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
Galina-37 [17]
3 years ago
8

A train increases its speed steadily from 10 m/s to 20 m/s in

Physics
1 answer:
rewona [7]3 years ago
3 0

Answer:

15m/s

Explanation:

add the two speeds and divide by 2

10+20=30

30/2=15

You might be interested in
Find the angle of refraction of a ray of light that enters a diamond (n=2.419) from air at an angle of 18.0° to the normal. ONLY
Tpy6a [65]

Answer:

n

Explanation:

hb

3 0
3 years ago
REAL ANSWER = BRAINLIST LOOK AT PICS ATTACHED
inysia [295]

Answer:

there are no pictures attached.

5 0
3 years ago
A piece of aluminum has a volume of 1.50 10-3 m3. the coefficient of volume expansion for aluminum is β = 69 ✕ 10-6 (°c)-1. the
Alex17521 [72]

Answer:

W = 3.12 J

Explanation:

Given the volume is 1.50*10^-3  m^3 and the coefficient of volume for aluminum is β = 69*10^-6 (°C)^-1. The temperature rises from 22°C to 320°C. The difference in temperature is 320 - 22 = 298°C, so ΔT = 298°C. To reiterate our known values we have:

β = 69*10^-6 (°C)^-1       V = 1.50*10^-3  m^3       ΔT = 298°C

So we can plug into the thermal expansion equation to find ΔV which is how much the volume expanded (I'll use d instead of Δ because of format):

dV = \beta V_{0} dT\\dV = (69*10^{-6})( C)^{-1} * (1.50*10^{-3})m^{3} * (298)C\\dV = 3.0843*10^-5

So ΔV = 3.0843*10^-5 m^3

Now we have ΔV, next we have to solve for the work done by thermal expansion. The air pressure is 1.01 * 10^5 Pa

To get work, multiply the air pressure and the volume change.

W = P * dV = (1.01 * 10^5)Pa * (3.0843*10^{-5})m^3\\W = 3.115143J

W = 3.12 J

Hope this helps!

4 0
3 years ago
An airplane is flying at a constant speed in a positive direction. It slows down when it approaches the airport where it's going
guapka [62]
Negative acceleration d. I think
6 0
3 years ago
6. What are 3 different evidences of evolution? How is each form used to provide evidence of evolution?
Cloud [144]

Answer:

Divergent - This type of evolution often occurs when closely related species diversify to new habitats. On a large scale, divergent evolution is responsible for the creation of the current diversity of life on earth from the first living cells. On a smaller scale, it is responsible for the evolution of humans and apes from a common primate ancestor.

Convergent - Convergent evolution causes difficulties in fields of study such as comparative anatomy. Convergent evolution takes place when species of different ancestry begin to share analogous traits because of a shared environment or other selection pressure. For example, whales and fish have some similar characteristics since both had to evolve methods of moving through the same medium: water.

Parallel evolution - Parallel evolution occurs when two species evolve independently of each other, maintaining the same level of similarity. Parallel evolution usually occurs between unrelated species that do not occupy the same or similar niches in a given habitat.

6 0
3 years ago
Other questions:
  • A merry-go-round rotates at the rate of 0.14 rev/s with an 84 kg man standing at a point 2.4 m from the axis of rotation. What i
    9·1 answer
  • A sprinter is advised to reduced his speed slowly after completing his race.why
    6·1 answer
  • Susan works 8 hours a day and makes $7.00 per hour. How much money does Susan earn in one week if she
    7·2 answers
  • A comet is traveling through space with speed 3.01 ✕ 104 m/s when it encounters an asteroid that was at rest. The comet and the
    8·1 answer
  • Using a simple machine, a student is able to lift a 500N weight by applying only 100N.
    13·1 answer
  • what voltage would produce a current of 100A through an aluminum wire that has a resistance of 3.44x10^-4 ohm?
    12·1 answer
  • A high-diver of mass 59.8 kg jumps off a board 10.0 m above the water. If, 1.00 s after entering the water his downward motion i
    7·1 answer
  • Change in v= 9.8 m/s2xt. The diagram shows a ball falling toward Earth in<br> a vacuum.
    8·2 answers
  • What is force ? <br>question for spammers hehe..​
    5·2 answers
  • Please select the word from the list that best fits the definition
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!