When moving a load manually a worker must ask for assistance if the load is:_________

Answer:

Because the ball is dropped, we are going to assume its initial velocity is 0. With that said, acceleration is essentially the change in the velocity versus the change in time, hence the unit m/s^2, which can be thought of as “meters per second per second.” The only force acting on the ball is gravity.

That being said, you can simply divide the change in velocity by the change in time, giving you an answer of 9.8 m/s^2, which is the value of g. Even if they did not give you a time, the answer would still always be the value of g (that is if the question pertains to earth), as acceleration due to gravity is a constant.

Explanation:

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The correct option is 4.

The process by which the isotope 56Fe decays into the isotope 56Co is beta decay.

The correct option is 4.What is beta decay? Beta decay is a type of radioactive decay in which a beta particle, a positron, or an electron is emitted by the nucleus of an atom. Beta decay is a decay process in which the atomic nucleus emits beta particles, which are high-energy, high-speed electrons or positrons.

In beta decay, a neutron in the nucleus transforms into a proton, causing the emission of an electron and a neutrino in the process. The isotope 56Fe decays into the isotope 56Co by the following beta decay process:56Fe26 → 56Co27 + β−where β- is a beta particle, and it is emitted from the nucleus, resulting in an increase in atomic number Z by one, while atomic mass number A remains unchanged. The daughter isotope is 56Co.

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Given that the radius of the circular path is r = 142 m and the coefficient of the friction is

The condition for the car to travel safely is

Frictional force = centrifugal force

Here, m is the mass of the car and the acceleration due to gravity is g = 9.8 m/s^2.

v is the maximum speed of the car.

Explanation:

7a) The work function (ϕ) is the minimum energy required to remove an electron from the metal surface. It is related to the threshold frequency (fo) by the equation:

ϕ = hfo

where h is Planck's constant (6.626 x 10^-34 J s).

The threshold wavelength (Ao) can be calculated from the threshold frequency using the equation:

c = λf

where c is the speed of light (3.00 x 10^8 m/s).

Given that the work function of the metal surface is 3.0 eV, we have:

ϕ = 3.0 eV = (3.0 x 1.6 x 10^-19) J fo = ϕ/h = (3.0 x 1.6 x 10^-19) J / (6.626 x 10^-34 J s) ≈ 4.53 x 10^14 Hz Ao = c/fo = (3.00 x 10^8 m/s) / (4.53 x 10^14 Hz) ≈ 661 nm

Therefore, the threshold frequency is 4.53 x 10^14 Hz and the threshold wavelength is approximately 661 nm.

7b) The maximum kinetic energy of the emitted photoelectrons can be calculated using the equation:

KEmax = hf - ϕ

where h is Planck's constant, f is the frequency of the incident radiation, and ϕ is the work function of the metal surface.

The energy of a photon can be calculated from its wavelength using the equation:

E = hc/λ

where h is Planck's constant, c is the speed of light, and λ is the wavelength of the photon.

Given that the wavelength of the incident radiation is 350 nm, we have:

f = c/λ = (3.00 x 10^8 m/s) / (350 x 10^-9 m) ≈ 8.57 x 10^14 Hz E = hc/λ = (6.626 x 10^-34 J s) x (3.00 x 10^8 m/s) / (350 x 10^-9 m) ≈ 1.79 eV

Therefore, the maximum kinetic energy of the emitted photoelectrons is:

KEmax = hf - ϕ = (6.626 x 10^-34 J s) x (8.57 x 10^14 Hz) - (3.0 x 1.6 x 10^-19) J ≈ 1.17 eV

a) The minimum frequency required to cause photoemission is equal to the threshold frequency:

fo = 8.9 x 10^14 Hz

Using the same equation as in part 7a), we can calculate the work function:

ϕ = hf0 = (6.626 x 10^-34 J s) x (8.9 x 10^14 Hz) ≈ 5.90 x 10^-19 J = 3.68 eV

b) i. The maximum kinetic energy of the emitted photoelectrons can be calculated using the same equation as in part 7b):

KEmax = hf - ϕ

The energy of a photon with wavelength 250 nm is:

E = hc/λ = (6.626 x 10^-34 J s) x (3.00 x 10^8 m/s) / (250 x 10^-9 m) ≈ 4.97 eV

Therefore, the maximum kinetic energy of the emitted photoelectrons is:

KEmax = hf -

The specific heat of Al is greater than that of water. Therefore, adding Al wire will increase the temperature of water in the calorimeter. While adding the Pb pellets will decrease the temperature.

