The graph shows the angular velocity 0; and angular acceleration a, versus time for a rotating body. At which of the following times is the rotation slowing down? A. t=1s B.1=2 s Cr=35 D. =4s E. 1= 5 s

Explanation:

Sound travels from the tour guide to the other of the canyon and then back, thus hearing the echo. The time of 2.0 s represents the time it takes the sound to make a round trip, therefore it takes 1.0 s for the tour guide's voice to reach the other side of the canyon. At 20°C, the speed of sound is 343 m/s therefore the width of the canyon is

\(x = vt = (343\:m/s)(1.0\:s) = 343\:m\)

The canyon in the given question is 340 m wide.

Echo is a reflection of sound that comes to the listener after the direct sound, but with a delay. The delay is inversely proportional to the separation between the source and the listener of the reflecting surface.

To hear the echo, the following conditions must be met:

There must be a minimum of 17 meters between the sound source and the reflecting surface, and there must be at least 0.1 seconds between the original sound and its echo.

Given parameters:

When a tour guide shouts across a canyon, her echo is heard 2.00 s later. That means, in two seconds the sound goes to other wall of canyon and reflected back.

At a temperature of 20 °C, velocity of sound is 340 m/s.

So, the wide is the canyon be = velocity of sound × time/2

= 340 m/s ×2 s/2s = 340 m.

Hence, the wide is the canyon be 340 m.

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A coin falls off a table and is traveling to the ground. There is a net force on the coin which is responsible for the motion of the coin. Thus, the correct option is A.

The net force can be defined as is the sum of all the forces which are acting on an object. Net force acting upon an object can accelerate its mass. Some other forces also acts on a body either at rest or motion. The net force is used in a system when there is a significant number of forces acting on the object.

A coin which falls off a table and is still traveling to the ground. Then, it can be concluded that there is a net force which is acting on that coin which is responsible for the motion of the coin.

Therefore, the correct option is A.

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The density of a typical laboratory plasma is 1018 m-3, this value leads to plasma oscillations at 9 x 10⁹ Hz.

The density of an object is defined as the measurement of how tightly a material is packed together.

It is also defined as the mass per unit volume and its unit is kilogram per meter cube.

Density = mass / volume

f = 9(n)^0.5

where;

n is density = 10¹⁸

f = 9(10¹⁸)^0.5

f = 9(10⁹) Hz

f = 9 x 10⁹ Hz

Thus, if the density of a typical laboratory plasma is 1018 m-3, this value leads to plasma oscillations at 9 x 10⁹ Hz.

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Answer:

what is it about

Explanation:

Answer:

Note: These answers are based off of sense and educational quessing, as I cannot do the experiment.

Question 1:

The balloons did not balance.

Question 2:

The bigger balloon tipped the scale down.

Question 3:

Yes, it validated that gas does has mass, as the bigger balloon weighed down the scale.

Question 4:

N/A

Answer:

The kinetic energy decreases.

Explanation:

Friction is defined as a opposite force to motion. If friction is the only force acting on an objects, its kinetic energy decreases.

It is so because due to resistive force or friction, kinetic energy is converted to heat energy and that reduces the total kinetic energy in the system.

Hence, the correct answer is "The kinetic energy decreases."

The assumptions must be made base in the object’s kinetic energy in a situation whereby frictional force is the only force acting on an object is A:The kinetic energy decreases.

Therefore, option A is correct.

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If a vertical spring, with a spring constant of 875 n/m, is coupled to a table and compressed down down 0.160 m, the ball will fly at a speed of 18.2 m/s, which is high well above initial location.

The "spring constant," or "k," is a quantity that effectively indicates how "stiff" a spring is. It is represented by the letter "k." A greater value of k indicates that more force must be applied to extend it a given distance than would be necessary to stretch a spring with a lower stiffness a similar distance.

According to Hooke's Law, the force applied when a spring is extended is proportional to a length increase above the equilibrium length.  The spring constant, k, is equal to -F/x.

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For saving lives  the most important safety feature on a car is B. Safety Belt

Safety features of  a car is a feature of a product designed to ensure or increase safety.

Air bag and Anti-lock brakes are the supplemental protection and designed to work best with combination with seat bells.

