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
AveGali [126]
3 years ago
12

Say you want to make a sling by swinging a mass M of 1.9 kg in a horizontal circle of radius 0.042 m, using a string of length 0

.042 m. You wish the mass to have a kinetic energy of 15.0 Joules when released. How strong will the string need to be? (How much tension will there be in the string?)
Physics
1 answer:
padilas [110]3 years ago
3 0

Answer: T= 715 N

Explanation:

The only external force (neglecting gravity) acting on the swinging mass, is the centripetal force, which. in this case, is represented by the tension in the string, so we can say:

T = mv² / r

At the moment that the mass be released, it wil continue moving in a straight line at the same tangential speed that it had just an instant before, which is the same speed included in the centripetal force expression.

So the kinetic energy will be the following:

K = 1/2 m v² = 15. 0 J

Solving for v², and replacing in the expression for T:

T = 1.9 Kg (3.97)² m²/s² / 0.042 m = 715 N

You might be interested in
How does Kepler's first law refine the Copernican model?
AnnZ [28]
Copernicus's model states that the sun is in the center, and that the planets move around it in a circle. Kepler's first law of planetary motion says that they move around the sun in an ellipse.
8 0
3 years ago
A volleyball player bumps a ball across a net with the velocity and angle shown below. What is the maximum height of the ball?
Marrrta [24]

Answer:

D. 12.4 m

Explanation:

Given that,

The initial velocity of the ball, u = 18 m/s

The angle at which the ball is projected, θ = 60°

The maximum height of the ball is given by the formula

                             h = u² sin²θ/2g  m

Where,

                           g - acceleration due to gravity. (9.8 m/s)

Substituting the values in the above equation

                            h = 18² · sin²60 / 2 x 9.8

                               = 18² x 0.75 / 2 x 9.8

                               = 12.4 m

Hence, the maximum height of the ball attained, h = 12.4 m

6 0
3 years ago
3. How does Earth’s rotation affect our view of stars
Elis [28]
Since we ride along with the Earth while it's doing whatever it does,
the Earth's rotation causes our eyes to constantly point in a different
direction.

If we try to keep watching one star, we have to keep changing the
direction of our eyes to keep looking at the same star. 

We can't feel the Earth rotating, so our brains say that the star  ... and
the sun and the moon too ... is actually moving across the sky.
5 0
3 years ago
Read 2 more answers
Early humans used rocks as tools to make other things as well as to construct buildings. Why was it better for them to use rocks
babymother [125]
Wood isn't as tough as rock. Wood also breaks down in weather and cracks under pressure. Plus rocks were more accessible.
6 0
3 years ago
Read 2 more answers
Which of the following has least mass
makvit [3.9K]
Answer is 1 molecule of S
4 0
3 years ago
Other questions:
  • A horizontal spring has one end firmly attached to a wall and the other end attached to a mass. The mass can slide freely on a s
    15·1 answer
  • Determine whether each substance will sink or float in corn syrup, which has a density of 1.36 g/cm3. Write “sink” or “float” in
    11·2 answers
  • Which word in the sentence is a plural pronoun?
    11·2 answers
  • a beaker has mass of 125 g. what is the mass of liquid if the beaker plus liquid have a mass of 232 g?
    5·1 answer
  • A cannon is fired horizontally at 243 m/s off of a 62 meter tall, shear vertical cliff. How long will it take the
    10·1 answer
  • Technician A says that the tinnerman nuts are used to hold the brake drum on and should be reinstalled when the drum is replaced
    7·1 answer
  • A boy is exerting a force of 70 N at a 50-degree angle on a lawn mower. He is accelerating at 1.8 m/s2. Round the answers to the
    8·1 answer
  • What characterizes static stretching? A. having a partner hold limbs in a stretch position B. assuming and holding a stretch pos
    5·2 answers
  • This may seem a little personal, but how do you ask a girl out that doesn't seem to have intrest in you? I'll give brainliest to
    8·1 answer
  • An astronaut who is repairing the outside of her spaceship accidentally pushes away a 99.1 cm long steel rod, which flies off at
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!