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

q = m c ΔT

The specific heat of a substance is the heat energy required to increase the temperature by one degree Celsius per one gram. Higher the specific heat, higher be the rate of cooling or heating.

The heat gained by water from steel will be greater than that of Al because specific heat of steel is greater. Lead has very small specific heat and the temperature change will be smaller.

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Answer:

aluminum wire = 2.6c

steel wire = 1.5c

lead pellets = 0.8c

Explanation:

Answer:

B seismic wave

The kinetic energy of another body having three times the mass of the given object will be 108 J

Kinetic energy-In physics, the kinetic energy of an object is the energy  it has due to  motion. It is defined as the work required to accelerate a body from a given mass from rest to a specified speed.

The kinetic energy of a body is given by \(K.E= \frac{1}{2}Mv^{2}\) (first equation)

Given K.E= 36J

Now the mass of second body is m=3M

also the second body is moving with the same speed v

So kinetic energy of second body K.E₂= \(\frac{1}{2}mv^{2} =\frac{1}{2}(3M)v^{2}\)=36×3

=108J (from first equation)

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Answer:

v₀ = 3.77 [m/s]

Explanation:

This problem can be solved in a simple way by means of the following equation of kinematics.

\(y=y_{o}+v_{o}*t+\frac{1}{2}*g*t^{2}\)

where:

y - yo = 0.441 [m]

Vo = initial velocity [m/s]

g = gravity acceleration = 9.81 [m/s²]

t = time = 0.625 [s]

\(0.441 = v_{o}*(0.625)-\frac{1}{2} *9.81*(0.625)^{2} \\2.357 = v_{o}*0.625\\v_{o}=3.77[m/s]\)

Note: The sign of the acceleration is negative since the movement of the basketball player is against of the gravity acceleration.

the 55Ω resistor dissipates approximately 10.97μJ of energy as the capacitor discharges completely.

To find the energy dissipated by the 55Ω resistor, we first need to calculate the total resistance of the circuit, which is 55Ω + 150Ω = 205Ω.
Using the formula for the time constant of an RC circuit, we can find the time it takes for the capacitor to discharge completely:  τ = RC = 0.75μF * 205Ω = 153.75μs
After one time constant, the voltage across the capacitor will have decreased to approximately 36.8% of its initial value (80 V). So, the voltage across the 55Ω resistor at this point will be:
V = 80 V * 0.368 = 29.44 V

Using Ohm's Law, we can find the current flowing through the 55Ω resistor:
I = V / R = 29.44 V / 55Ω = 0.535 A

Finally, we can use the formula for energy dissipated by a resistor:  E = I^2 * R * t
where t is the time it takes for the capacitor to fully discharge, which is approximately 5 time constants (since it takes about 5 time constants for the voltage across the capacitor to decrease to less than 1% of its initial value). So:
t = 5 * τ = 768.75μs
Plugging in the values, we get:  E = (0.535 A)^2 * 55Ω * 768.75μs = 10.97μJ

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Answer:measurements: if frequency is doubled, time between flashes it cut in half

constant speed: yes because they will still be equally spaced

accelerated: no because they will not be equally space intervals

Explanation:

Gravity's acceleration is 9.8 m/s², The speed of each seat is 11.63 m/s.

Define acceleration of gravity?

Acceleration due to gravity is also acceleration, but acceleration is only concerned with the force of gravity, whereas acceleration is concerned with any force.

The acceleration due to gravity on any body is the acceleration with which the earth attracts the body towards itself as a result of the earth's gravitational field. The acceleration due to gravity is the acceleration with which a body moves towards the earth due to gravity.

The gravitational force between two objects is affected by the distance between their centres of mass, so the force of gravity on an object is smaller at the equator than at the poles. Because of this effect, gravitational acceleration is about 0.18% lower at the equator than at the poles.

given data:

diameter = 7.83 m

mass = 10 kg

distance = 3.3 m

angle = 43.5°

acceleration of gravity = 9.8 m/s²

for speed we will apply here formula that is express as

speed = √(Rg/tanθ )    ......................1

put here all value in equation 1 we get

here R = diameter /2 + mass × sin43.5

R = 7.83/2 + 10(0.463)

R= 8.545 m

speed =  √(8.545(9.8)/tan(90-43.5) )

speed = 11.63 m/s

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Answer:

This values shows a right angle triangle

Explanation:

Given;

a vector 4.0 km due East

a 3.0 km due north

the resultant vector is 5.0 km

The resultant vector can be obtained by Pythagoras theorem if the vectors form a right angle triangle.

