dry ice (carbon dioxide) changes from a solid to a gas at –78.5°c. what is this temperature in °f?

Answer:

The correct option is;

-Pointing the fan exhaust upward

Explanation:

The fan cart transfers reaction force from the jet of air it blows through the exhaust into motion in the opposite direction of the jet. By pointing the fan exhaust upwards, the direction of motion of the cart is therefore, into the ground. Due to the solid nature of the ground the motion is resisted, and by Newton's first law of motion, a body will remain in motion unless resisted by a force. In the case of the question, the ground is resisting the motion of the cart and the cart will remain at rest and having zero acceleration.

Answer:

C. the velocity

Explanation:

Answer:

1.) As rocket mass increases, acceleration decreases

2.) The inverse of the mass of the boat

3.) Zero

4.) When the velocity increases

5.) It increases

Explanation:

took the test, all were correct

Answer:

mass = GPE divided by gxh

Explanation:

Answer:

69.9 kg

Explanation:

w = mg

m = w/g

m = 685/9.8

m = 69.9 kg

The friction force that is exerted on the car's rotating wheels causes an imbalanced force to be applied to the vehicle, which then accelerates. The center of the circle the car is turning is the target of both the unbalanced force and the acceleration. Your body, however, continues to move and is in motion.

An object's motion may vary if an imbalanced force is applied to it. The small car will alter speed, direction, or even halt if a heavier, faster toy car moves into its path or along its side. The small toy car is being subjected to a stronger force, which is why its motion has changed.

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13.The color with the longest wavelength is option A. Red.

14.The sky appears blue due to option D. Scattering of light.

Red light has a longer wavelength compared to yellow and blue light.The color that has the longest wavelength is red. The color of the sky appears blue due to scattering of light. The distance between one peak and the next in a series of waves, particularly electromagnetic waves traveling through space or along a wire is referred to as wavelength.

The wavelength of light, for example, determines its color. Red light has the longest wavelength, followed by orange, yellow, green, blue, and purple, with violet light having the shortest wavelength. When light is reflected off a surface or passes through a medium, it can be deflected in various directions, a phenomenon known as scattering of light.

The Earth's atmosphere scatters sunlight in all directions, but the shorter blue wavelengths are scattered more than the longer wavelengths. As a result, we perceive the sky as blue during the day.  The light becomes scattered when it interacts with particles in the atmosphere, causing the sky to appear blue during the day and red during sunset or sunrise. The scattering of light is the process that causes the sky to appear blue.

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Explanation:

Vector, in physics, a quantity that has both magnitude and direction. It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity's magnitude.

Answer:

To calculate the mass of the electron traveling at 0.85c, we can use the formula for relativistic mass:

m = m0 / sqrt(1 - v^2/c^2)

Where:

m0 = rest mass

v = velocity of the electron

c = speed of light

Substituting the given values, we get:

m = (9.11 x 10^-31 kg) / sqrt(1 - (0.85c)^2/c^2)

Simplifying this expression:

m = (9.11 x 10^-31 kg) / sqrt(1 - 0.7225)

m = (9.11 x 10^-31 kg) / sqrt(0.2775)

m = (9.11 x 10^-31 kg) / 0.5266

m = 1.730 x 10^-30 kg

Therefore, the mass of the electron traveling at 0.85c is 1.730 x 10^-30 kg.

Explanation:

0.6 m long would a pipe, open at both ends, need to be to play the same fundamental frequency .

What is frequency ?

Frequency, in physics, the number of waves passing through a fixed point in a unit of time. Also, the number of cycles or oscillations per unit time experienced by an object in periodic motion. An object in periodic motion is said to undergo a cycle or oscillation after returning to its original state through a series of events or positions. See also angular velocity. A simple harmonious movement.

If the period or time interval required to complete a cycle or oscillation is 0.5 seconds, the frequency is 2 times per second. If the period is 1/100 hour, the frequency is 100 per hour. In general, frequency is the reciprocal of duration or time interval. That is, frequency = 1/duration = 1/(time interval). The frequency of the moon's orbit around the earth is just over 12 cycles per year. His A string on the violin has a frequency of 440 vibrations or cycles per second.

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Answer:

reacts to mos metlal

Explanation:

Answer:The equation is balanced for both charge and nucleon number, as required.

Explanation:2713Al + 42He → 3015P + n

Answer:

ΔU = 5.21 × 10^(10) J

Explanation:

We are given;

Mass of object; m = 1040 kg

To solve this, we will use the formula for potential energy which is;

U = -GMm/r

But we are told we want to move the object from the Earth's surface to an altitude four times the Earth's radius.

