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
gregori [183]
2 years ago
13

A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 10.0 min

at 75.0 km/h, 6.0 min at 95.0 km/h, and 45.0 min at 40.0 km/h and spends 40.0 min eating lunch and buying gas.(a) Determine the average speed for the trip.
(b) Determine the distance between the initial and final cities along the route.
Physics
1 answer:
earnstyle [38]2 years ago
5 0

Answer:

a)  v = 0.515 km / min ,   b)  x_total = 52 km

Explanation:

The measured speed is defined by the distance traveled between the time

         v = \frac{\Delta x}{\Delta t}

In this case they give us the speed in several time intervals

let's find the distance traveled in each interval

a) Goes at 75 km/h for 10 min

        v = \frac{x}{t}x / t

         x₁ = v t

let's reduce speed to km / min

         v₁ = 75 km / h (1h / 60 min) = 1.25 km / min

the distance traveled in this time is

        x₁ = 1.25 10

        x₁ = 12.5 km

b) goes to v = 95 km / h for 6 min

        v = 95 km / h (1h 60 min) = 1.5833 km / min

the distance traveled is

        x₂ = v₂2 t

        x₂ = 1.58333 6

        x₂ = 9.5 km

c) goes to v = 40 km / h for 45.0 min

         v₃ = 40 km / h (1 h / 60min) = 0.6667 km / min

         x₃ = 0.6667 45

         x₃ = 30 km

d) t = 40 min, stopped

         x₄ = 0

A) let's calculate the average speed of the trip

          v =\frac{x_{1}+x_{2}+x_{3}+x_{4}   }{t_{1}+t_{2}+t_{3}+t_{4} }

          v = (12.5 +9.5 +30 +0) / (10 +6 +45 +40)

          v = 52/101

         v = 0.515 km / min

B) the distance between the two cities is

        x_total = x₁ + x₂ + x₃

        x_total = 12.5 +9.5 + 30

        x_total = 52 km

You might be interested in
The nucleus is found in the center of an atom options: True False
AfilCa [17]
It’s true all the way. It’s true
8 0
2 years ago
Read 2 more answers
The object distance for a concave lens is 8.0 cm, and the image distance is 12.0 cm. The height of the object is 4.0 cm. What is
swat32
The answer for this question, If I am correct, should be answer "D".
3 0
3 years ago
Read 2 more answers
Help pleasessssssssssssss
irinina [24]

Sorry I had the answer but it wont let me type numbers :(.:

5 0
2 years ago
(b) A piece of wood of volume 0.6 m² floats in water. Find the volume
enot [183]

Answer:

Explanation:

Let the volume below water be v . Then

buoyant force = v d g where d is density of water , g is acceleration due to gravity

= v x 1000 x g

weight of wood piece = volume x density of wood x g

= .6 x 600 x g

for equilibrium while floating

buoyant force = weight

= v x 1000 x g  =  .6 x 600 x g

v = .36 m²

volume above water or volume exposed = .6 - .36

= .24 m²

When immersed completely ,

buoyant force = .6 x 1000 x 9.8

= 5880 N

weight of wood

=  .6 x 600 x g

= 3528 N

buoyant force is more than the weight . In order to equalise them for floating with full volume in water

weight required = 5880 - 3528

= 2352 N.

6 0
3 years ago
I need help with this question ASAP I am on a timer
Tom [10]
First box and third box !
4 0
2 years ago
Other questions:
  • What is the frequency of a sound wave commonly called?
    7·1 answer
  • Yes this nees helppppppppppppppp
    9·1 answer
  • What determines the quality of a conductor
    11·1 answer
  • An equation for the frictional pressure loss Δ p (inches H2O) in a circular duct of inside diameter d (in.) and length L (ft) fo
    10·1 answer
  • Determine the maximum height and range of a projectile fired at a height of 6 feet above the ground with an initial velocity of
    15·1 answer
  • The _____(height or width) of a sound wave determines its _____(loudness or pitch).
    8·2 answers
  • A car travels forward with constant velocity. It goes over a small stone, which gets stuck in the groove of a tire. The initial
    11·1 answer
  • A bird is flying in a room with a velocity field of . Calculate the temperature change that the bird feels after 9 seconds of fl
    10·1 answer
  • How do think animals grow from babies to adults
    7·1 answer
  • Please guys help me plz for god sake plz plz guys plz plz plz i will mark u as a brainlist plz​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!