R² = 4² + 3²

R² = 16 + 9

R² = 25

R = √25

R = 5 km    (right angle triangle proved)

Therefore, this values shows a right angle triangle

Answer:i have none but good luck also this is a learning site ;-;

Explanation:

Answer:

metal conducts heat faster than wood. which means the metal conducted heat away from your hand (or whatever it is) faster than wood.

Explanation:

just because they feel warm/cold doesn't always mean that it is warm/cold. if they both were sitting at room temp for a long time, then both will eventually reach the temp of the room. even though they are the same temp the metal will feel colder than the wood because of the thermal conductivity of the metal compared to the wood.

The different thermal conductivities of metal and plastic are important in the design of the bowl is metal conducts heat faster than Plastic. which means the metal conducted heat away from your hand (or whatever it is) faster than Plastic.

Thermal conductivity can be defined as the degree to which heat is transmitted through the cross-section of the unit of an object, where the temperature exits directly across the surface.

Electrical conductivity is a measure of how much energy (moving charge) can pass through objects under the influence of a used electric field. Thermal conductivity measures how heat (heat moving energy) can pass through objects below temperature differences.

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Answer:

I do I make a brinliest can you please can me

Answer: Conductor, semiconductor, insulator

Explanation:

Just did the quiz

The correct option is option A.

The descending order in which electrons flow easily is:

Conductor, semiconductor, insulator

The correct order for materials by their ability to allow the flow of electrons, from most easily to least easily is Conductor, semiconductor, insulator.

Conductors are generally metals, they have plenty of free electrons due to which the electron flow is easy. Also, the conduction band and valance band in a conductor overlap, so they can conduct at room temperature.

In the case of semiconductors, the band gap between the conduction band and valance band is almost 1eV, so a little energy is enough to make the flow of electrons possible

Whereas, in insulators, the band gap is quite high and electrons can not jump from the conduction band to the valence band due to which the flow of electrons is not possible.

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Height can be calculated from GPE by mgh.

Gravitational energy or gravitational potential energy is the potential energy that a massive object has due to gravity relative to another massive object. It is the potential energy associated with the gravitational field that is released when  objects fall towards each other.  Gravitational potential energy depends on several things: it depends on the mass of the object, the gravitational acceleration of the object due to the ground, and the displacement of the object from the ground. Gravitational potential energy is measured in joules (J).

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The greatest distance the person can stand from the mirror and still see their image clearly is 2.0 meters.

The far point of a person's eyes refers to the maximum distance at which they can see objects clearly without the aid of corrective lenses. If the far point is given as 2.0 m, it means that the person can see objects clearly up to a distance of 2.0 m.

To determine the greatest distance the person can stand from the mirror and still see their image clearly, we need to consider the concept of the virtual image formed by a mirror. When we look into a mirror, our eyes perceive a virtual image as if it were formed behind the mirror.

In this case, the person's eyes can focus clearly up to a distance of 2.0 m. To see their image clearly in the mirror, the person needs the virtual image formed by the mirror to be within this range.

Since the virtual image formed by a mirror is the same distance behind the mirror as the object is in front of it, the person needs to stand at a distance from the mirror equal to the maximum distance they can focus clearly.

Therefore, the greatest distance the person can stand from the mirror and still see their image clearly is 2.0 meters.

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By focusing the signal in a specific direction, a directional antenna can increase the signal strength, providing better reception and faster data speeds. Gain of an antenna can be improved by increasing its directivity

A directional antenna can be useful for mobile phones as it can increase the signal strength and provide better reception and data speeds. The gain of an antenna can be improved by increasing its directivity, by altering its length and shape, or by adding additional elements. However, it is important to note that the improvement in gain will only be in the specific direction the antenna is facing, and signals from other directions may be weakened.

A directional antenna can be useful for mobile phones, especially in areas with weak signals. By focusing the signal in a specific direction, a directional antenna can increase the signal strength, providing better reception and faster data speeds.

For example, a Yagi antenna is a common type of directional antenna that is often used to improve the signal of a cell phone in a specific direction.

The gain of an antenna can be improved by increasing its directivity, which is the measure of how much the antenna concentrates the radio waves in a specific direction. To increase the directivity, the length and shape of the antenna can be altered, or additional elements such as reflectors or directors can be added. Increasing the size of the antenna can also increase its gain, but this may not always be practical in the case of a mobile phone.

