in an experiment, block is given an initial speed toward block , which is initially at rest. the blocks are on a track that has a motion detector set up, as shown above. when the two blocks collide, there is a completely inelastic collision and the blocks move together with speed . the blocks were both placed on a balance, and it is determined that they have the same mass. the experiment is repeated for four different initial speeds, and the data are shown in the chart below. it appears that the resulting data are not accurate. which measurement most likely produced errors in the data seen in the chart below?

When a skydiver pulls the parachute cord, it causes: the air resistance force to become greater than the weight force.

This means that the skydiver will experience a sudden deceleration as the parachute opens up and increases the air resistance acting on the body. As a result, the skydiver will slow down and gradually come to a stop.

The terminal velocity, which is the maximum speed that the skydiver can achieve while falling, is reached due to a balance between the weight force and air resistance force. When the parachute is deployed, it significantly increases the air resistance force acting on the skydiver, and as a result, the skydiver's speed decreases rapidly.

The parachute slows down the skydiver to a safe landing speed and prevents them from hitting the ground with a deadly impact. Therefore, deploying a parachute is a crucial step in ensuring the safety of a skydiver during the landing process.

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Hi there!

We can begin solving for the work necessary using the following:

\(W = \Delta U = mg\Delta h\)

W = Work (J)

Δh = change in height (10 m)
m = mass (75 kg)
g = acceleration due to gravity (9.8 m/s²)

Plug in the givens:

\(W = 75 \cdot 9.8 \cdot 10 = 7350 J\)

Now, we can solve for power with this equation:
\(\large\boxed{P = \frac{W}{t}}\)

P = Power (Watts)

W = Work (J)
t = time (s)

Plug in the values:

\(P = \frac{7350}{25} = \boxed{294 W}\)

Answer:

D

Explanation:

Change in speed or direction is acceleration

An object accelerates when it is moving faster. Option A is corect.

The rate of velocity change concerning time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.

The pace at which a body's velocity varies is represented by acceleration, which is a vector quantity.

\(\rm a = \frac{v-u}{t}\)

Where,

u is the initial speed in m/sec

v is the final speed in m/sec

t is the time interval in sec

a is the acceleration in m/sec²

When an object is accelerating it speeds up.

Hence option A is correct.

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When acceleration is constant and the initial velocity is zero, displacement varies with time as a parabolic function, increasing at an increasing rate.

When acceleration is constant and the initial velocity is zero, displacement (d) varies with time (t) according to the equation d = 1/2at^2, where a is the acceleration. This equation can be derived from the relationship between velocity, acceleration, and displacement, which is given by the equation v^2 = u^2 + 2as, where u is the initial velocity.

Since the initial velocity is zero, the equation can be simplified to v^2 = 2as, where s is the displacement. By integrating both sides of the equation with respect to time, we get v = at, and by integrating again with respect to time, we get s = 1/2at^2.

Therefore, when acceleration is constant and the initial velocity is zero, displacement varies with time as a parabolic function, increasing at an increasing rate. The rate of increase of displacement depends on the magnitude of the acceleration. The greater the acceleration, the greater the rate of increase of displacement. The displacement at any time can be calculated by substituting the time into the equation d = 1/2at^2.

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The point in the compass needle has the opposite polarity from Earth’s north pole. The correct option is B.

The compass needle A magnetized pointer within a compass that can freely align with the Earth's magnetic field.

The magnetic needle is the most important part of the compass. It swings around the compass as you move, but the red end always points north and the white (or sometimes black) end always points south.

If you mean the geographical North Pole, the needle would point south because that is the only way to get there; more specifically, it would point south along the 112.4 degrees west longitude meridian towards the magnetic north pole at 82 degrees north, where compasses point.

Thus, the correct option is B.

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Doubling the kinetic energy of a car does not change its momentum. Momentum is determined solely by the mass and velocity of the object, independent of its kinetic energy.

Kinetic energy and momentum are two different physical quantities that describe the motion of an object. Kinetic energy depends on the mass and velocity of an object, while momentum depends only on the mass and velocity.

When the kinetic energy of a car is doubled, it means that the car's velocity is increased while its mass remains the same. However, momentum is the product of mass and velocity, so if the mass remains constant, any change in kinetic energy does not directly affect momentum.

Mathematically, the formula for kinetic energy is KE = (1/2)mv^2, where KE represents kinetic energy, m represents mass, and v represents velocity. On the other hand, momentum is given by the formula p = mv, where p represents momentum. As we can see, kinetic energy involves velocity squared, while momentum only involves velocity.

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A)kinetic energy, because it is in motion

 Question

The picture of a coaster shows?

Answer

The answer is (A) beacuse kinetic energy is a form of energy that an object or particle has by reason of its motion.

