A 10.0 kg rock is at the top of a 20.0 m. tall hill. How much potential energy does it have?

Answer:

Motion is used to describe physical properties, while movement is used to describe the qualities of motion.

When a negatively charged object is introduced close to the ball of the electroscope, if the metal leaves of the instrument separate even more, the charge close to the ball is likewise negatively charged.

Yes, it is possible to determine the sign of the charge close to the ball of an electroscope if the electroscope itself has a negative charge.

An electroscope consists of a metal ball at the end of a metal rod, with metal leaves hanging from the ball. The ball and the leaves are all made of conductive materials. When a charged object is brought close to the ball, it induces a separation of charges in the leaves, causing them to repel each other and move apart.

If the electroscope is negatively charged, it means that the metal leaves of the electroscope have an excess of electrons. When a positively charged object is brought close to the ball, it will attract electrons from the ball, which will flow down the metal rod and into the leaves. This will neutralize the negative charge on the leaves and cause them to collapse.

On the other hand, if a negatively charged object is brought close to the ball, it will repel the electrons in the ball and cause them to move towards the top of the metal rod, inducing a greater negative charge on the leaves. This will cause them to move even further apart, indicating the presence of a negative charge close to the ball.

Therefore, if the metal leaves of the electroscope move apart further when a negatively charged object is brought close to the ball, it indicates that the charge close to the ball is also negative.

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Answer:

\(a_1 = 1.446m/s^2\)

Explanation:

Given

\(m_1 = 70.0kg\) -- Mass of the boy

\(m_2 = 45.0kg\) -- Mass of the girl

\(a_2 = 2.25m/s^2\) -- Acceleration of the girl towards the boy

Required

Determine the acceleration of the boy towards the girl (\(a_1\))

From the question, we understand that the surface is frictionless. This implies that the system is internal and the relationship between the given and required parameters is:

\(m_1 * a_1 = m_2 * a_2\)

Substitute values for \(m_1, m_2\) and \(a_2\)

\(70.0 * a_1 = 45.0 * 2.25\)

Make \(a_1\) the subject

\(\frac{70.0 * a_1}{70.0} = \frac{45.0 * 2.25}{70.0}\)

\(a_1 = \frac{45.0 * 2.25}{70.0}\)

\(a_1 = \frac{101.25}{70.0}\)

\(a_1 = 1.446m/s^2\)

Hence, the acceleration of the boy towards the girl is 1.446m/s^2

Energy is destroyed because animals are higher levels do not need as much energy. That is option B.

Food chain is defined as the sequence that shows the feeding relationship between different organisms and how energy flows from the producers to decomposers.

The producers which are the plants traps in energy from the sunlight with the help of their green pigment called the chlorophyll.

The energy continuously flows from the producers to consumers and then to the decomposers.

From the law of conservation of energy, it is neither created nor destroyed.

Therefore energy is destroyed because animals at higher levels do not need as much energy, is not a valid statement.

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Answer:

Input force of pulley system = 200 N

Explanation:

Given:

Mechanical advantage of pulley system = 5

Output force from pulley system = 1,000 N

Find;

Input force of pulley system

Computation:

Mechanical advantage = Output force / Input force

Mechanical advantage of pulley system = Output force from pulley system / Input force of pulley system

5 = 1,000 / Input force of pulley system

Input force of pulley system = 1,000 / 5

Input force of pulley system = 200 N

The coefficient of kinetic friction between the bag and the ground is found to be 0.0251. It represents the ratio of the frictional force to the normal force acting between them.

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Answer:

1. Control of External Factors: One precaution that should be taken when conducting an experiment with an extension spiral spring is to control external factors that may affect the accuracy of the results. This can include controlling temperature, humidity, and air pressure to minimize any environmental changes that may affect the spring's behavior.

2. Proper Measurement Techniques: Another precaution to take is to use proper measurement techniques. This can include using accurate and precise measuring instruments, such as a ruler or caliper, and properly measuring the length and force of the spring's extension.

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 75 × 3

We have the final answer as

Hope this helps you

The change in internal energy is 10,000 J.

