A car accelerates from 25 km/hr in 30 seconds. what Is the acceleration?

Answers

Answer 1

Answer: 25 km/hr = 6,9 m/s
acceleration = 6,9 / 30 = 0,23

acceleration = 0,23 m / s²

Answer 2

Answer: acceleration is units of distance per time squared, take speed divided by time:

(25 km/hr)/(30 sec) = 0.833 km/hr/sec

these units aren't very helpful, so convert to units more likely to represent what your measuring. probably meters per seconds squared:

(0.833 km/hr/sec)*(1 hr/ 3600sec)*(1000m/km) = 0.23 m/s^2

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This problem will require you to make some assumptions, so be sure that your assumptions are clear. You have dinner reservations at Atrio in Brickell, but the elevator is broken. If you decide to take the stairs does that entitle you to eat the entire Chocolate Fondue for Two dessert by yourself? The Chocolate Fondue for Two is 1 lb. of dark chocolate, served with a variety of fruits for dipping.

As a longitudinal wave travels through a medium, it displaces the particles . parallel to the direction which the wave travels.b. along the opposite plane of travel.
c. vertically along the direction that the wave travels.
d. perpendicular to the path of travel.

Answers

As a longitudinal wave travels through a medium, it displaces the particles parallel to the direction which the wave travels.

What is longitudinal wave?

This type of waves are vibrations that takes place in the same direction i.e parallel to the wave motion. They are usually mechanical and examples include sound waves which requires a medium.

A longitudinal wave is a form of wave in which the displacement of the medium and the medium's vibration are both parallel to the direction of the wave.

A longitudinal wave moves the particles parallel to its direction of passage as it passes through a material.

To learn more about longitudinal wave refer to the link:

brainly.com/question/6663687

#SPJ5

Answer:

A- Parallel to tge direction which the wave travels

Explanation:

Car A has a mass of 1,200 kg and is traveling at a rate of 22 km/hr. It collides with car B. Car B has a mass of 1,900 kg and is traveling in the same direction at 25 km/hr. Which of the following statements is true?A) The momentum before the collision is equal to the momentum after the collision.

B) The momentum before the collision is greater than the momentum after the collision.

C) The momentum before the collision is less than the momentum after the collision.

Answers

The car A has a mass of 1200 kg.

The car B has the mass of 1900 kg.

It is given that velocity of car A is given as 22 Km/hr

The car B has the velocity of 25 Km/hr.

Let the mass of two bodies are denoted as $m_(1) \ and\ m_(2)$

Let the velocity of cars A and B are denoted as $v_(1) \ and\ v_(2)$

The momentum before collision is-

$p_(i) =m_(1) v_(1) +m_(2) v_(2)$

[Here p stand for momentum.]

We are asked to calculate the final momentum of the system after collision.

The answer of the question is based law of conservation of linear momentum.

As per law of conservation of linear momentum the sum total linear momentum for an isolated system is always constant.Hence irrespective of the type of collision[elastic and inelastic],the momentum of the system is always constant which is a universal truth.

Let after the collision the velocity of A and B are $v'_(1) \ and\ v'_(2)$

Hence the final momentum of the system is-

$p_(f) = m_(1) v'_(1) +m_(2) v'_(2)$

As per the law of conservation of linear momentum, the initial and final momentum must be equal i.e

$p_(i) =p_(f)$

$m_(1) v_(1) +m_(2)v_(2) =m_(1) v'_(1) +m_(2) v'_(2)$

Hence the option A is right.

A
This principle is known as the law of conservation of momentum.

You would convert from grams to moles by using the ___________ of the substance.a. Ionization energy
c. Atomic number
b. Molar mass
d. Avogadro’s number

Answers

You would convert from grams to moles by using the molar mass of the substance. The answer is letter B. for example, the molar mass Carbon dioxide is 44.01 g/mol. It means that for 1 mole of carbon dioxide, it contains 44.01 grams of Carbon dioxide.

At sea level, water ______________ at 100°C.

Answers

Answer:

boils

Explanation:

Vapour pressure of the liquid determines the temperature at which a liquid will boil. When water boils the pressure of the gas above it becomes equal to the vapour pressure of the liquid. This causes the inter-molecular bonds of water to break down and the water starts to evaporate. Water boils at 100°C at sea level however if you were to reach a higher altitude water would boil at a lower temperature as the air pressure will be lower.

At sea level water boils at 100 degrese celcius

The mass of a star can be determined by studyinga. the wavelength of light emitted by the star.
b. the color of the star.
c. Kepler's laws.
d. binary star systems.

Answers

The correct answer for the question that is being presented above is this one: "a. the wavelength of light emitted by the star." The mass of a star can be determined by studying the wavelength of light emitted by the star. It also has something to do with the gravitational force that it exerts.

Answer:

D. Binary Star Systems

Explanation:

A strand of 10 lights is plugged into an outlet. How can you determine if the lights are connected in series or parallel?A) Unscrew one light. If the other lights stay on, it's a series circuit.
B) Unplug the strand. If the first light stays on, it's a series circuit.
C) Unscrew one light. If the other lights turn off, it's a series circuit.
D) Cut the strand in half. If the plugged in half stays on, it's a series circuit.

Answers

series circuits, the current runs through all of them and they are conncted by the bulbs, so if you unscrew one, all light turn off

paralell, they are kinda independent, if you unscrew one, nothing happens to others

look at options
A. unscrew 1 light, if stay on, it's series, false, that's paralell

B. unplug, if stay on (then you have pozessed lights)

C. unsrew light, if stays on, it's parlell RIGHT ANSWER

D. cut strand in half (will cut power) if the plugged half stays on, then (pozessed circuit)

answer is C

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