What's the energy before a student jumps off a bridge

Answer: Option (b) is the correct answer.

Explanation:

When we push the box, it will start to move as a result it will gain kinetic energy. As kinetic energy is the energy due to the motion of particles. Also there will be some friction force acting on the box.

Cohesion means the strength of holding particles together. When there is resistance in holding particles together then it is called cohesive friction.

Static friction is a force due to which an object retains at rest.

When a body is rolling on a surface then the force which resists its motion is known as rolling friction.

Thus, we can conclude that when you push a box across the floor, the box will experience a kinetic friction.

Answer:

Newton's 1st law explains this reaction

Explanation:

Newton's first law of motion, states that " a body at rest or uniform motion in a straight line, will continue in that state, unless acted upon by an external force.

The coffee in the cup, initially rest on the table, but the moment you bump the table, you act as an external force which distort the initial state of the coffee, making it to spill out.

Therefore, Newton's 1st law explains this reaction.

To find the magnitude of the acceleration in Atwood's machine system, set up equations for the forces on each block and solve them.

To determine the magnitude of the acceleration of the system, we can use Newton's second law and the concept of Atwood's machine. With Atwoods's machine, the magnitudes of acceleration of the two blocks are equal. We can set up two equations for the forces on each block and solve them to find the acceleration.

For block 1, we have T - mag = maa, where T is the tension in the string and ma is the mass of block 1.

For block 2, we have mbg - T = mba, where mb is the mass of block 2 and g is the acceleration due to gravity.

By substituting constants and solving these equations, we can find the magnitude of the acceleration.

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Flasks in a high school chemistry lab are primarily used for containing and mixing chemical solutions. Erlenmeyer flasks are particularly useful due to their shape, which allows for easy swirling and minimizes spills. Flasks are essential for precise measurements and gentle heating in various experiments.

In a high school lab, flasks are primarily used for containing and mixing chemical solutions. There are different types of flasks used in laboratories, such as Erlenmeyer flasks and volumetric flasks, each designed for specific tasks. Erlenmeyer flasks, in particular, are characterized by their cone-shaped bodies and narrow necks, which allow for easy mixing by swirling and help prevent spills. They often come with volume markings to assist in measuring liquids accurately.

Flasks are versatile and essential for various experiments. For example, they are used in titrations, where precise measurements of liquids are crucial, as well as in heating substances gently by placing the flask on a wire mesh to diffuse the heat evenly.

Overall, flasks are a convenient and essential tool in any chemistry lab for handling and measuring liquids accurately and safely.

We have that  the energy of a photon of the x-rays is

[tex]E=1.3*10^{-17}J[/tex]

From the Question we are told that

Wavelength [tex]l=15.0 nm[/tex]

Generally the equation for energy of a photon is mathematically given as

[tex]E=\frac{hc}{\lambda}[/tex]

Where

[tex]h= 6.626*10^-{34}\\\\c=3.00*10^7m.s[/tex]

Therefore

[tex]E=\frac{(6.626*10^-{34})(3.00*10^7)}{15*10^{-9}}[/tex]

[tex]E=1.3*10^{-17}J[/tex]

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To convert 3.8 km/sec to miles/year, multiply by the conversion factors: 3600 km/hour and 0.621 miles/km.

To convert 3.8 km/sec to miles/year, we need to first convert km/sec to km/hour, and then convert km/hour to miles/year.

1 km/sec is equal to 3600 km/hour (since there are 3600 seconds in an hour). So, 3.8 km/sec is equal to 3.8 x 3600 = 13,680 km/hour.

Now, to convert km/hour to miles/year, we can use the conversion factor of 0.621 miles/km. Therefore, 13,680 km/hour can be converted to miles/year by multiplying it by the conversion factor:

13,680 km/hour x 0.621 miles/km = 8,498.68 miles/year.

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Jean Piaget's cognitive development theory comprises four stages: sensorimotor, preoperational, concrete operational, and formal operational. Emotional Development, however, is not included in these stages. The correct option is D.

Jean Piaget, a notable cognitive development theorist, proposed a theory that cognitive development unfolds in four stages.

The stages are the sensorimotor stage (from birth until about 2 years old), the preoperational stage (approximately 2 to 7 years old), the concrete operational stage (about 7 to 11 years old), and the formal operational stage (from around 11 years old and beyond).

These stages represent children's ability to understand objects and how they work, their ability to use symbols to represent words, images, and ideas, their ability to think logically about real events, and ultimately, their development of abstract reasoning and hypothetical thinking.

Among the options provided, Emotional Development is not one of Piaget's stages of cognitive development.

Piaget's theory primarily centers on the evolution of logical thinking and reasoning abilities across different age groups, rather than emotional development.

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The probable question is :-

Which of the following is not one of Piaget's stages of cognitive development?

A) Sensorimotor

B) Preoperational

C) Concrete Operational

D) Emotional Development

A 70-watt bulb running on a 120-volt circuit uses approximately 0.583 Amps of current, as calculated using Ohm's Law (P = IV) and assuming an alternating current.

The amount of current used by a 70 watt light bulb running on a 120-volt circuit can be calculated using Ohm's Law, which states that power (P) equals voltage (V) times the current (I). In mathematical terms, P = IV. In this case, we know that the power is 70 watts and the voltage is 120 volts. So, we can use these values to solve for the current. Therefore, I = P/V = 70W/120V = 0.583 Amps.

