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Marianna [84]
3 years ago
14

Describe your motion in terms of velocity and acceleration as you ride in a car down the street, come to a red light, wait for t

he green light and then start off again.
Physics
2 answers:
aleksandr82 [10.1K]3 years ago
7 0
Ride in a car down the street: constant velocity,
come to a red light: negative acceleration,
 wait for the green light: zero velocity,
<span>start off again: </span>positive acceleration
mrs_skeptik [129]3 years ago
7 0

Answer:

Riding a car down the street: Velocity is constant and acceleration is zero.

Coming to a red light: Velocity decreases and acceleration is negative.

Waiting for the green light: Velocity is zero and acceleration is zero.

Starting off again: Velocity increases and acceleration is positive.

Explanation:

Velocity is a change in position, and acceleration a change in velocity.

When we have a positive acceleration, velocity will increase, and when we have negative acceleration, velocity will decrease.

Likewise, since we can only observe changes in position, an increase in velocity will tell us that the acceleration is positive, and a decrease in velocity will tell us that the acceleration is negative.

When acceleration is zero, the object in motion is said to be at rest, that is, at constant velocity. It can be zero (at the red light), or any other constant number (riding down the street).

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Comparativo entre a máquina a vapor de Neu carmen e James Watt!
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Answer:

jame watt

Explanation:

James Watt tiña máis importancia que outro home

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3 years ago
A human being can be electrocuted if a current as small as 55 mA passes near the heart. An electrician working with sweaty hands
evablogger [386]

Answer:

The lethal voltage for the electrician under those conditions is 126.5 V.

Explanation:

To discover what is the lethal voltage to the electrician we need to find out what is the voltage that produces 55 mA = 0.055 A when across a resistance of 2300 Ohms (Electrician's body resistancy). For that we'll use Ohm's Law wich is expressed by the following equation:

V = i*R

Where V is the voltage we want to find out, i is the current wich is lethal to the electrician and R is his body resistance. By applying the given values we have:

V = 0.055*2300 = 126.5 V.

The lethal voltage for the electrician under those conditions is 126.5 V.

4 0
3 years ago
Read 2 more answers
What is the magnitude of the electric force between a proton and an electron when they are at a distance of 4.09 angstrom from e
Zinaida [17]

Answer:

F=1.38*10^{-9}N

Explanation:

According to Coulomb's law, the magnitude of the electric force between two point charges is directly proportional to the product of the magnitude of both charges and inversely proportional to the square of the distance that separates them:

F=\frac{kq_1q_2}{d^2}

Here k is the Coulomb constant. In this case, we have q_1=-e, q_2=e and d=4.09*10^-10m. Replacing the values:

F=\frac{8.99*10^{9}\frac{N\cdot m^2}{C^2}(-1.6*10^{-19}C)(1.6*10^{-19}C)}{(4.09*10^{-10})^2}\\F=-1.38*10^{-9}N

The negative sign indicates that it is an attractive force. So, the magnitude of the electric force is:

F=1.38*10^{-9}N

5 0
3 years ago
it is determined that a certain light wave has a wavelength of 3.012x10^-12 m. the light travels at 2.99x10^8 m/s. what is the f
Dahasolnce [82]

Answer:

9.93\times 10^{19}Hz

Explanation:

Speed of light is the product of its wavelength and frequency, expressed as

S=fw

Where s represent speed, f is frequency while w is wavelength

Making f the subject of the formula then

f=s/w

Substituting 2.99x10^8 m/s for s and 3.012x10^-12 m for w then

f=\frac {2.99\times 10^{8}}{3.012\times 10^{-12}}=9.926958831341\times 10^{19}\\f\approx 9.93\times 10^{19}Hz

Therefore, the frequency equals to 9.93\times 10^{19}Hz

4 0
3 years ago
A 750-newton person stands in an elevator that isaccelerating downward. The upward force of theelevator floor on the person must
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