If two vectors are perpendicular to each other, their cross product must be zero.

a. Trueb. False

Answers

Answer 1

a. True If two vectors are perpendicular to each other, their cross product must be zero.

Their cross product is 0 when two vectors are perpendicular, right?

The vector is always equal to its cross-vector product. A line that is perpendicular to another line will create an angle of 900 degrees between them. As a result, even if two provided vectors are perpendicular, their cross product does not equal zero, but their dot product does.

A 90 degree angle is created between two vectors when they are perpendicular to one another. As we all know, the cross product of two vectors is equal to the product of the magnitudes of the vectors and the sine of the angle between them.

The dot product of two vectors that are perpendicular to one another is equal to zero.

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Related Questions

Hellpppppp
1.39 A of current flow across a
144 Ohm resistor. How much
voltage is being applied?

Hellpppppp1.39 A of current flow across a144 Ohm resistor. How muchvoltage is being applied?

Answers

V = 200.16 volts

Explanation:

V= IR

= (1.39 A)(144 ohm)

= 200.16 volts

Answer:

200.16

Explanation:

acellus

What happens to the magnet on top of another magnet?

Answers

Similar like magnets, opposites are drawn together. A magnet's north pole will adhere to another magnet's south pole. However, a magnet's north pole will push away from another magnet's north pole.

The basic adage "opposites attract" applies to magnets. Every magnet has a north and a south pole. The drawing together of two poles that are incompatible with one another. If you attempt to align the north and south poles in these directions, they will reject one another.The magnets are surrounded by an invisible magnetic field that is filled with potential energy. When two poles with similar sides are attempted to be pushed together, the built-up energy transforms into motion, or kinetic energy, and pushes the poles apart.

When two diametrically opposed poles combine, the same logic applies. The magnets are compelled to come together because of the intense attraction.

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what is the electric potential at a point in space if a charge of 7.3x 10^-17 coulombs at that point has a potential energy of 6.4

Answers

Answer:

V = 0.87 volt

Explanation:

Given that,

Charge, \(q=7.3\times 10^{-17}\ C\)

Electric potential energy, \(U=6.4\times 10^{-17}\ J\)

We need to find the value of electric potential at a point. The relation is as follows :

\(V=\dfrac{U}{q}\)

Where

V is electric potential

So,

\(V=\dfrac{6.4\times 10^{-17}}{7.3\times 10^{-17}}\\\\V=0.87\ V\)

So, the value of the electric potential at a point is equal to 0.87 Volts.

Describe how and where distribution changes

Answers

Distribution changes can occur through processes like diffusion, mixing, phase changes, chemical reactions, and external factors, leading to alterations in the spatial arrangement or dispersion of a substance.

The distribution of a substance can change in various ways depending on the specific scenario and factors involved. Here are a few examples of how and where distribution changes can occur:

Diffusion: Distribution can change through the process of diffusion, where molecules or particles move from an area of higher concentration to an area of lower concentration. This can result in a more even distribution of the substance throughout a given space.

Mixing: Distribution changes can occur when substances are mixed together. For example, if two liquids or gases with different compositions are combined, they can mix to form a uniform distribution.

Phase changes: When a substance undergoes a phase change, such as melting, evaporation, condensation, or solidification, the distribution can change. For instance, as a liquid evaporates, the molecules transition from a condensed phase to a dispersed phase, leading to changes in the distribution.

Chemical reactions: Distribution changes can also occur during chemical reactions. Reactants may combine to form new products, leading to a redistribution of the elements or compounds involved.

External factors: External factors such as temperature, pressure, and external forces can influence the distribution of substances. For example, changes in temperature or pressure can affect the solubility of a substance, leading to changes in its distribution between different phases (e.g., solid, liquid, gas).

Therefore, The specific location or area where the distribution changes depend on the nature of the system and the factors driving the change. It could occur throughout a container, in a specific region within a solution, or within a confined space where diffusion or mixing is taking place. The extent and pattern of the distribution change will depend on the conditions and mechanisms involved in the process.

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Why is rust formed on iron

Answers

When iron is exposed to moisture and oxygen it starts to rust.

Why would placing two very strong magnets in the middle of two separate balloons provide a good model for nuclear fusion?

Answers

Answer:

because the friction in the baloons and the magnetism make it like nuclear fision

Explanation:

The magnetic field and friction between the balloons when placing two very strong magnets in the middle of two separate balloons provide a good model for nuclear fusion.

