how much force is needed to lift a 25 kg mass at a constant velocity?

To summarize, a long time after the switch is closed in an RC circuit with a resistance of 5.0, the current through the resistor becomes zero because the capacitor is fully charged and acts like an open circuit.

The current through the resistor in an RC circuit a long time after the switch is closed depends on the values of the resistance and capacitance in the circuit. In this case, you mentioned a resistance of 5.0.

An RC circuit consists of a resistor (R) and a capacitor (C) connected in series to a voltage source. When the switch is closed, the capacitor starts to charge up, and the current flowing through the circuit decreases over time.

In the case of a long time after the switch is closed, the capacitor becomes fully charged, and it acts like an open circuit. This means that no current flows through the resistor in this situation.

To summarize, a long time after the switch is closed in an RC circuit with a resistance of 5.0, the current through the resistor becomes zero because the capacitor is fully charged and acts like an open circuit.

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Answer:

Both particle and wave properties

Explanation:

Light is defined as a particle and a wave, and even as a combination of a particle and a wave. A unit of light is the photon. Higher energy photons behave like particles and low energy photons behave like waves.

Experiments performed with light indicate that light exhibits both particle and wave properties.

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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"thanks for the points!!! and have a  (terrible) day"  - puppetasap4 :)

Answer:

"thanks for the points!!! and have a  (terrible) day"  - puppetasap4 :)

Explanation:

Answer:

do explain what u need help with?

A box is being dragged across the floor at a constant speed by a rope pulling horizontally on it. friction is not negligible. Weight (W), the normal force( N), and the tension force( T )in the string will all be forces operating on the box.

The force transmitted through a rope, string, or wire while opposing forces pull it is referred to as the tension force.

Energy is drawn equally from both ends by the tension force, which is exerted along the entire length of the wire.

A box is being dragged across the floor at a constant speed by a horizontally pulling rope. Friction has a big impact.

As a result, the weight W, normal force N, and tension force T in the string will all be acting on the box.

Your question is incomplete but most probably your full question was

A box is being dragged across the floor at a constant speed by a rope pulling horizontally on it. friction is not negligible. identify all the forces acting on the box.

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Answer:

ETotal=38505J

Explanation:

Known values:

m=150kg

h=20m

v=11m/s

KE=mv^2/2

PE=mgh

ETotal=PE+KE

KE=(150(11^2))/2

KE=9075

PE=150(9.81)(20)

PE=29430

ETotal=9075+29430

ETotal=38505J

Answer:

146 neutrons.

Explanation:

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Answer: The atomic number of uranium (see periodic table) is 92, and the mass number of the isotope is given as 238. Therefore, it has 92 protons, 92 electrons, and 238 — 92 : 146 neutrons.

Explanation:

Answer:

Correct Answer: Option B

Explanation:

Explanation

P1/T1 = P2/T2

80/(273+47) = P1/(273+27) = 75Nm-2

Answer: 75.0 Nm^-2

Explanation:

P1/T1 = P2/T2 80/(273+47) = P1/(273+27) = 75Nm-2

Answer:

Explanation:

Kinetic force is the force caused kinetic energy. Kinetic energy is energy this is in movement such as a moving car or a falling rock.

Answer:

Gravity

Explanation:

When the ball is falling to the ground, there is only one force- gravity. In some cases, there may be air resistance, but that seems to be neglected here.

Normal force:

Cannot be included. Normal force is only applicable when object is on a surface, and it acts perpendicular to the surface. Since the ball is falling, there is no surface, and therefore no normal force. This question gives you unnecessary information, designed to trick you. Please remember when normal force is applicable.

Friction force:

Also only applicable when object is moving, and is on the table. Friction only applies when there is an applied force. There is no applied force when the ball is falling, so therefore no friction force.

Force of fall:

First of all, what is this? There is nothing called force of fall.

Gravity:

This is the only one that applies. Just draw a vector arrow from the bottom of the ball and label it mg (acceleration due to gravity).

READ COMMITTED is the least restrictive isolation level that can prevent dirty reads.

