the bouncing back of sound when it hits ahard surface is called
​

Answer:

know on car wright now

Explanation:

Answer:

b

Explanation:

i just did that question

Answer:

friction

Explanation:

the road is the pathway for the vehicle so the tures create friction to stay sturdie

Answer:

the moment of inertia of the wheel is is 6.245 kg.m²

Explanation:

Given;

applied force, f = 22.04 N

radius of the wheel, r = 0.34 m

angular acceleration, a = 1.2 rad/s²

The moment of inertia of the wheel is calculated as;

[tex]I = \frac{\tau}{\alpha } \\\\I = \frac{Fr}{\alpha } \\\\I = \frac{22.04 \ \times \ 0.34 }{1.2} \\\\I = 6.245 \ kg.m^2[/tex]

Therefore, the moment of inertia of the wheel is is 6.245 kg.m²

Answer:

the power used by the person is 17 W.

Explanation:

Given;

applied force, F = 51 N

distance through which the chair is used, d = 5 m

time of motion, t = 15 s

The power used by the person is calculated as;

[tex]P = FV\\\\P = F \ \times \ \frac{d}{t} \\\\P = 51 \ \times \ \frac{5}{15} \\\\P = 17 \ W[/tex]

Therefore, the power used by the person is 17 W.

Answer:

σ = ±708 nC/m²

Q = ±177 nC

Explanation:

given data

Side of copper plate L = 50 cm

Electric field, E = 80 kN/C

solution

we get here Charge density,σ that is express as

σ = E x ε₀         ....................1

here ε₀ is Permittivity of free space that is 8.85 x 10⁻¹² C²/Nm²

so put value in eq1we get

σ = 80 x 10³ x 8.85 x 10⁻¹²

σ = 708 x 10⁻⁹ C/m²

σ = 708 nC/m²

and

now we get here total change on each faces

Q = σ  A    ...............2

Q = 708 x 10⁻⁹ x (0.50)²

Q = 177 nC

professional is the answer

3rd

Answer:

the magnitude of the constant acceleration is 6.98 m/s²

Explanation:

Given;

distance traveled at a constant velocity, d = 130 m

time of motion, t = 4.9 s

The constant velocity is calculated as;

[tex]v = \frac{d}{t} \\\\v = \frac{130}{4.9} \\\\v = 26.53 \ m/s[/tex]

The car comes to a stop in 3.8 s.

When the car comes to a complete stop, the final velocity of the car will be zero.

the constant acceleration is calculated as;

v = u + at

0 = u + at

at = -u

a = -u/t

a = (-26.53) / (3.8)

a = -6.98 m/s²

Therefore, the magnitude of the constant acceleration is 6.98 m/s²

Answer:

Option B. 28 N

Explanation:

From the question given above, the following data were obtained:

Coefficient of static friction (μ) = 0.35

Normal force (N) = 80 N

Frictional force (F) =?

The coefficient of static friction, frictional force and the normal force are related according to the following equation:

Coefficient of friction = frictional force / normal force

μ = F/N

With the above formula, we can obtain the frictional force as follow:

Coefficient of static friction (μ) = 0.35

Normal force (N) = 80 N

Frictional force (F) =?

μ = F/N

0.35 = F / 80

Cross multiply

F = 0.35 × 80

F = 28 N

Thus the frictional force is 28 N

Answer:

Option B. 28 N

Explanation:

Answer:

We need to add 9 N in the direction of F(1)

Explanation:

We know that in equilibrium the total force is equal to zero, so we have:

[tex]F_{total}=F_{1}+F_{2}+F_{3}=0[/tex]

F(1) is 12 N

F(2) is 21 N in the opposite direction

F(3) is the additional force.

Then, using these values into the total force equation we have:

[tex]12-21+F_{3}=0[/tex]

[tex]-9+F_{3}=0[/tex]

[tex]F_{3}=9\: N[/tex]

Therefore, we need to add 9 N in the direction of F(1)

I hope it helps you!

Answer:

4.61 * 10^-14 m/s ; 9.20 * 10^-10 m/s

Explanation:

To acceleration due to gravity, a

a = GM / r²

Mass of pluto = 1.4x10^22 kg

Distance apart, r = 4.50x10^12 m

G = Gravitational constant = 6.67 * 10^- 11

a = (6.67*10^-11 * 1.4x10^22) / (4.50x10^12)²

a = 9.338 * 10^(-11 + 22) / 20.25x10^24

a = 0.461 * 10^(11 - 24)

a = 0.461 * 10^-13

a = 4.61 * 10^-14 m/s

B.)

