s) =  41m / 7.7s

=5.32m/s

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1.Unit vector in the direction BA: BA/|BA| = (2/3, 2/3, 1/3)

2.The angular velocity (ω) of the body is given as 3 radians per second.

3.Without the position of point P given, it is not possible to write the position vector of P.

4.Left-handed rotation refers to the direction of rotation where the rotation follows the left-hand rule.

5.Position vector of point A: (4, 1, 1)

Position vector of point B: (2, -1, 0)

The direction vector BA = (-2, -2, -1)

1.To determine the unit vector pointing in the direction BA, we subtract the coordinates of point B from the coordinates of point A and normalize the resulting vector.

The direction vector BA is given by:

BA = (4 - 2, 1 - (-1), 1 - 0) = (2, 2, 1)

To obtain the unit vector in the direction of BA, we divide the direction vector by its magnitude:

|BA| = √(2^2 + 2^2 + 1^2) = √(4 + 4 + 1) = √9 = 3

Unit vector in the direction BA: BA/|BA| = (2/3, 2/3, 1/3)

2.The angular velocity (ω) of the body is given as 3 radians per second.

3.Without the position of point P given, it is not possible to write the position vector of P. Please provide the position of point P to proceed with the calculation.

4.Left-handed rotation refers to the direction of rotation where the rotation follows the left-hand rule. In a left-handed coordinate system, if you curl the fingers of your left hand in the direction of rotation, your thumb will point in the direction of the rotation axis. It is the opposite direction to a right-handed rotation.

5.The position vectors of points A and B are:

Position vector of point A: (4, 1, 1)

Position vector of point B: (2, -1, 0)

The direction vector BA can be obtained by subtracting the coordinates of point A from the coordinates of point B:

BA = (2 - 4, -1 - 1, 0 - 1) = (-2, -2, -1)

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The quantity of heat energy that must be transferred to 2.25 kg of brass to raise its temperature from 20 °C to 240 °C is 195030 J

First, we shall list out the given parameters from the question. This is shown below:

The quantity of heat energy that must be transferred can be obtained as follow:

Q = MCΔT

= 2.25 × 394 × 220

= 195030 J

Thus, we can conclude quantity of heat energy that must be transferred is 195030 J

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Answer:

w=fx

w=(15)(5)

w=75

the angle between the deplacement and N is 0

Answer: Hope this helps ;) don't forget to rate this answer !

Explanation:

There are two correct answers:

A) A corporation leader makes direct payment to the candidate.

D) A corporation contributes to a Super PAC that a PAC accepts contributions for a candidate.

Option A describes a scenario where a corporation directly donates money to a presidential candidate, which is allowed as long as it is done within the limits set by campaign finance laws.

Option D describes a scenario where a corporation donates money to a Super PAC, which is a type of political action committee that can accept unlimited donations from individuals, corporations, and other organizations. The Super PAC can then use the money to support or oppose a particular candidate, but it is not allowed to coordinate directly with the candidate or the candidate's campaign.

I hope this helps! Let me know if you have any other questions.