a satellite of mass m takes time t to orbit a planet. if the satellite had twice as much mass, the time 169) for it to orbit the planet would be

Explanation:

The statement that is true concerning a substance with high specific heat is as follows: the substance cools down slowly after heating. an example substance is aluminum metal (option A)

Specific heat or specific heat capacity refers to the heat capacity per unit mass of a pure substance.

In other words, specific heat is defined as the amount of heat needed to increase the temperature of 1kg of a material by 1K and is expressed in terms of J/kg·K or equivalently J/kg·°C.

The specific heat capacity of a material is a physical property. It is also an example of an extensive property since its value is proportional to size.

Water is an example of a substance that has an extremely high specific heat capacity, which makes it good for temperature regulation.

Therefore, a substance with high specific heat cools down slowly after heating and an example is aluminum metal.

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The kinetic energy of the photoelectrons emitted is calculated as 2.23 *10^-19 J .

Photoelectrons are the electrons which are produced when energetic photon of radiation strikes a molecule. Photoelectron is an electron ejected from atom, molecule, or solid by an incident photon.

In terms of behavior and properties, photoelectrons are no different from other electrons.

E= h c/λ

= 6.6 *10^-34 * 3 * 10^8/400 * 10^-9

= 4.95 *10^-19 J

Work function = 1.7 eV= 1.7 * 1.6 *10^-19

= 2.72 *10^-19 J

Hence,  kinetic energy of photo electrons emitted will be;

= 4.95 *10^-19 J -  2.72 *10^-19 J

kinetic energy = 2.23 *10^-19 J

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By 2050, according to the International Renewable Energy Agency (IRENA), 90 percent of the world's electricity can and ought to come from renewable sources.

Through 2050, the EIA predicts that the world's electricity production will increase by 1.8% year. According to EIA estimates, global electricity production would increase by approximately 20 trillion kWh from 2018 levels to nearly 45 trillion kWh by 2050.

This energy is required for electrical production, heating, and transportation. The world's electricity is generated by renewable sources, such as hydroelectric, solar, and wind energy, for about 30% of the time.

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Answer:

2) the sounds pitch

The strength or level of sound pressure

please give brainliest

have a nice day!

Answer:

Hi can you explain more to the question your tryna ask us

Explanation:

you can do that in my comments

The work done by the crane on the load is positive. As the load was initially at rest, the crane had to apply a force greater than the weight of the load to lift it up against gravity. This means that the crane did work on the load by transferring energy to it in the form of gravitational potential energy.

The work done is equal to the product of the force applied by the crane and the distance over which the force was applied.

Once the load reaches the top of the tower, the work done on the load is zero. This is because the load is no longer moving and is not experiencing any change in potential energy or kinetic energy. The crane is also not applying any force on the load at this point.

As the crane gently sets the load down, the work done on the load is negative. The crane is applying a force that is less than the weight of the load, and the load is moving in the opposite direction to its initial motion. This means that the crane is transferring energy out of the load, resulting in a decrease in the load's potential energy. The work done is equal to the product of the force applied by the crane and the distance over which the force was applied, which is in the opposite direction to the direction of motion.

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To find the normal force exerted by the floor on the crate, we need to consider the forces acting on the crate in the vertical direction. The normal force is the force exerted by a surface to support the weight of an object and is always perpendicular to the surface.

In this case, the weight of the crate is acting downward, and the force exerted by the rope has both vertical and horizontal components. The vertical component of the rope's force counteracts the weight of the crate, and the normal force from the floor balances out this vertical force.

First, we need to find the vertical component of the force exerted by the rope: Vertical component = Force × sin(angle)

Vertical component = 10 N × sin(35°)

Next, we equate this vertical component to the weight of the crate to find the normal force:

Normal force = Weight of crate = mass × acceleration due to gravity

Normal force = 40 kg × 9.8 m/s²

By substituting the given values and evaluating the expressions, we can find the normal force exerted by the floor on the crate.

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B. The number of coils of wire around the core

Answer:

B.

