An automobile travels on a straight road at 30 km/h How long will it take to travel 40 km

Answer:

the required tension is 4.57 N.

Explanation:

Given;

first velocity of the wave, v₁ = 24 m/s

first tension on the string, T₁ = 5.34 N

second velocity of the wave, v₂ = 22.2 m/s

second tension of the string, T₂ = ?

[tex]v = \sqrt{\frac{T}{\mu} }[/tex]

where;

μ is mass per unit length

[tex]v^2 =\frac{T}{\mu} \\\\\mu = \frac{T}{v^2} = \frac{T_1}{v_1^2} = \frac{T_2}{v_2^2} \\\\T_2 =\frac{T_1v_2^2}{v_1^2} \\\\T_2 = \frac{5.34 \times 22.2^2}{24^2} \\\\T_2 = 4.57 \ N[/tex]

Therefore, the required tension is 4.57 N.

Answer:

distance is a scalar quantity, it only has a magnitude, not direction

displacement is a vector quantity, it has both magnitude and direction

for example, 20m North -------> is a vector quantity, it shows direction

20m -----------> is a scalar quantity, it has not direction

Explanation:

Answer:

Torque is one of the key ideas to comprehend in order to solve problems with rotational motion. Torque is the tendency of a force to produce or change rotational motion.

Torque is a measure of an engine's capacity to control a load and generate a certain level of power to turn the engine on its axis. which is an important part of an automobile engine's power-generating process. Per foot (ft) of rotation about a single point, the force is expressed in pounds (lb).

The force that can cause an object to revolve around an axis is measured in torque. In linear kinematics, force causes an item to accelerate, and torque causes an object to produces the angular acceleration of an object. A vector quantity is a torque.

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Answer:

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More p recisely, one light-year is equal to 9,500,000,000,000 kilometers

The proposed size of 10 miles long and 5 miles in diameter for such a colony is quite large and would require significant technological advancements in terms of materials, and construction to be feasible.

In general, a spinning cylinder produces lift when its top and bottom are subjected to higher pressure and quicker velocities, respectively. The lifting force, it was said, is pointed perpendicular to the cylinder velocity.

If r is an object's radius, v is its linear speed and is its angular velocity in radians per unit of time, then v = r. This formula connects these three values so that we can always determine the third if we know the first two.

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Answer:

C

Explanation:

edge2020

1.7×10^2 m

The student was 1.7×10^2 m far from the speaker.

The distance that sound waves travel is mostly influenced by the temperature and pressure of the ocean, even though sound travels through water at a far faster rate than it does through air.

The change in pressure that a sound wave causes when it is measured at a particular location is related to the amplitude of the wave. If the amplitude grows, the sound is heard as louder, and if it drops, it is heard as quieter.

The pace at which a wave moves has nothing to do with its amplitude. Waves A and B move forward at the same speed. Only changes in the characteristics of the medium a wave travels through can change its speed.

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To calculate the distance between the loudspeaker and the student, we can use the speed of sound in air, which is approximately 340 meters per second (m/s) at standard temperature and pressure (STP).

The formula to calculate distance is:

distance = speed x time

where distance is the distance between the loudspeaker and the student, speed is the speed of sound in air, and time is the delay that was observed between the time the sound wave left the loudspeaker and the time it reached the student.

distance = 340 m/s x 0.50 s

distance = 170 m

So, the distance between the loudspeaker and the student is 170 meters.

This answer corresponds to (2) 91.7 x 102m.

It's worth mentioning that sound speed can be affected by temperature, humidity, and atmospheric pressure which can cause slight variations from the standard 340 m/s at STP.

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A long time after the circuit is completed (after many time constants), the voltage drop across the capacitor is 104.8V, the voltage drop across the resistor is 25.2V, the charge on the capacitor is -7.5μC, and the current through the resistor is 1.6mA.

A) Just after the circuit is completed, the voltage drop across the capacitor is 0V.

B) Just after the circuit is completed, the voltage drop across the resistor is 130V.

C) Just after the circuit is completed, the charge on the capacitor is 0C.

D) Just after the circuit is completed, the current through the resistor is 20.8mA.

E) A long time after the circuit is completed (after many time constants), the voltage drop across the capacitor is 104.8V.

F) A long time after the circuit is completed (after many time constants), the voltage drop across the resistor is 25.2V.

G) A long time after the circuit is completed (after many time constants), the charge on the capacitor is -7.5μC.

H) A long time after the circuit is completed (after many time constants), the current through the resistor is 1.6mA

Just after the circuit is completed, the voltage drop across the capacitor is 0V, the voltage drop across the resistor is 130V, the charge on the capacitor is 0C, and the current through the resistor is 20.8mA. A long time after the circuit is completed (after many time constants), the voltage drop across the capacitor is 104.8V, the voltage drop across the resistor is 25.2V, the charge on the capacitor is -7.5μC, and the current through the resistor is 1.6mA.

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Who u talm bout? I also agree I can name a few shiiii

The balloon's helium has a mass of 2.52 KG.

The quantity of things—which could include humans, animals, plants, or objects—in a given space is referred to as density. To determine density, divide the number of objects by the area's measurement. The number of people in a country divided by its area in square kilometers or miles is known as its population density.

The term "density" refers to the ratio between the volume (the amount of space taken up by an object or substance) and the amount of matter contained therein (its mass). The amount of mass per unit of volume is another method to define density.

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Answer:

The volume of a given gas sample is directly proportional to it's absolute temperature at constant pressure. The volume of a given amount of gas is inversely proportional to its pressure when the temperature is held constant.

Explanation:

Answer:

Motion is used to describe physical properties, while movement is used to describe the qualities of motion.

Atomic Mass = The sum of protons and neutrons in an atom. (Third option).

Atomic Number - The number of protons in an atom. (First option).

Mass Number - Exact amount of protons and neutrons (Last option).

Protons and Electrons - Charged particles of an atom (Fifth Option).

Protons and Neutrons - Particles in the Nucleus of an atom (Fourth option).

Valence Electons - Outermost particles of a shell. (Second Option).

Hope this helped!

Answer:

0.495m

Explanation:

The kinetic energy of the stone will be equal to the work done by the spring

Mathematically;

W = KE

1/2ke² = 1/2mv²

ke² = mv²

k is the spring constant = 150N/m

e is the extension

m is the mass = 0.015kg

v is the velocity = 70m/s

Substitute

150e² = 1/2 * 0.015 * 70²

150e² = 36.75

e² = 36.75/150

e² =  0.245

e = √0.245

e = 0.495m

Hence the extension of the catapult is 0.495m

Answer: Change

Explanation:

Answer:

B. they must be intrinsically far more luminous than the brightest galaxies.

Explanation:

Quasar is famous for being an intergalactic object which is billions of years away from the earth yet can still be seen, unlike the other star body, unlike giant galaxies.

Hence, the fact that quasars can be detected from distances where even the biggest and most luminous galaxies cannot be seen means that "they must be intrinsically far more luminous than the brightest galaxies."

This condition, including other related evidence gotten in recent years concerning our galaxy, has shown that quasars are probably the central nuclei of very distant, very active galaxies.

Because the charges at rest are unable to produce a magnetic field, neither of the two stationary charges will do so.

There is no magnetic field created when a charge is stationary since there is no motion inside the charge. Thus, nothing except an electric field is created.

Charges that are at rest can also feel the electric force. Charges in motion can experience magnetic force. Therefore, the electric field must not be zero and the magnetic field may or may not be zero if a charged particle at rest experiences an electromagnetic force.

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The possible potential difference between the truck's top and bottom side panels is 1.39 x 10^-4 V.

The potential difference between two points in an electric circuit is given by the product of the magnetic field, the cross-sectional area of the conductor, and the component of velocity perpendicular to the magnetic field.

The potential difference between the top and bottom of the truck's side panels can be calculated using the following formula:

V = Blv

Where:

V = potential difference (V)

B = magnetic field (T)

l = length of conductor (m)

v = velocity of conductor perpendicular to the magnetic field (m/s)

Given that the magnetic field is B = (5.0 x 10^-5 T, north) and the truck is moving west at 50 km/hr = 13.89 m/s, the potential difference between the top and bottom of the truck's side panels can be calculated as:

V = Blv = (5.0 x 10^-5 T) * (2.0 m) * (13.89 m/s) = 1.39 x 10^-4 V

It is important to note that the magnetic field is pointing north and the truck is moving west, so the velocity of the truck is perpendicular to the magnetic field, which means that the potential difference is not zero. Also, it is important to note that the velocity of the truck is given in km/hr and needs to be converted to m/s before using it in the equation.

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Deoxyribonucleic acid is a polymer composed of two polynucleotide chains that coil around each other to form a double helix.

A nonsense mutation occurs in the DNA when a sequence changes itself and gives rise to a stop codon rather than a codon specifying an amino acid. The presence of the new stop codon results in the production of a shortened protein that is non-functional.

A nonsense mutation is also known as base substitution which results in a stop codon in such a position from where there was not one before, which causes the premature termination of protein synthesis and, more than likely, a complete loss of function in the finished protein.

