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astraxan [27]
3 years ago
5

SHOULD YOU TRY TO KEEP A "SPACE CUSHION" AROUND YOUR VEHICLE WHENEVER POSSIBLE? A. Yes, when another driver makes a mistake, you

will have time to react B. No, space cushions are unnecessary. They take up valuable space on the freeway C. No, someone may try to crowd in front of you D. Yes, but only on city streets
Physics
1 answer:
Veronika [31]3 years ago
3 0

Answer:

A. Yes, when another driver makes a mistake, you will have time to react

Explanation:

Yes it is good to make space cushion between two cars because due to some urgency when front vehicle applied brakes then the driver of the rear car will definitely take some time to react.

This reaction time may be between 0.5 s to 0.8 s for different people

so the rear car will move with same speed for above reaction time and it will cover the cushion distance between two cars

If we will not maintain this cushion distance between two cars then we can see that the two cars will collide and that may cause many accidents

so it is correct statement and correct option would be

A. Yes, when another driver makes a mistake, you will have time to react

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Why can't heat be transferred between two objects that have the same temperature
Inessa [10]

Answer: Because temperature is a measure of the average kinetic energy of the atoms or molecules in the system. The zeroth law of thermodynamics says that no heat is transferred between two objects in thermal equilibrium; therefore, they are the same temperature.

Explanation:9 (- _ -)

3 0
3 years ago
A person of mass 55 kg swings on a rope length 4 m from rest (when the rope makes an angle of 30 degrees with the vertical) and
vovangra [49]

Answer:

θ = 19.66°

Explanation:

To determine the angle that the rope makes with the vertical for the two people, you first take into account the potential energy of the first person before he swings on the rope:

U=mgh

h: distance to the ground

g: gravitational acceleration = 9.8m/s^2

m: mass of the first person = 55 kg

In the image attache below you can notice that the height h is:

h=4-4cos(30\°)=0.53m

Then, the potential energy is:

U=(55kg)(9.8m/s^2)(0.53m)=285.67J

When the first person picks up the second person (when the rope is exactly vertical), all the potential energy becomes kinetic energy. Next, when both people reaches the maximum height h' the energy must be equal to the initial potential energy of the first person:

U'=(m_1+m_2)gh'=285.67\ J

From the previous equation you can get h':

h'=\frac{285.67J}{(55kg+70kg)(9.8m/s^2)}=0.2332m

Finally, you obtain the angle between the rope at the height h,' and the vertical, by calculating the following:

h'=4-4cos(\theta)\\\\\theta=cos^{-1}(\frac{4-h'}{4})=cos^{-1}(\frac{4-0.2332}{4})=19.66\°

hence, the angle between the rope and the vertical, when the two people are in the rope is 19.66°

8 0
3 years ago
Pls help urgent Refer to the image for question
Temka [501]

Answer:

C

Explanation:

Most probable exchange of ions occurs for option C.

3 0
3 years ago
A probe orbiting Venus exerts a gravitational force of 2.58 × 10^3 N on Venus. Venus has a mass of 4.87 × 10^24 kg. The mass of
Crazy boy [7]
So this is the info that's given to us:
m1 = 4.87 x 10^24 kg
m2 = 4.87 x 10^24kg
F = 2.58 x 10^3 N

Now we can use this equation to solve: f_g= \frac{Gm_1m_2}{r^2}

You may be asking what g is. Well, it is equal to 6.67x10^-11 m3 /kg s2. G is gravitational constant. So :

2.58 x 10^3 = \frac{6.67x10^{-11} * 4.87 x 10^{24} * 655}{r^{2}} 

As you can see we only have one variable, so we solve for r! 

r = 9.08 x 10^6 km

I hope this helps you out. I remember when I was first learning Newton's law<span> of universal </span><span>gravitation and I had some trouble. But with some practice, I got better. =) </span>

6 0
3 years ago
a hammer is swung so it exerts a 400 N force on a nail. if the hammer and nail are in contact for 0.35 seconds how much impulse
Anuta_ua [19.1K]

Answer:

140Ns

Explanation:

From Newton's 2nd law of motion

F = ma

F = m∆v/t

==> Ft = m∆v

impulse = Ft = 400 × 0.35 = 140Ns

8 0
3 years ago
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