Hence, all that Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.

THEREFORE THE ANSWER IS (A). -_-

If the distance between two objects is 4.00 m and the distance is tripled, then the new distance will be 12.00 m.

To find out the new distance, you need to multiply the original distance by the factor by which it is tripled, which is 3.In other words, if the distance between two objects is "d", and it is tripled, then the new distance is 3d.

Using this formula, if the original distance is 4.00 m, then the new distance will be 3 x 4.00 m = 12.00 m.

The new distance is three times the original distance.

Therefore, the new distance between the two objects will be 12.00 meters if the original distance was 4.00 meters and it was tripled.

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An electric fan is turned off, and its angular speed decreases uniformly from 720 rev/min to 200 rev/min in a time interval of period 3.25.

In mechanics, acceleration is the price of trade of the rate of an item with recognition to time. Accelerations are vector quantities. The orientation of an item's acceleration is given by means of the orientation of the internet force performing on that item.

According to Newton's second regulation of movement, the acceleration of an object equals the internet force performing on it divided via its mass, or a = F m . This equation for acceleration can be used to calculate the acceleration of an object while its mass and the internet force appearing on it are regarded.

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Answer:

The acceleration of the tennis racket is \(23.52\ m/s^2\).

Explanation:

Mass of tennis racket is 0.34 kg

Mass of a tennis ball is 0.064 kg

The force acting by the tennis racket by the tennis ball is 8 N. It is required to find the how fast would the tennis racket accelerate initially. Force is given by :

F = ma

\(a=\dfrac{F}{m}\\\\a=\dfrac{8}{0.34}\\\\a=23.52\ m/s^2\)

So, the acceleration of the tennis racket is \(23.52\ m/s^2\).

16.77m is the lemming's change in height when it reaches the water.

A thing is said to be in projectile motion when it has been fired into the air. After the initial force that launches the object, it only experiences the force of gravity. It is what it is—a projectile—and the path it took to get there is what it was.

You can tell from the situation that this projectile is a Type 1 projectile, or a horizontal projectile. Before you can resolve this issue, you will need a few things.

You must first examine the information you were given:

Vix = 2.87 m/s

dx = 5.32m

Your height or vertical distance are what you need. The following is the usual formula for projectile displacement:

d = Vit +1/2gt²

Specifically, you only need to enter the y-components to obtain the vertical distance. Now keep in mind that a horizontal projectile initially moves only forward and not vertically. Your vi = om/s, leaving you with the following equation:

dy = Viyt + 1/2 gt²

dy = (0m/s)t + 1/2 gt²

dy = 1/2 gt²

However, if you examine your issue, you will discover that no time has been allotted. You can resolve it using the information provided by deriving it from the x component formula:

dx = Vixt

Plug in your knowledge and find a solution for your ignorance.

dx = Vixt

5.32m = (2.87m/s)t

5.32/2.87= t

t = 1.85s

You can solve for your vertical distance/displacement now that you know the time:

dy = 1/2 gt²

dy = 1/2 (9.8 × 1.85²)

dy = 16.77m.

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Answer:

the answer is -16.8

Explanation:

it’s negative because your going down and you have to round off to match the significant digits.

The MOST likely that makes this study difficult to conduct accurately is the fact that researchers might interpret the subjects’ movements differently. Accuracy is fundamental in experimentation.

Accuracy in an experiment refers to how close the final result of an experimental procedure is to a value considered as correct or accepted.

For example, accuracy can be how close is a given measurement in an experimental procedure.

Accuracy can be affected by human error (e.g., different persons can exhibit different methodologies to obtain a measurement).

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Answer:

Researchers might interpret the subjects' movements differently.

Explanation:

No, Charles Darwin did not use a chronometer. He used a sextant and other navigational instruments to measure his position while sailing on HMS Beagle.

Charles Darwin was a scientist and naturalist who made significant contributions to our understanding of evolution and the natural world. He is best known for his voyage on HMS Beagle from 1831 to 1836, during which he made observations and collected specimens from around the world. While on the Beagle, Darwin used a variety of navigational instruments to measure his position and observe the stars.

The most important tool that Darwin used was a sextant. This instrument was used to measure angles between two celestial objects, such as the position of the sun or stars. Using this data, navigators could calculate their position on Earth. Darwin also used a chronometer, which is a clock that is accurate even when subjected to the motion of a ship. This allowed him to maintain accurate time and calculate longitude.

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Answer:

0.0000076 grams

Explanation:

We're given the half life of Tritium to be 12.3 years. In order to find out the amount of substabce remaining:

Let's first find how many 'half lives' are in 250 years.