What is nuclear fusion?

Nuclear fusion is the process through which light elements interact to create heavier elements (up to iron). Significant amounts of energy are released when interacting nuclei are from elements with low atomic numbers, such as hydrogen (atomic number 1) or its isotopes deuterium and tritium.

Thermonuclear weapons, or hydrogen bombs, which were created in the decade immediately following World War II, were the first to utilize the tremendous energy potential of nuclear fusion.

There are two main categories of fusion reactions: those that maintain the ratio of protons to neutrons and those that convert protons to neutrons.

Therefore, the magnetic field and friction in the balloons when placing two very strong magnets in the middle of two separate balloons provide a good model for nuclear fusion.

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Jocelyn is running for the U.S Senate. What is one of the qualifications for office she must meet?


have resided in the United States for at least 10 years


have served as Governor of the state she will represent.


reside in the state she will represent


have been a member of the U.S. House of Representatives

Answers

Answer:

b

Explanation:

Answer:

Reside in the state she represents.

Explanation:

Every position in government needs at least one qualification. she needs to reside in the state she represents because U.S Senators represent their state witht he views and stuff.

Hope this helps :)

Do machines create less work? Example: pulley system

Answers

Answer:

Technically, no the work of building machines is hard but in the long run, Yes they are easier after they're built.

Explanation:

A 50,000 kg train is rolling on its own down the track at 5 m/s. You grab the rope trailing behind it, and exert a stopping force of 2000 N. How long does it take to stop the train?

Answers

Answer:

t = 125 seconds

Explanation:

Given that,

The mass of a train, m = 50,000 kg

Initial speed, u = 5 m/s

Stopping force, F = 2000 N

We know that,

Force, F = ma

Where

a is acceleration

\(F=\dfrac{m(v-u)}{t}\\\\t=\dfrac{m(v-u)}{F}\\\\t=\dfrac{50000(0-5)}{-2000}\\\\t=125\ s\)

So, it will take 125 seconds to stop the car.

Five workers from the same factory developed angiosarcoma, a rare cancer of the veins and arteries. Which part of the scientific method is this? Group of answer choices conclusion experiment observation none of these hypothesis

Answers

Answer:

a

Explanation:

i took the test

Five workers from the same factory developed angiosarcoma, a rare cancer of the veins and arteries. This is observation of the scientific method.

What is scientific method?

Since at least the 17th century, the scientific method—an empirical approach to learning—has guided the advancement of science. Since one's interpretation of the observation may be distorted by cognitive presumptions, it requires careful observation and the application of severe skepticism regarding what is observed.

It entails developing hypotheses through induction based on these observations, testing the validity of those hypotheses through experimental and measurement-based statistical testing of the inferences made from them, and then fine-tuning (or discarding) those hypotheses in light of the experimental results.

These are the guiding principles of the scientific process, as opposed to a predetermined set of steps that apply to all scientific endeavors.

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A car goes 15 miles at 45mph, then goes another 15 miles at 30mph. a. How long does the trip take? b. What is the average speed for the whole trip?

Answers

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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What is a supply chain designed to optimize both forward and reverse flows?
a. open-loop supply chain
b. closed-loop supply chain
c. bullwhip-loop supply chain
d. reverse-loop supply chain

Answers

The correct option is b. closed-loop supply chain

Closed-loop supply chain is designed to optimize both forward and reverse flows.

What is closed-loop supply chain?

Businesses recycle their waste volume to make new products in such a closed-loop supply chain. This method of resource conservation and energy conservation is sustainable.

Some characteristics of closed-loop supply chain are-

Although there are many natural resources on the planet, such as freshwater and oil, they are limited and will eventually run out. Fortunately, numerous governments all across the world have created and put into effect ways to lessen resource waste.Likewise, companies can contribute to the preservation of natural resources by implementing the closed-loop supply chain (CLSC). The appeal of a CLSC or negligible supply chain is that it centers on material reuse, composting, and recycling. As a result, the closed-loop supply chain encourages manufacturers to come up with creative uses for End-of-Life (EOL) products rather than disposing of them in landfills.

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Choose the nonmetallic elements from the list. Check all that apply.

Yttrium
Oxygen
Boron
Polonium
Argon
Gallium
Carbon

Answers

Answer:

Oxygen, Argon, Carbon

edge2020

Answer:

carbon, oxygen, argon,

Explanation:

:)

by convention, when we graphically display a sound wave, what does the horizontal x-axis represent, and what does the vertical y-axis represent?

