NEED HELP ASAP!!!!! IN MIDDLE OF TEST RN HELP PLZ
In the formula vy = ayt, what is the value of ay for an object in projectile motion?

1)–9.8 m/s2
2)0 m/s2
3)m/s2
4)1.0 m/s2

Answer:

Explanation:

X-Rays are ''minor'' electromagnetic waves than Gamma Rays.

Gamma rays are the strongest waves in the electromagnetic spectrum with a length order of [tex]10^{-12}[/tex], which indicates a really intensive frequency, those characteristics allow to display a high energy amount.

The second most intense electromagnetic waves are X-Rays, stronger that ultraviolet, visible, infrared, microwaves and radio waves; but weaker than Gamma Rays.

According to the principle of conservation of momentum, two bowling balls of different masses can maintain the same momentum as long as the product of their mass and velocity is identical. Essentially, a lighter ball would need to move faster and a heavier ball slower to achieve the same momentum.

The subject matter of your question is fundamentally linked to the principle of conservation of momentum which states that the total momentum of a closed system remains constant if no external forces act upon it. Momentum, denoted as 'p', is the product of an object's mass 'm' and its velocity 'v' (p=mv).

Therefore, even if two bowling balls have different masses, they can still have the same momentum if their velocities compensate for the difference in mass. For instance, a lighter ball (smaller m) would need to be moving faster (higher v), while a heavier ball (larger m) would need to be moving slower (smaller v).

Consider this example: a 5 kg bowling ball moving at 2 m/s and a 10 kg bowling ball moving at 1 m/s. Even though the balls have different masses, their momenta are the same (5 kg * 2 m/s = 10 kg * 1 m/s = 10 kg m/s).

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Common force fields are the gravitational field, generated by masses (like the Earth), and the electromagnetic field, generated by charged particles. These force fields can exert influence over distances without direct physical contact, such as the gravitational influence of the Sun on Earth's orbit. These concepts are crucial understanding tools in the study of physics.

Common examples of force fields include the gravitational field and the electromagnetic field. The source of the gravitational field is any object with mass- an example being the Earth, whose gravitational field is what gives objects weight. The electromagnetic field is generated by charged particles- for instance, a charged rubber comb generates an electromagnetic field that attracts neutral bits of paper via the Coulomb force.

These field forces act at a distance, meaning they can exert influence without physical contact. For example, the Sun's gravitational field influences the Earth's orbit, despite the vast distance between these two celestial bodies. Similarly, stationary electric charges can generate electric fields that exert force on other distant charges.

Understanding fields is crucial in the study of physics, as it helps to visualise forces and how they are transmitted. They also connect with the concept of elementary particles and their interactions in the macroscopic world, making the fields concept an essential tool for grasping complex physical phenomena.

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Answer: The heavy truck

Explanation: Momentum is defined as the amount of movement.

It can be written as P = m*v

Where P is the momentum, m is the mass of the object and v is the velocity.

So you can see that if the mass increases, also does the momentum, so if both trucks move at the same velocity, then the truck with the bigger mas will have a bigger momentum.

Then the correct answer is the heavy truck

The scientist Kepler was known to have relied on observations and data of Tycho Brahe to formulate his laws of planetary motion.

Kepler is the scientist who is credited with the three laws of planetary motion. These laws set the tone fro the advances in the study of astronomy today.

However, the scientist Kepler was known to have relied on observations and data of Tycho Brahe to formulate his laws of planetary motion.

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The example of positive feedback is, " warmer temperatures on earth's surface decrease the evaporation of water."

     Warmer temperature on the earth's surface decreases the evaporation of water.

Because, the temperature of the earth will become hot , cold, warm etc.. this happens due to the evaporation of water.

Hence, Option A is the correct answer.

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Answer: 13.5

Explanation: Obtained from this

C) ω = 0 = ωo + αt = 6.3rad/s - 0.74rad/s² * t

t = 8.5 s ← after the given 5 s, or 13.5s total

-- alternate: --

ω = 0 = ωo + αt = 10rad/s - 0.74rad/s² * t

t = 13.5 s

The time taken for the fan to stop after it has been turned off is 7 s.

The given parameters;

The angular acceleration of the fan is calculated as;

[tex]\alpha = \frac{\Delta \omega }{t} = \frac{\omega _2 - \omega _1}{t} \\\\\alpha = \frac{7-12}{5} \\\\\alpha = -1 \ rad/s^2[/tex]

The angular displacement of the blades  before stopping is calculated as;

[tex]\omega_f^2 = \omega_i^2 + 2\alpha \theta \\\\\0 = \omega_i^2 + 2\alpha \theta\\\\-2\alpha \theta = \omega_i^2 \\\\\theta = \frac{\omega_i^2}{-2\alpha } \\\\\theta = \frac{(7)^2}{-2(-1)} \\\\\theta = 24.5 \ rad[/tex]

The time taken for the blade to make this angular displacement is calculated as;

[tex]\theta = \omega_it + \frac{1}{2} \alpha t^2\\\\24.5 = 7t + (0.5)(-1)(t)^2\\\\24.5 = 7t - 0.5t^2\\\\0.5t^2 -7t + 24.5 = 0\\\\solve \ the \ quadratic \ equation \ using \ formula \ method\\\\a = 0.5, \ \ b = -7, \ \ c = 24.5 \\\\t = \frac{-b \ \ +/- \ \sqrt{b^2 - 4ac} }{2a} \\\\t = \frac{-(-7) \ \ +/- \ \sqrt{(-7)^2 - 4(0.5\times 24.5)} }{2(0.5)}\\\\t = 7 \ s[/tex]

Thus, the time taken for the fan to stop after it has been turned off is 7 s.

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Final answer:

The centripetal accelerations of two identical cars rounding banked curves at the same speed, radius, and angle on Earth and the Moon are the same since the formula for centripetal acceleration, which is velocity squared divided by radius, does not depend on the local acceleration due to gravity.

Explanation:

When comparing the centripetal accelerations of two identical cars rounding banked curves with the same speed, radius, and angle, one on Earth and one on the Moon, an important factor to consider is the acceleration due to gravity on each body. The formula for centripetal acceleration (ac) is ac = v²/r, where v is the velocity of the car and r is the radius of the circular path.

Given that both cars have the same speed (v) and radius (r), and that the centripetal acceleration is not directly dependent on gravity, the centripetal accelerations will be the same for both cars. It is essential to note that the gravitational force would affect the normal force and the friction available, but this does not change the centripetal acceleration required to keep the cars on their paths. Therefore, the correct answer is: c. the centripetal accelerations are the same for both cars.

The calculation of 2 x 10^-3 cm ÷ 2.5 x 10^4 cm, translated in scientific notation ends up with a result of 8 x 10^-8 cm.

To calculate 2 x 10^-3 cm ÷ 2.5 x 10^4 cm, you start by performing the multiplication and division operations separately. That gives us (2*10^-3) cm and (2.5*10^4) cm. Before dividing these two results, make sure they're expressed in the same scientific notation. It's important to note that multiplying or dividing quantities in scientific notation involves separately multiplying or dividing the coefficients and adding or subtracting the exponents, respectively.

In this case, the calculation would be (2 ÷ 2.5) x 10^(-3-4), which simplifies to 0.8 x 10^-7. This can also be represented as 8 x 10^-8 cm.

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1. D) 300 J

The work done by a constant force is given by:

[tex]W=Fdcos \theta[/tex]

where F is the force applied, d is the distance, and [tex]\theta[/tex] is the angle between the direction of the force and the direction of motion.

In this problem, F=200 N, d=1.5 m while [tex]\theta=0^{\circ}[/tex], because the force is parallel to the motion of the box, therefore the work done is

[tex]W=(200 N)(1.5 m)(cos 0^{\circ})=300 J[/tex]

2. C) 48,000 J

We can use the same formula used in the previous part of the problem:

[tex]W=Fdcos \theta[/tex]

In this case:

F=480 N

d=100 m

[tex]\theta=0^{\circ}[/tex]

So the work done is

[tex]W=(480 N)(100 m)(cos 0)=48,000 J[/tex]

Yes, an object can have both kinetic energy and potential energy at the same time, such as a ball during its flight. These forms of energy can transform into each other without external work in a closed system.

An object can indeed have both kinetic energy and potential energy at the same time. For instance, a ball thrown in the air has kinetic energy due to its motion and potential energy due to its height above the ground. As it rises, its kinetic energy decreases while its potential energy increases, and vice versa when it falls back down. Energy transformation between kinetic and potential energy occurs without the need for external work if no friction or air resistance is present. In a closed system where no energy is lost to the environment, the sum of potential and kinetic energy remains constant according to the conservation of energy principle.