Air bag reduce the chance that upper body or head will strike the vehicle's interior during a crash alongside with belt that will  also hold your upper body

so, the primary safety feature is seat belt and Air bag and Anti-lock brakes  comes in secondary safety feature  as they increases the safety and risk of getting an injury during any accident

correct answer is B. Safety Belt

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Answer:

Explanation:

This is quite tricky! You need to do 2 different equations to solve all the parts of this problem. First is finding the acceleration in one dimension, which has an equation of

F - f = ma

where F is the applied Friction,

f is the frictional force acting against F,

m is the mass of the object, and

a is the acceleration of the object (NOT the velocity!)

This is Newton's Second Law expanded on a bit. The sum of the forces working on an object is equal to the object's mass times its acceleration. We have F, but we need f which is found in the equation

f = μ\(F_n\) which is the coefficient of kinetic friction times the weight of the object. Weight is found in the equation

w = mg where m is mass and g is the pull of gravity. Let's start there and work backwards:

w = 37(9.8) to 2 sig figs so

w = 360N. Now fill that in to find f:

f = (.17)(360) to 2 sig figs so

f = 61. Now for the final answer in the original equation way back up at the top:

85 - 61 = 37a and do the subtraction on the left side first:

24 = 37a and then we divide to 2 sig figs to get

a = .65 m/s/s

Since we are moving in a straight line (as opposed to on an angle) the displacement is found in

d = rt which simply says that the distance an object moves is equal to its rate times the time. Therefore,

d = 2.2(3.4) to 2 sig figs so

d = 7.5 m

The major characteristic an organic compound has which an inorganic

compound doesn't  have is the presence of carbon atoms in the molecule.

This helps us to differentiate the compounds into their respective divisions.

Inorganic compounds

Organic compounds

We can observe that inorganic compounds lack carbon atoms which makes

the answer valid.

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Answer:

B and E because yk thats the asnwer

80m/s an expression of the maximum height and the velocity before hitting the ground

By third equation of motion

v 2 −u 2 =2gs

0−40

2 =−2×10×s

s= 20/160⇒s=80m/s

A stone hurled vertically upward will not travel at a steady speed. It will gradually get smaller until it is zero. Gravity tries to pull the stone down when it is hurled vertically upward, slowing down its motion.

The stone's velocity briefly hits zero as it reaches its highest point, and it then immediately begins to fall back toward the earth. The stone may thus ascend no higher than 80 metres.

When the input angle is 90 degrees, the sine function has an output value of 1, which is its maximum. In other words, when a projectile is released at an angle, it goes the farthest.

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Silver

Take a look at the chart attached for most conductive

Answer:

Initial: bring ek, eg and ech all to 2, in the end bring ek, eg up to 3 each

Explanation:

The initial state of the ball, the effect the ball might have on the Earth, and the balls final state. Ek stands for kinetic energy, Eg stands for gravitational potential energy, and Ech stands for chemical change (stored energy in food/fuel), Eint stands for internal energy change.

Kinetic energy is the type of energy present in a body due to the property of its motion and potential energy is the kind of energy present in a body due to the property of its state.

Kinetic energy can be easily transferred from one body to another but potential energy is not transferable. Kinetic energy is relative with respect to nature and potential energy is non-relative with respect to nature.

As the ball is rolling down a ramp, its potential energy decreases and kinetic energy increases.  The ball has the maximum potential energy when it is at the top, and this potential energy is transformed into both translational and rotational kinetic energy as it rolls down.

When the ball is at the topmost height, its gravitational potential energy is maximum and zero kinetic energy. When a ball reaches the bottom of the ramp, it will have zero potential energy and maximum kinetic energy.

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Three alpha particles are lost.

The process by which unstable nuclei emit radiation and lose energy  is called radioactive decay. If a material contains an unstable core, it is considered radioactive.

There are three basic types of radioactive decay, Decay of alpha, beta and gamma. Radioactivity can be measured by counting decays per second.

Explanation:

Six protons are lost when atomic number 88 decays to atomic number 82.

The following explains whether the radioactive decay process leads to the loss of six protons.

1. One Alpha and  one beta particles: Alpha particles have two protons and beta particles have one electron. So this is not a loss of 6 protons.

2. Three alpha particles: Alpha particles have two protons. So when 3 alpha particles decay, 6 protons are lost.

3. One Alpha particle: An alpha particle has two protons, so six protons are never lost.

4. Six Beta Particles: A beta particle has 1 electron, therefore 6 protons will be gained during the decay.

Therefore, three alpha particles is correct because when three of them are lost, six protons are lost.

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There are approximately 134.7 slits per centimeter in the grating.

We will use the grating equation to find the number of slits per centimeter in the grating. Here's a step-by-step explanation:

1. Recall the grating equation: nλ = d sin(θ), where n is the order of the bright fringe, λ is the wavelength, d is the distance between slits, and θ is the angle of the bright fringe with respect to the normal.

2. In this problem, we are given the following information:
  - Wavelength (λ) = 650 nm
  - Angle with respect to the normal (θ) = 5°
  - The first bright fringe (n = 1, since we are excluding the central fringe)

3. Plug the given values into the grating equation:
  1 * (650 nm) = d * sin(5°)

4. Solve for the distance between slits (d):
  d = (650 nm) / sin(5°)
  d ≈ 7422.57 nm

5. Convert the distance between slits to the number of slits per centimeter (1 cm = 1,000,000 nm):
  Number of slits per centimeter = 1,000,000 nm/cm / 7422.57 nm/slit
  Number of slits per centimeter ≈ 134.7 slits/cm

So, there are approximately 134.7 slits per centimeter in the grating.

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Answer:

See below

Explanation:

acceleration = change in velocity / change in time

  Or      F = m * a

      So the first one   Accel = 40 m/s / 20 s = 2 m/s^2

   Or    100 N = 50 * a     A = 2 m/s^2       Same answer two different ways...

The others are similar ......

Answer:

3 m/s

Explanation:

Average Speed = \(\frac{Total Distance}{Total time}\)

Plug in the numbers, it will be (6m + 3m) divided by (2s + 1s), which is 9m/3s, which equals to 3m/s.

When an object is moved closer to the concave mirror, then

a)magnitude of image distance increases.

b)the image height become larger.

In concave mirror, we know that when an object is placed at the focus, its image will formed in enlarged size at infinity, it means height of image is large as compared to height of object. Here the scenario is same when object is placed at the center of curvature, object formed at the center of curvature of mirror in opposite direction of object. When object is moved closer to mirror from the center of curvature, image starts moving away from the mirror.

Image will formed below the positive y-axis and nature of image will be inverted and size of image starts increasing when it moves closer to mirror.

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Answer:

Well, I know basketball is one. Also, Track and Field and tennis

A system's isolated thermal energy fluctuates throughout time. According to the first law of thermodynamics, which states that a system's thermal energy can fluctuate even if its overall energy remains constant if the mechanical energy of that system is constant.

Thermal energy is the internal energy that a system has when it is in thermodynamic equilibrium due to temperature. The energy of systems that are not in a state of thermodynamic equilibrium cannot be transformed into useful work as easily as thermal energy.

The same fluid or solid in a thermodynamic equilibrium state with the same energy (as thermal energy), however, cannot do work unless it is combined with another substance at a different temperature, as in a heat engine. This is because the same fluid or solid in a thermodynamic equilibrium state has the same energy (as thermal energy), but it cannot be converted to work in a mechanical device.

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The type of asteroid that would appear darkest and reflect the least light is type option E) S.

Among the given options, type E) S asteroids would appear darkest and reflect the least amount of light. Asteroids are classified into different types based on their composition, and type S asteroids belong to the silicate group. They are made up of rocky materials, such as silicates and metals, and they tend to have a relatively low albedo.

Albedo refers to the amount of light an object reflects, and a low albedo means that the object absorbs more light than it reflects. As a result, type S asteroids appear darker because they absorb a significant portion of the incident light rather than reflecting it. Their dark appearance is due to their composition and surface properties.

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In the peak of summer, it hasn't rained in a week, and the plants are looking rough, so watering the plants for an hour is a good idea.

However, the next day, you come back to the garden, and the plants look in worse shape than they did previously, as if none of that water made it to the plant. Plants absorb water through their roots. The root system of a plant is responsible for drawing water and nutrients from the soil. A plant's root system must be able to absorb water quickly in order for the plant to grow and thrive. When the soil around the root system is dry, the roots will stop growing and will not be able to absorb water.