The least restrictive isolation level that will prevent dirty reads is the READ COMMITTED isolation level. This level allows only committed data to be read by transactions. If a transaction is updating a row, it locks that row to ensure that other transactions can't read or modify the data until the transaction is completed and the lock is released. This means that dirty reads cannot occur since uncommitted data is not accessible.READ COMMITTED level allows for better concurrency and performance since it doesn't block other transactions from accessing other rows that are not being modified.

In conclusion, READ COMMITTED is the least restrictive isolation level that can prevent dirty reads.

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Answer:

a) The athlete’s velocity just before reaching the pad is 3.038 m/s.

b)  The constant force exerted on the pole vaulter due to the collision is approximately 499.806 Newtons.

Explanation:

a) The athlete's velocity just before reaching the pad can be calculated using the equation v = gt, where g is the acceleration due to gravity (approximately 9.8 m/s²) and t is the time taken to come to rest after landing.

Using the given values, t = 0.31 s, we can calculate the velocity as v = 9.8 m/s² * 0.31 s = 3.038 m/s.

b) To calculate the constant force exerted on the pole vaulter due to the collision, we can use the impulse-momentum principle. The change in momentum is equal to the impulse exerted on the athlete, which can be calculated using the equation Δp = m * Δv, where m is the mass of the athlete and Δv is the change in velocity.

The initial velocity of the athlete is 0 m/s (as they fall from rest) and the final velocity is 3.038 m/s (from part a). Therefore, Δv = 3.038 m/s - 0 m/s = 3.038 m/s.

Substituting the given mass, m = 51 kg, we can calculate the force as F = Δp / Δt, where Δt is the time interval for the collision (0.31 s).

F = (m * Δv) / Δt = (51 kg * 3.038 m/s) / 0.31 s ≈ 499.806 N.

Therefore, the constant force exerted on the pole vaulter due to the collision is approximately 499.806 Newtons.

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The acceleration of the car is -7.84 m/s² (deceleration) and the car will travel approximately 45.2 meters before stopping.

To find the acceleration of the car, we need to calculate the net force acting on it. The net force is the difference between the frictional force and the force due to the car's weight.

Frictional force = coefficient of friction * weight of the car

The weight of the car is given by the equation:

Weight = mass * gravity

Weight = 1800 kg * 9.8 m/s²

The coefficient of friction is given as 26% of the weight of the car, so:

Coefficient of friction = 0.26 * weight of the car

The net force is given by:

Net force = Frictional force - Weight

Using the equation F = ma (Newton's second law), where F is the net force and m is the mass of the car, we can solve for the acceleration (a):

Net force = ma

(ma) = Frictional force - Weight

a = (Frictional force - Weight) / m

Substituting the given values into the equation, we have:

a = (0.26 * Weight - Weight) / m

Calculating the acceleration:

a = (0.26 * 1800 kg * 9.8 m/s² - 1800 kg * 9.8 m/s²) / 1800 kg

a ≈ -7.84 m/s² (deceleration)

To find the distance traveled before stopping, we can use the equation of motion:

v² = u² + 2as

Here, the initial velocity (u) is 100 km/h, which needs to be converted to m/s:u = 100 km/h * (1000 m/1 km) * (1 h/3600 s)

u ≈ 27.8 m/s

Since the car comes to a stop, the final velocity (v) is 0 m/s.

Plugging in the values, the equation becomes:

0 = (27.8 m/s)² + 2 * (-7.84 m/s²) * s

Solving for s (distance traveled):

s = -((27.8 m/s)²) / (2 * (-7.84 m/s²))

s ≈ 45.2 meters

Therefore, the car has an acceleration of approximately -7.84 m/s² (deceleration), and it travels around 45.2 meters before coming to a stop.

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here's the answer to your question

Answer:

19.6 m

Explanation:

Start with the physics distance formula

df = do + vo t + 1/2 a t^2    

    do = original position = 0   vo = origianl velocity = 0   (starts at rest)

so this becomes    d = 1/2 a t^2

                                   = 1/2 ( 9.81 m/s^2) (2 s)^2 = 19.6 m

Answer:

A She has good emotional health.

Explanation:

Answer:

1323

Explanation:

we know ,

weight = m*g

= 135 * 9.8 ( acceleration due to gravity in earth is 9.8 m/S2)

= 1323 N

Answer:

I think c is the answer but I have a little concern on d too

The volume of the heated balloon = 3.08L

What is Charlee's Law?