Thus;

ΔU = -GMm((1/r_f) - (1/r_i))

Where;

M is mass of earth = 5.98 × 10^(24) kg

r_f is final radius

r_i is initial radius

G is gravitational constant = 6.67 × 10^(-11) N.m²/kg²

Since, it's moving to altitude four times the Earth's radius, it means that;

r_i = R_e

r_f = R_e + 4R_e = 5R_e

Where R_e is radius of earth = 6371 × 10³ m

Thus;

ΔU = -6.67 × 10^(-11) × 5.98 × 10^(24)

× 1040((1/(5 × 6371 × 10³)) - (1/(6371 × 10³))

ΔU = 5.21 × 10^(10) J

Answer:

6 kilograms

Explanation:

force (N) = mass (kg) × acceleration (m/s²).  an object of constant mass accelerates in proportion to the force applied. If the same force is applied to two objects of different mass, the heavier object has less acceleration than the lighter object. Divide the newtons by the rate of acceleration, which will give you the mass of the object. The mass will be in kilograms, because a single newton represents the amount of force needed to move one kilogram one meter.

Answer:

Use v = u + at but since u is equal to zero then it becomes v = at. The final velocity of the body is equal to 12 m/s. The acceleration of an object decreases ...

Explanation:

1.5m/s2

F=ma

a=F/m

a=60/40

a=1.5m/s2

The acceleration of the cart is 1.5 meter per seconds square.

Given the following data:

To find the acceleration of the cart, we would use Newton's Second Law of Motion.

Mathematically, Newton's Second Law of Motion is given by the formula;

\(Acceleration = \frac{Net\; Force}{Mass}\)

Substituting the given parameters into the formula, we have;

\(Acceleration = \frac{60}{40}\)

Acceleration = 1.5 meter per seconds square.

Therefore, the cart's acceleration is 1.5 meter per seconds square.

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The correct answer is ○ 8.91.

The critical angle for an air-glass interface is the angle of incidence at which the refracted ray is at 90 degrees to the surface, meaning the angle of refraction is 90 degrees.

However, if the angle of incidence is greater than the critical angle, then total internal reflection occurs and no refracted ray is formed.

In this scenario, the reflected ray is 100 percent polarized, which means that it vibrates in only one plane.

The angle of refraction can be determined using Snell's Law, which states that n1sinθ1 = n2sinθ2,

where n1 and n2 are the refractive indices of the media on either side of the interface and θ1 and θ2 are the angles of incidence and refraction, respectively.

Since the incident ray is in air and the interface is with glass, we can assume that n1 = 1 and n2 = 1.5. Using Snell's Law, we can find the angle of refraction to be closest to 8.91 degrees.

Therefore, the answer is ○ 8.91.

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The difference between the acceleration of his head and feet is 27.745 m/s².

Acceleration of an object is the rate of change of the velocity of an object with respect to the time taken. Acceleration is a vector quantity. The orientation of an object's acceleration is given by the orientation of the net force which is acting on that object.

a. The center seeking acceleration of a body is known as centripetal acceleration. The expression is given as,

a = v²/ r

v = \(\sqrt{ar}\)

v = \(\sqrt{12.5g X 8.84}\)

v = \(\sqrt{12.5g X 9.8 X 8.84}\)

v = 32.92 m/s

Thus, the maximum speed of the astronaut's head is 32.92 m/s.

b. With difference in length between the head and feet, the new length is,

r' = 8.84 - 2.00 = 6.84 m

Then the difference in acceleration is,

a' = a - a''

a'' is the acceleration of astronaut. And its value is,

a'' = ω² × r'

a'' = a/r × r'

a'' = (12.5g/ 8.84) × 6.84

a'' = (12.5×9.8/ 8.84) × 6.84

a'' = 94.88 m/s²

Then, the difference in acceleration is,

a' = 12.5g - 94.88

a' = 12.5×9.8 - 94.88

a' = 27.745 m/s²

Thus, the required difference between the acceleration of the head and the feet of astronaut is 27.745 m/s².

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Your question is incomplete, most probably the complete question is:

At its Ames Research Center, NASA uses its large 20-G centrifuge to test the effects of very large accelerations (hypergravity) on test pilots and astronauts. In this device, an arm 8.84 m long rotates about one end in a horizontal plane, and the astronaut is strapped in at the other end. Suppose that he is aligned along the arm with his head at the outermost end. The maximum sustained acceleration to which humans are subjected in this machine is typically 12.5 g .Part A How fast must the astronaut's head be moving to experience this maximum acceleration?Part B What is the difference between the acceleration of his head and feet if the astronaut is 2.00 m tall?

Explanation:

The energy of a wave is given by :

\(E=\dfrac{hc}{\lambda}\)

Where

h is Planck's constant

c is the speed of light

\(\lambda\) is wavelength

Energy is inversely proportional to wavelength. Also, the relation between frequency and wavelength is inverse.