Given that, Work = 500 J

Heat Transfer = 9500 J

Internal energy can be altered by the temperature difference between a system and its surroundings.

We need to calculate the change in internal energy.

Let us use the equation of internal energy of a system,

ΔU = Q - W

where, Q is heat

W is work done

Let us put the values in the formula,

ΔU = -9500 - 500 = -10,000 J

Negative sign of heat is taken as the heat is lost in the process.

Thus, the change in internal energy is 10,000 J.

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Answer:

Step-up transformers are used at power stations to produce the very high voltages needed to transmit electricity through the National Grid power lines. These high voltages are too dangerous to use in the home, so step-down transformers are used locally to reduce the voltage to safe levels.

Answer:

Explanation:

F = ma. For us, this looks like

60 = 30a and

a = 2 m/s/s

If the force goes up to, say, 90, then

90 = 30a and

a = 3...if the force goes up, the acceleration also goes up.

If the mass goes up to say, 60, and the force stays the same, then

60 = 60a and

a = 1...if the mass goes up, the acceleration goes down.

Answer:

1. rest

2. motion

Explanation:

A 15 kilogram eagle is flying at 20 meters/sec. The kinetic energy (in joule) of the eagle is 300 joules

The formula for kinetic energy can be used:

K = 1/2m\(v^{2}\)

where K is kinetic energy, m is mass, and v is velocity.

Plugging in the given values for mass and velocity, we get:

K = 1/2(15 kg)\((20 m/s)^{2}\)

K = 1/2(15)(400)

K = 1/2(600)K = 300 J

Therefore, the kinetic energy of the eagle is 300 joules.

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Statement:

Mateo moved the teacher's table with 50 N of force for 2 meters.

To find out:

The work done in pushing the table.

Solution:

Answer:

The work done in pushing the table is 100 J.

Hope it helps.

If you have any query, feel free to ask.

Answer:

a)    I = 13.38 kg m / s, b)    F = 1,373 10³ N

Explanation:

The impulse is given by the relation

          I = ∫ F dt = Δp

          I = p_f -p₀

          I = m (v_f - v₀)

take the ball's exit direction as positive, whereby the ball velocities

v₀ = -90mph, the final velocity v_f = + 54 m / s

Let's reduce the units to

         I = 0.142 [54- (-40.23) ]

      the SI system

        v₀ = - 90 mph (1609.34 m / 1 mile) (1h / 3600 s = -40.23 m / s

        m = 142 g (1kg / 1000) = 0.142 kg

we calculate  

          I = 0.142 [54- (-40) ]

          I = 13.38 kg m / s

b) let's use the definition of momentum

         I = ∫ F .dt

         I = F ∫ dt

         F = I / t

         F = 13.38 / 0.008

         F = 1,373 10³ N

Answer:

B on edgen

Explanation:

The water in pot X has more kinetic energy than the water in pot Y.

Answer:

the water in pot x has more kenetic energy.

Explanation:

not sure if its the answer. just found it on quizlet.

Answer:

1) To find the volume of the wood block, divide the mass by the density:

Volume = 583.3 g / 2.7 g/cm³

Volume = 216.24 cm³

2) To find the density of the butter, divide the mass by the volume:

Density = 319 g / 350 cm³

Density = 0.9114 g/cm³

Explanation:

Theres no screen shot here so I can't help.

Answer:

mulitipy the numbers and u will get the answer!!

Answer:

The object will continue to move with a constant velocity.

Explanation:

Hope this helps you :)

Answer:

meter

Explanation:

Displacement (symbolized d or s ), also called length or distance, is a one-dimensional quantity representing the separation between two defined points. The standard unit of displacement in the International System of Units ( SI ) is the meter (m). Displacement is usually measured or defined along a straight line.

Answer:

6

.40 recharge

1.0v

45.0v

The given statement "the smallest kinetic energy that an electron in a box (an infinite well) can have is zero."  is False as smallest kinetic energy that an electron in an infinite well (a box) can have is not zero, but rather a non-zero value determined by the boundary conditions of box.

