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Elena L [17]
2 years ago
6

1. A drag racer accelerates from rest at 18ft/sec^2. How long does it take to acquire a speed of 60mph? What is required?

Physics
1 answer:
nignag [31]2 years ago
6 0

(1) The time taken for the drag racer to accelerate is 4.89 s

(2) The speed of the contestant (a) in feet per second is 30.89 ft/s (b) in miles per hr is 21.12 miles per hr.

(1) To calculate the time required to accelerate 18 ft/sec² from rest to a velocity of 60 mph, we use the formula below.

Formula:

  • t = (v-u)/a........... Equation 1

Where:

  • t = time
  • v = Final velocity
  • u = initial velocity
  • a = acceleration.

From the question,

Given:

  • a = 18 ft/sec² = (18×0.3048) = 5.4864 m/s²
  • v = 60 mph = (60×0.44704) = 26.82 m/s
  • u = 0 m/s ( from rest)

Substitute these values into equation 1

  • t = (26.82-0)/5.4864
  • t = 4.89 seconds

(2) To calculate the speed of the contestant, we use the formula below

Formula:

  • s = d/t............ Equation 1

Where:

  • s = speed of the contestant
  • d = distance
  • t = time.

From the question,

Given:

  • d = 100 m
  • t = 10.6 s

Substitute these values into equation 1

  • s = 100/10.6
  • s = 9.43 m/s

(a) In feet = (9.43/0.3048) = 30.94 ft/s

(b)  in miles per hr = (9.43×2.24) = 21.12 miles per hr

Hence, (1) The time taken for the drag racer to accelerate is 4.89 s (2) The speed of the contestant (a) in feet per second is 30.89 ft/s (b) in miles per hr is 21.12 miles per hr.

Learn more about speed here: brainly.com/question/4931057

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Answer:

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Explanation:

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P=\frac{W}{t}

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7 0
3 years ago
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MrRissso [65]

Answer:

B

Explanation:

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and in the nucleus of an atom, there are protons and neutrons so you can see that A is not the answer

if you see the periodic table, you will know that the number of electrons and protons are equal, so the charges cancel each other out, hence the charge of an atom will be neutral

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instead, write, the it is neutral

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1. Mr. Ure has a mass of 65 kg, due to the fact that he is WAY too skinny! What is the force of Earth's gravity on him?
shepuryov [24]

1.

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force of earth's gravity on Mr. Ure is given as

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2.

F = force of gravity on car = 3050 N

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force of gravity on car is given as

F = mg

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3.

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force of earth's gravity on Mr. Rees is given as

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__________ helps us adapt to our environment. It also generally __________ with age. A. Plasticity . . . decreases B. Developmen
Nana76 [90]
Not sure this is a physics question (probably biology).
Anyway, the correct answer is A):
"Plasticity helps us to adapt to our environment. It also generally decreases with age".
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