Explanation:

The number of coils of wire around the core

The force experienced by a current-carrying conductor placed in a magnetic field is largest when the conductor is perpendicular to the magnetic field.

The force experienced by a current-carrying conductor placed in a magnetic field is largest when the conductor is perpendicular to the magnetic field. This is known as the right-hand rule.

Here's how it works:
1. Imagine holding the conductor in your right hand, with your thumb pointing in the direction of the current.
2. Extend your fingers so that they are perpendicular to your thumb.
3. The direction in which your fingers curl is the direction of the magnetic field lines.
4. When the conductor is perpendicular to the magnetic field, the magnetic field lines cut across the conductor at a 90-degree angle, resulting in the maximum force.
5. This force is described by the equation,

       F = BIL,

       where,

       F is the force,

       B is the magnetic field strength,

       I is the current,

       and L is the length of the conductor.
6. If the angle between the conductor and the magnetic field is less than 90 degrees, the force will be smaller, and if the angle is greater than 90 degrees, the force will be zero.

In summary, the force experienced by a current-carrying conductor placed in a magnetic field is largest when the conductor is perpendicular to the magnetic field.

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Answer:

(a) RC time constant of the circuit is 6.9 × 10⁻⁶ ms

(b) The potential drop across the capacitor 1.00 s after the switch is closed is 0 V

Explanation:

The given parameters are

The length of the graphite pencil, L = 5.00 cm

The diameter of the graphite, D = 0.05 mm

The resistivity of the graphite, ρ = 1.38 × 10⁻⁵ Ω/m

The capacitance of the capacitor, C = 10.0 mF

The voltage of the power source, V = 0.50-V

(a) The RC time constant of the circuit, τ, is given as follows;

τ = R × C

Where;

R = The resistance of the graphite = L × ρ

C = The capacitance of the capacitor

∴ R = 5.00 cm × 1.38 × 10⁻⁵ Ω/m = 6.9 × 10⁻⁷ Ω

RC time constant of the circuit, τ = 6.9 × 10⁻⁷ Ω × 10.0 mF = 6.9 × 10⁻⁶ ms

RC time constant of the circuit, τ = 6.9 × 10⁻⁶ ms

(b) The potential drop after t = 1.00 s is given as follows;

\(i = \dfrac{V}{R} \cdot e^{-\dfrac{t}{R\cdot C} }\)

Where;

I = The current in the circuit

V = The voltage in the circuit = 0.50 V

R = resistance in the circuit = 6.9 × 10⁻⁷ Ω

C = The series capacitance = 10.0 mF

t = The time taken = 1.00 s

Plugging in the variable values, gives;

\(I = \dfrac{0.5}{6.9 \times 10^{-7}} \cdot e^{-\dfrac{1.00}{6.9 \times 10^{-7}\times 10.0 \ mF} } = 0\)

V(1) = I·R = 0 × R = 0

The potential drop across the capacitor 1.00 s after the switch is closed, V(1)  = 0 V

Answer:

required power to stop the car is 8 × 10^5W

Explanation:

Power is the rate at which energy is transferred. You need to transfer 8 million joules of kinetic energy into 8 million joules of heat in the car's brakes in 10 seconds.

Power = Change in Energy/Time

P = E/t = 8 × 10^6 J/10s = 8 × 105W

Answer: required power to stop the car is 8 × 10^5W.

NB*- There is no answer present on brainly for this question so i am unable to upload its answer's any link here.

The work required to stop a car traveling along a horizontal road with a kinetic energy of \(8 \times 10^6 J\) in 10 seconds is \(4 \times 10^6 J\).

The work done on an object is equal to the change in its kinetic energy. In this case, the car has an initial kinetic energy of  \(8 \times 10^6 J\). To stop the car, we need to bring its kinetic energy to zero. This means the work done on the car is equal to its initial kinetic energy. Therefore, the work required to stop the car is  \(8 \times 10^6 J\).

It is important to note that work is a scalar quantity and can be positive or negative depending on the direction of the force and displacement. In this case, since we are stopping the car, the work done is negative because the force applied opposes the car's motion. However, the magnitude of the work remains the same. Therefore, the work required to stop the car in 10 seconds is  \(8 \times 10^6 J\), or  \(4 \times 10^6 J\) in magnitude.

