Which is not an example of an external force acting on an object? (1 point)
• a meteor traveling unhindered through space
O a hockey puck striking the back of the net and coming to rest
O a billiard ball bouncing off the rail of a pool table
O a batter hitting a baseball

Answer:

2 m/s²

Explanation:

Given that

mass of the car, m = 1200 kg

Initial velocity of the car, u = 0 m/s

Distance covered, s = 450 m

Time taken, t = 15 s

Final velocity of the car, v = s/t = 30 m/s

there are four equations of motion. In this question, we will be attempting to solve it using the first equation of motion to solve this question

v = u + at, where

v = final velocity

u = initial velocity

a = acceleration

t = time taken

v = u + at

30 = 0 + 15a

30 = 15a

a = 30/15

a = 2 m/s

Answer:

1.5 Ampere

Explanation:

The formula is V=IR

so now we can derive out the formula which is

I =V

R

I = 6

4

I = 1.5 Ampere

In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. In water waves, energy is transferred through the vibration of the water particles.

tbh google

Your question has been heard loud and clear.

Energy propogates through different media in different ways.

Through a medium like water , energy is carried(propogated) from particle to particle in water waves.

Thank you.

Answer:

The tension is  [tex]T = 4326.7 \ N[/tex]

Explanation:

From the question we are told that

   The  total mass is  [tex]m = 200 \ kg[/tex]

    The  radius is [tex]r = 5 \ m[/tex]

     The  density of air is  [tex]\rho_a = 1.225 \ kg/m^3[/tex]

Generally the upward  force acting on the balloon is mathematically represented as

        [tex]F_N = T + mg[/tex]

=>     [tex](\rho_a * V * g ) = T + mg[/tex]

=>   [tex]T = (\rho_a * V * g ) - mg[/tex]

Here V is the volume  of the spherical helium filled balloon which is mathematically represented as

      [tex]V = \frac{4}{3} * \pi r^3[/tex]

=>   [tex]V = \frac{4}{3} * 3.142 *(5)^3[/tex]

=>   [tex]V = 523.67\ m^3[/tex]

So

    [tex]T = (1.225 * 523.67* 9.8 ) - 200 * 9.8[/tex]

   [tex]T = 4326.7 \ N[/tex]

Answer:

Weak attraction will be observed

Explanation:

This is because the charge induction is less than the insulating rod, and a postive charge is induced when a a negative sphere is placed closed to the end of the rod

Answer:

The current reduces to ¼ of the original current because a smaller voltage indicates that there is less energy to move the charge. As voltage decreases in a circuit, current also decreases.  

Explanation:

Answer:

Uninvolved (provide little guidance , nuturing and attention) that causes to grow up to be emotionally withdrawn, distant and lacking in curiosity.

Explanation:

Answer:

We are given that

The

Mass of person = 135lbm

Weight of person on earth will be

= mass x gravity constant

= 135lbm x 32.174 ft/s2

=4343.49 lbm-ft/s2 x 1 poundal-s2/lbm-ft

= 4343.49 poundal

Again we are given that

Mass of person = 135 lbm

But here remember Mass remains the same

So

Weight of person on moon will be

mass x gravity constant on moon

= 135 lbm x 32.174 ft/s2 x 1/6

= 723.9 lbm-ft/s2 x 1 poundal-s2/lbm-ft

= 723.9poundal

But we know that

1 ft slug / lbf-s2 = 32.174 ft lbm/ lbf-s2

So

1 slug = 32.174 lbm

So then the Mass of person

= 135lbm x 1slug/32.174 lbm

=4.2slugs

So finally

Weight = 405 poundals is same as

405 lbm-ft/s2

So

Mass = 35 slug x 32.174 lbm/slug = 1126.09 lbm

Acceleration rate = weight /mass

= (405 lbm-ft/s2) / (1126.09 lbm)

= 0.3597ft/s2 x 0.305m/ft

= 1.179 m/s²

This question is incomplete

Complete Question

Three equal point charges are held in place as shown in the figure below

If F1 is the force on q due to Q1 and F2 is the force on q due to Q2, how do F1 and F2 compare? Assume that n=2.

A) F1=2F2

B) F1=3F2

C) F1=4F2

D) F1=9F2

Answer:

D) F1=9F2

Explanation:

We are told in the question that there are three equal point charges.

q, Q1, Q2 ,

q = Q1 = Q2

From the diagram we see the distance between the points d

q to Q1 = d

Q1 to Q2 = nd

Assuming n = 2

= 2 × d = 2d

Sum of the two distances = d + 2d = 3d

F1 is the force on q due to Q1 and

F2 is the force on q due to Q2,

Since we have 3 equal point charges and a total sum of distance which is 3d

Hence,

F1 = 9F2

Answer:

The force is [tex]3.2\times10^{-20}\ N[/tex]

Explanation:

Given that,

A long, straight wire carries a current.