\(n = \frac{250}{12.3} = 20.325\)

Now what is half life? It means the time taken for a given quantity of an element to lose half it's mass.

So in 12.3 years we can find that The amount of 250 g of Tritium will be 250/2 = 125 g. In 24.6 years we'll have 125/2 = 62.5 g

So now we can devise a formula:

\(m = \frac{original \: amount}{ {2}^{n} } \)

Where m is the remaining amount and n is th number of half lives in the time given.

Using this formula we can calculate:

\(m = \frac{10}{ {2}^{20.325} } \)

Doing this calculation we get:

\(m = 0.0000076 \: g\)

As we can see a very small value remains.

Answer:

4.0 m/s ^2

Explanation:

The acceleration of the block weighing 80 n attached to a spring scale, and both are pulled to the right on a horizontal surface with negligible friction between the block and the surface will be 4 m/s² when it reads 32 n.

Acceleration is physical quantity used to express the rate of change in velocity of a moving massive body. Acceleration of an object is directly proportional to the force acting and inversely proportional to the mass.

The equation relating force and acceleration is F = ma. Thus as the mass of the body increases, acceleration decreases and this is called deceleration.

Given that the weight of the body is 80 n. It is the product of mass and gravity of 10 m/s². Thus mass m = 80/10 = 8 kg.

The scale reads a force of 32 Newton for the body weighing 8 Kg. Hence the acceleration can be calculated as follows:

a = F/m

   = 32 N/ 8 Kg

   = 4 m/s².

Therefore, when the acceleration of the body of 8 kg when the scale reading is 32 N is 4 m/s².

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Explanation:

The vertical velocity changes because gravity is what brings the ball downwards, since gravity is what cause acclereation in free fall, acclereatiin will make the velocity become more negative.

There is no force happening on the ball in the horinzontal direction so according to Newton 1st law, the ball will remain in constant velocity n the horinzotnal direction.

When a weightless spring scale is attached to two equal weights, the reading on the scale will be zero. This is because the weights on both sides are balanced, resulting in no net force acting on the scale.

The reason for this is Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In this case, when one weight exerts a downward force on the spring scale, the other weight exerts an upward force of the same magnitude on the scale.

These opposing forces cancel each other out, resulting in a net force of zero. As a result, the spring scale does not experience any deformation and the reading remains at zero.

It is important to note that this only applies when the two weights are equal. If the weights were different, there would be an imbalance in the forces, causing the spring scale to register a non-zero reading.

In summary, when a weightless spring scale is attached to two equal weights, the reading on the scale will be zero due to the balanced forces acting on it.

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With "toward the wall" designated as the positive direction, the average acceleration felt the ball in the 0.0158 s of contact with the wall is

\(a_{\rm ave} = \dfrac{-26.412\frac{\rm m}{\rm s} - 28.4\frac{\rm m}{\rm s}}{0.0158\,\mathrm s} ≈ \boxed{-3470 \dfrac{\rm m}{\mathrm s^2}}\)

The largest possible distance between speaker B and the observer at C is 1.37 m.

The largest possible distance between speaker B and the observer at C occurs when the difference in travel distances is just one half wavelength.

λ = v/f

λ = (343)/125

λ = 2.744

¹/₂λ = ¹/₂(2.744) = 1.37 m

Thus, the largest possible distance between speaker B and the observer at C is 1.37 m.

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When they were falling, their acceleration is equal to the gravity acceleration.

When they started stopping, the time required to stop is 1.5 seconds, that is, 3 times less than the time accelerating.

Since the change in velocity when falling and when stopping is the same (same magnitude but opposite signal), the acceleration when stopping will be 3 times more than the acceleration when falling (because the change in velocity is the same and the time is 3 times less).

So we have:

Therefore the acceleration is 29.4 m/s².

Answer:

Explanation:

Given:

U =12 V

E = 60 J

________

q - ?

E = U·I·t

q = I·t

E = U·q

q = E / U = 60 / 12 = 5 С

The complete question is

A 45-kg child sits on a 3.2-kg tire swing. The tension on the rope is 470 N. The tree branch sags and the child's feet rest on the ground. If the tension in the rope is reduced to 220 N, what is the value of the normal force being exerted on the child's feet?

Answer:

Therefore the Normal force is being exerted on the child's feet is 252.36( 250N).

Explanation:

We are given

mass of child = 45kg

mass of the tire = 3.2kg

g = 9.8 m/s^2

We have the first case in which the tire is in swing so tension in that case will be which is the resultant force.

Fr = Resultant force

Ft =  Tension force

Fg= Gravitational force

Fr = Fg + Ft

0 = -mg + Ft

Ft = mg

   = (45+3.2)*9.8

   = 48.2 * 9.8

Ft = 472.36N  ( which is close to 470)

In the second case the child is in the rest position, The resultant force will be zero.

Fr = Ft + Fn + Fg  ( Normal force is denoted by Fn )

0 = Ft + Fn + Fg

Fn =  -Fg -Ft

Fn = mg -Ft

    = 472.36 - 220

Fn  = 252.36N  ( close to 250N)

Therefore the Normal force being exerted on the child's feet will be 252.36N.  

Inability of Wegener to provide adequate explanation of the forces responsible for continental drift and prevailing belief that the earth was solid and immovable resulted in scientific dismissal of his theories.

The primary reason that Wegener's hypothesis could not be accepted was because he suggested no mechanism for the moving of continents. He thought that the force of Earth's spin was sufficient enough to cause continents to move, but geologists knew that rocks are too strong for this to be true.

Wegener is not qualified to propose theories in the fields of geology and  history of Earth because there was no mechanism available to endorse his proposals and offer convincing and truthful explanation.

The fossils could naturally be located in the places Wegener found them because fossils are mostly found where sedimentary rocks of the right age are exposed, such as river valleys, cliffs and hillsides.

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To determine the reject rate (RR) for each scenario, we need to consider the capability indices Cp and Cpk along with the specifications for tensile strength. The reject rate represents the proportion of parts that do not meet the specifications.

1. RR = 0.27%

2. RR = 16.03%

3. RR = 0%

4. RR = 0.003%

5. RR = 0.27%

6. RR = 2.28%

7. RR = 29.93%

8. RR = 0%

9. RR = 5.87%

Please note that these calculations assume a normal distribution of tensile strength and that the process is in statistical control. The reject rate is obtained by evaluating the proportion of values falling outside the specified limits based on the process capability indices Cp and Cpk.

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Answer:

90N

Explanation:

The total resultant force acting on the desk being pushed by Sara and Carlo is 90N

A resultant force is a singular force that will act the same effect as the forces acting on a body.

So;

  Resultant force = Force applied by Sara + Force applied by Carlo

  Resultant force  = 50N + 40N  = 90N

Answer:

Neap tide, which also occour twice a month. It happens when sun and moon are right angle to each other.

Explanation:

In both cases, the gravitational pull of the sun is “added”to the gravational pull of the moon on the Earth.

If a body is in equilibrium, it must satisfy all three laws of equilibrium. The statement is True.

The three laws of equilibrium are:

The algebraic sum of all the forces acting on a body must be zero.

The algebraic sum of all the moments acting on a body must be zero.

The body must be at rest or moving with constant velocity.

If a body is in equilibrium, it must satisfy all three laws. If it does not satisfy all three laws, then it is not in equilibrium.

For example, if a body is at rest and the algebraic sum of all the forces acting on it is not zero, then it is not in equilibrium. This could be because the body is being acted on by a net force, or because the forces are not balanced.

Similarly, if a body is moving with constant velocity and the algebraic sum of all the moments acting on it is not zero, then it is not in equilibrium. This could be because the body is being acted on by a net torque, or because the moments are not balanced.

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The speed of the beach ball after the collision is approximately 1.2 m/s in the opposite direction of its initial velocity.

After the collision, the momentum of the system is conserved, so the momentum of the beach ball and the exercise ball must be equal and opposite. Using the equation:

\(m_1v_1 + m_2v_2 = m_1v_1' + m_2v_2'\)

where\(m_1\)and \(m_2\) are the masses of the beach ball and exercise ball, \(v_1\) and \(v_2\) are their initial velocities, and v1' and \(v_2'\) are their final velocities.

Assuming the beach ball is much lighter than the exercise ball, we can neglect the mass of the beach ball compared to the exercise ball and simplify the equation to:

\(m_1v_1 = m_2v_2\)

where v2' is the final velocity of the exercise ball after the collision.

Since the collision is elastic, the coefficient of restitution (e) is equal to the ratio of the relative velocities of the two balls after the collision to their relative velocities before the collision. In this case, the exercise ball is at rest before the collision, so the coefficient of restitution is equal to the ratio of the final velocity of the beach ball to its initial velocity:

\(e = v_1' / v_1\)

Using the conservation of momentum equation and the equation for the coefficient of restitution, we can solve for v1' to get:

\(v_1' = (m_1 - e * m_2) / (m_1 + m_2) * v_1\)

Plugging in the values given in the problem, we get:

\(v_1'\) = (1 - 1 * 3) / (1 + 3) * 6.0 m/s

\(v_1'\) = -1.2 m/s (Note that the negative sign indicates that the beach ball is moving in the opposite direction after the collision)

Therefore, the speed of the beach ball after the collision is approximately 1.2 m/s in the opposite direction of its initial velocity.

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