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
noname [10]
3 years ago
9

Betty weighs 420 n and she is sitting on a playground swing seat that hangs 0.40 m above the ground. tom pulls the swing back an

d releases it from rest when the seat is 1.0 m above the ground. how fast is betty moving when the swing passes through its lowest position
Physics
1 answer:
Svet_ta [14]3 years ago
8 0
Weight = mass * gravity
420 = mass * 9.8
mass of Betty = 42.857 kg

Difference in height = 1 - 0.45 = 0.55 meters

Total energy = Kinetic energy + potential energy

At the highest point, the kinetic energy is zero while the potential energy is maximum, therefore, we can get the total energy as follows:
Total energy = 0 + mgh
Total energy = 42.857*9.8*0.55 = 231 Joules

At the lowest point, the potential energy is zero while the kinetic energy is maximum. Therefore:
Total energy = 0.5 * m * (v)^2 + 0
231 = 0.5 * (42.857) * (velocity)^2
(velocity)^2 = 10.78
velocity = 3.28 meters/sec
You might be interested in
Which change increases the electric force between objects?
Brrunno [24]
Well, the force is proportional to the product of the charges
on the two objects.  So if the objects are already negatively
charged distance between them is unchanged, then adding
electrons to either or both objects would increase the forces
between them.

3 0
2 years ago
Read 2 more answers
A car, X, with a mass of 1500 kg is moving west with an acceleration of 0.50 m/s2. A second car, Y, of equal mass is heading eas
ehidna [41]

Answer:

A

Explanation:

8 0
3 years ago
The period of a pendulum is measured 16 times. The average value of the period over these 16 trials is calculated to be 1.50 sec
marin [14]

Answer:

The additional trials needed is 48 trials

Explanation:

Given;

initial number of trials, n = 16 trials

the standard deviation, σ = 0.24 s

initial standard error, ε = 0.06 s

The standard error is given by;

\epsilon = \frac{\sigma}{\sqrt{n} }

To reduce the standard error to 0.03 s, let the additional number of trials = x

0.03= \frac{0.24}{\sqrt{n+x} } \\\\0.03= \frac{0.24}{\sqrt{16+x} }\\\\0.03\sqrt{16+x} = 0.24\\\\\sqrt{16+x} = \frac{0.24}{0.03} \\\\\sqrt{16+x} = 8\\\\16+x = 8^2\\\\16+x = 64\\\\x = 64 -16\\\\x = 48 \ trials

Therefore, the additional trials needed is 48 trials.

6 0
3 years ago
If you were asked to describe metals and magnetism you could say?
Anettt [7]
Some metals having unpaired electrons contain a strong magnetic response, i.e, they can be magnetized by an external magnetic field.
5 0
3 years ago
1. Is the relationship between velocity and centripetal force a direct, linear relationship or is it a nonlinear square relation
Svetllana [295]

Answer:

non linear square relationship

Explanation:

formula for centripetal force is given as

a = mv^2/r

here a ic centripetal acceleration , m is mass of body moving in circle of radius r and v is velocity of body . If m ,and r are constant we have

a = constant × v^2

a α v^2

hence non linear square relationship

7 0
3 years ago
Other questions:
  • Stiind ca de la cea mai apropriata stea din afara Sistemului noatru Solar lumina ar ajunge in 4,3ani in ce unitati de masura con
    9·1 answer
  • Why should a tennis player "swing through" when hitting a tennis ball?​
    10·1 answer
  • Assuming the same current is running through two separate coils, why is it easier to thrust a magnet into a wire coil with one l
    6·2 answers
  • I NEED HELP ASAP!!!!!!!!!!!!!!!!
    12·2 answers
  • An external force of 5N is applied to a go-kart that is opposite it’s direction of travel for 5 seconds. What is the resulting m
    14·1 answer
  • How does object float
    8·2 answers
  • How long does it take for a bee traveling 11.34 m/s to fly 120 m?
    13·1 answer
  • Question 1
    14·1 answer
  • How to use heliocentric in your own sentence?
    14·1 answer
  • 11 points!!! <br>what happened when glucose reacts with air? ​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!