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Answer:

Known variously as the Newcomb–Benford law, the law of anomalous numbers, or the first-digit law, Benford's Law is the observation that the first digit in many real-world collections of numerical data will be tiny, as shown by the example of the first-digit law.

Explanation:

Hope it helps:)

Answer:

a - temperature

b sun ( how things work science)

Answer:

(A)

Explanation:

because they are asking at temperature does water boil they can do experaments to find or they can use science

a)

Since we have a constant angular acceleration we have that:

Plugging the values we know we have that:

Therefore it will take 0.516 (rounded to three decimals) seconds to achive this angular velocity.

b)

To find how many revolutions he needs we first calculate the change in angular position using the formula:

Now we divide this change in angular position by 2pi (the angle equivalent to a revolution) to get the revolutions:

Therefore it takes 0.094 (round to three decimals) revolutions to get to this angular velocity.

c)

The torque is the force by the radius, then we have:

But the torque is also equal to the moment of inertia multiplied by the angular acceleration:

Then we have:

Now we use the formula for angular acceleration to get the time:

Therefore it takes 0.573 seconds to stop the merry go round.

The amount of radiation damage in human exposure to ionizing radiation is measured in terms of sieverts (Sv). Option d is correct.

Sieverts are the internationally recognized units for measuring the health effects of ionizing radiation on the human body. The sievert takes into account the type of radiation, the dose of radiation, and the sensitivity of the affected tissue or organ.

The other options listed (grays, relative biological effectiveness, and rads) are also used to measure radiation, but they are more commonly used to describe the amount of radiation absorbed or the biological effectiveness of a specific type of radiation. The sievert is the preferred unit for radiation exposure measurement and is used to establish exposure limits and guidelines for radiation protection. Option d is correct.

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The statement "a short circuit is one where needed connections are missing, such as when a wire breaks" is false. A short circuit is a type of electrical circuit in which the current flows through a path of low resistance, bypassing the intended load or electrical device.

This can occur when two conductors in a circuit accidentally touch each other, or when the insulation between two conductors breaks down.

On the other hand, a missing connection, such as when a wire breaks, would result in an open circuit, which would prevent the flow of current through the circuit altogether.

Therefore, a short circuit and an open circuit are two distinct types of electrical faults, and they have different causes and effects on the electrical system.

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Answer:

The woman displaces a volume of air equivalent to her own volume; VV; V=\dfrac{m}{\rho_{\text{woman}}}=\dfrac{60}{980}=0.0612\mathrm{\ m^3}V= ρ woman m = 98060 =0.0612 m 3

Explanation:

The initial temperature of the water was approximately 81.67°C.

To solve this problem, we can apply the principle of energy conservation. The heat lost by the copper block is equal to the heat gained by the water.

The heat lost by the copper block can be calculated using the formula: Q1 = m1 * c1 * ΔT1,

where m1 is the mass of the copper block (40 g), c1 is the specific heat capacity of copper (0.39 J/g°C), and ΔT1 is the change in temperature (final temperature - initial temperature of the copper block).

The heat gained by the water can be calculated using the formula: Q2 = m2 * c2 * ΔT2, where m2 is the mass of the water (105 g), c2 is the specific heat capacity of water (4.18 J/g°C), and ΔT2 is the change in temperature (final temperature - initial temperature of the water).

Since the copper block and the water reach equilibrium, Q1 = Q2. Therefore, we can equate the two equations:

m1 * c1 * ΔT1 = m2 * c2 * ΔT2

Substituting the given values:

(40 g) * (0.39 J/g°C) * (95°C - initial temperature) = (105 g) * (4.18 J/g°C) * (24°C - initial temperature)

Simplifying the equation and solving for the initial temperature of the water gives us approximately 81.67°C.

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The Earth and the Moon are believed to have formed at roughly the same time, from a giant impact between a Mars-sized object and the early Earth. However, there are no known rocks on Earth that are as old as the Moon. This is because the Earth has a dynamic geologic system, with plate tectonics, erosion, and weathering processes that constantly reshape the Earth's surface and destroy or bury old rocks.

On the other hand, the Moon has a much less dynamic geologic system, with little to no tectonic activity or atmosphere. As a result, the rocks on the Moon's surface have been well-preserved over billions of years, and samples collected by the Apollo missions have revealed that some of the Moon's oldest rocks are around 4.5 billion years old, which is close to the age of the solar system.

In contrast, the oldest rocks found on Earth are about 4 billion years old, which is relatively young compared to the Moon's oldest rocks. Most of the Earth's oldest rocks have been destroyed or altered by tectonic activity, erosion, and weathering, making it difficult to find rocks as old as the Moon.

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Answer:

The atom consists of a tiny nucleus surrounded by moving electrons. The nucleus contains protons, which have a positive charge equal in magnitude to the electron's negative charge. The nucleus may also contain neutrons, which have virtually the same mass but no charge.

Explanation:

According to Newton's first law, an object will accelerate at a constant rate if its net force is zero. The calculated value is 39.2 N

This indicates that the velocity is constant but does not necessarily imply that the item is at rest.

F = m a

= 4 kg x 2.5 m/s/s x 10 N, correct.

The formula for Fgrav is:

Fgrav = m • g

= 4 kg • 9.8 m/s/s

= 39.2 N since the mass is known.

The normal force is equivalent to the gravitational force since there is no vertical acceleration. A force in physics is any interaction that, if left unchecked, will alter an object's motion. An object with mass can change its velocity due to a force, which includes starting to move from a state,

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The statement " The effective capacity utilization can be smaller than the design capacity utilization." is True because design capacity utilization refers to the maximum utilization of the system's capacity under ideal conditions.

Effective capacity utilization refers to the actual utilization of a system's capacity, taking into account factors such as downtime, maintenance, and other operational constraints. On the other hand, design capacity utilization refers to the maximum utilization of the system's capacity under ideal conditions.

In practice, it is common for the effective capacity utilization to be smaller than the design capacity utilization. This occurs due to various factors that affect the actual production or service delivery. These factors can include equipment breakdowns, scheduled maintenance, employee absenteeism, supply chain disruptions, and variations in customer demand.

The effective capacity utilization considers the real-world operational conditions and takes into account the constraints and limitations that can impact the system's performance. Therefore, it is not uncommon for the effective capacity utilization to be lower than the design capacity utilization, which represents the theoretical maximum utilization achievable under ideal circumstances.

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Answer:

Explanation:

The mass of the object can be found by using the formula

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

p is the momentum

v is the velocity

From the question we have

\(m = \frac{10}{20} = \frac{1}{2} \\ \)

We have the final answer as

Hope this helps you

Answer: Approximately 22 cm

=========================================================

Explanation:

The unstretched spring is 12.0 cm long. When adding a load of 5.0 N, it stretches to 15.0 cm. This is a displacement of 15.0 - 12.0 = 3.0 cm, which is the amount the spring is stretched.

Convert this displacement to meters (so that it fits with the meters unit buried in Newtons).

3.0 cm = (3.0)/100 = 0.03 m

Apply Hooke's Law to find the spring constant k

F = -kx

5.0 = -k*(0.03)

k = -(5.0)/(0.03)

k = -166.667 approximately

Now we must find the displacement x when F = 15 newtons

F = -kx

-kx = F

x = F/(-k)

x = -F/k

x = -15/(-166.667)

x = 0.089 approximately

x = 0.1

The displacement to one decimal place is about 0.1 meters, which converts to 100*0.1 = 10 cm

So the spring will be stretched to about 12cm+10cm = 22 cm

Answer:

 W = 1960 N

T = 1960 N     in the upward direction

Explanation:

Let's apply Newton's second law to this exercise with acceleration equal to zero, translational equilibrium

Weight is

            W = m g

            W = 200 9.8

            W = 1960 N

In the attachment we can see a diagram

             T -W = 0

             T = W

             T = 1960 N

in the upward direction

credit - somebody else