Mass of Uranus = 8.62x10^25 kg

Distance apart, r = 2.50x10^12 m

a = (6.67*10^-11 * 8.62x10^25 ) / (2.50x10^12 )²

a = 57.4954 * 10^(-11 + 25) / 6.25x10^24

a = 9.199264 * 10^(14 - 24)

a = 9.199264 * 10^-10

a = 9.20 * 10^-10 m/s

Answer:

Time, t = 0.439 seconds

Explanation:

Given the following data;

Angle, x = 21°

Initial velocity, u = usinx = 12Sin21° = 4.3004m/s

We know that acceleration due to gravity is equal to 9.8m/s

Final velocity = 0m/s since it reached its highest trajectory.

To find the time, we would use the first equation of motion;

V = U + gt

0 = 4.3004 + (-9.8)t

0 = 4.3004 - 9.8t

9.8t = 4.3004

t = 4.3004/9.8

t = 0.439 seconds

Therefore, it will take the ball 0.439 seconds to reach the top of its trajectory.

Answer: 0.44 s

Explanation:

that’s what I got correct on my test in physics ;)

The question is incomplete. Here is the complete question.

An inductor, battery, resistance and ammeter and switch are connected in series. If the switch, initially open, is now closed, what is the current's final value?

a. zero

b. Battery voltage divided by inductance

c. battery voltage times inductance

d. battery voltage divided by resistance

Answer: d. battery voltage divided by resistance

Explanation: Resistance, voltage and current are related by Ohm's Law, which is explained as the current that passes through a conductor is directly proportional to the applied voltage. The constant of proportionality between them is Resistance.

Ohm's Law is represented by [tex]V=R.I[/tex]

Inductor is a component that stores magnetic energy when electricity is applied to it.

Ammeter is an object constructed to measure electric current of a circuit and it is always connected in serie.

So, in the circuit, when the switch is closed, the "only way" for current to pass through is because of Ohm's Law, which means its magnitude will be:

[tex]I=\frac{V}{R}[/tex]

Then, the correct alternative is d. voltage divided by resistance.

Answer:

The acceleration of the ball as it rises to the top of its arc equals 9.807 meters per square second.

Explanation:

Let suppose that maximum height of the arc is so small in comparison with the radius of the Earth.

Since the ball is launched upwards, then the ball experiments a free-fall motion, that is, an uniform accelerated motion in which the element is accelerated by gravity. Then, the acceleration experimented by the motion remains constant at every instant and position.

Besides, the gravitational acceleration in the Earth and, in consequence, the acceleration of the ball as it rises to the top of its arc equals 9.807 meters per square second.

Answer:

I. 6 cells .

II. Series connection.

Explanation:

I. Determination of the number of cells needed.

From the question given above,

Total voltage (V) = 9 V

1.5 V = 1 cell

Number of cells needed =?

The number of cells needed to make the 9V battery can be obtained as follow:

1.5 V = 1 cell

Therefore,

9 V = 9 V × 1 cell / 1.5 V

9 V = 6 cells

Thus, 6 cells of 1.5 V each is needed

II. Determination of the connection line

Total voltage (Vₜ) = 9 V

Cell 1 (V₁) = 1.5 V

Cell 2 (V₂) = 1.5 V

Cell 3 (V₃) = 1.5 V

Cell 4 (V₄) = 1.5 V

Cell 5 (V₅) = 1.5 V

Cell 6(V₆ ) = 1.5 V

For parrall connection:

Vₜ = V₁ = V₂ = V₃ = V₄ = V₅ = V₆

9 V = 1.5 V =... = 1.5 V

For series connection:

Vₜ = V₁ + V₂ + V₃ + V₄ + V₅ + V₆

9 = 1.5 + 1.5 + 1.5 + 1.5 + 1.5 + 1.5

9 V = 9 V

From the illustration above, we can see that series connection of each cells will give a total volt of 9 V unlike the parallel connection which resulted to 1.5 V.

Therfore, the cells should be arranged in series connection

Answer:

false

Explanation:

Answer:

Explanation:

From the given information:

The gravitational potential energy at A is:

[tex]PE_A = mgh[/tex]

GIven that:

mass(m) = 3

height (h) = 3

[tex]PE_A =3\times 9.81 \times 3[/tex]

[tex]\mathbf {PE_A =88.29 \ J }[/tex]

b)

Using the conservation of mechanical  energy:

[tex]PE_A+KE_A = PE_B + KE_B[/tex]

[tex]88.29 +0 = 3(9.8)(1) + KE_B[/tex]

[tex]88.29 = 29.4 + KE_B[/tex]

[tex]KE_B = 88.29 -29.4[/tex]

[tex]\mathbf{ KE_B= 58.89 \ J}[/tex]

From the data provided and the calculations done, the potential energy at A is 88.3 J while the kinetic energy at B is 58.9 J.