Suppose, a long, straight wire carries a current 0.86 A. An electron is traveling in the vicinity of the wire. At the instant when the electron is 4.50 cm from the wire and traveling at speed of [tex]6\times10^{4}\ m/s[/tex] directly toward the wire. What are the magnitude of the force that the magnetic field of the current exerts on the electron?

We need to calculate the magnetic field

Using formula of magnetic field

[tex]B=\dfrac{\mu_{0}I}{4\pi r}[/tex]

Where, I = current

r = distance

Put the value into the formula

[tex]B=\dfrac{4\pi\times10^{-7}\times0.86}{2\pi\times4.5\times10^{-2}}[/tex]

[tex]B=0.0000038\ T[/tex]

[tex]B=3.8\times10^{-6}\ T[/tex]

We need to calculate the force

Using formula of force

[tex]F=qvB\sin\theta[/tex]

Here, [tex]\theta=90^{\circ}[/tex]

Where, q = charge of electron

v = velocity of electron

B = magnetic field

Put the value into the formula

[tex]F=1.6\times10^{-19}\times6\times10^{4}\times3.8\times10^{-6}\sin90[/tex]

[tex]F= 3.2\times10^{-20}\ N[/tex]

Hence, The force is [tex]3.2\times10^{-20}\ N[/tex]

Answer:

An electron configuration is used to name the sublevels in which electrons are found within an atom

Explanation:

An electron configuration is used to name the sublevels in which electrons are found within an atom for example for the atom carbon has 6electrons so its configuration is 1s²2s²2p²

With the 1s 2s and 2p showing the various energy sublevels

Concerning the concepts and fundamentals of the atomic model, an electron configuration is used to name the sublevels in which electrons are found within an atom. Hence, option (C) is correct.

The arrangement of electrons in specific energy levels around the atomic nucleus of an atom is known as the electron configuration of an atom.

As per the atomic shell model, "The electrons occupy the various energy levels from the first shell nearest to the nucleus, upto the farthest shell from the nucleus.

Consequently, an electron configuration is used to name the sublevels in which electrons are found within an atom. For example for the atom carbon has 6 electrons so its configuration is 1s²2s²2p². With the 1s 2s and 2p showing the various energy sublevels.

Thus, we can conclude that an electron configuration is used to name the sublevels in which electrons are found within an atom.

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Wave speed = (wavelength) x (frequency)

Wave speed = (0.5 m) x (2 /sec)

Wave speed = 1 m/s

Answer:

The displacement of the driver is 194400m in the east direction

Explanation:

In physics, the displacement of a body is the distance the body travels in a specified direction.

We are told that the trucker is driving east on a perfectly straight highway. From this, we know that his direction is East. The thing left will be to find the distance travelled within 2 hours.

We can convert the time (2 hours) to seconds by multiplying it by 3600

2 hours = 7200 seconds

The distance travelled will be obtained by a product of truck's speed and the time travelled.

distance = 27m/s X 7200 s = 194400m

Therefore the displacement of the driver is 194400m in the east direction

Answer:

The path difference will be zero.

Explanation:

Given that,

In a young's double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in the distance.

Suppose, we find the multiple of wavelength

In young's double slit experiment,

We need to calculate the multiple of wavelength

Using formula of path difference

[tex]\Delta x=d\sin\theta[/tex]....(I)

[tex]d\sin\theta=m\lambda[/tex]

Where, m = fringe number

[tex]\lambda[/tex] = wavelength

For center of a bright fringe ,

m = 0

Put the value into the formula

[tex]d\sin\theta=0\times\lambda[/tex]

[tex]d\sin\theta=0[/tex]

Put the value in equation (I)

[tex]\Delta x=0[/tex]

Hence, The path difference will be zero.

Answer:

F=5.7×10⁻⁶

Explanation:

Not knowing a formula outright, I decided to follow the units of some relationships I did know. Radiation pressure is defined as force per area and also intensity divided by velocity (the speed of light here of course). Breaking intensity down into power per area and isolating force gave me the relationship F=(Power/Velocity),where power is given and the velocity is a constant.

My work is in the attachment, where I double checked the units too, comment with any questions.

The force exerted by the beam on a completely absorbing target is of 0.0120 N.

Given data:

The power of laser beam is, P = 1700 W.

The wavelength of light emitted from the laser is, [tex]\lambda = 700 \;\rm nm[/tex].

The diameter of the beam is, [tex]d =3.00 \;\rm mm =3.00 \times 10^{-3} \;\rm m[/tex].

When the laser beam strikes the target, then the force exerted by the laser beam on the target is equal to the product of the laser power and the area of projection of beam.

Then the expression is,

[tex]P = \dfrac{F}{A}\\\\F = P \times \dfrac{\pi}{4} d^{2}[/tex]

Solving as,

[tex]F = 1700 \times \dfrac{\pi}{4} \times (3.00 \times 10^{-3})^{2}[/tex]

F = 0.0120 N

Thus, we can conclude that the force exerted by the beam on a completely absorbing target is of 0.0120 N.

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Answer: heat loss by conduction

Explanation:

As the thermal energy from our body is flowing to the sponge, our body is losing heat.

Answer:

Z = 530.89 ohms

Explanation:

Given that,

Resistor, R = 40 ohms

Inductor, L = 3 mH

Capacitor, C = 5 μF

We need to find the impedance of the circuit at frequency of 60 Hz. For a series LCR circuit, its impedance is given by the formula as follows :

[tex]Z=\sqrt{R^2+(X_L-X_c)^2} \\\\Z=\sqrt{R^2+(2\pi fL-\dfrac{1}{2\pi fC})^2} \\\\Z=\sqrt{(40)^2+(2\pi \times 60\times 3\times 10^{-3}-\dfrac{1}{2\pi \times 60\times 5\times 10^{-6}})^2} \\Z=530.89\ \Omega[/tex]

So, the impedance of the circuit is 530.89 ohms.

Answer:

E=3V/m

Explanation:

The electric field here is simply the voltage running through the wire divided by its length. (Meaning E is independent of the diameter of the wire.)

Short work is in the attachment.

Answer:

0.995*c= 2.98*10^8m/s

Explanation:

Using

E= mc²

10.5 mc² = mc²/√1-v²/c²

So

1-v²/c²=( 1/10.5)²

V= √1-0.009c

V= 0.995 x 3E8m/s

= 2.98*10^8m/s

Answer:

B

Explanation:

The enzime's active site bindes to the substrate.... when an enzime binds to a substrate it forms a enzime-substrate complex

When an enzyme and a substrate interact at an active site, the products are bound irreversibly. Therefore, option B is correct.

Enzymes can be described as proteins that act as biological catalysts by accelerating reactions. The enzymes may act on the molecules called substrates, and the enzyme changes the substrates into different molecules known as products.

All metabolic processes require enzyme catalysis to occur at rates fast enough to sustain life. Metabolic pathways will depend upon enzymes to catalyze each step.

Enzymes catalyze more than 5,000 biochemical reaction types. Enzymes enhance reaction rates by lowering their activation energy. Some enzymes make their conversion of substrate to product occurs.

Enzymes are much larger than substrates, they can have 62 amino acid residues to over 2,500 residues in the animal fatty acid synthase. The catalytic site is located next to binding sites where residues are oriented to the substrates. The catalytic site and binding site compose the active site.

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Answer:

high density can withstand high acceleration and applied forces

Heavy metals are toxic to humans,

the clay is quite abundant and in general it is not toxic

Explanation:

The selection of materials for the construction of rockets takes into account many aspects, the technical resistance to the demands of space travel, but also the abundance of the material. Heavy metals have two very serious problems. The first one, some of them are a little scarce in nature, but the most serious problem is that almost all of them are toxic to humans, for example: lead and mercury.

On the other hand, the clay is quite abundant and in general it is not toxic to living beings.

If we use Newton's second law

          F = m a

let's use the concept of density

         rho = m / V

        m = rho V

let's substitute

         F = rho V a

From this expression we see that a material with high density can withstand high acceleration and applied forces, such as those existing in spacecraft clearance and re-entry to Earth.

Unfortunately with this law there is no criterion to select a material unless its density is high, in addition to this criterion low toxicity criteria for human beings are used,

Answer:

a. 3 s.

Explanation:

Given;

angular acceleration of the wheel, α = 4 rad/s²

time of wheel rotation, t = 4 s

angle of rotation, θ = 80 radians

Apply the kinematic equation below,

[tex]\theta = \omega_1 t \ + \ \frac{1}{2} \alpha t^2\\\\80 = 4\omega_1 + \frac{1}{2}*4*4^2\\\\80 = 4\omega_1 + 32\\\\ 4\omega_1 = 48\\\\ \omega_1 = \frac{48}{4}\\\\ \omega_1 = 12 \ rad/s[/tex]

Given initial angular velocity, ω₀ = 0

Apply the kinematic equation below;

[tex]\omega_1 = \omega_o + \alpha t_1\\\\12 = 0 + 4t\\\\4t = 12\\\\t = \frac{12}{4}\\\\t = 3 \ s[/tex]

Therefore, the wheel had been in motion for 3 seconds.

a. 3 s.

