a projectile is launched from level ground with an initial speed v0 at an angle θ with the horizontal. if air resistance is negligible, how long will the projectile remain in the air?

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GiveN:

To FinD:

Step-by-step Explanation:

Using the first Equation of motion,

⇒ v = u + gt

⇒ v = 9.8 + -9.8(1)

⇒ v = 0 m/s

The final velocity is hence 0 m/s.

Answer:

D

Explanation:

The elastic potential energy stored in the compressed spring is determined as 11.6 J.

The elastic potential energy of the spring is the energy stored in the spring and the magnitude is calculated as follows;

U = ( ¹/₂kx² )

where;

The given parameters include the following;

the spring constant, k = 580 N/m

the extension of the spring, x = 0.2 m

Substitute the given parameters and solve for the elastic potential energy stored in the spring based on the compression produced by the two blocks.

U = ( ¹/₂kx² )

U = ( ¹/₂ ( 580 N/m ) ( 0.2 m )² )

U = 11.6 J

Thus, the elastic potential energy stored in the compressed spring is a function of the spring constant and extension of the spring.

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Answer:

Height and Velocity Functions

Explanation:

Multiply the height by 2, and divide the result by the object's acceleration due to gravity. If the object fell from 5 m, the equation would look like this: (2*5 m)/(9.8 m/s^2) =1.02 s^2.

Explanation:

Find an energy is E=mgh, so E=18*10*10=1800J

Answer:

fiction

Explanation:

When two opposite forces act perpendicular to an axis, it causes rotational motion or torque.

Torque and couple are both related to rotational motion and are often used interchangeably, but they refer to slightly different concepts.

Torque is a measure of the force that causes an object to rotate around an axis or pivot point.

It is equal to the force applied multiplied by the perpendicular distance between the axis and the line of action of the force. Torque is a vector quantity, meaning it has both magnitude and direction. Its unit of measurement is Newton-meters (Nm) or foot-pounds (ft-lbs) in the English system.

A couple, on the other hand, is a pair of equal and opposite forces that act on a body but do not cause it to translate. Instead, they create a pure rotational motion.

A couple generates torque, but unlike a single force, it doesn't have a line of action or a specific point of application. Instead, a couple is characterized by its magnitude and the distance between the forces. Couples are often used in mechanics to model rotational systems and analyze the behavior of rotating bodies.

Torque is the measure of the force that causes rotational motion, while a couple is a pair of forces that create pure rotational motion without causing any translation.

Therefore, If two opposite forces act perpendicular to an axis, it causes rotational motion or torque.

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Use the work formula:

W = Fd

Replacing we have:

W = 1 N * 1 m

Resolving operation:

W = 1 J

The work efectuated is 1 Joule.

Answer:

How much force is required to accelerate a 1000 kg car from a speed of zero to 27 m/s in 6 seconds?

Here we assume that the co- efficient of static force of friction is negligible for the surface , and write the given data as under,

initial velocity of the car =Vi = 0

final velocity of the car = Vf = 27 m /sec.

time required for the change in velocity = t = 6 sec.

mass of the car = m= 1000 kg

Force required to bring this change in velocity = F= ?

first we find acceleration = a = Vf - Vi / t

= 27 - 0 / 6 = 27 /6 = 4.5 m /sq.sec. = 4.5 N / kg

Now, by Newton`s 2nd law of motion,

F = ma = (1000 kg) x (4.5 N/kg) = 4500 N

To solve this problem using energy considerations, we can equate the potential energy of the ball at its maximum height (touching the roof) with the initial kinetic energy of the ball when it is released.

The potential energy of the ball at its maximum height is given by:

PE = mgh

Where m is the mass of the ball (190 g = 0.19 kg), g is the acceleration due to gravity (9.8 m/s^2), and h is the maximum height (11 m).

The initial kinetic energy of the ball when it is released is given by:

KE = (1/2)mv^2

Where v is the initial velocity we need to find.

Since energy is conserved, we can equate the potential energy and initial kinetic energy:

PE = KE

mgh = (1/2)mv^2

Canceling out the mass m, we can solve for v:

gh = (1/2)v^2

v^2 = 2gh

v = sqrt(2gh)

Plugging in the values:

v = sqrt(2 * 9.8 m/s^2 * 11 m)

v ≈ 14.1 m/s

Therefore, the minimum speed at which the ball must be tossed straight up to just touch the 11 m-high roof of the gymnasium is approximately 14.1 m/s.

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The most effective insulating material is polystyrene.

The material which isolates the body and doesn't allow heat and mass to flow out of the control system.

The insulating material should have the lowest thermal conductivity.

Polystyrene foam has low thermal conductivity which makes it a great insulator to heat.

Aluminum foil can be an effective insulating material because it doesn't flow heat out into the environment.

Cotton wool is effective, but not it is not fire resistant.

Thus, the best effective insulating material is polystyrene.

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Answer:

Increase height

Increase mass

1) The body moved from 0 cm to 4 cm at a constant speed of 1 cm/s.

2) The object moved at a constant speed of 3 cm/s from 0 cm to 3cm

3) Two objects are speeding up and one object is slowing down.

4) The object moved from 4s to 8s at a constant speed of 4 cm/s

5) The horizontal line appears at 5 m/s is the second graph.

We know that acceleration has to do with the change of of velocity of an object with time.

1) We can see that the position changes by equal amounts in equal time intervals thus the body moved from 0 cm to 4 cm at a constant speed of 1 cm/s.

2) Looking at the shape of the second graph we can see that the object moved at a constant speed of 3 cm/s from 0 cm to 3cm

3) From the images of the ticker tapes, we can see that two objects are speeding up and one object is slowing down.

4) From the fourth graph, we can see that the object moved from 4s to 8s at a constant speed of 4 cm/s

5) The graph in which the horizontal line appears at 5 m/s is the second graph.

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When the rotor rotates, it induces an electromagnetic field that rotates with it. This field induces a voltage in the stator windings, which is proportional to the speed of the rotor. If the rotor speed changes, the frequency of the electromagnetic field also changes, which causes a corresponding change in the frequency of the output voltage. Therefore, in order to maintain a constant output voltage frequency, the rotor speed must be kept constant, and this is achieved through synchronization with the power system that the generator is connected to.

An alternator's voltage drops sharply when it is loaded down with a lagging load because the load absorbs reactive power, which causes a drop in the voltage of the system. A lagging load is one in which the current lags behind the voltage, which means that it contains a significant amount of inductive reactance. This reactance causes the current to lead or lag behind the voltage, which causes a voltage drop across the inductive load. The voltage drop is proportional to the current, so as the load current increases, the voltage drop also increases, resulting in a lower output voltage.

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Explanation:

drinking water is water... but it is also good for you to drink water...

Answer:

f = 14.28 m

Explanation:

Given that,

Object distance, u = -50 m

The image distance from the lens, v = +20 m

We need to find the focal length of the lens. Let the focal length is f. Using the lens formula,

\(\dfrac{1}{v}-\dfrac{1}{u}=\dfrac{1}{f}\)

Put all the values,

\(\dfrac{1}{20}-\dfrac{1}{(-50)}=\dfrac{1}{f}\\\\f=14.28\ m\)

So, the focal length of the lens is equal to 14.28 m.

Answer:

most likely it will stay the same

Answer: Most likely purple

Explanation:

Answer:

Purple?

Explanation:

I'm confused what you are asking.

Everything in the universe is made up of matter or energy. Some ways that we have used energy today are turning on a light switch, using a microwave, driving a car, charging a phone.

Some examples of how energy is transformed in common everyday objects.

Turning on a light switch: When you turn on a light switch, you are completing an electrical circuit that allows electrons to flow through a wire and into a light bulb. The electrical energy is then transformed into light energy, which allows you to see.

Using a microwave: When you use a microwave to heat up food, the microwave emits electromagnetic radiation, which causes the water molecules in the food to vibrate and generate heat. The electrical energy from the microwave is transformed into thermal energy, which heats up your food.

Driving a car: When you start a car engine, the battery supplies electrical energy to the starter motor, which turns the engine. The chemical energy in the fuel is then transformed into thermal energy, which expands the gases in the engine and moves the pistons, which ultimately turns the wheels and propels the car forward.

Charging a phone: When you plug your phone into a charger, the electrical energy from the outlet is transformed into chemical energy, which is stored in the battery. The chemical energy is then transformed back into electrical energy when you use your phone.

These are just a few examples of how energy can be transformed in everyday objects.

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a. The free-body diagrams for each crate can be drawn as follows: Crate with mass 45 kg:img Crate with mass 35 kg:b. In this case, the applied force is just enough to keep the crates from sliding. Thus, the tension in the rope will be equal to the weight of the 45 kg crate and the frictional force opposing motion will be the static friction.

Therefore, we can write:Tension in the rope = Weight of 45 kg crate= m1g= 45 kg × 9.8 m/s²= 441 Nfrictional force opposing motion = static friction = μsN = 0.5 × m2g = 0.5 × 35 kg × 9.8 m/s²= 171.5 NThus, the force applied, F, must be equal to the sum of these two forces. Therefore,F = Tension in the rope + frictional force opposing motion= 441 N + 171.5 N= 612.5 Nc. In this case, the 35 kg crate is sliding to the right with a constant velocity. This means that the applied force is just enough to overcome the frictional force opposing motion, but not enough to cause acceleration. Therefore, the force of friction opposing motion will be the kinetic frictional force.

Thus, we can write:Tension in the rope = Weight of 45 kg crate= m1g= 45 kg × 9.8 m/s²= 441 Nfrictional force opposing motion = kinetic friction = μkN = 0.3 × m2g = 0.3 × 35 kg × 9.8 m/s²= 102.9 NThus, the force applied, F, must be equal to the sum of these two forces. Therefore,F = Tension in the rope + frictional force opposing motion= 441 N + 102.9 N= 543.9 N In part a, the free-body diagrams for each crate has been drawn which is 30 words.In part b, the force required has been calculated which is 70 words.In part c, the free-body diagrams for each crate have been drawn and the force required has been calculated which is 55 words.

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Answer:

Melting

Explanation:

I took the quiz and got it right so I am 100 percent sure the answer is, A.melting :)

Answer:

melting

Explanation:

its right lol :)

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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An object's acceleration is its rate of change of velocity which depends on speed which is its rate of change of position and direction.

Explanation:

The definition of acceleration is the rate of change of velocity. Velocity is a vector quantity which depends on size (magnitude) and direction. When a car speeds up, it doesn't stay in one place speeding up so the position changes. I hope my answer is correct.

Have a good day!

Acceleration of a body is the rate of change of its velocity. It depends on its speed and direction. Where, speed is the rate of change in its position.

Acceleration is a physical quantity representing the rate of change of velocity of a moving object. Acceleration and velocity  are  vector quantities thus, having magnitude and direction.

Velocity is the rate of speed. Hence it depends on the magnitude of speed and direction. Speed is scalar quantity measuring the rate of change in position. Thus, speed is distance by time.

Therefore, the first column is filled  with velocity and second and third with speed and position. The 4th column is filled with direction.

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Faith, respect, and effective communication are the three tips to start a healthy dating relationship mentioned in the article.

What are three recommendations for beginning a happy relationship?

Trust, respect, effective communication, adaptability, a common interest, time apart, different connections (with family and friends), and appreciation. Each partner needs to have confidence in the other. Never should your partner belittle you, test you, or say anything disparaging about you.

What are good relationships?

Healthy relationships involve open communication, honesty, trust, and respect between partners as well as work and compromise from both parties. There is no imbalance of power. Partners are free to make decisions together, respect each other's independence, and take individual actions without worrying about the consequences.

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Answer:

Explanation:

Volume = Length x width x height

Multiply the length, width and, height to get the volume of the question.

Answer: Answer is D

I took the test little while back.

When curling the hair for a thermal design, a hard-rubber or nonflammable comb should be positioned near the base of the hair section.

This is because the heat from the curling iron or other thermal tool can cause the comb to melt or become damaged if it is too close to the heated area. Placing the comb near the base of the hair section also helps to create a smooth and even curl.

Additionally, using a nonflammable comb helps to prevent any potential fire hazards that could occur if a plastic comb were to come into contact with the heat source. Overall, positioning the comb properly and using the right type of comb are important factors in achieving a safe and effective thermal design.

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Electromagnetic radiation which is visible to the human eye is only visible light and not all electromagnetic radiation. Best choices provided  is F (false).

Electromagnetic radiation are the wave which is form of energy and includes the waves such as radio waves, gamma waves, visible light waves etc.

Types of electromagnetic radiation-

Thus the electromagnetic radiation which is visible to the human eye is only visible light and not all the electromagnetic radiation. Best answer from the choices provided F (false).

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Answer:

False

Explanation:

Have the day you deserve :)