All categories

3 years ago

In which situation is the acceleration of the car negative?

Chemistry

2 answers:

Llana [10]3 years ago

4 0

Answer is: B.)The velocity of a car reduced from 50 km/h over one minute.

Ending velocity is defined as the velocity attained by a body after completing distance at certain time interval:

v(ending velocity) = v(initial velocity) + a·t.

a is acceleration attained by the body (in this examle car).

t is time (in this example one minute).

Because velocity is reduced, acceleration has negative sign.

An car average acceleration over a period of time is its change in velocity.

Charra [1.4K]3 years ago

3 0

B) The velocity of the car reduced from 50k/m over one min.

You might be interested in

What would happen to Earth’s tides if the distance between Earth and the Moon increased?

Alex Ar [27]

Tides would be much weaker. Tidal forces from the moon would be eight times weaker.

6 0

3 years ago

Read 2 more answers

Reactioneaza total 22 kg calcar de puritate 80 % cu o solutie de acid clorhidric de concentratie 30 %. Stiind ca rezulta clorura

WINSTONCH [101]

Answer:

De la Alex;)(da alex ăla de e din cls cu tn:)

7 0

3 years ago

One crystalline form of silica (SiO2) has a cubic unit cell, and from X-ray diffraction data it is known that the cell edge leng

tigry1 [53]

Answer:

There are 8Si atoms and 16 O atoms per unit cell

Explanation:

From the question we are told that:

Edge length $l=0.700nm=>0.7*10^9nm$

Density $\rho=2.32g/cm^3$

Generally the equation for Volume is mathematically given by

$V=l^3$

$V=(0.7*10^9)m^3$

$V=3,43*10^-{22}cm$

Where

Molar mass of (SiO2) for one formula unit

$M=28+32$

$M=60g/mol$

Therefore

Density of Si per unit length is

$\rho_{si}=\frac{9.96*10^{23}}{3.43*10^22}$

$\rho=0.29$

Molar mass of (SiO2) for one formula unit

$M=28+32$

$M=60g/mol$

Therefore

There are 8Si atoms and 16 O atoms per unit cell

6 0

3 years ago

Burning wood in a fireplace is an example of what kind of energy conversion

Lunna [17]

Answer:

Potential energy

Explanation:

6 0

3 years ago

Read 2 more answers

What year will Aquarius be visible from Earth’s North Pole?

Minchanka [31]

Answer:

Aquarius beginning in the mid-3rd millennium. The north and south celestial poles are the two imaginary points in the sky where the Earth's ... In about 5,500 years, the pole will have moved near the position of the star ... The south celestial pole is visible only from the Southern Hemisphere.

Explanation:

3 0

3 years ago