james throws a baseball straight upward. we can ignore air resistance.what is true about the acceleration and velocity of the ball on its way down?assume that upward is the positive direction.

To study vectors it is best to select a coordinate system and manipulate it in that coordinate system and the component of A in x is 0.9396 while in y it is 0.342.

An item with both magnitude and direction is referred to be a vector.

A vector can be visualized geometrically as a straight spline, with a pointing in the orientation and a length equal to the value of the vector.

A vector has magnitude and direction so we can form a vector coordinate system and manipulate each vector in that such that it will be clear to study all vectors.

Given the vector A,

Magnitude |A| = 1 units

The angle of inclination from the x-axis is 20°.

Component of A in the x-axis ⇒

|A|cos20° = 1(0.9396) = 0.9396

Component of A in the y-axis ⇒

|A|sin20° =1(0.342) = 0.342

Hence "The component of A in x is 0.9396 while in y it is 0.342".

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Given question is incomplete with the missing image attached below;

Answer:

Average speed = 25m/s

Acceleration = 12.5m/s^2

Explanation

Let the distance covered by Riley be 50m

Average speed = Distance/Time

Average speed = 50/2

Average speed = 25m/s

Acceleration = Speed/time

Acceleration = 25/2

Acceleration = 12.5m/s^2

Note that the value of the distance was assumed

The resistance of the resistor in this circuit is 82.31 Ohms

We would first have to solve for the angular frequency

ω = 2π* f

f = 180 hz

= 2* 3.14 * 180

= 1130.4

Next we would have to solve for the  Inductive reactance XL = ω* L

= 1130.4 * 0.027

= 30.52

The current is

3.2 v / 30.52

= 0.1048

Impedance Z = V/ I

9.2 v / 0.1048

= 87.79

To get the resistance we would have to use

Z² = (R² + XL²)

87.79² = R² + 30.52²

R²  = 87.79² - 30.52²

= 7707.08 - 931.47

= 6775.6

R = √6775.6

= 82.31 ohms

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ANSWER:

B. mechanical

STEP-BY-STEP EXPLANATION:

Sound or sonic waves are a mechanical waves created by a vibrating object.

So the correct answer is B. mechanical

The mechanical advantage Moves the fulcrum closer to the clay block. Option B.

You can increase the mechanical advantage of the lever by increasing the power arm or decreasing the load arm. The mechanical advantage of the lever can be increased by increasing the power arm or decreasing the load arm. To increase the mechanical advantage, we need to increase the force arm and decrease the load arm.

Decreasing incline increases mechanical advantage. However, the load has to travel long distances. The ideal mechanical advantage of an incline is the length of the incline divided by the vertical incline which is called the run-to-elevation ratio. Moving the fulcrum closer to the load increases the mechanical advantage. -Moving power away from the pivot increases mechanical advantage.

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Answer: It's B, Move the fulcrum closer to the clay block.

Explanation: I took the test.

The slope of the graph of the equation at the point (20, 2) is 1/8.

To find the slope of the graph of the equation at the given point (20, 2), we need to find the derivative of the equation with respect to x and evaluate it at x = 20. Let's differentiate the equation implicitly:

xy - 9y^2 = 4

To differentiate implicitly, we treat y as a function of x and apply the chain rule. Differentiating both sides of the equation with respect to x:

1 * y + x * dy/dx - 9 * 2y * dy/dx = 0

Simplifying this equation:

y + x * dy/dx - 18y * dy/dx = 0

Grouping the terms with dy/dx:

dy/dx * (x - 18y) = -y

Now, let's solve for dy/dx by dividing both sides by (x - 18y):

dy/dx = -y / (x - 18y)

Substituting the given point (20, 2) into the equation:

dy/dx = -2 / (20 - 18(2))

         = -2 / (20 - 36)

         = -2 / (-16)

         = 1/8

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Answer:

9.9 m/s

Explanation:

To solve this problem, we can use conservation of energy. At point A, the box has potential energy due to its position on the hill. As it rolls down the hill, this potential energy is converted into kinetic energy, which the box has at point B.

The potential energy of the box at point A is given by mgh, where m is the mass of the box, g is the gravitational acceleration, and h is the height of the box above some reference level. The height difference between points A and B is 5 meters, so the potential energy at point A is mgh = 10.0 kg * 9.8 m/s^2 * 15 m = 1470 J.

At point B, all of the potential energy at point A has been converted into kinetic energy. The kinetic energy of the box is given by (1/2)mv^2, where m is the mass of the box and v is its velocity. Equating the potential and kinetic energies, we have:

mgh = (1/2)mv^2

Solving for v, we get:

v = sqrt(2gh)

Plugging in the values, we get:

v = sqrt(2 * 9.8 m/s^2 * 5 m) = 9.9 m/s

Therefore, the velocity of the box when it reaches point B is 9.9 m/s.

ALLEN

The motorcycle is likely to appear farther away than it actually is because it is smaller in size than your car. This phenomenon is known as the size-distance illusion, where our brains tend to perceive smaller objects as farther away, even if they are not. This is because our brain assumes that larger objects are closer and smaller objects are farther away.

Moreover, the visual angle of the motorcycle, which is the angle that the motorcycle subtends on your eye, is smaller than that of your car due to its smaller size. Hence, our brain interprets this smaller visual angle as an indication that the motorcycle is farther away than it actually is.

As a driver, it is crucial to be aware of this illusion and take necessary precautions while turning or changing lanes to avoid accidents with smaller vehicles such as motorcycles. One should always check their surroundings thoroughly and double-check before making a move.

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Answer:

If one plays ice hockey he should must have necessary equipment to support his sport. These equipment include Ice Skates,Helmet with Cage and Mouth-guard:, Hockey stick, Hockey pants,Hockey gloves, shoulder pads, elbow pads, Shin Guard:Neck guard and Jockstrap (men) or Pelvic protector (women)

Explanation:

Answer:

If one plays ice hockey he should must have necessary equipment to support his sport. These equipment include Ice Skates,Helmet with Cage and Mouth-guard:, Hockey stick, Hockey pants,Hockey gloves, shoulder pads, elbow pads, Shin Guard:Neck guard and Jockstrap (men) or Pelvic protector (women).

The concepts required to solve the problem are Amperes law and Biot-savart law.

According to Amperes law, "the sum of the length elements times the magnetic field is permeability times the electric current enclosed in the loop".

\($$\oint \vec{B} \cdot \overrightarrow{d s}=\mu_{0} I$$\)

Here,

is the magnetic field,

\(\vec{B}$$\)

is the length element,

\($$\overrightarrow{d s}$$\)

is the permeability of free space and

is the current.

\($$B=\int \frac{\mu_{0} I d \vec{l} \times \hat{r}}{4 \pi r^{2}}$$\)

Here,

is the length element,

is the unit vector, and

is the distance of the point from the wire.

Amperes law equation is as follows:

\($$\oint \vec{B} \cdot \overrightarrow{d s}=\mu_{0} I$$\)

If the loop has

\($N$\)

turns and

\($2 \pi r$\)

is substituted for

\($\overrightarrow{d s}$\)

the magnetic field can be calculated below:

\($$\begin{gathered}\oint \vec{B} \cdot \overrightarrow{d s}=\mu_{0} N I \\B(2 \pi r)=\mu_{0} N I \\B=\frac{\mu_{0} N I}{2 \pi r}\end{gathered}$$\)

What is magnetic field ?

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The linear expansivity of the metal is 4.44 × \(10^{-6}\) /°C.

What is Temperature?

Temperature is a measure of the degree of hotness or coldness of a substance or object, expressed in terms of a numerical scale. It is a physical property that determines the direction of heat transfer between two bodies in thermal contact. The most commonly used scales for temperature measurement are Celsius, Fahrenheit, and Kelvin.

Linear expansivity is defined as the change in length per unit original length per degree Celsius change in temperature.

Let the initial length of the metal be L1 = 15.01 m and the change in temperature be ΔT = 60°C.

The final length of the metal is L2 = 15.05 m.

The change in length of the metal is:

ΔL = L2 - L1

ΔL = 15.05 m - 15.01 m

ΔL = 0.04 m

The linear expansivity α can be calculated as:

α = ΔL / (L1 ΔT)

α = 0.04 m / (15.01 m × 60°C)

α = 4.44 ×\(10^{-6}\) /°C

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The spacetime Using Lorentz transformation equation coordinates in the moving frame are (1303.93 m, 3.01 s).

Given information:

An event has spacetime coordinates (x,t)=1,300 m,3.0 s in reference frame S.What are the spacetime that moves in the negative x - direction at 0.03c?We know that the coordinates of the same event as observed from two different inertial frames are related by the Lorentz transformation equations.

Using Lorentz transformation equation:(x', t') = (γ(x − vt), γ(t − vx/c²))where γ = 1/√(1−v²/c²) represents the Lorentz factor, x is the position in the stationary frame, t is time in the stationary frame, x' is the position in the moving frame, t' is time in the moving frame, v is the relative velocity between the two frames and c is the speed of light in vacuum.We are given,x = 1,300 mt = 3.0 s, v = −0.03c (since the motion is in the negative x direction)∴ γ = 1/√(1−v²/c²) = 1/√(1−0.03²) = 1/0.997

The spacetime coordinates in the moving frame, (x', t') = (γ(x − vt), γ(t − vx/c²))= [1/0.997 (1300 - (-0.03c)(3.0))] m, [1/0.997 (3.0 - (-0.03c)(1300)/c²)] s= (1303.93 m, 3.01 s) [correct to 2 decimal places]

Therefore, the spacetime coordinates in the moving frame are (1303.93 m, 3.01 s).

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If a 15-g marble is dropped from rest onto the floor 1.4 m below and the marble bounces straight upward to a height of 0.64 m, the magnitude of the impulse delivered to the marble by the floor is 0.312 N s

v² = u² + 2 a s

v = Final velocity

u = Initial velocity

a = Acceleration

s = Distance

During downward motion,

s = - 1.4 m

a = 9.8 m / s²

u = 0 ( Since it is dropped and not thrown )

v² = 0 + ( 2 * 9.8 * - 1.4 )

- v² = 27.44

v = - 5.24 m / s

During upward motion,

s = 0.64 m

a = - 9.8 m / s

v = 0  

- u² = 0 + ( 2 * - 9.8 * 0.64 )

u² = 12.544

u = 3.54 m / s

u = 3.54 m / s

J = m Δv

J = Impulse

m = Mass

Δv = Change in velocity

Δv = Initial velocity of upward motion - Final velocity of downward motion

Δv = 3.54 - ( - 5.24 )

Δv = 8.78 m / s

m = 15 g = 0.015 kg

J = 0.015 * 8.78

J = 0.312 N s

Therefore, the impulse delivered to the marble by the floor is 0.312 N s

The given question is incomplete. The complete question is:

A 15-g marble is dropped from rest onto the floor 1.4 m below. If the marble bounces straight upward to a height of 0.64 m, what is the magnitude of the impulse delivered to the marble by the floor?

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Answer:

Charges B and C are negative

Explanation:

• We are certain of a law of magnetism that states "Field lines move from positive charge to negative charge"

\({}\)

Answer:

B and C are negative.

Explanation:

This is because according to the law of charges in electric field line it says that the lines forming the electric field move from the positive terminal to the negative terminal,hence making B and C be negative as the lines are moving into them.

Answer:

C. It is made from three layers of semiconductors.

Explanation:

Bipolar transistors (pnp and npn) are usually made from a sandwich of three semiconductors layers. The main charge carriers are holes and electrons. An npn transistor has two semiconductor junctions that share a thin middle positively enhanced region (the material is enhanced with impurities rich in holes which are the positive charge carriers), and a pnp transistor has two semiconductor junctions that share a thin middle negatively enhanced region (material is enhanced with impurities rich in electrons, the negative charge carriers).

Answer:

C. It is made from three layers of semiconductors

Explanation:

Edge 2021

(a) Push down harder on the pedals of a bicycle when first starting out than when moving at constant speed it is because of the 1st and 2nd law of motion.

(b) Need to pedal at all when cycling at constant speed because bicycle slows down and comes to rest due to the frictional force.

Unless acted on by an unbalanced force, an object at rest remains at rest, while an object in motion continues in motion at constant speed and in a straight path. The acceleration of an item is determined by its mass and the amount of force applied.

Use Newton's First and Second Law of Motion:

(a) The bicycle is at rest initially, in order to accelerate from rest, the net force must be greater than zero. When moving at constant speed net force equal to zero. Now when first starting to move it is necessary to overcome the static friction which is larger than kinetic friction.

(b) The net force acting on the object moving with constant speed is zero. So on bicycle also the net force is zero with constant speed. The bicycle slows down and comes to rest due to the frictional force. So at constant speed bicycle needs to be paddled when cycling.

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Answer:

Poverty, land shortage, increasing population

Explanation:

the SI unit of energy is the joule (J) . the joules has base units of kg•m^2/s^2=N•m. A joule is defined as the work done or energy required to exert a force of one Newton for a distance of one metre.

hope this helps you

For a multi-body system, the location of the center of mass (COOM) is not fixed and can change depending on the positions and masses of the individual bodies.