Answers

The horizontal x-axis represents the frequency and the vertical y-axis represents the amplitude of sound waves in a graph.

Visually, sound waves are represented as a waveform with the x-axis denoting time and the y-axis denoting amplitude. Sound waves do various tasks. On these graphs, there is one y and one x. A waveform can be used to analyse the frequency (pitch) and amplitude ('loudness' or intensity) of a sound.

The number of cycles on a periodic waveform with a repeating pattern can be used to compute frequency. The frequency and perceived pitch increase with the number of cycles per second. Hertz is typically used to express frequency (Hz). By examining a waveform's amplitude, we may determine how loud or strong a sound is as well as how much the airborne particles oscillate. Traditionally, decibels are used to express it (dB).

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If an object free-falls for t seconds from rest to d distance, how far will the object fall from rest in twice the elapsed time?

Answers

Answer:

When the time of fall is doubled, the height of fall will be quadrupled

Explanation:

Given;

height of fall, h = d m

time of fall, t = t s

initial velocity of the object, u = 0 m/d

The height of fall of the object is calculated from the kinematic equation below;

\(h = ut + \frac{1}{2} gt^2\\\\h = 0 + \frac{1}{2} gt^2\\\\h = \frac{1}{2} gt^2\\\\2h = gt^2\\\\g = \frac{2h}{t^2}\)

where;

g is acceleration due to gravity, which is constant

if the time of fall is doubled, the height of fall is calculated as;

\(\frac{2h_1}{t_1^2} = \frac{2h_2}{t_2^2} \\\\\frac{h_1}{t_1^2} = \frac{h_2}{t_2^2}\\\\(Note: h_1 = d, \ and \ t_1 = t)\\\\h_2 = \frac{h_1t_2^2}{t_1^2} \\\\h_2 = \frac{(d)(2t_1)^2}{t_1^2} \\\\h_2 = \frac{(d)(2t)^2}{t^2}\\\\h_2 = \frac{(d)\times 4t^2}{t^2}\\\\h_2 = 4d\)

Therefore, when the time of fall is doubled, the height of fall will be quadrupled

two balls are launched simultaneously from the same position with an initial velocity of 3 meters per second, one at angle 30 degrees and one at angle 45 degrees, over a deep pit. what time will the horizontal distance between them exceed 2 meters?

Answers

The time when the horizontal distance between the two balls exceeds 2 meters is approximately 4.19 seconds.

To find the time when the horizontal distance between the two balls exceeds 2 meters, we can analyze the horizontal motion of each ball separately.

For the ball launched at an angle of 30 degrees, the horizontal component of its initial velocity is given by Vx = V * cos(theta), where V is the initial velocity and theta is the launch angle. In this case, Vx = 3 * cos(30) = 3 * √3 / 2 = 2.598 m/s.

For the ball launched at an angle of 45 degrees, the horizontal component of its initial velocity is given by Vx = V * cos(theta). In this case, Vx = 3 * cos(45) = 3 * √2 / 2 = 2.121 m/s.

Since both balls have the same initial horizontal velocity, we can determine the time when their horizontal distances exceed 2 meters by using the equation:

distance = velocity * time

For the ball launched at 30 degrees, the distance covered after time t is given by d1 = Vx * t.

For the ball launched at 45 degrees, the distance covered after time t is given by d2 = Vx * t.

To find the time when the horizontal distance between them exceeds 2 meters, we set d1 - d2 > 2:

Vx * t - Vx * t > 2

2.598t - 2.121t > 2

0.477t > 2

t > 2 / 0.477

t > 4.19 seconds

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Most metallic elements, such as copper
and iron, have high melting points. This
is a useful property because

F. it keeps cars made of metal from
becoming hot on summer days

G. it enables people to use pots and pans
made of metal to cook food

H. it prevents machine parts made of
metal from rusting

J. it makes metals easier to melt so they
can be poured into molds to make
precision tools

Answers

Answer:

G. it enables people to use pots and pans made of metal to cook food

Explanation:

Metals are known to be substances with a relative high melting point, which means that it takes a very high temperature to melt them. As used in this question, copper (Cu) and iron (Fe) at metallic elements that have high melting points.

One advantage of this property based on the options provided is that "it enables people to use pots and pans made of metal to cook food". This is because cooking food requires subjecting them to a constant temperature from a heat source e.g cooker or stove.