If the frequency is high, the wavelength will be shorter.

Hence, the correct options are :

Higher frequencies have shorter wavelengths.

Shorter wavelengths have lower energy.

Lower frequencies have lower energy.

The pasta and pot can be referred to as a Solid while the water is a liquid

when their physical forms are compared.

The pot is usually a metal because of its high heat conductivity and the

pasta is usually made from organic materials such as wheat, starch etc.

The water on the other hand should be colorless and odorless to avoid

ingesting pathogens.

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The angular momentum of a rotating turntable with initial angular speed 9.8 rad/s and mass 24 kg, changes when a clay mass of 9.3 kg is dropped and sticks at a point 1.8 m away. The final angular speed of the turntable and clay together is 8.11 rad/s.

We can use the conservation of angular momentum to solve this problem. Initially, the turntable is rotating with an angular speed of 9.8 rad/s, and after the clay is dropped, the angular momentum of the system is conserved.

The initial angular momentum of the turntable is

L1 = I1 * ω1

where I1 is the moment of inertia of the turntable and ω1 is the initial angular speed. The moment of inertia of a thin cylindrical disk is given by

I1 = (1/2) * M * R²

where M is the mass of the turntable and R is its radius. Substituting the given values, we get

I1 = (1/2) * 24 kg * (3.1 m)² = 114.48 kg m²

Therefore,

L1 = 114.48 kg m² * 9.8 rad/s = 1123.90 kg m²/s

After the clay is dropped, the system consists of the turntable and the clay rotating together.

The moment of inertia of the system can be found using the parallel axis theorem, which states that the moment of inertia of a body rotating about an axis is equal to the moment of inertia of the body about its center of mass plus the product of its mass and the square of the distance between the two axes

I2 = I1 + M * d²

where d is the distance between the point of rotation and the point where the clay sticks. Substituting the given values, we get

I2 = 114.48 kg m² + 9.3 kg * (1.8 m)² = 138.58 kg m²

The final angular speed of the system can be found by equating the initial and final angular momentum

L1 = L2

where L2 is the final angular momentum of the system. The final angular momentum of the system is

L2 = I2 * ω2

where ω2 is the final angular speed of the system. Solving for ω2, we get

ω2 = L1 / I2 = 1123.90 kg m²/s / 138.58 kg m² = 8.11 rad/s

Therefore, the final angular speed of the turntable and the clay together is 8.11 rad/s.

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Answer:

It uses x-rays. The image is produced by polarizing exciting hydrogen nuclei of water molecules in the human tissue which will produce the image.  

Answer:

It uses x-rays. The image is produced by polarizing exciting hydrogen nuclei of water molecules in the human tissue which will produce the image.

haha ctrl + v go brrrrrrrrrrrrrr

Answer: Microtrauma stimulates muscle growth!

Explanation - I hope that helped!

Answer: I think it's C.

Explanation:2D is only one side and 3D has length width and height

Answer:

3d

Explanation:

The angle between the ladder and the ground is changing at rate of 2.4ft/s.

A right tringle is formed when ladder is against the wall,

x²+y² = 13²

dy/dt = -4ft/s

y = 5 feet

2[dx/dt] + 2[dy/dt] = 0

y = 10, x= √69 z = 13ft

2×√69[dx/dt] + 2×5×(-4) = 0

16.6[dx/dt] = 40

dx/dt = 40/16.6

dx/dt = 2.4 ft/s

The angle between the ladder and the ground is changing at rate of 2.4ft/s.

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The magnitude of the force F experienced by a charge q that moves in a direction perpendicular to a magnetic field B with a speed v is given by:

Isolate B from the equation:

Replace F=22.394N, q=0.049C and v=272.4m/s to find the strength of the magnetic field:

Therefore, the magnetic field strength is approximately 1.7T.

In the context of physics, work is defined to be the movement of an object when you apply a (pushing or pulling) force.

If you lifted a box to move it upward, then you are doing work. If you slide that box along the floor, then you are also doing work. However, if you try to lift something very heavy, but cannot move it at all, then 0 work is being applied. This is because the object hasn't moved. You need displacement to have work happen.

So that's why a physicist would not consider studying doing "work" (in the context of physics), though I'm sure they would be able to agree that studying does exercise the mind.

Answer:

The initial momentum of the bowling ball is 20 kgm/s.

Explanation:

Given;

mass of the bowling ball, m₁ = 5.0 kg

initial velocity of the bowling ball, u₁ = 4.0 m/s

mass of the Frodo, m₂ = 60 kg

initial velocity of Frodo, u₂ = 0

The initial momentum of the bowling ball is calculated as;

P = m₁u₁

P = 5 x 4

P = 20 kgm/s

Therefore, the initial momentum of the bowling ball is 20 kgm/s.

Answer:

B would be the correct answer