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
kolbaska11 [484]
2 years ago
8

A train travels 67 kilometers in 1 hours, and then 81 kilometers in 5 hours. What is its average speed?

Physics
1 answer:
Naddika [18.5K]2 years ago
4 0
Answer: 24.7 km/h

Explanation:

1) Average speed definition and formula

The average speed is the total distance run divided by the time elapsed:

S = distance / time

2) Distance 1 = 67 km

3) Distance 2 = 81 km

4) Total distance traveled = 67 km + 81 km = 148 km

5) time 1 = 1 hour

6) time 2 = 5 hours

7) total time = time 1 + time 2 = 1 h + 5 h = 6 h

8) Average speed:

S = 148 km / 6 h = 24.7 km/h


You might be interested in
A playground merry-go-round of radius 2.00 m has a moment of inertia I = 275 kg · m2 and is rotating about a frictionless vertic
ryzh [129]

Answer:

0.2932 rad/s

Explanation:

r = Radius = 2 m

I_i = Initial angular momentum = 275\ kgm^2

\omega_i = Initial angular velocity = 14 rev/min

I_f = Final angular momentum

\omega_f = Final angular velocity

Here the angular momentum of the system is conserved

I_i\omega_i=I_f\omega_f\\\Rightarrow 275\times 14\times \dfrac{2\pi}{60}=(275+275(2)^2)\omega_f\\\Rightarrow \omega_f=\dfrac{275\times 14\times \dfrac{2\pi}{60}}{275+275(2)^2}\\\Rightarrow \omega_f=0.2932\ rad/s

The final angular velocity is 0.2932 rad/s

7 0
3 years ago
As a substance melts, heat energy is used to break the connections between molecules, and temperature __________ until all melti
mario62 [17]
Temperature stays the same
4 0
2 years ago
Density=2g/mL and volume=20mL what is mass
leva [86]

Answer:

40g

Explanation:

Mass = density x volume

= 2 x 20

= 40g

8 0
3 years ago
Read 2 more answers
In the picture at left. The launch height is 10m ball B mass 5kg has a launch velocity of 12 m/s and ball A mass 8 kg has a laun
Hitman42 [59]

Answer:

24

Explanation:

8 0
3 years ago
Which statement is true for a sound wave entering an area of warmer air?
kherson [118]
The appropriate response is letter D. The wave ventures slower and with an expanded wavelength when a sound wave entering a range of hotter air. Hotter air implies less thick, so the wave ought to back off.

I hope the answer will help you, feel free to ask more in brainly. 
4 0
2 years ago
Read 2 more answers
Other questions:
  • Megan rode the bus to school, which is located 8 kilometers from her home. If Megan's frame of reference is her house, and it to
    7·1 answer
  • How do mountain glaciers and continental glaciers differ in terms of dimensions, thickness and patterns of movement?
    7·1 answer
  • The hardest known natural material is _____.
    12·2 answers
  • Two internal factors that are important in advancing the cell cycle are
    10·1 answer
  • Mass number of an atom with 11 protons
    14·1 answer
  • A 9-μC positive point charge is located at the origin and a 6 μC positive point charge is located at x = 0.00 m, y = 1.0 m. Find
    7·1 answer
  • Which of the following are correct statements about the way an atom is put
    5·1 answer
  • The velocity of a given wave remains the same while the wavelength increases. What happens to the frequency of the wave?
    13·1 answer
  • Which language style would be most appropriate for the given situation?
    13·1 answer
  • Lab: Waves and Diffraction<br> Assignment: Lab Report<br> Anyone have this completed
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!