The potential energy of a body is given as:

where:

m = mass of the object

g = acceleration due to gravity

h = h

At A:

m= 3.0 kg

g = 9.8 m/s^2

h = 3.0 m

PE = 3 × 9.8 × 3

PE = 88.3 J

Kinetic energy, KE of a body is given as:

where:

From the law of conservation of energy, the sum of potential energy and Kinetic energy at every point is equal.

PE + KE at A = PE + KE at B

KE at B = PE + KE at A - PE at B

At A, PE = 88.3 J and KE = 0

At B; h = 1.0 m

PE = 3 × 9.8 × 1

PE = 29.4 J

Therefore, KE at B = 88.3 + 0 - 29.4

KE at B = 58.9 J

Therefore, the potential energy at A is 88.3 J while the kinetic energy at B is 58.9 J.

Learn more about potential energy and Kinetic energy at: https://brainly.com/question/14427111

Answer:

Answer is explained in the explanation section below.

Explanation:

Note: This question is incomplete and lacks the necessary diagram of the circuits to solve for this question. However, I have found similar question on the internet and dragged the diagrams out of it. I have attached the diagrams of the circuits for your ease. It has two circuits to be solved. Attachment 1 refers to first circuit and Attachment 2 refers to second circuit.

Solution:

We are asked to find the potential difference and current through each resistor.

So,

Calculations for Circuit 1: Please refer to Attachment 1

First we need to find the Resistance:

Req = [tex]\frac{9 . 6}{9+6} +3[/tex]

R = 6.6 Ohm

Now, we know that:

V = IR

So,

I = V/R

V = 12 V

I = 12 V/ 6.6 ohm

I = 1.82 Amperes.

Now,

The Potential Difference through 3 ohm resistor:

P.D = [tex]V_{3}[/tex] = 1.82 x 3

[tex]V_{3}[/tex] = 5.45 V

Now,

The Potential Difference through 6 ohm and 9 ohm resistor:

[tex]V_{6/9}[/tex] =  12V - 5.45V

[tex]V_{6/9}[/tex] =  6.545V

Now,

The current through 6 ohm is:

[tex]I_{6}[/tex] = [tex]\frac{6.545}{6}[/tex]

[tex]I_{6}[/tex] = 1.09 A

Now,

The Current through 9 ohm is:

[tex]I_{9}[/tex]  = [tex]\frac{6.545}{9}[/tex]

[tex]I_{9}[/tex]  = 0.72 A

Similarly,

Calculations for Circuit 2: Please refer to attachment 2:

Req = [tex]\frac{(30+50).90}{90+(30+50)} +20[/tex]

Req = 62.35 ohm

I = V/R

I = 12 V/ 62.35ohm

I = 0.192 Amperes.

Now,

The The Potential Difference through 20 ohm resistor:

[tex]V_{20}[/tex] = 20 x 0.192

[tex]V_{20}[/tex] = 3.849 V

Now,

The The Potential Difference through 90 ohm resistor:

[tex]V_{90/(30+50)}[/tex] = 12 - 3.849

[tex]V_{90/(30+50)}[/tex] = 8.150

Now,

The Current through 90 ohm is:

[tex]I_{90}[/tex]  = 8.1509/90

[tex]I_{90}[/tex] = 0.0905 Amperes

Now,

The Current through 30 and 50 ohm is:

[tex]I_{30/50}[/tex] = 0.192 - 0.0905

[tex]I_{30/50}[/tex]  = 0.101 A

Now,

The Potential Difference through 50 ohm resistor:

[tex]V_{50}[/tex] = 50 x 0.101

[tex]V_{50}[/tex]  = 5.094 V

The Potential Difference through 30 ohm resistor:    

[tex]V_{30}[/tex] = 30 x  0.101

[tex]V_{30}[/tex] = 3.0566 V

Answer:

Answer is explained in the explanation section below.

Explanation:

Solution:

We know from the Coulomb's Law that, Coulomb's force is directly proportional to the product of two charges q1 and q2 and inversely proportional to the square of the radius between them.

So,

F = [tex]\frac{Kq1q2}{r^{2} }[/tex]

Now, we are asked to get the greatest force. So, in order to do that, product of the charges must be greatest because the force and product of charges are directly proportional.

Let's suppose, q1 = q

So,

if q1 = q

then

q2 = Q-q

Product of Charges = q1 x q2

Now, it is:

Product of Charges = q x (Q-q)

So,

Product of Charges = qQ - [tex]q^{2}[/tex]

And the expression qQ - [tex]q^{2}[/tex] is clearly a quadratic expression. And clearly its roots are 0 and Q.

