1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sweet-ann [11.9K]
3 years ago
5

Hw2-2 - show all your work, including the equation, express all answers in base units, (m, m/s, m/s2), unless stated otherwise i

n problem. a sprinter accelerates from rest to 10.5 m/s in 1.35 sec. what is her acceleration . . . in m/s2 km/hr2 a certain drag racer can accelerate from 0 to 60.0 km/hr in 5.4 sec. what is its acceleration in m/s2? how far, in meters, will it travel during this acceleration? how much time would it take to go 0.25 km if it could accelerate at this rate the entire time? an automobile can increase its speed uniformly from 25.0 to 55.0 km/h in 30.0 seconds. a bicycle rider uniformly speeds up to 30.0 km/h from rest in 0.5 min. calculate their accelerations. a rocket rises from rest with constant acceleration to an altitude of 85.0 km, at this point it has a speed of 2.8 km/s what is the acceleration of the rocket? how long does the ascent take?
Physics
1 answer:
Papessa [141]3 years ago
4 0
The useful equations here are derived equations for rectilinear motion at constant acceleration:

a = (v - v₀)/t
2ax = v² - v₀²
x = v₀t + 0.5at²

1.  Since it starts from rest, v₀ = 0. Then, v = <span>10.5 m/s and t=1.35 s
     a = (10.5 - 0)/1.35 = 7.78 m/s</span>²
     a = 7.78 m/s²*(1 km/1000 m)*(3,600 s/ 1 h)² = 100,828.8 km/h²

2. v₀ = 0; v = 60 km/h; t=5.4 s 
    a = [60 km/h*(1000 m/1km)*(1 h/3600 s) - 0]/5.4 s = 3.09 m/s²

3. Using the acceleration and velocities in #2, we can determine the distance     by the formula: 2ax = v² - v₀²
    2(3.09 m/s²)x = [60 km/h*(1000 m/1km)*(1 h/3600 s)]² - (0 m/s)²
    Solving for x,
    x = 44.95 m

4. Using acceleration in #2 and v₀ = 0, the time would be
    x = v₀t + 0.5at²
    0.25 km * 1,000 m/1 km = (0)(t) + (0.5)(3.09 m/s²)(t²)
    Solving for t,
    t = 12.72 seconds

5. Acceleration of automobile:
   a = [(55 km/h - 25 km/h)*(1,000 m/1 km)*(1 h/3,600 s)]/30 s
   a = 0.278 m/s²
<span>
   </span>Acceleration of bicycle:
   a = [(30 km/h - 0 km/h)*(1,000 m/1 km)*(1 h/3,600 s)]/(0.5 min * 60 s/1 min)
   a = 0.278 m/s²
<span>
6. x = 85 km or 85,000 m; v</span>₀ = 0 m/s; v = 2,800 m/s
    2ax = v² - v₀²
    2a(85,000 m) = (2,800 m/s)² - 0²
    a = 46.12 m/s²

7. Using the data given and acceleration in #6,
   x = v₀t + 0.5at²
   85,000 m = 0*t + 0.5(46.12 m/s²)(t²)
   Solving for t,
   t = 60.71 seconds
You might be interested in
A cat pushes a mouse horizontally on a frictionless floor with a net force of 1.0 N 1.0N1, point, 0, start text, N, end text for
vesna_86 [32]

Answer: 3

Explanation:

8 0
3 years ago
As scientists research, they often find information that does not fit with current theories. What happens when new, contradictor
timofeeve [1]
The correct answer is "C". 'Old theories are adjusted to incorporate all old new information.' This makes the most sense, regarded the old and new information should be taken into consideration.

I hope this helped you!

Brainliest answer is always appreciated!
8 0
3 years ago
Read 2 more answers
A 250 kg cart is at the top of a hill that is 32 m high, what is its potential energy?
atroni [7]

Answer:

<h2>80,000 J</h2>

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 250 × 10 × 32

We have the final answer as

<h3>80,000 J</h3>

Hope this helps you

3 0
3 years ago
The area of land where water is drained downhill into a body of water is known as a drainage basin, or _______.
GenaCL600 [577]
Water sheds i hope this helps give me a brainiest answer

6 0
3 years ago
Read 2 more answers
A 10000 N net force is accelerating a car at a rate if 5.5 m/s^2. What is the cars’s mass?
lianna [129]

Answer:

1800 kg

Explanation:

Newton's second law:

F = ma

10000 N = m (5.5 m/s²)

m ≈ 1800 kg

8 0
3 years ago
Read 2 more answers
Other questions:
  • 1. Discuss some of the dangers and obstacles that Nyad faced when sw
    14·1 answer
  • action and reaction are equal in magnitude and opposite in direction then , why do not they balance each other​
    9·1 answer
  • Explain why an iron nail that is stuck to a magnet can pick up a paperclip
    10·2 answers
  • An astronaut in a spacecraft looks out her window and observes a comet travel in the opposite direction at a relative speed of 2
    8·2 answers
  • Why does a round pizza come in a square box? Random questions
    5·2 answers
  • How are the wavelengths of light emitted?
    9·1 answer
  • Which best describes the motion of the object between 1
    11·1 answer
  • Which activity performed by a medical professional is primarily based on understanding of physics?
    8·2 answers
  • Explain what happens to the path of light as it hits a piece of black paper, a glass mirror, and a glass
    13·1 answer
  • You see the moon rising, just as the sun is setting. What phase is the moon in?.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!