Charlee's Law is a law in the United States that was passed in 2015 in honor of Charlee Campbell, a six-year-old girl who tragically died due to medical negligence. The law provides legal protection for children who are victims of medical malpractice or negligence. It requires that hospitals and other medical facilities take steps to prevent medical errors and notify parents or guardians prior to any medical treatment. It also requires medical practitioners to use a standardized system for documenting and communicating medical information, and for health care providers to complete annual training on preventing medical errors. Charlee's Law is an important step forward in protecting the rights of children in the medical setting.

You will need to use Charles' law to solve this problem. The equation is

V1/T1=V2/T2

V1 =2.50L

T1=323K

v2=?

T2=398K

Therefore V2 = V1T2/T1

  = (2.5  × 398 )/ 323

 = 3.08L

Therefore the volume of the heated balloon   = 3.08L

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Answer:

b. momentum, mass

Explanation:

If you increase the mass of an object, the momentum of the object increases proportionally

Answer:

B is correct.

Explanation:

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The formula l = f (l, gm, s) means that leadership effectiveness is a function of not just the leader's characteristics (l) and is thus False.

The formula is also the group members' characteristics (gm) and the situation (s). While being made of the right stuff, such as having natural charisma and communication skills, can certainly be advantageous for a leader, it is not the only factor that determines their effectiveness.

The group members' attitudes, skills, and willingness to follow also play a significant role, as does the context in which the leader is operating. For example, a leader who excels in a structured, hierarchical environment may struggle to be effective in a more collaborative, team-based setting.

Therefore, while having certain qualities can enhance a leader's effectiveness, it is important to also consider the other factors that contribute to their success.

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The full question is:

The formula l = f (l, gm, s) implies that being made of the right stuff is the most important factor influencing leadership effectiveness. True or false?

Answer:

force that acts in the opposite direction as gravitational force

Answer:

Normal force is a force exerted by the surface on an object in contact with

The heat lost by water is equal to the heat gained by ice here. The heat lost from water for a temperature change of 25 to 10 degree Celsius is 12300 J.

Calorimetry is an analytical technique used to determine the heat energy absorbed or evolved by a system. The calorimetric equation relating the heat energy q with the mass m, specific heat c and the temperature difference ΔT is :

q = m c ΔT

Here, the heat energy gained by the dry ice is equal to the heat lost from water.

temperature difference for water = 25- 10 °C = 15°C

thus, 15°C is lost from water.

mass of water = 200 g

q =200 g × 4.12 J/°C g × 10°C = 12300 J

Therefore, the heat energy lost from water is 12300 J.

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The energy delivered to the toaster is approximately 518,400 J or 518.4 kJ.

The energy delivered to the toaster can be calculated as the product of the power and time, or P × t.

The power, P, can be calculated using Ohm's law, which states that P = V^2 / R, where V is the voltage and R is the resistance.

Plugging in the values, we get

P = (120 V)^2 / (14 W)

P = 8640 W

Since the toaster was operated for one minute, or 60 seconds, the energy delivered to the toaster can be calculated as:

E = P × t

E = 8640 W × 60 s

E = 518400 J

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Since an object's instantaneous velocity equals the derivative of its displacement at a certain point, we can also state that the instantaneous velocity at time t = 1 is around 2 meters per second.

The derivative of x with respect to t, or the upper limit of the average velocity as the elapsed time approaches 0, is the instantaneous velocity of an object:

v (t) equals d d t x (t). v (t) equals d d t x (t).

Instantaneous velocity is a vector having a dimension of length per time, similar to average velocity. The speed of an object at a specific time is its instantaneous speed. The instantaneous velocity is obtained by adding the direction to the speed.

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Answer:

The sun and other stars consist of plasma. Plasma is also found naturally in lightning and the northern and southern lights. Human-made plasma is found in fluorescent lights, plasma TV screens, and plasma spheres

Explanation:

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Answer:

b

Explanation:

it is the only one that has to do with animals

Answer:

The answer is B

Explanation:

Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

Answer:

The answer is b

Explanation: