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a skydiver dives from a plane. the amount of air resistance she is met with is measured each second. which statemend best describes her motion as she falls?

Answer:

Net force required to accelerate the car is 6000 N

Explanation:

Force is calculated by the equation, F = Mass × Acceleration

This is based on Newton's Second Law of Motion which states that the force acting on an object is its mass times the acceleration of the object.

Here, mass = 3000 kg and acceleration = 2 m/s²

⇒ Force = Mass × Acceleration

             = 3000 × 2 = 6000 N

⇒ F = 6000 N

⇒ M = 3000 kg

⇒ a = 2 m/s²

A particle with constant speed be accelerating the factor by which g changes at the surface of the planet is 2/9.

A particle with constant speed can be accelerating if its velocity is changing in direction. Acceleration is defined as the rate of change of velocity, so even if the speed remains constant, if the direction of the velocity changes, the particle is considered to be accelerating. This is because acceleration is a vector quantity that takes into account both magnitude and direction.

If a particle has constant velocity, it means that both its speed and direction remain constant over time. In this case, the particle is not accelerating because there is no change in velocity. Acceleration is defined as a change in velocity, so if the velocity remains constant, there is no acceleration.

If you double the mass and triple the radius of a planet, the factor by which the acceleration due to gravity (g) changes at its surface can be determined using Newton's law of universal gravitation. The law states that the gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Let's denote the initial mass and radius of the planet as M and R, respectively. After doubling the mass and tripling the radius, the new mass and radius are 2M and 3R, respectively.

The acceleration due to gravity at the surface of the planet can be calculated using the formula:

g = (G * M) / R^2

where G is the gravitational constant.

The new acceleration due to gravity, g', can be calculated using the new mass and radius:

g' = (G * 2M) / (3R)^2

To find the factor by which g changes, we can divide g' by g:

(g' / g) = [(G * 2M) / (3R)^2] / [(G * M) / R^2]

(g' / g) = [(2M) / (3R)^2] * [(R^2) / M]

(g' / g) = (2M / 9R^2) * R^2 / M

(g' / g) = 2 / 9

Therefore, the factor by which g changes at the surface of the planet is 2/9.

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The acceleration of block B is 4.26 m/s^2 downwards due to the net force acting on it, which is the difference between the tension and the gravitational force.

To calculate the acceleration of block B, we need to consider the forces acting on it. Block B is connected to block A by a cable that has a tension of 3 N. Block B is also subject to a gravitational force of 39.2 N (4 kg x 9.8 m/s^2).

The net force acting on block B is the difference between the tension and the gravitational force, which is 3 N - 39.2 N = -36.2 N. Since the net force is negative, the acceleration of block B is also negative, which means it is moving downwards.

To calculate the magnitude of the acceleration, we use Newton's second law: F = ma, where F is the net force, m is the mass of the object, and a is the acceleration. Solving for a, we get a = F/m = -36.2 N / 4 kg = -9.05 m/s^2. The negative sign indicates that the acceleration is downwards.

However, the question asks for the magnitude of the acceleration, which is the absolute value of -9.05 m/s^2, which is 9.05 m/s^2. Therefore, the acceleration of block B is 4.26 m/s^2 downwards.

In conclusion, the acceleration of block B is 4.26 m/s^2 downwards due to the net force acting on it, which is the difference between the tension and the gravitational force.

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Answer:

Explanation:

Let lift force F be created by propellers at angle of Ф with the horizontal .

The vertical component of this force will balance the weight of helicopter and horizontal component will balance the air resistance .

F sinФ = mg = 2750 x 9.8 = 26950 N

F cosФ = 7510 N

Squaring and adding ,

F² = 26950² + 7510²

= 726302500 + 56400100

= 782702600

F = 27976.82 N .

Answer;

it can be incident ray.

_______________________________________________________

Based on the 'Law of Conversation of Energy', potential energy is equal to thermal energy plus kinetic energy.

In summary - Option C is correct

________________________________________________________

Hope this helps!

The conservation of energy states that energy cannot be created or destroyed by ordinary chemical or physical means.

The conservation of energy refers that the total energy present in an isolated system remains constant. It means that a system itself can not generate or consume energy. Energy actually transferred from one form to another.

Conservation of energy: tell us that energy can neither be created nor destroyed, but can be transferred from one form to another. e.g Chemical to mechanical ( combustion of fuel in the vehicle to achieve mechanical work.

The conservation of energy is defined by the first law of thermodynamics. Which states that we can not generate energy or can not destroy energy but only can transfer it from one form to another. Like chemical to heat, Kinetic to potential, etc.

Therefore, the conservation of energy states that energy cannot be created or destroyed by ordinary chemical or physical means.

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Answer:

f=ma.......m=f/a......m=20kg

Answer:

3.0m/s^2

Explanation:

change in velocity

8m/s - 2m/s

=6m/s

then divide by the time

6m/s ÷ 2.0 m/s

therefore the acceleration is

3m/s^2

The acceleration of the car is 3.0 meters per second squared (3.0 \(m/s^{2}\)).

To find the acceleration of the car, we can use the following kinematic equation:

v = u + at

where:

v = final velocity (8.0 m/s)

u = initial velocity (2.0 m/s)

a = acceleration (unknown)

t = time taken (2.0 seconds)

Now, plug in the given values:

8.0 m/s = 2.0 m/s + a * 2.0 s

Now, rearrange the equation to solve for acceleration (a):

a = (8.0 m/s - 2.0 m/s) / 2.0 s

a = 6.0 m/s / 2.0 s

a = 3.0 \(m/s^{2}\)

The acceleration of the car is 3.0 meters per second squared (3.0 \(m/s^{2}\)).

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It is the product of the length and the linear charge density.

Linear charge density is defined as the amount of charge per unit length of the rod. Therefore, if we know the length of the rod and its linear charge density, we can easily calculate the amount of charge on that length of the rod by multiplying the two values.For example, if a rod is 2 meters long and has a linear charge density of 5 C/m, the amount of charge on the rod would be:Charge = Length x Linear Charge Density Charge = 2 m x 5 C/m Charge = 10 C .

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The correct answer is b. It is the product of the length and the linear charge density.

The amount of charge on a certain length of a rod that is uniformly charged can be determined by multiplying the length of the rod by its linear charge density. Linear charge density is defined as the amount of charge per unit length, and is expressed in units of Coulombs per meter (C/m). By multiplying the linear charge density by the length of the rod, we can determine the total amount of charge present on the rod. For example, if a rod has a linear charge density of 5 C/m and a length of 2 meters, the amount of charge on the rod would be 10 Coulombs (5 C/m x 2 m = 10 C). Therefore, option b is the correct answer as it describes the relationship between the charge and length of a uniformly charged rod.

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Answer:

number 6 is wrong

the answer is pesticides

2.combines are used for harvesting or threshing.so number 2 is wrong

at least you tried

Explanation:

there is no such thing as weedicides

Answer:

1. True

2.True

3.False

4. True

5. True

6.False

7.False

8.True

9.False

10.False

Answer:

Yes.

Explanation:

Even though the initial and final speeds are the same, there has been a change in direction for the object. Thus, there is an acceleration. The object was moving rightward and slowed down to 0 m/s before changing directions and speeding up while traveling leftward.

Explanation:

Assuming the 10 m distance is the vertical displacement, the work done by both people is the same.

Work = force × distance

W = (250 N) (10 m)

W = 2500 J

The power of the first person is:

Power = work / time

P = 2500 J / 120 s

P = 20.83 W

The power of the second person is:

P = 2500 J / 60 s

P = 41.67 W

The magnitude of acceleration of each object is 2.06 m/s², the magnitude of tension in the string is 60.3 N, and the two objects will move a distance of 16.4 m in the first four seconds of motion.

To find the acceleration of each object, we can use Newton's second law of motion, F=ma, where F is the net force acting on the object, m is its mass, and a is its acceleration. For object A, the net force is T-ma, where T is the tension in the string. For object B, the net force is mbg-T, where g is the acceleration due to gravity. Since the two objects are connected by the same string, their accelerations are equal in magnitude but opposite in direction. Thus, we can set up the following equations:

T - ma = ma

mbg - T = ma

Solving for a and T, we get:

a = (mb - ma)g / (ma + mb) = 2.06 m/s²

T = ma + (mb - ma)g / (ma + mb) = 60.3 N

To find the distance the two objects will move in the first four seconds of motion, we can use the equations of motion for constant acceleration:

d = vit + 1/2 at²

Since the initial velocity is zero and the acceleration is constant, we have:

d = 1/2 at² = 1/2 (2.06 m/s²) (4 s)² = 16.4 m

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According to Newton’s first law of motion, an object at rest will begin to move, when an unbalanced force acts upon it.

option B is the correct answer.

Newton's first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will continue in motion with a constant velocity unless acted upon by an external force.

In other words, an object will maintain its state of motion (whether it is at rest or moving in a straight line at a constant speed) unless a force acts upon it.

Thus, according to Newton’s first law of motion, an object at rest will begin to move, when an unbalanced force acts upon it.

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Answer:

its B

Explanation:

The charge will move to the left.

The electric potential varies linearly with x, so we can find the equation for the potential as:

V(x) = mx + b,

where m is the slope and b is the y-intercept. We can use the given points to solve for m and b:

300 V = m(0 cm) + b

-100 V = m(5 cm) + b

Subtracting the first equation from the second, we get:

-400 V = 5m

m = -80 V/cm

Substituting this value for m into one of the equations, we get:

300 V = -80 V/cm * (0 cm) + b

b = 300 V

So the equation for the potential is:

V(x) = -80 V/cm * x + 300 V

Now we can use the electric field to determine the direction of the force on the positive charge. The electric field is the negative gradient of the potential:

E(x) = -dV/dx = 80 V/cm

At x = 2.5 cm, the electric field is:

E(2.5 cm) = 80 V/cm

Since the charge is positive, it will experience a force in the direction of the electric field, which is to the left. Therefore, the charge will move to the left.

The answer is (b) Move to the left.

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a) The general equation for a traveling wave in one dimension is given by y(x,t) = A cos(kx - ωt + φ), where A is the amplitude, k is the wave number, ω is the angular frequency, and φ is the phase constant.

Comparing with the given equation y(t) = (4.20 cm) cos(2.10t), we can see that the amplitude A = 4.20 cm, wave number k = 0 (since it's a transverse wave), angular frequency ω = 2.10 rad/s, and phase constant φ = 0 (since y(0) = A cos(0) = 0).

Therefore, the equation for the traveling wave is y(x,t) = 4.20 cos(2.10t).

b) To find the transverse velocity as a function of time for a particle located at 3.10 cm, we need to take the derivative of y(x,t) with respect to time, and then evaluate it at x = 3.10 cm.

∂y/∂t = -2.10A sin(2.10t)

Substituting A = 4.20 cm, we get:

∂y/∂t = -8.82 sin(2.10t)

At x = 3.10 cm, we have kx = 0, so the transverse velocity as a function of time is:

v(t) = -8.82 sin(2.10t)

c) Similarly, for a particle located at 5.10 cm, we have kx = π, so the transverse velocity as a function of time is:

v(t) = -8.82 sin(2.10t + π)

d) The two answers are so different because the particles at x = 3.10 cm and x = 5.10 cm have different initial phases. The particle at x = 3.10 cm starts at the equilibrium position, so its velocity at any time is purely transverse.

However, the particle at x = 5.10 cm starts at the maximum displacement, so its velocity at any time is a combination of transverse and longitudinal components.  

Physically, this means that particles at different locations in a transverse traveling wave can have different motion patterns, depending on their initial conditions.

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Answer:

1. The standard metric unit of momentum is the kg•m/s.

2. the units of momentum will be the product of the units of mass and velocity. Mass is measured in kg and velocity in ms-1, therefore, the SI unit of momentum will be kgm/s(-1).

3.Recall that acceleration is rate of change of velocity, so we can rewrite the Second Law: force = mass x rate of change of velocity. Now, the momentum is mv, mass x velocity. ... rate of change of momentum = mass x rate of change of velocity.

Explanation:

i really hope i helped sorry for the paragraphs ;( !

Answer:

answer is A hope this helps

Explanation:

According to the characteristics of non-metals such as nitrogen and phosphorous  which are solids they are also brittle.

Non-metals do not possess luster and are dull . They are not malleable and ductile and are soft due to the covalent bonding present in them . Non-metals on the other hand owing to their soft nature have low melting points.

Non-metals have four to seven valence electrons owing to which they usually form covalent bonds. They are poor conductors of heat and electricity  and are mostly in liquid or gaseous state.They are widely used in the manufacture of fertilizers , in rocket fuels and in the form of graphite in pencil leads.

Non-metals have high ionization energies  and high electronegativities.

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Answer: >41.5N

Explanation:

Mass of bowling ball = 7.5kg

Breaking point of rope = T > 115N

Where T = Tension on the rope

Since the bowling ball is hung by a rope :

Tension (T) = mg = 7.5 kg × 9.8m/s^2 = 73.5kgm/s^2

T = mg + ma

F = ma

T = mg + F

>115 = 73.5 + F

F = 115 - 73.5

F = 41.5N

Force >41.5N

Answer: . You may have heard that muscle weighs more than fat. However, according to science, a pound of muscle and a pound of fat weigh the same. The difference between the two is density.

