if you walk at an avaerage speed of 5 km/h for 30 min how far will you walk

Answer:

161,000 cm

Explanation:

1 mi × (1.61 km/mi) × (1000 m/km) × (100 cm/m) = 161,000 cm

The amount of heat that goes into the water is 41,860 Joules.

First we can use the formula:

Q = m x c x ΔT

where

In this case, we have:

m = 500 g (since the volume is given as 500 mL, and the density of water is approximately 1 g/mL)

c = 4.186 J/g°C (specific heat of water)

ΔT = 50°C - 30°C = 20°C (change in temperature)

Substituting these values into the formula, we get:

Q = 500 g x 4.186 J/g°C x 20°C

Q = 41,860 J

Therefore, the amount of heat that goes into the water is 41,860 Joules.

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Answer:

\(2.8\; {\rm s}\).

Explanation:

The velocity of vehicle \(2\) relative to vehicle \(1\) is:

\(\begin{aligned}& \text{velocity of 2 relative to 1} \\ =\; & (\text{velocity of 2 relative to ground}) \\ &- (\text{velocity of 1 relative to ground}) \\ =\; & 33\; {\rm m\cdot s^{-1} - 28\; {\rm m\cdot s^{-1}} \\ =\; & 5\; {\rm m\cdot s^{-1}} && (\text{to the east})\end{aligned}\).

The displacement of vehicle \(2\) relative to vehicle \(1\) is currently \(0\; {\rm m}\). The rate at which this displacement increases is equal to the velocity of vehicle \(2\!\) relative to vehicle \(1\!\), which is \(5\; {\rm m\cdot s^{-1}}\).

Thus, it would take \((14 \; {\rm m}) / (5\; {\rm m\cdot s^{-1}}) = 2.8\; {\rm s}\) for this displacement to reach \(14\; {\rm m}\).

Answer:

\(d=785.27\ g/cm^3\)

Explanation:

The question says that, "Calculate the absolute density of a fluid whose mass is 12.8 kg and which occupies a volume of 16.3 cm³".

Mass, m = 12.8 kg = 12800 g

Volume, V = 16.3 cm³

The density of an object is defined as the mass per unit volume i.e.

\(d=\dfrac{m}{V}\\\\d=\dfrac{12800}{16.3}\\\\d=785.27\ g/cm^3\)

So, the absolute density of the fluid is equal to \(785.27\ g/cm^3\).

Answer:

standard

Explanation:

we sometimes use weights of known mass to balance with an object of unknown mass to determine that objects weight.

True. As a star begins to evolve away from the main sequence, it does indeed get larger.

This stage of stellar evolution is known as the red giant phase. When a star exhausts its hydrogen fuel in its core, the core contracts and heats up while the outer layers of the star expand.

This expansion causes the star to increase in size, making it larger than its initial size during the main sequence phase. The increase in size is primarily due to the higher luminosity and the redistribution of stellar material in the outer layers.

Eventually, stars like the Sun will evolve into red giants before undergoing further changes in their evolution.

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The speed of the 6.00 kg object after the collision is 1.67 m/

Initially the 4 kg object was moving at 5.00 m/s in the east direction, and the 6 kg object was at rest.

The 4 kg object collided elastically with the 6 kg object, and after the collision, the 4 kg object started moving in the southwest direction.

Therefore, there are two components of velocity of the 4 kg object, one in the east direction and the other in the south direction, with the resultant velocity of the object being in the southwest direction.

Therefore, the speed of the 6 kg object after the collision is simply the magnitude of its velocity, which is 3.33 m/s in the east direction. Thus, the speed of the 6.00 kg object after the collision is 1.67 m/s.

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Answer:

\(\boxed {\boxed {\sf 157.5 \ Joules }}\)

Explanation:

Work is equal to the product of force and distance.

\(W=F*d\)

The box is being pushed with an effort (force) of 45 Newtons and the distance is 3.5 meters.

\(F= 45 \ N \\d= 3.5 \ m\)

Substitute the values into the formula.

\(W= 45 \ N * 3.5 \ m\)

Multiply.

\(W= 157.5 \ N*m\)

\(W= 157.5 \ J\)

157.5 Joules of work are done on the crate.

Hi there!

We can begin by calculating the acceleration using the kinematic equation:

d = vit + 1/2at²

Since the rocket starts from rest, we can rewrite this as:

d = 1/2at²

Plug in given values:

4.2 = 1/2a(0.137²) ⇒ a = 447.55 m/s²

Now, we can use Newton's Second Law to find the appropriate force:

∑F = m · a

∑F = 50,000 · 447.55 = 22,377,500 N

The power dissipated in the internal resistance of the battery is equal to the product of the current flowing through the battery and the voltage drop across the internal resistance.

Every battery has an internal resistance, which causes a voltage drop when current flows through the battery. This voltage drop results in a loss of energy in the form of heat, which is known as the power dissipation in the internal resistance of the battery.

