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
grandymaker [24]
3 years ago
7

One train is at the 20 Km position, another is at the 200Km position, both are approaching, the first with a speed of 30Kmh-1 an

d the second with a speed of 48 Kmh-1. If they leave at 7:12, what time do they cross? Answer: t = 2.30 H Time: 9:30 am.
Physics
1 answer:
nydimaria [60]3 years ago
7 0

Explanation:

The distance between them is 200 km − 20 km = 180 km.

The relative velocity is 30 km/h − (-48 km/h) = 78 km/h.

The time it takes is 180 km / (78 km/h) = 2.31 hours, or 2 hrs 18 min.

Therefore, the trains meet at 9:30 AM.

You might be interested in
A well chosen lifetime activity is something that should hold a person's interest for a long time.
Masteriza [31]

Answer:

true

Explanation:

as long as you are interested, you are happy

4 0
3 years ago
A downhill skier was able to move 560 meters in 25 seconds. What is the skier’s average speed? (Round your answer to the nearest
anastassius [24]
The average speed of a moving body is given by:
average speed = total distance / total time
average speed = 560 / 25
22.4 meters per second

The skier is traveling at an average velocity of 22.4 meters per second.
7 0
3 years ago
Read 2 more answers
Range of motion is the distance an object can travel when separated from another object. Please select the best answer from the
Lady_Fox [76]
Based on the given statement above, the correct answer would be FALSE. It is not true that range of motion is the distance an object can travel when separated from another object because range of motion or ROM is the distance--linear or angular--<span>that a movable object may normally travel while properly ATTACHED (not separated) to another. Hope this answer helps.</span>
7 0
3 years ago
Why is it important that radioisotopes used in diagnostic tests have short half-lives? 20 A) These radioisotopes have a greater
LiRa [457]

Answer:

Option B) This minimizes the harmful side effects of the radiations

Explanation:

Half-life is the time taken for the decay of an radio-active atom in which it disintegrates such that it becomes half of its value at the beginning.... The nuclei should be in active mode for a longer duration sufficient for the treatment of the condition but these nuclei should have a sufficient  shorter half life so that they don't get enough time to cause any  damage to the health of the person other than treating the cause.

A shorter half life gives the assurance that the radiation after the treatment will leave the body without getting accumulated and cause harm to the body cells and other organs.

8 0
3 years ago
Which of the following terms is correct when talking about energy?
vlabodo [156]

Answer:

C. Converting Energy

Explanation:

Hope this helped, Have a Wonderful Day!!

5 0
3 years ago
Read 2 more answers
Other questions:
  • Plz help me I will mark brainlieat Ques. Write down name and molecular formula of a
    10·1 answer
  • why does light look colorless and how is made (I know this just Wana see if anyone will get it correct )
    12·1 answer
  • Wonder Woman and Superman fly to an altitude of 1690 km , carrying between them a chest full of jewels that they intend to put i
    10·1 answer
  • In all chemical reactions, __________ and ____________ must be conserved. energy, matter atoms, heat enthalpy, energy
    11·1 answer
  • 3. A bird flying 4 m/s has 8 joules of kinetic energy. What is the mass of the bird?
    12·1 answer
  • How much heat is needed to melt 13.74 kg of silver that is initially at 20°C?
    15·1 answer
  • An exothermic reaction is taking place in a test tube what would you expect to feel when you touch the outside of the test tube
    12·1 answer
  • How has technology influenced theories over time?
    12·1 answer
  • A ball is thrown horizontally from the top of a building 14.9 m high. The ball strikes the ground at a point 107 m from the base
    15·1 answer
  • If you weighted 130 lbs on Earth how much would you weigh on the moon?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!