why can you hear a mans voice around the corner of a building even if you can't see him​

Answer:

4800

Explanation:

80*60=4800

Answer:

The melting and boiling point of water in Fahrenheit scale is divided into 180 equal intervals, that means each division denoting 1°F.

division means their melting and boiling point is divided into 180 equal intervals that means each division indicates 1 degree F.

Answer:

(a) The magnitude of the force electric force F = k ×(+Q) × (-2·Q)/r₀² = -2·Q²/(r₀²) which can be written as follows;

[tex]F = \dfrac{k \times (+ Q) \times (-2\cdot Q)}{r_0^2} = -\dfrac{k \times 2 \times Q^2}{r_0^2}[/tex]

Given that the charge of Y is twice the charge on X, we have the charge X will move towards the charge Y which is the +x direction

(b) The force, F, acting between the charges is given as follows;

[tex]F = \dfrac{k \times Q_1 \times Q_2}{r_0^2}[/tex]

When, Q₁ = X = -4Q, Q₂ = Y = -2Q, and r₀ = 2·r₀ we have;

[tex]F = \dfrac{k \times (-4\cdot Q) \times (-2\cdot Q)}{(2 \cdot r_0)^2} = \dfrac{k \times 8 \times Q^2}{4 \cdot r_0^2} = \dfrac{k \times 2 \times Q^2}{r_0^2}[/tex]

Therefore, the electric force exerted on object Y by the object X is the same and acts in an opposite direction to the force of X on Y in (a)

The net charge of the two objects in part (a) is Q - 2Q = -Q

The net charge of the two objects in part (b) is -4Q - 2Q = -6Q

Therefore, the net charge increases by a factor of 6 in part (b)

Explanation:

Answer:

Janice is roller skating at a constant speed away from her house. The first half of the street is flat, but the second half has a steep upward hill. Janice moves more slowly as she skates up the hill. Which graph shows Janice's position as she roller skates away from her house?

Explanation:

Answer:

3.766 kg or 3.7 kg

Explanation:

F= M*A equation

In terms of attitude change, the fundamental tenet of the cognitive theory would be that individuals are typically driven to lessen dissonance, which could be accomplished by altering their attitudes but also beliefs.

Cognitive theories concentrate on the premise that how exactly what people think causes the arousal of emotions, suggesting that some thoughts, as well as beliefs, as well as beliefs, contribute to healthy emotions as well as adaptive behavior while others lead to disturbing emotions and behaviors.

When people sense unease or guilt as a result of cognitive dissonance, they can actively lessen the dissonance by altering their attitude, beliefs, and even conduct in relation to it in order to attain consistency with both the contradictory cognitions.

In terms of attitude change, the fundamental tenet of the cognitive theory would be that individuals are typically driven to lessen dissonance, which could be accomplished by altering their attitudes but also beliefs.

To know more about attitude change

https://brainly.com/question/3721653

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Answer:

C. Delegated

Explanation:

Answer:

its letter C

Explanation:

just trust

Answer:

Explanation:

speed = distance / time

           = 15m / 3sec

           = 5 m/sec

Answer:

5 m/s

Explanation:

The equation for speed is distance/time. The distance, 15, will go over the time, 3. So, we have 15/3.

You can simplify this by dividing both sides by 3. 15/3 is 5. 3/3 is 1. Now we have 5/1, with 5 as meters, 1 and second.

Therefore, the correct answer is 5 m/s.

Hope I helped!!!!!!!

Answer:

i say A : )

Explanation:

Answer:

The magnitude of the impulse vector of the bat is 29.346 kg.m/s

The direction of the impulse vector of the bat is in the initial direction of the ball before impact

Explanation:

The given parameters are;

The mass of the ball, m₁ = 438 g

The speed of the ball = 39 m/s

The mass of the softball bat = 2.4 kg

The time of contact = 302 ms = 0.302 seconds

The speed of rebound = 28 m/s

The impulse = The change in momentum = Δp = F × Δt = m × Δv

The impulse on the ball = m₁ × Δv = 0.438 × (39 - (-28)) = 29.346 kg·m/s

Given that force of reaction of the bat is in opposite direction but equal to the force of the ball, and the time and the duration of contact with the ball is the same for both the ball and the bat, the impulse vector ore equal and opposite

Therefore, the magnitude of the impulse vector of the bat = 29.346 kg.m/s

The direction of the impulse vector of the bat = The initial direction of the ball before impact.

Answer:

B.) 2 m/s

Explanation:

I hope this helps!! ( Sorry if my handwriting is hard to read, I´m working on making it neater at the moment. )

Answer:

The earth

Explanation:

Answer:

D. the Earth

Explanation:

The Earth has a solid metal core at the center, which is similar to the pit of a peach. The Earth also has many thick layers of rock and liquid metal between the surface and the center of the Earth, similar to how a peach has a layer of skin and a thick section of fruit. The other answer choices don't have any similarities to a peach. The ocean is entirely liquid, the sun is a ball of gas, and the solar system contains lots of different planets and stars that all are made up of very different things.

Answer:

The pressure of liquid column is given by p=hpg, where h is depth, p is density and g is acceleration due to gravity.

Therefore, pressure of the liquid column increases with depth. The height of the blood column in a human body is more at feet than at the brain. Therefore, the blood pressure in humans is greater at the feet than the brain.

Answer:

the above answer is correct hope it's help you have a great day ☺☺keep smiling be happy stay safe

First of all, how long does it take it to fall 0.93m to the floor ?

Distance falling from rest = (1/2) · (g) · (T²)   <== memorize this formula

(0.93 m) = (1/2) (9.8m/s²) (T²)

Divide each side by (4.9 m/s²) :  T² = (0.93/4.9)  =  0.1898 s²

Square root each side:  T to hit the floor = 0.436 second

It got 0.56m away from the desk horizontally in 0.436 sec.

Speed = (distance) / (time)    <=== memorize this formula

Speed = (0.56 m) / (0.436 sec)

Speed = 1.28 m/s

Answer:

9.26m/s

Explanation:

Given parameters:

Height of the hill  = 4.37m

Mass of skate boarder = 70kg

Potential energy  = 3000J

Unknown:

Speed at the bottom of the hill  = ?

Solution:

At the bottom of the hill, the total potential energy is the same as the kinetic energy.

          Potential energy  = Kinetic energy

                  mgh  =  [tex]\frac{1}{2}[/tex]mv²  

                       2mgh  = mv²

                           v² = 2gh

                           v = √2gh

 g is the acceleration due to gravity

h is the height

                     v  = √2 x 9.8 x 4.37  = 9.26m/s

Answer:

F = 3.105 10⁻²⁰ N

Explanation:

For this exercise let's use Coulomb's law

          F = k q₁ q₂ / r²

in this case each of the grains has a charge

         q1 = 6.0 10⁻¹⁰ C

         q2 = 2.3 10⁻¹⁵ C

and they are separated by a distance r = 2 cm = 0.02 m

let's substitute

          F = 9 10⁹ 6.0 10⁻¹⁰ 2.3 10⁻¹⁵ / 0.02²

         F = 3.105 10⁻²⁰ N

Answer:

Total time taken t = 2.03 s (Approx)

Explanation:

Given:

Initial speed u = 20 m/s

Height h = 40 m

g = 9.81 m/s²

Find:

Total time taken t

Computation:

v = u + gt

0 = 20 + 9.81(t)

Total time taken t = 2.03 s (Approx)

Answer:

Is this even english?

Explanation:

Its unreadable.

Answer:

0.451

Explanation:

The main and basic action of any single muscle that would have on a body would be the fact that it would contain "contraction" to which your muscle would practically contract each other, which would then give to power to force, push, push, and to make work, and also, to move.

PLEASE MARK ME AS BRAINLIEST

Answer:

The person above is correct, The Answer is "CONTRATION" just verified it by ap.ex ;)

Explanation:

Answer:

The correct option is D

Explanation:

Generally, thermal and electrical conductivity is affected by valence electrons in an atom. These valence electrons carry electric charges (or conduct heat as the case may be) throughout the atom. The fewer the valence electrons, the higher its conductivity - this is as a result of free movement within the atom. The higher the valence electrons, the lesser its conductivity and when the outermost electrons have completely filled the outermost shell, the atom would be an insulator as there won't be carriers of electric charges.

Hence, from the above, sodium would be expected to have the highest electrical and  thermal conductivity because it has just one electron in it's outermost shell

Answer:D

Explanation: got it right

Answer:

i believe its true

Explanation:

i hope this helps

Answer:

maybe true

Explanation:

if we eat good then we will stay healthy

Answer:

it's true...........

Answer:

6.266829864 g

Explanation:

Answer:

the mathematical models, Newton's second law, improve the response of our designs and allow us to modify them to be more resistant.

Explanation:

When an object is designed it is done based on some models or guides, specifically Newton's second law is given in the form

            ∑ F = m a

We can make a design and test with forces applied in several different places and with different intensity, to find weak points in the design, this is done a lot today in the construction of tall buildings, in the design of airplanes; The great advantage of this is that it allows you to see problems without significant cost of money and human lives.

There are also designs that can be modified to improve the response of our system to different external stimuli, this is widely used in the design of bridges, to see the response of the structure before load changes and different climatic conditions.

In summary, the mathematical models, Newton's second law, improve the response of our designs and allow us to modify them to be more resistant.