A circuit has a current of 1.2 A. If the voltage decreases to one-third of its original amount while the resistance remains

You are driving along the New York State Thruway in a line of cars all travelling at a constant speed of 108.5 km/hr. The car in

IgorC [24]

Answer:

Car first should be 30.13 m behind the second car.

Explanation:

Given that,

Constant speed = 108.5 Km/hr

Time = 1 sec

Let the distance covered by second car S and by first car S'

We need to calculate the distance covered by second car

Using equation of motion

$S=ut-\dfrac{1}{2}at^2$ .....(I)

The distance covered by first car to avoid collision

$S''=S'+S$

Put the value into the formula

$S'+S=ut+ut-\dfrac{1}{2}at^2$ ...(II)

We need to calculate the distance covered by first car

Using equation (I) and (II)

$S'=ut$

Put the value into the formula

$S'=108.5\times\dfrac{5}{18}\times1$

$S'=30.13\ m$

Hence, Car first should be 30.13 m behind the second car.

7 0

3 years ago

You are investigating the report of a UFO landing in an isolated portion of New Mexico, and encounter a strange object that is r

SIZIF [17.4K]

Answer: 5 m

Explanation:

We have the following data:

$I_{1}=0.11 W/m^{2}$ is the intensity of the sound at 7.5 m from the source

$r_{1}=7.5 m$ is the distance at which the intensity $I_{1}$ was measured

$I_{2}=1 W/m^{2}$ is the intensity of the sound at $r_{2}$ from the source

We have to find $r_{2}$

Since the object is radiating the signal uniformly in all directions, we can use the <u>Inverse Square Law for Intensity:</u>

$\frac{I_{1}}{I_{2}}=\frac{r_{2}^{2}}{r_{1}^{2}}$

Isolating $r_{2}$ :

$r_{2}=r_{1}\sqrt{\frac{I_{1}}{I_{2}}}$

$r_{2}=7.5 m\sqrt{\frac{0.11 W/m^{2}}{1 W/m^{2}}}$

$r_{2}=2.48 m$ This is the distance at which the intensity is the "threshold of pain"

Now, we have to substract this value to $r_{1}$ to find how much closer to the source can we move:

$r_{1}-r_{2}=7.5 m - 2.48 m=5.02 m \approx 5 m$

3 0

3 years ago

Read 2 more answers

How do you find period when you have frequency

nydimaria [60]

Period and frequency are mutual reciprocals.

Period = 1 / frequency .

Frequency = 1 / period

(Frequency) x (Period) = 1

8 0

3 years ago

How is it possible for two objects to experience a collision that results in different accelerations?

den301095 [7]

Two colliding objects will exert equal forces upon each other. If the objects have different masses, then these equal forces will produce different accelerations.

3 0

3 years ago

illustrate the difference between a neutral object, a positively charged object, and a negatively charged object

Feliz [49]

Answer:

A neutral object has the same charge. A positively charged object have positive charges called electrons. A negatively charged object have negative charges called protons.

Diagram of each down below -

3 0

3 years ago