The material used to hold the food being cooked must possess a very high melting point to withstand the heat, hence, the importance of these metallic substances. Most pots and pans are made of steel, an alloy of iron, hence, they have high melting point.

An object is moving to the right at a constant velocity. What will happen if a force of 20 n starts acting on it in the opposite direction?.

Answers

If a force of 20 n begins acting on the object in the opposite direction, its velocity will rise.

What happens when things are moving at a constant speed?

If there are no forces acting to accelerate or decelerate an object that is already moving with a constant speed, it will continue to move at that speed in a straight line. By defining force as a vector quantity, Newton helped to clarify the aforementioned statement.

Newton's first law of motion states that any object moving at a constant speed experiences no net external forces, so the total amount of forces acting on the object must be zero.

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Not really understanding this, wouldn't mind some help. : )

Not really understanding this, wouldn't mind some help. : )

Answers

Explanation:

Given

Mass (m) = 1200 kg

Acceleration (a) = 3 m/s²

Force (F) = ?

We know

F = m * a

= 1200 * 3

= 3600 Newton.

Therefore the force acting on the car is 3600 Newton.

Hope it will help):)

Part E
List several examples of drag, elastic force, and tension force that you've observed in your life.

Answers

Various examples of drag, elastic and tension forces are mentioned.

What is elastic and tension force?

Elastic force is a type of force that occurs when an object is stretched or compressed, and it resists the deformation of the object. This force is proportional to the amount of stretching or compression, and it causes the object to return to its original shape when the force is removed.

Tension force is a type of force that is transmitted through a string, rope, wire or cable when it is pulled tight by forces acting at either end. This force acts to transmit the tension through the length of the string, keeping it taut and preventing it from breaking.

What is an example of drag that is observed in life?

A person biking into a headwind experiences air resistance, which is a type of drag force.

What is an example of elastic force observed in life?

A stretched rubber band or a compressed spring both exhibit elastic force.

What is an example of tension force observed in life?

A person pulling a wagon by a rope exerts a tension force on the rope. Another example of tension force can be observed when a weight is hung from a rope or chain, creating tension within the rope or chain.

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6. Sandy adds 3 sugar packets to her tea in order to make it sweeter. She stirs in the sugar and then takes a sip. She notices that not all the sugar was dissolved. What type of solution did she make?

A. Saturated B.Unsaturated C.Supersaturated D.Mildly saturated

Answers

Answer:

C.Supersaturated

Explanation:

There are three types of solution:

SATURATED SOLUTION:

It is the solution that contains maximum amount of solute dissolved in a solution in normal conditions.  

UNSATURATED SOLUTION:

It is the solution that contains less than the maximum amount of solute dissolved in a solution in normal conditions. It has space for more solute to be dissolved in it.

SUPERSATURATED SOLUTION:

It contains more than the maximum amount of solute dissolved in it. Such a solution has no capacity to dissolve any more solute under any conditions.

Since the sugar is no more dissolving in the tea and has settled down. Therefore, the solution is:

C.Supersaturated

When in use, a lamp is designed to draw
a current of 0.6 A from the car's 12 V battery. The resistance of
this lamp must be approximately...

Answers

Answer:

R=∆V/I=12/0.6=20ohm....

88 L + 120 dL = _____________ L?

Answers

Answer:

100 L

Explanation:

10 dL =  1 L

A capacitor is connected into a 277-v, 400-hz circuit. the circuit current is 12 a. what is the capacitance of the capacitor?

Answers

A capacitor is connected to a 277-v, 400-Hz circuit. the circuit current is 12 a. 1.72x 10⁻⁵ F is the capacitance of the capacitor.

Voltage V = 277 V

Frequency f = 400 Hz

Current = 12 A.

A capacitor, a device for storing electrical energy, consists of two closely spaced insulated conductors. A simple example of such storage is a plate capacitor. Voltage refers to the potential difference between two points.

Capacitors are electrical components that extract and store energy from batteries. Internally, the connector connects to two metal plates separated by a non-conductive material. When activated, the capacitor instantly and rapidly releases electricity.

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How can toxic shock syndrome be prevented?

Answers

Answer:

What is the best way to avoid toxic shock syndrome? During menstrual periods, consider switching to sanitary pads instead of tampons, or sleeping with pads. Changing from tampons to pads every other day or during periods of heavy menstrual flow can also assist to lessen risk. Hope this helps :)

The force that pulls falling objects toward Earth is called *
gravity
free fall
acceleration
air resistance

Answers

Answer:

Gravity

Explanation:

That's easy because gravity is the only thing that can pull us down that hard at that fast without anything helping it.

