All categories

3 years ago

If a car is traveling at an average speed of 60 kilometers per hour how long does it take to travel 12 kilometers

Physics

1 answer:

lara31 [8.8K]3 years ago

5 0

Answer:

The time taken to travel is, t = 12 minutes

Explanation:

Given data,

The speed of the car, v = 60 km/h

The distance of travel, d = 12 km

The time taken for the travel is t = ?

The speed is defined as the distance divided by the time taken to travel. The formula for speed is,

v = d/t

∴ t = d/v

t = 12 km / 60 km/h

t = 0.2 h

t = 12 minutes

Hence, the time taken to travel is, t = 12 minutes.

You might be interested in

A centrifuge is a common laboratory instrument that separates components of differing densities in solution. This is accomplishe

melamori03 [73]

Answer:

$a_r=389\ rev.s^{-2}$

$n=58350 rev$

Explanation:

Given:

time of constant deceleration, $t=10\ s$

initial angular speed, $N_i=3890\ rpm\$

<u>Using equation of motion:</u>

$N_f=N_i+a_r.t$

$0=3890+a_r\times 10$

$a_r=389\ rev.s^{-2}$

Using eq. of motion for no. of revolutions, we have:

$n=N_i.t+\frac{1}{2} a_r.t^2$

$n=3890\times 10+0.5\times 389\times 100$

$n=58350\ rev$

8 0

3 years ago

A cube that is 20 nanometer on an edge contains 399,500 silicon atoms, and each silicon atom has 14 electrons and 14 protons. In

Sergeu [11.5K]

Answer:

Total 3 holes are available for conduction of current at 300K.

Explanation:

In order to develop a semiconductor, two type of impurities can be added as given below:

N-type Impurities: Pentavalent impurities e.g. Phosphorous, Arsenic are added to have an additional electron in the structure. Thus a pentavalent impurity creates 1 additional electron.
P-type Impurities: Trivalent impurities e.g. Boron, Aluminium are added to have a positive "hole" in the structure. Thus a trivalent impurity creates 1 hole.

Now for estimation of extra electrons in the impured structure is as

$N_{electrons-free}=n_{pentavalent \, atoms}\\N_{electrons-free}=4\\$