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
Alex787 [66]
3 years ago
7

A particle at 9 AM is moving towards the east at 4 ms At 12 noon, it changes its velocity and starts moving towards the north un

iformly at 4 ms the average acceleration of the particle during the interval 10 AM to 1 PM is a1, and the average acceleration of the particle during the interval 10 AM to 2 PM is a2 then.
Physics
1 answer:
nexus9112 [7]3 years ago
7 0

Answer:

Explanation:

Acceleration is the time rate of change of velocity.

Acceleration and velocity are vectors

If east and north are the positive directions, the east moving vector is reduced to zero and the north moving vector increases from zero to 4 m/s.

There are 3 hours or 10800 seconds between 10 AM and 1 PM

a1 = √((-4)² + 4²) / 10800 = (√32) / 10800 m/s² ≈ 4.2 x 10⁻⁴ m/s²

There are 14400 seconds between 10 AM and 2 PM

The velocity changes are still the same

a2 = √((-4)² + 4²) / 10800 = (√32) / 14400 m/s² ≈ 3.9 x 10⁻⁴ m/s²

You might be interested in
Sound is a type of mechanical wave and must have a medium through which to travel. Sound will move at different speeds when whic
Alex787 [66]
Hey there!

The answer would be B. The sound moves from air to water.

Sound travels through different mediums. It goes fastest in solids, a little slower in liquids, and slowest in air. Sound is a very fast wave, but remember that mediums can differ that. In a vacuum space, there is no sound at all. (ex. outer space)

Hope this helps !
5 0
3 years ago
Do we include signs if we calculate Electric field strength?
expeople1 [14]
Yes because if not people wouldn't understand how did you calculate electric field strength.
6 0
3 years ago
A train is moving along a horizontal track. A pendulum suspended from the roof makes an angle of 4° with the vertical. If g=10m/
nataly862011 [7]

Answer:

Train accaleration = 0.70 m/s^2

Explanation:

We have a pendulum (presumably simple in nature) in an accelerating train. As the train accelerates, the pendulum is going move in the opposite direction due to inertia. The force which causes this movement has the same accaleration as that of the train. This is the basis for the problem.

Start by setting up a free body diagram of all the forces in play: The gravitational force on the pendulum (mg), the force caused by the pendulum's inertial resistance to the train(F_i), and the resulting force of tension caused by the other two forces (F_r).

Next, set up your sum of forces equations/relationships. Note that the sum of vertical forces (y-direction) balance out and equal 0. While the horizontal forces add up to the total mass of the pendulum times it's accaleration; which, again, equals the train's accaleration.

After doing this, I would isolate the resulting force in the sum of vertical forces, substitute it into the horizontal force equation, and solve for the acceleration. The problem should reduce to show that the acceleration is proportional to the gravity times the tangent of the angle it makes.

I've attached my work, comment with any questions.

Side note: If you take this end result and solve for the angle, you'll see that no matter how fast the train accelerates, the pendulum will never reach a full 90°!

8 0
3 years ago
PLEASE HELP FAST
love history [14]

a. Independent variable:   <em>TIME </em>

b. Dependent variable:   <em>DISTANCE</em>

4 0
3 years ago
Which statement about thermal energy is true?
NNADVOKAT [17]

Answer:Thermal energy is a measure of a substance 's specific heat

Explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • In gym class you run 22 m horizontally, then climb a rope vertically for 6.2 m. What is the direction angle of your total displa
    14·2 answers
  • A metal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpend
    8·1 answer
  • A 1.0 m length of metal wire is connected to a battery, and a current of flows through it. What is the diameter of the wire? The
    15·1 answer
  • Which of the following is the most important skill for a human resource
    5·1 answer
  • A dielectric material is inserted between the charged plates of a parallel-plate capacitor. Do the following quantities increase
    12·2 answers
  • you (60 kg) are standing in a (500 kg) elevator that is moving upwards from a ground floor on a building what is the power ratin
    5·1 answer
  • Explain why the wave model of light cannot explain the energy emissions from a blackbody
    15·1 answer
  • a student compared two samples of matter he recorded the results in this chart which property do the two samples have in common
    7·1 answer
  • Suppose you want to make an interferometer with two slits to show the wave nature of light to your friends. The most convenient
    15·1 answer
  • He diagram shows a person holding a bow and arrow.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!