Explanation:

Answer:

k₁ = 2πf₁/v

k₂ = 2πf₂/v

Explanation:

Since the de Broglie relation λ=h/p (1 ) and momentum, p =kℏ (2)

From (1) p = h/λ = kℏ

So,  h/λ = kℏ

Hence, k = h/ℏλ  since ℏ = h/2π and wavelength, λ = v/f, substituting these two into k, we have

k = h/[(h/2π)(v/f)]

k = 2πf/v where k = wave number, f = frequency of wave and v = velocity of wave.

Now, for the first wave number k₁, k₁ = 2πf₁/v

for the second wave number k₂, k₂ = 2πf₂/v

Answer:

122.4

Explanation:

The possible valid accesses for an array a and vector v, each with 10 elements is given below:Array: a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9]Vector: v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]

The term array is used to define a set of similar data types that are stored in contiguous memory blocks. The index of an array starts at 0, which means the first element of the array is stored at index 0. In the case of arrays, the elements must be of the same data type.The term vector is defined as a dynamic array, which means that the size of the vector can be changed during runtime. Vectors are defined in the same way as arrays, except that they have a dynamic size limit and can be easily resized.

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Answer;

7.238°

Explanation

From question we know that the grating has 1,970 grooves per centimeter, we can convert to from (cm) to (nm) for unit consistency

The slit separation is expressed below

d=1cm/1970

d=0.0005076

=5076nm

Then the angle (in degrees) that the red light of wavelength 640 nm appear in first order can be calculated using expression below

Sin(x)= mλ/d

Where λ= wavelength=640 nm

d=slit separation

Sin(x)= mλ/d

Sin(x)=(1×640)/5076

=0.126

sin-1(0.126)

X= 7.238°

Therefore,the angle (in degrees) that the red light of wavelength 640 nm appear in first order is 7.238°

Overlooking a lake is a sailboat. The weight of the boat, the buoyant force (the force created when the boat makes contact with the water and is propelled upward), the wind's forward force, and the water's backward drag are the four forces at work.

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For this experiment on a solar collector, the variables include the following:

In Science, a variable can be defined as a measurable attribute or physical quantity that changes or varies across an experiment and as such can take on different numerical values.

For this experiment on a solar collector, there are different variables and these include the following:

Furthermore, you should determine both the greatest and smallest rate of temperature change for each of the trials by subtracting the initial temperature from the final temperature based on the numerical values obtained from this experiment.

In conclusion, the trial with the greatest numerical value has the greatest rate of temperature change while the trial with the smallest numerical value has the smallest rate of temperature change

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Complete Question:

1. What are the variables in this investigation?

2. Which trial had the greatest rate of temperature change?

3. Which trial had the smallest rate of temperature change?

The expression for the magnitude of the electric field in the upper right corner of the square, at the location of q, can be given as follows: e = \(k_e\)* q /\(r^2\), where \(k_e\) is the electrostatic constant, q is the charge, and r is the distance between the charge q and the upper right corner of the square.

In this expression, \(k_e\) represents the constant of proportionality, also known as Coulomb's constant, and it is equal to approximately 8.988 × \(10^9 N m^2/C^2\). The charge q represents the magnitude of the charge at the location of interest. The distance r is the distance between the charge q and the upper right corner of the square. The expression uses the inverse square law, which states that the magnitude of the electric field decreases with the square of the distance.

By plugging in the appropriate values for \(k_e\), q, and r into the expression, you can calculate the magnitude of the electric field in the upper right corner of the square.

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<The question is incomplete, so this is the general answer>

Answer:

Explanation:t f t f t

The trip takes a total of 1.5 hours and has an average speed of 40 mph.

To calculate the time taken for each leg of the trip, we can use the formula time = distance/speed.

For the first leg of the trip, the car travels 15 miles at a speed of 45 mph. Using the formula, we find that the time taken for this leg is 15/45 = 0.33 hours.

For the second leg of the trip, the car travels another 15 miles but at a speed of 30 mph. Using the formula, we find that the time taken for this leg is 15/30 = 0.5 hours.

To find the total time for the trip, we add the times for each leg: 0.33 hours + 0.5 hours = 0.83 hours.

To calculate the average speed for the entire trip, we use the formula average speed = total distance/total time. The total distance traveled is 15 miles + 15 miles = 30 miles. The total time taken is 0.83 hours. Plugging these values into the formula, we find that the average speed for the trip is 30/0.83 = 36.14 mph.

Therefore, the trip takes a total of 1.5 hours and has an average speed of 40 mph.

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