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
Monica [59]
4 years ago
8

A tennis player swings her 1000 g racket with a speed of 12 m/s. she hits a 60 g tennis ball that was approaching her at a speed

of 16 m/s. The ball rebounds at 42 m/s.
(a) How fast is her racket moving immediatley after the impact? You can ignore the interaction of the racket with her hand for the brief duration of the collision.

__________ m/s

(b) If the tennis ball and racket are in contatc for 10 ms, what is the average force that the racket exerts on the ball?

________ N

How does this compare to the gravitational force on the ball?

F avg / W ball=________
Physics
1 answer:
tensa zangetsu [6.8K]4 years ago
6 0

Answer:

should be the answer B

Explanation:

You might be interested in
What is dimension of volume flow rate.?
ella [17]
<span> is the volume of fluid which passes per unit time; usually represented by the symbol Q (sometimes V̇).</span>
6 0
3 years ago
The era of planet formation ended when the remaining hydrogen and helium gas of the solar nebula was swept into interstellar spa
artcher [175]

Answer:

The era of planet formation ended when the remaining hydrogen and helium gas of the solar nebula was swept into interstellar space by the solar winds.

Explanation:          

The Solar System is formed from a molecular cloud (compound by gas and dust). If there is a near perturbation to the cloud, maybe due to a supernova explosion, the molecular cloud will collapse under its own gravity. Then, in some point it starts to rotate and will accrete all the material in a disk around the protostar¹.

Inside the disk, dust particles start to collide and accrete until they form planetesimals². As a consequence of the gravitational force of the star, rocky and metallic particles will be more attracted to the inner part of the Solar System (close to the Sun) since they have more mass than gas.

Then, when the star has the necessary pressure and temperature to initiate nuclear reactions in its core, it will be able to emit huge amounts of energy, better known as solar winds. These winds will expel gas (hydrogen and helium) from the Solar System more easily than the rocky and metallic  particles.

Notice that when such event occurs, rocky and gaseous planets were already formed.

       

Key terms:

¹Protostar: A young star.

²Planetesimals: Object formed by many fragments due to the gravitational attraction between them.

5 0
3 years ago
A wind turbine works by slowing the air that passes its blades and converting much of the extracted kinetic energy to electric e
ddd [48]

Answer:

2649600 Joules

Explanation:

Efficiency = 40%

m = Mass of air = 92000 kg

v = Velocity of wind = 12 m/s

Kinetic energy is given by

K=\frac{1}{2}mv^2\\\Rightarrow K=\frac{1}{2}\times 92000\times 12^2\\\Rightarrow K=6624000\ J

The kinetic energy of the wind is 6624000 Joules

The wind turbine extracts 40% of the kinetic energy of the wind

E=0.4\times K\\\Rightarrow E=0.4\times 6624000\\\Rightarrow E=2649600\ J

The energy extracted by the turbine every second is 2649600 Joules

8 0
3 years ago
An environmental scientist gives a demonstration on composting. Roger is in the audience. He wonders how composting discarded fo
Wittaler [7]

Answer:

A

Explanation:

I just did the test

4 0
3 years ago
8 a Name the bones that articulate (join together) in the knee joint
Marianna [84]

Answer:

The Femur and the Tibia

8 0
3 years ago
Other questions:
  • Observations show that the dragonflies complete one revolution every 0.017 s during this "spin dry" maneuver. What is their angu
    11·1 answer
  • A feather of mass 0.001 kg falls from a height of 2 m under realistic conditions it experiences air resistance based on what you
    9·2 answers
  • Make the following conversion
    8·1 answer
  • How is a crime scene secured ?
    10·2 answers
  • You are designing a hydraulic lift for a machine shop. The average mass of a car it needs to lift is about 1500 kg. You wish to
    6·1 answer
  • A 50.0-g Super Ball traveling at 29.5 m/s bounces off a brick wall and rebounds at 16.0 m/s. A high-speed camera records this ev
    15·1 answer
  • Let DrippyJazzz124 answer the QUESTION
    7·1 answer
  • A ball is still live when
    11·1 answer
  • The
    10·1 answer
  • If the range of a projectile is and 256√3 m in the maximum height reached is 64 m. calculate the angle of projection​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!