It may even start to die. Watering plants during the peak of summer is important because it will help keep the soil moist and prevent the roots from drying out. However, watering a plant too much can be harmful. If a plant is overwatered, the water may not be able to penetrate the soil and reach the roots. Instead, it may just sit on top of the soil, causing the roots to rot and die. This can cause the plant to wilt and die.To summarize, if the soil around the plant is too dry, the roots may not be able to absorb the water you gave them, causing the plant to look worse than before. Conversely, overwatering can also be harmful because the water may not be able to penetrate the soil and reach the roots, causing the roots to rot and die.

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Answer:

\(\boxed {\boxed {\sf 15 \ m/s^2 \ to \ the \ right}}\)

Explanation:

We are asked to find the acceleration of a box.

According to Newton's Second Law of Motion, force is the product of mass and acceleration.

\(F=ma\)

The mass of the box is 5 kilograms. There are two forces applied: a 25 Newton force and a 50 Newton force, both applied right. Since they are applied in the same direction, we can add them.

Now we know 2 of the variables in the formula:

Substitute the values into the formula.

\(75 \ kg*m/s^2 = 5 \ kg *a\)

We are solving for a, so we must isolate the variable. It is being multiplied by 5 kilograms. The inverse operation of multiplication is division. Divide both sides by 5 kg.

\(\frac {75 \ kg*m/s^2}{5 \ kg}= \frac {5 \ kg *a}{5 \ kg}\)

\(\frac {75 \ kg*m/s^2}{5 \ kg}=a\)

The units of kilograms cancel.

\(\frac {75 m/s^2}{5}=a\)

\(15 \ m/s^2 =a\)

The acceleration is in the same direction as the force, so the acceleration is 15 meters per second squared to the right.

\(\\ \rm\bull\rightarrowtail Displacement=Velocity\times Time\)

\(\\ \rm\bull\rightarrowtail Displacement=8(14)\)

\(\\ \rm\bull\rightarrowtail Displacement =112m\)

The voltage drop across the 30Ω resistor in the given circuit is 60V which is described below.

According to the circuit given in the question, all the resistors are connected in series with the battery.

The equivalent resistance R in the circuit is:

R =  10Ω + 20Ω + 30Ω

R = 60Ω

The battery has a voltage of V = 120V

From Ohm's Law:

V = IR

where I is the current in the circuit

120 = I × 60

I = 2A

So, the same current flows through all the resistors as they are connected in series.

The voltage drop across 30Ω resistor is:

V₃₀ = 2×30

V₃₀ = 60 V

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His velocity and rate of displacement will be affected by increasing his acceleration because as his speed rises as a result of his higher rate of acceleration, so does the rate at which air resistance rises.

Air exerts a force known as air resistance. The force acts in the opposite direction when anything is in motion through the air.

The force of air resistance works to balance the pull of gravity as a diver descends. The amount of air resistance increases as the skydiver descends faster and faster until it reaches a point where it is equivalent to the force of gravity.

When the forces of gravity and air resistance are equal, the skydiver has reached a state of equilibrium and is no longer accelerating. At this point, the skydiver reaches terminal velocity.

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Answer:

i have no idea

Explanation:

The system described by the transfer function G(s) = -co² s² + 2a + w², with a damping ratio of 1.3 and a natural frequency of 0.5, has an overdamped unit step response. So, the correct option is (E)

The transfer function of the system is given as G(s) = -co² s² + 2a + w², where co represents the damping ratio, a represents an arbitrary constant, and w represents the natural frequency of the system. We are given that the natural frequency is 0.5 and the damping ratio is 1.3.

To determine the type of unit step response, we need to analyze the damping ratio (co) in relation to the critical damping value (co_critical).

The critical damping ratio (co_critical) is defined as the value where the system is on the threshold between being overdamped and underdamped. It is given by the formula co_critical = 2 * sqrt(a * w²).

In our case, the natural frequency (w) is 0.5, so we can calculate co_critical as follows: co_critical = 2 * sqrt(a * 0.5²).

Since the damping ratio (co) is given as 1.3, we can compare it with co_critical to determine the type of unit step response.

If co > co_critical, the system is considered overdamped (Option E).

If co = co_critical, the system is considered critically damped (Option D).

If co < co_critical, the system is considered underdamped (Option C).

Based on the given values, we can determine that the system is overdamped (Option E) because the damping ratio (1.3) is greater than the critical damping ratio.

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