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true

Explanation:

yes because as withstand increases as the thickness of the wire increases

(A)

Potential in all resistors are same (V = V1 = V2)

(B)

I = V/R

I = 12 / (4/3)

I = 9 A

Answer:

#A

Acceleration=a

\(\\ \tt\hookrightarrow a=\dfrac{v-u}{t}=\dfrac{8}{4}=2m/s^2\)

#B

\(\\ \tt\hookrightarrow a=\dfrac{0-8}{4}=\dfrac{-8}{4}=-2m/s^2\)

Answer(s):

Solution for Practice-A:

We know that:

Solution:

Hence, the acceleration is 2 m/s for practice A.

Solution for Practice B:

We know that:

Solution:

Hence, the acceleration is -2 m/s for practice B.

Hoped this helped!

The area of the large piston required to exert a pressing force of 3600 N is 1152 cm².

F1/A1 = F2/A2

Substituting the given values, we get:

25.0 N / 8.00 cm² = 3600 N / A2

Solving for A2, we get:

A2 = (3600 N * 8.00 cm²) / 25.0 N

A2 = 1152 cm²

A piston is a component of an engine or a device that converts heat energy into mechanical work. It is typically a cylindrical or disc-shaped object that moves back and forth inside a cylinder or a chamber. The piston is usually made of a strong and durable material, such as metal or ceramic, that can withstand high pressure and temperature.

The motion of the piston is controlled by the pressure of the gas or fluid inside the cylinder. When the gas is heated, it expands and exerts pressure on the piston, causing it to move outward. This motion can be harnessed to perform work, such as turning a crankshaft in an engine. Pistons are an important part of many mechanical systems, including car engines, hydraulic systems, and pneumatic systems.

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Answer:

a. 0.204 m, b. 20.408 m

Explanation:

We know that Potential energy is given by
\(U = mgh\)

Rearranging this, we have:
\(h=U/mg\)

a. 2000 J = 2000 kgm/s²
h = 2000/(1000*10) (Taking g = 10 m/s²)
= 0.2 m
If we took g as 9.8 m/s²,
h = 0.204 m (Marginal error)

b.  200,000 J = 200,000 kgm/s²
h = 200,000/(1000*10) (Taking g = 10 m/s²)
= 20 m
If we took g as 9.8 m/s²,
h = 20.408 m

Answer:

hope this helps

Explanation:

solid particles are arranged according to the size of the object

while liquid particles are arranged how they move freely together in the object they are in.

while gas particles are arranged scatterly like they spread.

Answer: chicken nuggy

Explanation:

because chicken muggy

Answer:

3000 kg*m/s

6000 kg*m/s

Explanation:

p = m*v

p = 150kg*20m/s

p = 3000 kg*m/s

p = 150kg*40m/s

p = 6000 kg*m/s

The behavior of a wildfire is typically described by b) intensity and spread.

Wildfire behavior refers to the way the fire responds to the various factors that influence its spread and movement. The behavior of a wildfire is typically described by two main characteristics, which are intensity and spread. Intensity refers to the heat output of the fire and its potential for ignition and combustion. Spread, on the other hand, is the rate at which the fire is moving and how far it has spread. The intensity of a wildfire is influenced by several factors, including the type of fuel, weather conditions, and topography.

High-intensity wildfires tend to occur in areas with abundant and dry fuel, high temperatures, low humidity, and high winds, they can be dangerous and difficult to control, and they often result in significant damage to the environment and human communities. Spread is influenced by the same factors as intensity, as well as the presence of firebreaks, the availability of resources, and the tactics used by firefighting personnel. The speed and direction of the fire can vary greatly depending on the surrounding conditions, and it is important to monitor and assess these factors in order to manage the fire effectively. So therefore the behavior of a wildfire is typically described by b) intensity and spread.

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Answer:

m = 15, P = .25, x = .15

F = -K x for spring

ω = (K/m)^1/2

ω^2 = K / m

K = m ω^2 = m (2 π f)^2 = m 4 π^2 / P^2

K = 4  π^2 m / P^2

F = K x = x * 4  π^2 m / P^2

F = .15 * 4 * π^2 * 15 / .25^2

F = 1420 N

Answer:

Srry for the delay but this might help ppl in the future

Explanation:

PEACE OUT!