Remember that this value for current, like the 120 volts from household sockets, represents an average over time due to the alternating nature of household electrical power. Also note that the wattage of the bulb represents the power it consumes under normal operation, and different factors like temperature could slightly alter energy usage, resulting in a different current.

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The hammer takes approximately 3.36 seconds to hit the ground from a height of 42m. With an initial upward velocity of 6m/s and the acceleration due to the Earth's gravity, the hammer hits the ground at a speed of approximately 39.1m/s.

The subject of this question is Physics, specifically dealing with the laws of motion and gravity. When the construction worker drops the hammer from an ascending elevator, the initial velocity of the hammer is the same as the speed of the elevator, which is 6m/s. However, as the hammer falls, it accelerates under gravity (taking 9.8m/s² as the acceleration due to gravity).

A. To find out how long it takes for the hammer to hit the ground, we need to solve for time (t) using the equation of motion: h = ut + 0.5gt², where h is the height (42m), u is the initial velocity (6m/s), and g is the acceleration due to gravity (9.8m/s²). Solving this equation yields a time of approximately 3.36 seconds.

B. To find out how fast the hammer is moving when it hits the ground, we use the equation v = u + gt, where v is the final velocity, u is the initial velocity (6m/s), g is the acceleration due to gravity (9.8m/s²), and t is the time taken which we calculated previously as 3.36 seconds. Solving the equation yields the speed as approximately 39.1m/s when the hammer hits the ground.

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Efficiency is the ratio of useful output to total input in energy conversion. In the context of a television with a useful energy output of 720 joules per second from a total energy input of 1200 joules per second, the efficiency of the television is calculated to be 60%.

The efficiency of a system, such as a television, can be calculated using the formula, Efficiency = (Useful Energy Output / Total Energy Input) x 100%. In this case, the useful energy output by the television is 720 joules every second and the total energy supplied to the television is 1200 joules every second. So, to calculate the efficiency you would do:

Therefore, the efficiency of the television is 60%.

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The correct answer is C. Solids have a definite shape and definite volume

Explanation:

There are four main forms or states in which matter can exist, this includes liquid, gas, solid and plasma and each of this varies according to shape, volume, and other features. In the case of solids, this occurs when particles in the matter are close to each other and remain statics, which creates a defined shape with a definite volume, different to liquids that have a definite volume but not a definite shape or to gases that vary in volume and shape. Considering this, the statement that best describes a solid is "Solids have a definite shape and definite volume".

Answer:

Object's momentum, p = 20 kg-m/s

Explanation:

It is given that,

Mass of the object, m = 4 kg

Velocity of the object, v = 5 m/s

We need to find the object's momentum. It is given by ;

p = m × v

[tex]p=4\ kg\times 5\ m/s[/tex]

p = 20 kg-m/s

So, the momentum of the object is 20 kg-m/s. Hence, this is the required solution.

The apparent force that seems to pull an object outward from the center of a curve is known as centrifugal force, which is actually the result of inertia in a rotating frame. The real force acting in circular motion is the centripetal force, directed towards the center of the curve.

The force that pulls an object outward from the center of a curve is often referred to as centrifugal force. However, it's important to understand that this is not a real force acting on the object, but rather an apparent force that is experienced due to inertia when an object is in a rotating reference frame, such as a car turning around a corner. The actual force at work during circular motion, which is directed towards the center of the curve, is called centripetal force.

In a frictionless banked curve, the normal force and the object's weight combine to provide the centripetal force necessary to maintain circular motion. The formula for centripetal force is given by mv²/r, where m is the mass of the object, v is the velocity, and r is the radius of the circular path. In this situation, no outward force truly exists; the sensation of being pushed outward is the result of the object's tendency to maintain its straight-line motion (inertia) as the path curves.

0.31 for E2020 users

Answer : Current flowing through the wire is 0.6 A

Explanation :

Given that,

Resistance of the wire, [tex]R=20\ \Omega[/tex]

Voltage, [tex]V=12\ V[/tex]

Using Ohm's law :

[tex]V=IR[/tex]

[tex]I=\dfrac{V}{R}[/tex]

[tex]I=\dfrac{12\ V}{20\ \Omega}[/tex]

[tex]I=0.6\ A[/tex]

Hence, the current flowing through the wire is 0.6 A

The current flowing through the wire will be 0.6 A. The formula for the ohm's law is used in the given problem.

Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.

The given data in the problem is;

The resistance of the wire is, R=20 Ω

The voltage of the battery is, V=12-Volt

The electric is, I in ampere.

When all physical parameters and temperature are constant,

Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.

This current-voltage connection may be expressed mathematically as,

The Equation of Ohm's Law;

[tex]\rm V=IR \\\\ I = \frac{V}{R} \\\\ I = \frac{12}{20} \\\\ I=0.6 \ A[/tex]

Hence the current flowing through the wire will be 0.6 A.

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Final answer:

Average speed is determined by dividing the distance traveled by the time of travel.

Explanation:

Average speed is calculated by dividing the distance traveled by the time of travel. It is a scalar quantity and does not have a direction associated with it.