So, the highest value of the quadratic equation will be surely at mid-point between the two roots 0 and Q.

So, the midpoint is:

q = [tex]\frac{Q + 0}{2}[/tex]

q = Q/2 and it is the highest value of each charge in order to get the greatest force.

Answer:

the apparent power of the circuit is 969.5 VA.

Explanation:

Given;

Applied voltage, E = 277 V

current flowing in the circuit, I = 3.5 A

Apparent occurs when the applied voltage and current are out of phase because of reactance. This apparent power of the circuit is calculated as;

[tex]P = EI\\\\P= 277 \ \times \ 3.5 \\\\P = 969.5 \ VA[/tex]

Therefore, the apparent power of the circuit is 969.5 VA.

Answer:

Distance s  = 90 meter

Explanation:

Given:

Initial velocity u = 0 m/s

Final velocity v = 30 m/s

Acceleration a = 5 m/s²

Find:

Distance s

Computation:

v² = u² + 2as

30² = 0² + 2(5)(s)

Distance s  = 90 meter

Answer:

the heat emitted by potatoes is much less than the heat emitted by turkey

Explanation:

The heat transfer is given by

        Q = m [tex]c_{e}[/tex] ΔT

where m is the mass of the body, c_e is the specific heat and ΔT is the change in temperature of the body

in this case they ask us to appear the heat emitted by the potatoes and the turkey.

From the tables found the specious colors of both

potato     c_e = 0.82 Kcal / kg ºC

turkey      c_e = 0.72 Kcal / kg ºC

Since the two bodies have the same initial temperature and we assume that they reach the same final (ambient) temperature, the ratio of the heat emitted is

          Q₁ / Q₂ =  [tex]\frac{ m_1 \ c_{e1} }{m_2 \ c_{e2} }[/tex]

where we use the rise 1 for the potatoes and the su index 2 for the turkey

the mass of the potatoes can be estimated at approximately m = 1 ka

we substitute

          Q₁ / Q₂ =  [tex]\frac{1 \ 0.82}{ 20 0.72}[/tex]

           Q₁ /Q₂ = 0.0569

           Q₁ = 0.0569 Q₂

therefore the heat emitted by potatoes is much less than the heat emitted by turkey

Answer:

67.17 m

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 32 m/s

Angle of projection (θ) = 20°

Acceleration due to gravity (g) = 9.8 m/s²

Range (R) =?

The range can be obtained as follow:

R = u²Sine 2θ / g

R = 32² × Sine (2×20) / 9.8

R = 1024 × Sine 40 / 9.8

R = (1024 × 0.6428) / 9.8

R = 67.17 m

Thus, the range of the ball is 67.17 m

Answer:

For the detection of beta particles, organic scintillators can be used. Pure organic crystals include crystals of anthracene, stilbene, and naphthalene. The decay time of this type of phosphor is approximately 10 nanoseconds. This type of crystal is frequently used in the detection of beta particles.

- Hope this helps!

Answer:

The man is on the verge of having a heart attack or a stroke.

Explanation:

If he has a family history of coronary (heart) disease, it means it could normally affect. Normally here means without anything aggravating it. It's already in his lineage so he could have it.

Now, he's past middle age - he's 45. He's past the growing stages of life. His organs are fully developed herefore.

Now also, he suffers from Type 2 diabetes. Although this is sometimes milder than Type 1 diabetes, it increases the risk of having a heart disease or a stroke!

Soda, especially sweetened one, is not to be taken too often because it can cause Diabetes Mellitus. For a diabetes patient, this should be a "no-go-area". Taking this constantly (everyday at work) will now put this 45-year-old man in harm's way.

He is no more at risk of having complications but already on the path to a heart disease or a stroke.

a. All go out

b. All get dimmer

c. All get brighter

d. All stay on

Answer:

C. Methane

Explanation:

A chemical equation can be defined as a reaction between two chemical elements.

For a chemical reaction (equation) to be balanced, the condition which must be met is that the number of atoms contained in the reactants must be equal to the number of atoms in the products.

This ultimately implies that, the mass and charge of the chemical equation are both balanced properly.

Methane is a hydrocarbon compound formed by the reaction between four (4) hydrogen atoms with a carbon atom. It belongs to the alkane group of hydrocarbons and has the following physical and chemical properties; colorless, highly flammable, non-toxic and odorless gas. The empirical formula for Methane is CH4.

Methane is a gas at 45 degrees celsius. This ultimately implies that, at 45°C methane is a gas because it is still within the range of standard temperature and pressure.