A sphere of radius r0 = 23.0 cm and mass = 1.20 kg starts from rest and rolls without slipping down a 33.0 degree incline incline that is 12.0 m long.
1.Calculate its translational speed when it reaches the bottom.
v=______________m/s
2. Calculate its rotational speed when it reaches the bottom.
w=_____________________ rad/s
3.What is the ratio of translational to rotational kinetic energy at the bottom?

Answers

So the ratio of translational to rotational kinetic energy at the bottom is 94.3. a. \(KE_t = (1/2)mv^2\)  b. \(KE_r = (1/2)Iw^2\)

The conservation of energy principle. The initial potential energy is converted to both translational and rotational kinetic energy at the bottom of the incline.

The potential energy at the top of the incline is:

PEi = mgh = (1.2 kg)(9.81 \(m/s^2\))(12.0 m)sin(33.0°) = 62.6 J

At the bottom of the incline, the translational kinetic energy and rotational kinetic energy are:

\(KE_t = (1/2)mv^2\\KE_r = (1/2)Iw^2\)

Since the sphere is rolling without slipping, we know that the translational speed is related to the rotational speed as v = rw, and the moment of inertia is I = (2/5)\(mr_0^2.\)

Using conservation of energy, we have:

\(PE_i = KE_t + KE_r\\62.6 J = (1/2)mv^2 + (1/2)(2/5)mr0^2w^2\\62.6 J = (1/2)(1.2 kg)v^2 + (1/5)(1.2 kg)(0.23 m)^2w^2\\62.6 J = 0.6v^2 + 0.006 w^2\)

We can solve for the rotational speed as w = \(\sqrt{[(62.6 J - 0.6v^2)/0.006(0.23 m)^2].}\)

The ratio of translational to rotational kinetic energy at the bottom is:

KEt/KEr = \((1/2)mv^2/[(1/2)(2/5)mr0^2w^2]\\\\= 5v^2/(2r_0^2w^2)\\= 5/(2 * 0.23^2) = 94.3\)

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A 10 kg rock is suspended 320 m above the ground.
What is its kinetic energy before it is released?
K.E. =

Answers

Answer:

it is a mass of an object that increases to a kinetic energy.

Explanation:

Answer:

\(k=0J\)

Explanation:

Kinetic Energy formula:

\(K=\frac{1}{2} (m)(v^2)\)

The rocks suspended 320 m above ground. The rock is not in motion. The speed of the rock is zero.

Using the formula:

\(K=\frac{1}{2} (m)(0^2)\)

\(K=0J\)

If passenger comfort requires that acceleration should be no greater in magnitude than 0.10 g., what distance is required to stop the car if its speed is initially 30 m/s? What force is required?
I have the answer but I want to know how to get the answer. Please write out all the steps and assume I have never taken a physics course before. No calculus this is a physics without calculus course.

Answers

The maximum force that the car can experience before exceeding the maximum acceleration of 0.10 g is approximately 9.81 times the mass of the car.

What is SI unit of force?

The maximum force that the car can experience before exceeding the maximum acceleration of 0.10 g is in newtons, since force is measured in newtons (N) in the International System of Units (SI).

\(v = u + at\\s = ut + 1/2 at^2\\v^2 = u^2 + 2as\)

We know that the initial velocity is 30 m/s and the acceleration should be no greater in magnitude than 0.10 g, which is \(9.81 m/s^2\) multiplied by 0.10, or \(0.981 m/s^2\).

Step 1: Calculate the stopping time

\(0 = 30 - 0.981t\\t = 30 / 0.981\\t = 30.57 s\)

Step 2: Calculate the stopping distance

\(s = 30 * 30.57 + 1/2 * -0.981 × (30.57)^2\\s = 463.85 m\)

Step 3: Calculate the force required to stop the car

\(F_max = m * a_max\\F_max = m * 0.981\)

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(8.62 x 10-2) - (1.94 x 10-2)

Answers

Answer:

66.8

Explanation:

hope this helps

Answer:

66.8

Explanation:

\((8.62 \times 10 - 2) - (1.94 \times 10 - 2)\)

Follow the PEDMAS order of Operation

\(8.62 \times 10 - 2 - 1.94 \times 10 + 2 \\ 86.2 - 2 - 19.4 + 2 \\ 86.2 - 2 - 17.4 \\ = 66.8\)

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