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Feliz [49]
3 years ago
14

The average distance between the Sun and a certain planet is approximately 2.3 x 1014 inches. Which of the following is closest

to the average distance between the Sun and the planet, in kilometers? (1 kilometer is approximately 3.9 x 104inches.) (A) 7.1 x 10^8(B) 5.9 x 10^9(C) 1.6 x 10^10(D) 1.6 x 10^11(E) 5.9 x 10^11
Physics
1 answer:
Liono4ka [1.6K]3 years ago
8 0

Answer:

B. 5.9 X 10^9

Explanation:

For this question, we assume the following:

•2.3 x 1014 inches is actually 2.3 x 10^14 inches.

•3.9 x 104inches is actually 3.9 x 10^4inches

We now calculate thus;

The average distance in km would be 2.3 x 10^14/3.9 x 10^4

= 0.59 X 10^10.

Therefore, we have;

5.9 X 10^9km.

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On a straight road, a car speeds up at a constant rate from rest to 20 m/s over a 5 second interval and a truck slows at a const
IceJOKER [234]

Answer:

a)

Explanation:

  • Since the car speeds up at a constant rate, we can use the kinematic equation for distance (assuming that the initial position is x=0, and choosing t₀ =0), as follows:

        x_{fc} = v_{o}*t + \frac{1}{2}*a*t^{2}   (1)

  • Since the car starts from rest, v₀ =0.
  • We know the value of t = 5 sec., but we need to find the value of a.
  • Applying the definition of acceleration, as the rate of change of velocity with respect to time, and remembering that v₀ = 0 and t₀ =0, we can solve for a, as follows:

       a_{c} =\frac{v_{fc}}{t} = \frac{20m/s}{5s} = 4 m/s2  (2)

  • Replacing a and t in (1):

       x_{fc} = v_{o}*t + \frac{1}{2}*a*t^{2}  = \frac{1}{2}*a*t^{2} = \frac{1}{2}* 4 m/s2*(5s)^{2} = 50.0 m.  (3)

  • Now, if the truck slows down at a constant rate also, we can use (1) again, noting that v₀ is not equal to zero anymore.
  • Since we have the values of vf (it's zero because the truck stops), v₀, and t, we can find the new value of a, as follows:

       a_{t} =\frac{-v_{to}}{t} = \frac{-20m/s}{10s} = -2 m/s2  (4)

  • Replacing v₀, at and t in (1), we have:

       x_{ft} = 20m/s*10.0s + \frac{1}{2}*(-2 m/s2)*(10.0s)^{2} = 200m -100m = 100.0m   (5)

  • Therefore, as the truck travels twice as far as the car, the right answer is a).
7 0
3 years ago
The atomic number of Krypton si 36. if the mass number of a Krypton atom si 84, which table shows the number of subatómico insid
Elan Coil [88]

Answer:

A

Explanation:

You did not list the options. However, knowing the possible options from having seen the material myself - I can infer that the answer option is A. I apologize sincerely if this is wrong.

3 0
3 years ago
Can someone help me figure this out please?
Elina [12.6K]

Answer:

2/B

6/E

7/F

12/6

Explanation:

Hope this helps i dont know ither i will put if i think of them

8 0
3 years ago
What is the effect on the force if the mass is increased 3 times?
Andrei [34K]

Answer:

Force will increase 3 times

Explanation:

We know force is directly porpotional to acclereation, with the constant, m mass.

f = ma

So if we mass is increased 3 times the force will increase 3 times.

5 0
2 years ago
Physics.... how far away was the lightning bolt in meters
likoan [24]
To figure this out we need to multiply the time it took for the boy to hear thunder (8 seconds) by the speed of sound in air (340 m/s)

340 x 8 = 2720

The lightning bolt was 2720.00 meters away.
8 0
3 years ago
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