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
ratelena [41]
3 years ago
12

A driver starts from rest on a straight test track that has markers every 0.14 km. The driver presses on the accelerator and for

the entire period of the test holds the car at constant acceleration. The car passes the 0.14 km post at 8.0 s after starting the test.
(a) What was the car's acceleration?
(b) What was the car's speed as it passed the 0.14 km post?
Physics
1 answer:
kari74 [83]3 years ago
5 0

Answer:

(A) Constant acceleration will be a=1.479m/sec^2

(B) Velocity of the car when it passes 0.14 km is 20.349 m/sec

Explanation:

It is given that driver starts from rest so initial velocity of the driver u = 0 m/sec

Distance traveled s = 0.14 km = 140 m

Time taken to cross 0.14 km is 8 sec

So time taken t = 8 sec

(A) From second equation of motion s=ut+\frac{1}{2}at^2

So 140=0\times 8+\frac{1}{2}\times a\times 8^2

a=1.479m/sec^2

(B) From third equation of motion

v^2=u^2+2as

v^2=0^2+2\times 1.479\times 140

v^2=414.12

v = 20.349 m/sec

So speed of the car when it passed 0.14 km is 20.349 m/sec

You might be interested in
Twenty grams of a solid at 70°C is place in 100 grams of a fluid at 20°C. Thermal equilibrium is reached at 30°C.
zaharov [31]

Answer:

c. is more than that of the fluid.

Explanation:

This problem is based on the conservation of energy and the concept of thermal equilibrium

heat= m s \Delta T


m= mass

s= specific heat

\DeltaT=change in temperature

let s1= specific heat of solid and s2= specific heat of liquid

then

Heat lost by solid= 20(s_1)(70-30)=800s_1


Heat gained by fluid=100(s_2)(30-20)=1000s_2


Now heat gained = heat lost

therefore,

1000 S_2=800 S_1

S_1=1.25 S_2

so the specific heat of solid is more than that of the fluid.

8 0
3 years ago
Questions 15 out of 20
Olin [163]

Answer:

D

Explanation:

7 0
3 years ago
What did the results of photoelectric-effect experiment establish?
Bond [772]

Answer:

Thanks For Points Mark Me Brainliest Please

Explanation:

Electrons are emitted as soon as low-intensity, high-frequency light hits a metal surface.

A. Is It

7 0
3 years ago
Read 2 more answers
Robert is riding the Giant Drop at Great America. If
lora16 [44]

Explanation:

i hope this helps, its not the same person but its the same equation.

7 0
3 years ago
Proteins are created in the code of dna true or false
romanna [79]

Answer: True

The DNA code contains instructions needed to make the proteins and molecules essential for our growth, development and health

7 0
3 years ago
Other questions:
  • A certain type of D-cell battery that costs $0.50 is capable of producing 1.3 V and a current of 0.3 A for a period of 75 hours.
    9·1 answer
  • Kuiper Belt objects are composed of which substances? Select all that apply.
    7·1 answer
  • Which of the following statements regarding heuristics and empiricism is true? A. Heuristics allows a priori theoretical concep
    8·1 answer
  • A construction worker dropped a brick from a high scaffolding. How fast was? a. How fast was the brick moving after 4.0 s of fal
    6·1 answer
  • Carlos uses a rope to pull his car 30 m to a parking lot because it ran out of gas
    14·1 answer
  • Recall the thermal energy model you used earlier to simulate friction with the chemistry and physics books. How does heat travel
    7·2 answers
  • During World War I, the Germans had a gun called Big Bertha that was used to shell Paris. The shell had an initial speed of 0.88
    9·1 answer
  • A projectile is launched at an angle of 60° from the horizontal and at a velocity of
    15·1 answer
  • What happens in each of freud's stages?
    9·1 answer
  • A 1050 W carbon-dioxide laser emits light with a wavelength of 10μm into a 3.0-mm-diameter laser beam. What force does the laser
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!