The amount of power dissipated in the internal resistance is directly proportional to the current flowing through the battery and the internal resistance. The higher the current and internal resistance, the more power is dissipated, which can reduce the overall efficiency of the battery and shorten its lifespan.

To maximize the efficiency of a battery, it is important to minimize its internal resistance and choose a battery with low internal resistance.

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Answer:

the answer is letter A im not sure

Vernier calipers have a resolution of 1/10 of an inch.

To determine the diameter of circular objects, a vernier caliper is typically employed. The vernier caliper's elongated jaws can precisely measure the circumference of rounded objects.

A vernier caliper has two scales: a moving vernier scale in addition to the primary, fixed scale. The primary scale displays millimeter readings.

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To determine the amount of energy lost due to air resistance, we can use the principle of conservation of mechanical energy. Initially, the Snickers bar has gravitational potential energy, and upon hitting the ground, it has kinetic energy.

The gravitational potential energy (PE) of an object is given by the equation:

PE = m * g * h

Where:

m is the mass of the object (3 kg)

g is the acceleration due to gravity (approximately 9.8 m/s^2)

h is the height of the Washington Monument (170 m)

Calculating the potential energy, we have:

PE = 3 kg * 9.8 m/s^2 * 170 m

PE = 4998 J (joules)

At the moment of impact, all the potential energy is converted into kinetic energy, given by:

KE = 1/2 * m * v^2

Where:

m is the mass of the object (3 kg)

v is the velocity at impact (52 m/s)

Calculating the kinetic energy, we have:

KE = 1/2 * 3 kg * (52 m/s)^2

KE = 4056 J (joules)

The energy lost due to air resistance is the difference between the initial potential energy and the final kinetic energy:

Energy Lost = PE - KE

Energy Lost = 4998 J - 4056 J

Energy Lost = 942 J (joules)

Therefore, the amount of energy lost due to air resistance is 942 joules.

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The bicycle will experience more force.

Force is the intensity by which an object is pushed or pulled.

Let the mass of the pedestrian = M kg

Let the mass of bicycle = m kg

Also M > m

The more the mass the more will be the force exerted on the opposite object.

Therefore the bicycle will experience more force when both of them collided in the street.

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Answer:

Temporary? You have two options

If you have a positively charged object, bring it close to the LEFT side of the ball (not touching it!).

If you have a negatively charged object, bring it close to the RIGHT side of the ball (again, not in contact).

Either way, the electron cloud will migrate towards the right side of the of your sphere.

Another option is to have a capacitor large enough to house the sphere inside it, and polarize it by attaching it to a DC source making sure that the negative plate of it is to the right of the sphere.

Frictional force and normal force are directly proportional. When the normal force increases, the frictional force also increases, as seen when pushing a heavy box.

Frictional force is proportional to the normal force. This means that as the normal force increases, the frictional force also increases, and vice versa.

For example, let's consider a person pushing a heavy box along the floor. The weight of the box creates a normal force, which is the force exerted by the floor on the box in the upward direction. The frictional force between the box and the floor acts in the opposite direction to the motion.

If the person pushes the box with a constant force, the frictional force will be directly proportional to the normal force. If the weight of the box is doubled, the normal force will also double, resulting in a doubling of the frictional force. Similarly, if the weight of the box is halved, the normal force and frictional force will both decrease by half

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(a) The minimum speed, the object must have in order to make it to point B is 6.26 m/s.

(b) If the initial speed is 12 m/s, the final speed of the object at point A is 8.1 m/s and point B is 10.23 m/s

The minimum speed of the object in order to reach point B is calculated by applying the principle of conservation of energy as shown below.

K.E₁ + P.E₁ = K.E₂ + P.E₂

K.E₂ - K.E₁ = P.E₁ - P.E₂

where;

¹/₂m(v₂² - v₁²) = mg(h₁ - h₂)

¹/₂(v₂² - v₁²) = g(h₁ - h₂)

v₂² - v₁² = 2g(h₁ - h₂)

v₂² = 2g(h₁ - h₂) + v₁²

where;

v₂ = √ [2g(h₁ - h₂) + v₁² ]

v₂ = √ [2 x 9.8(4 - 2) + 0² ]

v₂ = 6.26 m/s

B.

When the initial speed is 12 m/s, the final speed at A is calculated as;

v₂ = √ [2 x 9.8(0 - 4) +  12² ]

v₂ = 8.1 m/s

The final speed at B is calculated as;

v₂ = √ [2 x 9.8(4 - 2) +  8.1² ]

v₂ = 10.23 m/s

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if the plates of a parallel plate capacitor are separated by 0.1mm of bakelite dielectric, and the bakelite has a dielectric constant of 4.9 and the plates area 0.0049m^2, the capacitance is 2.126nF

What is capacitance?

It is the ability of a component or circuit to collect and store energy in the form of an electrical charge. Capacitors are energy-storing devices available in many sizes and shapes.

The formula of capacitance of the capacitors is with dielectric constant as follows :
C = Kε₀A / D

where
C = Capacitance

k = dielectric constant

ε₀ = permittivity free space

d = distance between the plate

A = area between the plate

we are using this formula because it said parallel plate capacitor.

from the question given as follows :
k = 4.9 (dielectric constant)

d = 0.1mm = 1 * 10^-8 m^2

A = 0.0049m^2

ε₀ = 8.854 * 10^-12 F/m (from literature, permittivity of the free space)

C = 4.9 * 8.854*10^-12 * 0.0049 / 1 * 10^-8

C = 0.000021258454

C = 2,125.845 * 10^-12 F

C = 2.125845 * 10^-9 F

C = 2.126nF (rounded)

Therefore, the capacitance is 2.126nF for the plates.

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Answer:

Jupiter

Explanation:

Jupiter is the largest planet in our solar system and is about 11 times larger than earth.

When a wire is carrying current, charges enter the wire at the positive terminal of the voltage source and exit at the negative terminal, keeping the overall charge at zero throughout the current's passage.

Charge moving across a conductor produces current. There is always the same number of electrons in a wire today. As a result of an equal amount of electrons entering and exiting the circuit simultaneously, current flows through the wire when electrons enter the circuit. Current flow may nevertheless be neutral with no overall charge.

Neutral wires do indeed carry current. In single-phase circuits, the current flows in the opposite direction from the "phase" or "line" or "hot" wire, but it is exactly equal to that current. Out of "line," into "neutral," back into "line," and finally back into "neutral" and back into "line" (since it is AC the direction reverses every cycle.)

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Answer:

Approximately \(705\; {\rm m}\).

Explanation:

Let \(x\) denote the distance travelled before the plane takes off.

Let \(u\) denote the initial velocity of the plane, and let \(v\) denote the velocity of the plane when it takes off. It is given that the takeoff speed is \(v = 65\; {\rm m\cdot s^{-1}}\). Assuming that the plane was initially stationary, initial velocity would be \(u = 0\; {\rm m\cdot s^{-1}}\).

It is given that the acceleration of the plane would be \(a = 3\; {\rm m\cdot s^{-2}}\).

Since acceleration is constant, apply the SUVAT equation \(x = (v^{2} - u^{2}) / (2\, a)\) to find the value of \(x\):

\(\begin{aligned} x &= \frac{v^{2} - u^{2}}{2\, a} \\ &= \frac{(65)^{2} - (0)^{2}}{2\, (3)}\; {\rm m} \\ &\approx 705\; {\rm m}\end{aligned}\).

(Rounded up.)

Hence, the length of the runway should be at least \(705\; {\rm m}\).

Answer:

Radio Waves

Explanation:

Answer:

In physics, power is the amount of energy transferred or converted per unit time. In the ... Power (physics) ... Angular acceleration / displacement / frequency / velocity. show. Scientists ... Hence the formula is valid for any general situation. ... because they define the maximum performance of a device in terms of velocity ratios

Explanation:

A tropical cyclone is assigned a name when it reaches tropical storm strength, which is equivalent to a sustained wind speed of 39 mph or higher.

This is the stage when it is officially classified as a tropical storm. If a storm strengthens further to become a hurricane, the same name will remain. A name is typically assigned to a tropical cyclone at the tropical storm stage. This is when the system has developed sustained winds of 39 to 73 miles per hour (63 to 118 kilometers per hour) and has a defined circulation, according to the National Hurricane Center. Once a tropical storm is named, it is tracked and monitored by meteorologists using its assigned name.

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Answer:

Graph-

Explanation:

The graph best shows the velocity v of the clay ball from when it is dropped until it hits the ground is attached below.

Velocity is the time rate of change of displacement. The displacement and velocity both are vector quantities. They represent magnitude and direction as well.

Irene drops a clay ball at time t=0. The ball stops when it hits the ground.

When the clay ball drops, only force acting is due to acceleration due to gravity.

The velocity of the clay ball decreases with the time.

Thus, the graph best shows the velocity v of the clay ball from when it is dropped until it hits the ground is attached.

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Answer:

"Scientist use radioactive decay to measure the age of a rock or fossil."

Explanation:

"To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events."

The particle would have the longest De Broglie wavelength traveling with the same velocity, which has lesser frequency.

What is wavelength?

The wavelength is the distance between the adjacent crest or trough of the sinusoidal wave. The wavelength is the reciprocal of the frequency of the wave.

Wavelength λ = c/f

where c is the speed of light in vacuum = 3*10⁸ m/s

As, the wavelength and frequency are inversely related to each other. When the wavelength is longer, the frequency will be lesser to the same value of speed of wave.

Thus, the particle with less frequency has longest De Broglie wavelength.

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