In an infinite well, the electron is confined to a finite region of space by a potential energy barrier that is infinite outside the box and zero inside it. The electron's wave function is a standing wave that oscillates between two walls of the box, and the allowed energies of the electron are quantized, meaning they can only take on discrete values.

The ground state of an electron in an infinite well corresponds to the lowest possible energy level, which has a non-zero kinetic energy. This is because the electron's wave function cannot have a node at both ends of the box, and so it must have a non-zero slope at the edges, resulting in a finite kinetic energy.

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Answer:

• From first newtons equation of linear motion:

\({ \boxed{v = u + at}}\)

• from that equation, let's get the relation for the change in velocity;

\((v - u) = at \\ { \boxed{ \boxed{\delta v = at}}}\)

• a is the acceleration, a = 0.3 m/s and t is time, t = 3s

\( \delta v = (0.3 \times 3) \\ { \underline{ \underline{ \delta v = 0.9 \: \: m {s}^{ - 1} }}}\)

Answer: A. 0.9 m/s

To calculate the 95th percentile of the flood volume distribution, you need the specific data set and values for the distribution.

The 95th percentile represents the value below which 95% of the observations fall. In the context of flood volume distribution, it indicates the flood volume level at which 95% of floods recorded are below this value. To determine this, you need a data set containing flood volume values and either a parametric method (e.g., assuming a normal distribution) or a non-parametric method (e.g., empirical or order statistics) to calculate the 95th percentile.

Without the specific data set and its values, we cannot provide a precise 95th percentile value for the flood volume distribution. Once you have the data, you can apply an appropriate statistical method to find the 95th percentile.

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Answer:

Approximately \(0.48\; \rm m\cdot s^{-1}\).

Explanation:

Momentum would be conserved since there's no friction on this friend, and all other forces on her are balanced. Therefore:

\(\begin{aligned}& \text{Resultant momentum of (friend and pumpkin)} \\ =\; & \text{Initial momentum of (friend)} \\ & + \text{Initial momentum of (pumpkin)}\end{aligned}\).

Momentum \(p\) the product of mass \(m\) and velocity \(v\). That is: \(p = m \, v\).

The initial momentum of this friend is \(0\; \rm kg \cdot m \cdot s^{-1}\) since she was initially not moving (an initial velocity of \(0\; \rm m\cdot s^{-1}\).)

The initial momentum of the pumpkin would be:

\(\begin{aligned}p &= m \, v \\ &= 3.6 \; \rm kg \times 9.5\; \rm m\cdot s^{-1} \\ &= 34.2\; \rm kg \cdot m \cdot s^{-1}\end{aligned}\).

Therefore:

\(\begin{aligned}& \text{Resultant momentum of (friend and pumpkin)} \\ =\; & \text{Initial momentum of (friend)} \\ & + \text{Initial momentum of (pumpkin)} \\ =\; &0\; {\rm kg \cdot m \cdot s^{-1}} + 34.2\; {\rm kg \cdot m \cdot s^{-1}} \\ =\; & 34.2\; {\rm kg \cdot m \cdot s^{-1}}\end{aligned}\).

Rearrange the equation \(p = m \, v\) to find an expression for velocity \(v\) given momentum and mass:

\(\displaystyle v = \frac{p}{m}\).

Note that the "final momentum of friend and pumpkin" in the previous equation refers to the resultant velocity of the friend with the pumpkin in her hand. Thus, it would necessary to use the combined mass of the friend and the pumpkin \((68\; {\rm kg} + 3.6 \; {\rm kg})\) when calculating the resultant velocity:

\(\begin{aligned}& \text{Resultant velocity of (friend and pumpkin)} \\ =\; & \frac{\text{Resultant momentum of (friend and pumpkin)}}{\text{Mass of (friend and pumpkin)}} \\ =\; & \frac{34.2\; {\rm kg \cdot m \cdot s^{-1}}}{68\; {\rm kg} + 3.6\; {\rm kg}} \\ \approx \; & 0.48\; \rm m \cdot s^{-1}\end{aligned}\).

Answer:

I think d or b maybe it's d