So we can conclude that a nonsense mutation always causes a loss of amino acids.

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The force between the charges are [tex]3844*10^{3} N[/tex]

                                              [tex]F = kQq/r^{2}[/tex]

Given, Q = q = 6.2 mC = [tex]6.2 * 10^{-3}[/tex]

           r = distance = 0.3m

           k = constant = [tex]9*10^{9}[/tex]

Putting these values in above equation we get F = [tex]3844*10^{3} N[/tex]

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Answer:

Roughly around 117.6 mph

Explanation

To find out something's speed (or velocity) after a certain amount of time, you just multiply the acceleration of gravity by the amount of time since it was let go of. So you get: velocity = -9.81 m/s^2 * time, or V = gt. The negative sign just means that the object is moving downwards.

90-degree angles are used as reference points for measuring other angles and for defining trigonometric functions and vector relationships.

In trigonometry, the sine, cosine, and tangent functions are defined in terms of the ratios of the sides of a right triangle, where one angle is 90 degrees. In addition, in vector calculus, the dot product and cross product of two vectors are often defined in terms of the angle between the vectors, and a 90-degree angle represents a perpendicular or orthogonal relationship between the vectors. The 90-degree angle is also important in mechanics and engineering as it is used to define the concept of torque, which is the rotational equivalent of linear force. Torque is defined as the product of a force and the perpendicular distance from the line of action of the force to the axis of rotation. Furthermore, it is also used to define the concepts of stress, strain and moment of inertia in strength of materials and mechanics.

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According to the given information the answer is Add masses to each car until they have the same mass, then test the carts again.

Features three low friction ball bearing wheels and matched axles to assure their rolling along a true line without deviation to produce accurate data, and a sturdy steel body to endure rigorous handling. Each cart is around 1.5 kg in weight. The ends of the cart lift above the bed to transport a brick or any other bulk, and the cart bed is covered with a rubber pad. At one end of the cart, there is a clip where a tape can be fastened. Each cart's pins fit into the holes in the others, allowing the mass to be doubled by stacking them.

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The complete question is-

Three different dynamic carts of different masses are rolled down a ramp. The heaviest one rolls down the ramp the fastest. Before concluding that a more massive cart will roll down a ramp faster, what experiment with these three carts might you want to do?

Answer:

5

Explanation:

1

The displacement in SHM is 2/3 of amplitude and the fraction of total kinetic energy is Ek = 5/9.

Let’s derive the equations needed from the first principle. The displacement for SHM with amplitude A and angular speed is:

s = A sin(ωt) ---- (1)

Differentiate the displacement to get the velocity:

v = s′ = A ωcos(ωt)

So for a mass m, the kinetic energy is:

Ek = 1/2 mv²

Ek =  1/2 m × (Aωcos(ωt) )² ---- (2)

At time t = 0 the displacement s = 0 and so all the energy is kinetic. Therefore the total energy is:

E (total) = 1/2m ×( Aωcos(0) )²

E (total) = 1/2m × (Aω)² ---- (3)

We can rephrase the kinetic energy in terms of the total energy by comparing (2) and (3):

Ek = E (total) cos²(ωt)

Using the identity  cos² (x) + sin² (x) = 1,  we can rewrite this equation as:

Ek = E total (1 − sin²) (ωt)) ---- (4)

Additionally, we are aware that potential energy U = E(total) Ek, so

U = E (total) − E (total) (1 − sin²(ωt) )

U = E (total) sin²(ωt)  ---- (5)

Now in this question, we’re given that  s = 2/3 A, so from our displacement formula  (1)  we have:

s = Asin (ωt) = 2/3 A

This is what we get for the kinetic energy when we insert it into equation (4):

Ek = E (total)(1 − (2/3)²)

Ek = 5/9 (E (total) )

Hence, the displacement in SHM is 2/3 of the amplitude, and the fraction of total kinetic energy is Ek = 5/9.

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Answer:

im confused what do you need us to answer

Explanation:

This minimum value is 223.9 m.

​

The attribute of motion of an item travelling a circular path is characterised as centripetal acceleration. Centripetal acceleration is defined as any item travelling in a circle with an acceleration vector pointing towards the centre of that circle.

The acceleration felt when moving in a uniform circular motion is known as centripetal acceleration. It always points toward the rotational centre. It is parallel to the linear velocity. The centripetal force is measured in an inertial frame of reference, whereas the centrifugal force is measured in a non-inertial frame of reference. Centripetal force is directed towards the axis of rotation or the centre of curvature, whereas centrifugal force is directed away from the circle's centre.

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