Answer:

The dimensionality of B is length per cubic time.

Explanation:

Units for displacement and time are length [tex][L][/tex] and time [tex][T][/tex], respectively. Then, formula can be tested for dimensional analysis as follows:

[tex][L] = B\cdot [T]^{3}[/tex]

Now, let is clear [tex]B[/tex] to determine its units:

[tex]B = \frac{[L]}{[T]^{3}}[/tex]

The dimensionality of B is length per cubic time.

Answer:

stream B.

Explanation:

Stream B has higher mass flow rate of water due to higher temperature i.e. 25◦C as compared to stream A which has a lower temperature i. e. 15◦C because temperature affect the viscosity of liquid. Higher temperature make liquid or water thinner which means lower viscosity. This thinning of liquid make easier the flow of water in the pipes or other medium with the increase in temperature.

Answer:

George Washington

Explanation:

The image of the famous first President of the United States-George Washington (from  1789 to 1797) is found on every $1 bill. George Washington's image began to be found on the $1 bill in 1869.

Answer:

blindness

Explanation:

got it right

Blindness is not a symptom of strong emotions in this scenario and is denoted as option C.

These are mental states brought on by neurophysiological changes and examples include sad, happy etc.

Blindness is a physical condition which involves impairment of the eyes which is why it was chosen.

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Complete Question

Given that average speed is distance traveled divided by time, determine the values of m and n when the time it takes a beam of light to get from the Sun to the Earth (in s) is written in scientific notation. Note: the speed of light is approximately 3.0×108 m/s.

Answer:

The  values of  m and  n is    5 and  2  

Explanation:

From the question we are told that

   The  speed of light is [tex]v  =  3.0 *10^{8} \  m/s[/tex]

Generally the distance between the sun and the earth has a constant value

      [tex]d =  1.5*10^{11} \  m[/tex]

So the time  taken is mathematically evaluated as

        [tex]t =  \frac{1.5*10^{11}}{3.0*10^{8}}[/tex]

         [tex]t =  5.0 *10^{2}[/tex]

Generally scientific notation is represented as

        [tex]m* 10^n[/tex]

So comparing the standard representation of scientific notation and the value obtained we see that

     m =  5  and  n=  2  

Answer:

1.45

Explanation:

Answer:

[tex]\mathbf{U = \dfrac{3 k_c Q^2_{total}}{5R}}[/tex]

Explanation:

From the information given;

The surface area of a sphere = [tex]4 \pi r ^2[/tex]

If the sphere is from the collection of spherical shells of infinitesimal thickness = dr

Then,

the volume of the  thickness and the sphere is;

V = [tex]4 \pi r ^2 \ dr[/tex]

Using Gauss Law

[tex]V(r) = \dfrac{k_cq(r)}{r}[/tex]

here,

q(r) =charge built up contained in radius r

since we are talking about collections of spherical shells, to work required for the next spherical shell r +dr is

[tex]-dW= dU = V(r) dq = \dfrac{k_c \ q(r)}{r} \ dq[/tex]

where;

[tex]q (r) = \dfrac{4}{3} \pi r^3 \rho[/tex]

dq which is the charge contained in the  next shell of charge

here dq = volume of the shell multiply by the density

[tex]dq = 4 \pi r^2 \ dr \ \rho[/tex]

equating it all together

[tex]dU = \dfrac{k_c \frac{4}{3} \pi r^3 \rho}{r} 4 \pi r^2 \ dr \ \rho = \dfrac{16 \pi^2 \ k_c \ \rho^2}{3} \ r^4 \ dr[/tex]

Integration the work required from the initial radius r to the final radius R, we get;

[tex]U = \int^R_0 \ dU[/tex]

[tex]U = \int^R_0 \dfrac{16 \pi^2 \ k_c \rho^2}{3} r^4 \ dr[/tex]

[tex]U = \int^R_0 \dfrac{16 \pi^2 \ k_c \rho^2}{3} [\dfrac{r^5}{5}]^R_0[/tex]

[tex]U = \dfrac{16 \pi^2 k_c \rho^2}{15} \ R^5[/tex]

Recall that:

the total charge on a sphere, i.e [tex]Q_{total} = \dfrac{4}{3} \pi R^3 \rho[/tex]

Then :

[tex]\mathbf{U = \dfrac{3 k_c Q^2_{total}}{5R}}[/tex]

Answer:

Explanation:

This is due to an increase in hydrostatic pressure, the force per unit area exerted by a liquid on an object. The deeper you go under the sea, the greater the pressure of the water pushing down on you. For every 33 feet (10.06 meters) you go down, the pressure increases by one atmosphere .