An object of unknown mass is swung in a vertical circle at the end of a light string, as seen in the figure above. A measurement is made of the object’s tangential speed at the bottom circular path. A student must determine the tension in the string at the bottom of the circular path. Which of the following measurements, in conjunction with the object’s tangential speed, are required to determine the tension in the string? select two answers.

Answer:

¿Podrías poner la pregunta en inglés por favor?

Explanation:

Answer:

Geologists use seismic waves to locate the center of an earthquake.

Explanation:

Answer: they collect data from seismographs

Explanation: on the quiz on edge 2020, it’s correct

Answer:

H = 234.85m

Explanation:

Using the formula for calculating range to find the maximum height

Range R = U√2H/g

U is the speed = 13m/s

H is the max height

R is the distance covered in horizontal direction

g is the acceleration

Substitute the given values as shown;

90 = 13√2H/9.8

90/13 = √2H/9.8

6.923 = √2H/9.8

6.923² = 2H/9.8

2H = 6.923²  *  9.8

2H = 469.70

H = 469.70/2

H = 234.85m

Hence the top level was 234.85m high

The input voltage of a transformer must be AC (alternating current) because transformers rely on the property of AC for effective electromagnetic induction, which is essential for their operation.

Electromagnetic induction occurs when a varying magnetic field induces an electric voltage in a conductor. In the case of a transformer, an alternating current passing through the primary coil generates a changing magnetic field, which, in turn, induces a voltage in the secondary coil.

AC is particularly well-suited for this process due to its constant change in direction, resulting in a continuously fluctuating magnetic field. This dynamic magnetic field induces a voltage in the secondary coil, facilitating efficient energy transfer from the primary coil to the secondary coil.

Conversely, if a transformer were to be powered by DC (direct current), the magnetic field produced by the unidirectional current would remain constant. As a result, there would be no continuous alteration in the magnetic field to induce a voltage in the secondary coil, severely limiting the transformer's functionality.

Hence, the utilization of AC input voltage is critical for transformers as it enables efficient energy transfer and voltage transformation between various circuits or power systems.

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Answer:

When unbalanced forces act on an object at rest, the object will move. ... Second, when unbalanced forces act on a moving object, the velocity of the object will change. Remember that a change in velocity means a change in speed, direction or both speed and direction.........Eg.If you kick a football and it moves from one place to another, it means that unbalanced forces are acting upon it. Ball moves from one place to another after kicking it.

Answer:

unbalanced forces could change speed,direction

Explanation:

Example

if two people are pulling a rope and the other one is stronger the rope moves toward the stronger one cause the force is unbalanced

calculating the area under the graph by dividing it

into a triangles and rectangles

A2 = 0.5 × h × b

= 0.5 × 10 × 5 = 25

A1 = 0.5 × 10 × 15 = 75

A4 = 0.5 × 15 × 10 = 75

A4 = h × b = 10 × 35 = 350

total displacement = 25 + 75 + 75 + 350 = 525

Answer:

Na+ca+CO=NACo^3

Explanation:

NA Burns violently with explosions that may spatter the material. Used for making gasoline additives, electric power cable, sodium lamps, other chemicals.

Answer:

54.4311 kilogram

Explanation:

The plane's speed is 450 miles per hour, and the wind speed is 50 miles per hour. This is determined by solving the equations derived from the distances and times of the flight with and against the wind.

Let's assume the speed of the plane (without considering the wind) is P, and the speed of the wind is W.

When flying into a headwind, the effective speed of the plane is reduced by the wind speed. So the equation for the outbound flight is:

P - W = 2000 miles / 5 hours

P - W = 400 miles per hour (mph)  ---(Equation 1)

When flying with a tailwind, the effective speed of the plane is increased by the wind speed. So the equation for the return flight is:

P + W = 2000 miles / 4 hours

P + W = 500 miles per hour (mph)  ---(Equation 2)

Now we have a system of two equations (Equation 1 and Equation 2) with two variables (P and W). We can solve this system to find the values of P and W.

Adding Equation 1 and Equation 2 together, we eliminate the variable W:

(P - W) + (P + W) = 400 mph + 500 mph

2P = 900 mph

P = 450 mph

Substituting the value of P back into Equation 1 or Equation 2, we can solve for W:

450 mph - W = 400 mph

W = 450 mph - 400 mph

W = 50 mph

Therefore, the plane's speed is 450 mph and the wind speed is 50 mph.

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Answer:

E. An object’s velocity changes at a constant rate, and its acceleration remains constant.

Explanation:

When an object is in freefall, it implies that the object is falling freely under gravity. If it falls towards the earth surface, the fall is in the direction of the Earth's gravitational force.

At the point of release of the object, its initial velocity is zero because it is at rest. But when released, its velocity increases at a constant rate until it is acted upon by an external force. But its acceleration remains constant, acceleration due to gravity.

Answer:

I'm pretty sure it should be 4KClO3-->3KClO4+1KCl

Explanation:

Answer:

I think the second one

Explanation:

its the only one that makes since tell me if I'm wrong

Answer:

the answer is "The atmosphere is so thin that gas molecules rarely contact each other."

Explanation: just took the semester test  

Answer:

where is the question? I can only see the diagram

d) is an atom of Sodium and an atom of Chlorine.

e) is a molecule of water.

Answer:

Amontons's law. If the temperature is increased, the average speed and kinetic energy of the gas molecules increase. ... If the gas volume is decreased, the container wall area decreases and the molecule-wall collision frequency increases, both of which increase the pressure exerted by the gas

The time taken by a truck to fully stop will be 2 hours. The time taken is found with the help of Newtons second equation of motion.

Distance is a numerical representation of the distance between two objects or locations.

Distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.

The given data Is;

u is the velocity of truck =  55 mph

v is the final velocity of truck = 0 mph

S is the distance travelled by the truck before stop= 302 feet

1 feet = 0.000189394 mile

302 feet = 302 × 0.000189394 mile= 0.057197 mile

From the Newtons's second equation of motion;

\(\rm v^2 = u^2-2as\)

The formula for the acceleration is found as;.

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

By rearranging the equation, we get;

\(\rm u^2 =2as \\\\ u^2 =2[ \frac{v-u}{t}]s \\\\ u = \sqrt{2[ \frac{v-u}{t}]s} \\\\ 55 = \sqrt{2[ \frac{55-0}{t}]} \\\\ 55= \frac{2 \times 55}{t} \\\\ t= 2 \ hour\)

Hence, the time taken by a truck to fully stop will be 2 hours.

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The period of the rotation of two stars in a binary system can be calculated using Kepler's third law, which states that the square of the period of the orbit is proportional to the cube of the average distance between the stars.

Mathematically, T^2 = (4π^2/G)(a^3/(ma+mb)), where T is the period of rotation, G is the gravitational constant, a is the distance between the stars, and ma and mb are the masses of the stars. Solving for T, we get T = 2π(sqrt(a^3/(G(ma+mb)))). Therefore, given the masses of the stars and the distance between them, we can calculate the period of their rotation using this formula.

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The final speed of object A will be twice the final speed of object B since both objects have the same acceleration, but object A accelerates for a longer duration.

Since objects A and B start at rest and accelerate at the same rate, the end speed is simply proportional to acceleration duration.

Let B accelerate for "t" units. Object A accelerates for "2t" units.

The final speed of an item can be calculated using the equations of motion: v = u + at, where "v" is the final velocity, "u" is the initial velocity (zero in this case), "a" is the acceleration, and "t" is the acceleration time.

A and B have identical accelerations. Thus, object A's final velocity, vA, is 2at = (0) + a(2t).

Object B's final velocity, vB, is (0) + a(t) = at.

The final speed of item A (2at) is twice that of object B (at). Thus, A's final speed is twice B's.

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Answer:

conserved quantity

created or destroyed

Answer:

You can use this to figure out the answer! Or you may use this:
Energy is always consweved quantity, meaning that energy cannot be created or destroyed.

Explanation:

Energy is the capacity for doing work. It may exist in potential, kinetic, thermal, helectrical, chemical, nuclear, or other forms.

When a bead is sliding along a wire that is bent into a circular shape and rotating about its vertical axis, it experiences a radial acceleration towards the axis of rotation. At a certain point along the wire, the bead will be in vertical equilibrium, meaning that it experiences no net force in the vertical direction.

This occurs when the gravitational force acting on the bead is balanced by the centrifugal force resulting from the circular motion of the wire. The centrifugal force is directed radially outwards from the axis of rotation and is proportional to the square of the angular velocity of the wire.

At the point of vertical equilibrium, the magnitude of the centrifugal force is equal to the magnitude of the gravitational force acting on the bead. This allows the bead to remain in a stable position on the wire, without moving up or down.

Therefore, the point of vertical equilibrium can be determined by balancing the gravitational force and the centrifugal force acting on the bead, which occurs at a specific distance from the axis of rotation and at a specific angular velocity of the wire.

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Answer:

microwave because it will heat it very well

Answer:

Veterbrate

Explanation:

In our solar system, distances are really great. Therefore, astronomers frequently avoid using miles or kilometers when describing the distances to planets, asteroids, comets, or spacecraft.

They substitute astronomical units, or AU, which represent the typical separation of the Earth from the sun. That translates to around 93 million miles, 150 million kilometers, or 8 light-minutes.

It is simpler to visualize relative distances in space when thinking in terms of astronomical units.  An astronomical unit is 92,955,807 miles in exact distance (149,597,871 km).

The orbit of the Earth around the sun is not a complete circle. Consequently, during the year, Earth's distance from the sun varies. Earth is approximately 0.983 AU from the sun when it is at perihelion, which occurs in January.

Therefore, In our solar system, distances are really great. Therefore, astronomers frequently avoid using miles or kilometers when describing the distances to planets, asteroids, comets, or spacecraft.

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The statements that best describe solstices include:

A. They occur when the Sun reaches its highest or lowest point in the sky.

B. They affect the amount of sunlight in the Northern Hemisphere in June.

D. They influence the cycling of different seasons based on the Sun's height in the sky.

A solstice can be defined as a phenomenon in which the Sun reaches its maximum or minimum declination relative to the celestial equator on the celestial sphere, thereby, producing either the least amount of daylight time within a day or the most amount of daylight time. Also, it occurs twice in a year between June 20-22 and December 21-23.

Traditionally, solstice marks the beginning (start) of seasons such as summer and winter depending on the hemisphere.

Hence, the statements that best describe solstices include:

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The magnitude of the electric field is 1.20 x 10^7 N/C if the magnitude of the electric field if the string with a 7-gram ball carrying a charge of 4x10-9 C. Thus, option b is correct.

The given data is as follows:

Weight of ball = 7-gram

Charge of 4x10-9 C

Angle = 35 degrees

The electric field is described as the force per unit charge in a substance. The electric field  is calculated by using the formula,

E = mg / q * tan(θ)

g is the acceleration due to gravity.

E = (0.007 kg)(9.81 m/s^2) / (4x10^-9 C) * tan(35°)

E = 1.20 x 10^7 N/C

Therefore, the magnitude of the electric field is 1.20 x 10^7 N/C.

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Answer:

half or time for half the nuclei to decay.

Explanation:

If you look at courage and if you look at the brain, there is one particular brain structure that plays a very important role when it comes to courage and your own performance. This part of the brain is called the amygdala. The amygdala is a brain structure that is very small, and we have two of them, one of the left side of the brain, one on the right side of the brain. They’re very small and look like an almond. Amygdala is also the Latin word for almond. Even though they are small, they amygdala is also extremely powerful. It plays a very important role in our survival. Whenever there is a real danger outside, it will trigger a fight, flight or freeze response, so you will fight danger, run away, or just be blocked in your own emotions, you will freeze, perhaps you will hide. The amygdala is very important for our survival and for many emotions in general, but in many situations, the amygdala will also become active when there is no real danger, for example, standing on stage and holding a presentation, leading a difficult conversation. These are two examples where there’s no real danger, but nevertheless, the amygdala can be triggered and cause this feeling of nervousness and anxiety. It’s these feelings of nervousness, anxiety or insecurity that will also block us in our potential to hold a presentation or to lead a good conversation.

Answer:

I finish that module I'm sure it's D

(a) The acceleration of the masses is determined as 1.1 m/s² in the direction of the 5 kg mass.

(b) The tension in the string in terms of gravity is T = g.

(a) The acceleration of the masses is calculated by applying Newton's second law of motion.

F(net) = ma

where;

(5 kg x 9.8 m/s² ) - (1 kg + 3 kg )9.8 m/s² = ma

9.8 N = (5kg + 1 kg + 3 kg )a

9.8 = 9a

a = 9.8 / 9

a = 1.1 m/s² in the direction of the 5 kg mass.

(b) The tension in the string in terms of gravity is calculated as follows;

T = ( 5kg)g - (1 kg + 3 kg ) g

T = 5g - 4g

T = g

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