Given data :

Velocity of radar signal, v = Velocity of light = 3 x 10^8 m/s

Greatest distance between Venus and Earth d1 = 0.47 AU = 0.47 AU (a.5 x 10^11 m / 1 AU) = 7.1x10^10 m

Closest distance between Venus and Earth, d2 = 0.28 AU = 0.28 AU (1.5 x 10^11 m / 1 AU)= 4.2 x 10^10 m

The time take by radar signal to travel from Earth to Venus and back when Venus is brightest is calculated as

T1 = 2d1/v = 2(7.a x 10^10 m / 3 x10^8 m/s) = 473 s

The time taken by radar signal to travel from Earth to Venus and back when Venus is closest is calculated as

T2 = 2d1/v = 2 (4.2 x 10^10 m) / 3 x 10^8 m/s = 280 s

Answer:

B. 4

Explanation:

Beat frequency (fb) is calculated as follows:

fb = |f1 - f2|

where f1 and f2 are two sounds frequencies, in this case, 24 Hz and 20 Hz. Replacing in the equation:

fb = |24 - 20| = 4 Hz

Then, they should produce they 4 beats per second

The two pieces of pure copper must have the same temperature. The correct option is A.

The density is the ratio of the mass and the volume of the object. It is denoted by ρ.

ρ = mass/Volume = m/V

Given are the two pieces of pure copper. One is cube in shape and another is cuboid.

Both will have different volume. As volume is related to the mass and density. So, they are also different for the two pieces of copper. But, the temperature does not depends on the remaining parameters.

Thus, the correct option is A.

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Answer:the answer is C. PLATO

Explanation:

Answer:

Newton's 3rd Law

Explanation:

Justin travels a total distance of 17 km. His displacement is approximately 11.7 km, 20° west of south from his starting point.

To determine the total distance travelled by Justin, we simply add all the distances travelled:

Total distance = 12 km + 4 km + 1 km = 17 km.

To find the displacement, we need to consider the initial and final positions. Justin's final position relative to the starting point involves a vector calculation.

Vertical displacement (south - north): 12 km (south) - 1 km (north) = 11 km south.

Horizontal displacement (west): 4 km west.

Using the Pythagorean theorem, the displacement can be calculated as follows:
Displacement= √((11 km)² + (4 km)²) = √(121 km² + 16 km²) = √137 km² ≈ 11.7 km.

Using trigonometry to find the direction, the angle θ from the south direction is:

tan(θ) = opposite/adjacent = 4/11 ≈ 0.364.

θ ≈ atan(0.364) ≈ 20° west of south.

Displacement = 11.7 km, 20° west of south.

Answer:

Increased plant growth and damage to drinking water

Explanation:

Nitrogen-enhanced fertilizers aid in plant growth and improve agricultural yield, but excessive or improper use can cause eutrophication, harming aquatic ecosystems.

Nitrogen-enhanced fertilizers have both positive and negative impacts on the environment. On the positive side, such fertilizers boost the growth of crops by providing them with an ample supply of necessary nutrients, including nitrogen. In particular, plants benefit from an abundant supply of nitrogen; soils are ultimately enriched, providing higher yields in agriculture.

However, these fertilizers, when used excessively or improperly, can cause significant harm to both freshwater and marine ecosystems. The nitrogen and phosphorus from the fertilizers can enter drainage systems and accumulate in water bodies, causing eutrophication- an overgrowth of algae that depletes dissolved oxygen levels, negatively affecting aquatic organisms. This process eventually creates inhospitable conditions for many forms of marine and freshwater life, culminating in areas known as dead zones. This overuse and negligence in the application of such fertilizers is a major cause of such detrimental effects.

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Using Kepler's Third Law, the period of Satellite A, which has an orbital radius 3 times greater than that of Satellite B with a period of 120 minutes, is calculated to be approximately 519.6 minutes.

The period of Satellite A, with an orbital radius 3 times greater than Satellite B, can be found using Kepler's Third Law, which relates the orbital period of a satellite to its orbital radius. Kepler's Law states that the square of the orbital period is proportional to the cube of the radius of its orbit. Since Satellite B has an orbital period of 120 minutes, we can set up the proportion (T_A/T_B)^2 = (R_A/R_B)^3, where T_A is the unknown period of Satellite A, T_B is the known period of Satellite B, R_A is the orbital radius of Satellite A and R_B is the orbital radius of Satellite B. Because R_A is 3 times R_B, the proportion becomes (T_A/120 min)^2 = 3^3. Therefore, T_A = 120 min x √(3^3), which simplifies to T_A = 120 min x 3√3. After calculating, T_A's period is found to be approximately 519.6 minutes.

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