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
Katarina [22]
3 years ago
8

A train moves at constant velocity of 90km/h. How far will it go in 0.25h.

Physics
1 answer:
enot [183]3 years ago
8 0
In a quarter of an hour it will travel 1/4 x 90 = 22.5Km
You might be interested in
A mass of 250 N is on a piston of 2.0 m^2. What force is needed to lift this piston if the area of the second piston is 0.5 m^2?
prohojiy [21]

Answer:

<h3>62.5N</h3>

Explanation:

The pressure at one end of the piston is equal to the pressure on the second piston.

Pressure = Force/Area

F1/A1 = F2/A2

Given

F1 = 250N

A1 = 2.0m²

A2 = 0.5m²

F2 = ?

Substituting the given values in the formula;

250/2 = F2/0.5

cross multiply

250*0.5 = 2F2

125 = 2F2

F2 = 125/2

F2 = 62.5N

Hence the  force needed to lift this piston if the area of the second piston is 0.5 m^2 is 62.5N

8 0
3 years ago
An airplane propeller is rotating at 1900 rpm (rev/min).
alexandr1967 [171]

Answer:

See explanation

Explanation:

We have to convert to angular velocity in rads-1 as follows;

Angular velocity in rad/s = 2π/60 × 1900 rpm = 199 rad/s

Given that

angular velocity =angle turned /time taken

Time taken = angle turned/angular velocity

Converting 35° to radians we have;

35 × π/180 = 0.61 radians

Time taken = 0.61 radians/199 rad/s

Time taken = 0.0031 seconds

3 0
3 years ago
How does what happens to the particles in a substance during melting differ from what happens during freezing?
sasho [114]
When in the melting process particles start to move more freely when in the freezing process particles tend to slow and vibrate in place
8 0
3 years ago
Scientists use radioactive decay to measure
UNO [17]

Answer:

"Scientist use radioactive decay to measure the age of a rock or fossil."

Explanation:

"To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events."

5 0
3 years ago
Read 2 more answers
What is the momentum of a vehicle that has a mass of 800 kg and is moving at a velocity of 5 m/s
yarga [219]

Answer:

4000 kg.m/s

Explanation:

p=mv

m=800 kg

v=5 m/s

p=(800)(5)= 4000 kg.m/s

3 0
3 years ago
Other questions:
  • The three types of seismic waves produced by an earthquake are primary, secondary, and
    12·2 answers
  • Water that flows from behind a large dam can cause machines to produce electricity. What change takes place?
    13·1 answer
  • How are igneous rocks formed?<br> step by step please.
    5·1 answer
  • Define Potential Difference ​
    9·1 answer
  • The food calorie, equal to 4186 J, is a measure of how much energy is released when food is metabolized by the body. A certain b
    6·1 answer
  • Which of the following best describes this Image?
    5·2 answers
  • Human laws are more important than natural laws for human why?
    5·1 answer
  • The height of a flagpole is 8.5 meters tall. If the length of the meter stick shadow is 1.5 meters long, what would be the lengt
    12·1 answer
  • 14. Which one of the following pictures shows the object that is the most dense? *
    13·1 answer
  • HELP MY GRADES-
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!