This is because the position of the COM depends on the distribution of mass within the system and the relative positions of the bodies in the system. As the bodies move or interact with each other, the distribution of mass and their relative positions can change, causing the COM to shift accordingly.

The center of mass is the average location of the mass in the system, and it can be calculated using the formula:

COOM = (m1r1 + m2r2 + ... + mn rn) / (m1 + m2 + ... + mn)

where m1, m2, ..., mn are the masses of the bodies and r1, r2, ..., rn are the positions of their centers of mass relative to some reference point. The center of mass is an important concept in physics, as it can help us understand how a system will move and behave under different conditions.

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Answer:

It means that person can do work or can posses energy at a rate of 550 watts.

Or : can posses energy of 550 joules in one second.

Explanation:

\({ \bf{power = \frac{work}{time} }}\)

The radius of the curve that the plane follows in making the turn is approximately 275.87 meters.

To find the radius of the curve that the plane follows in making the turn, use the relationship between the speed, radius, and time for an object moving in a circular path.

Given:

Velocity of the airplane (v) = 115 m/s

Time taken to complete the turn (t) = 15 seconds

The formula to calculate the radius (r) of the curve is:

r = v × t / (2 × π)

Substituting the given values into the formula:

r = 115 m/s × 15 s / (2 × π)

Calculating the value:

r ≈ 115 × 15 / (2 × 3.14159)

r ≈ 115 × 15 / 6.28318

r ≈ 275.8686 meters

Therefore, the radius of the curve that the plane follows in making the turn is approximately 275.87 meters.

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Answer:

These layers are the troposphere, the stratosphere, the mesosphere and the thermosphere.

A further region, beginning about 500 km above the Earth's surface, is called the exosphere.

Explanation:

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The maximum height above the surface of the planet that the rock will reach is approximately 1.7 m.

When the rock is thrown upward on the planet, neglecting air resistance, it will reach a maximum height of approximately 1.7 m above the surface. This calculation can be determined using the kinematic equations, taking into account the planet's radius (105 m) and mass \((10^2^1 kg)\).

The gravitational acceleration on this planet will be different from 10 m/s² due to its mass. By applying the appropriate kinematic equations and considering the initial velocity of 10 m/s, we can determine the maximum height attained by the rock. Neglecting air resistance, the rock will reach a height of approximately 1.7 m above the planet's surface.

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Answer:

Because it is more electronegative than nitrogen.

Explanation:

Oxygen has greater force of attraction between it's Molecules than nitrogen because it is more electronegative than nitrogen and this is because it has more slightly charged positive protons in it's electrons and thus make it slightly negative in it's nucleus. It has 8 electrons in it's nucleus compare to 7 electrons nitrogen has and this will make a bonding pair to occur in oxygen than nitrogen.

Answer:

First blank:

reflected

Second blank:

absorbed

third blank:

Transparent

fourth blank:

transmitted

fifth blank:

light

sixth blank:

optic

seventh blank:

path

eighth blank:

frequency

Explanation:

The average force exerted by the club on the ball is 838,400 N. Force can be characterized by its magnitude, direction, and point of application.

It can be a push or pull, and it can cause an object to start moving, stop moving, or change its direction of motion.

Force is indeed a physical factor that alters or has the potential to alter an object's state at rest or motion as well as its shape. Newton is the SI unit of force.

Finally, the average force exerted by the club on the ball is:

F = I / t = (1676.8 N·s) / (0.0020 s) = 838,400 N

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The relationship between the speed and height of the three balls is that; each ball will have the same speed.

What is the relationship between speed and height?

We are given that;

Three balls are thrown from a cliff with same speed

Ball A is thrown in the horizontal direction.

Ball B starts out at 45° above the horizontal.

Ball C begins its flight at 45° below the horizontal

From law of conservation of energy, we know that potential energy is equal to kinetic energy. Thus;

mgh = ¹/₂mv²

v = √2gh

Therefore, the speed is directly proportional to the height and as such since the three balls have the same height, their speeds will be the same.

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[NOTE : THIS IS AN INCOMPLETE QUESTION. THE COMPLETE QUESTION IS:

Three balls are thrown off a cliff with the same speed but in different directions. Ball A is thrown in the horizontal direction; ball B starts out at 45° above the horizontal; ball C begins its flight at 45° below the horizontal. Which ball has the greatest speed just before it hits the ground? Assume that the ground near the building is level, and ignore any effects due to air resistance.]

Answer:

it can be called PE or sometimes, there are equations which you can use the letter U.

Explanation:

Answer:

STORED ENERGY

Explanation: