I need help by today

A driver brings a car to a full stop in 2.0 s. If the car was initially

vagabundo [1.1K]

Answer:

$\boxed {\boxed {\sf D. \ -11 \ m/s^2}}$

Explanation:

Acceleration can be found by dividing the change in velocity by the time.

$a=\frac{v_f-v_i}{t}$

where Vf is the final velocity, Vi is the initial velocity, and t is the time.

Since the car came to a complete stop, it's final velocity was 0 meters per second.

The initial velocity was 22 meters per second.

The time was 2.0 seconds.

$v_f=0 \ m/s\\v_i=22 \ m/s\\t= 2.0 \ s$

Substitute the values into the formula.

$a=\frac{0 \ m/s-22 \ m/s}{ 2.0 \s }$

Subtract in the numerator first.

0 m/s- 22 m/s = -22 m/s

$a=\frac{-22 \ m/s}{2.0 \ s}$

Divide.

$a= -11 \ m/s^2$

The acceleration of the car was -11 meters per square second. The negative acceleration indicates slowing down/stopping.

8 0

3 years ago

Enter a curve slower than the posted speed if your vehicle has a high center of gravity or if surface _____________ is less than

alisha [4.7K]

Answer:

Traction

Explanation:

Enter a curve slower than the posted speed if your vehicle has a high center of gravity or if surface Traction is less than ideal.

Traction is an act of drawing or pulling something over a surface specially a road or a track or it also defined as the grip of a tire on road or a wheel on rail. So speed when entering a curve should be slower when the tire has low traction to avoid accident.

5 0

4 years ago

The model below shows a carbide ion. 8 light grey and 6 dark grey balls sit at the center with 2 concentric black rings around t

azamat

Answer:

This carbide ion change into a neutral carbon atom.

Explanation:

Given that,

Light grey balls = 8

dark grey balls = 6

medium grey balls = 2

Charge on dark grey ball = +1

Charge on light grey ball = 0

Charge on medium grey ball = -1

We need to change this carbide ion to a neutral carbon atom

Using given data

A dark grey ball has one positive charge. It means, it is a proton.

A light grey ball has has zero charge. It means, it is a neutron.

A medium grey ball has one negative charge.It means, it is a electron.

We know that,

The number of proton and number of electron is equal in a neutral atom.

So, No charge is present on the given model of atom.

Therefore, we can say that the atom is neutral.

We know that,

The sum of total number of protons presents in an atom it is called atomic number.

So, The total number of protons is 8, the total number of electrons is 8 and the total number of neutrons is 9 in given atom.

Hence, This carbide ion change into a neutral carbon atom.

6 0

4 years ago

The pictures represent three different states of matter.

Veronika [31]

ONLY if ur asking for the 3 states of matter it is solid liquid and gas

4 0

4 years ago

Approximately how much heat energy does it take to raise 1 kg of water by 1 k?

Sidana [21]

Answer:

4186 Joules

Explanation:

The specific heat capacity of a substance is defined as the amount of heat needed to raise the temperature of 1 kg of the substance by 1 Kelvin. In formula,

$C_s = \frac{Q}{m \Delta T}$

where

Q is the amiunt of heat needed

m = 1 kg is the mass

$\Delta T = 1 K$

is the variation of temperature of the substance

For water, the specific heat capacity is $4186 J/(kg K)$ . This means that the heat energy required to raise 1 kg of water by 1 K is exactly 4186 J.

4 0

3 years ago