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
lora16 [44]
3 years ago
7

A boy flies a kite with the string at a 30 degree angle to the horizontal. The tension in the string is 4.5N .

Physics
1 answer:
guapka [62]3 years ago
8 0

From our physics class, we know that Work is a product of Force and Displacement. The force must be the force in the same direction with the displacement. So force and displacement must be parallel.

 

A. How much work in J does the string do on the boy if the boy stands still?

Since we know that: Work = Force * Displacement

and in this case displacement is equal to zero, therefore Work must also be equal to zero.

Work = 0

 

B. How much work does the string do on the boy if the boy walks a horizontal distance of 11m away from the kite?

Now are given a displacement of 11 m which is a horizontal distance. Therefore we must first calculate the horizontal component of force:

Fx = 4.5 N * cos 30

Fx = 3.897 N

 

So work is:

Work = 3.897 N * 11 m

<span>Work = 42.87 J ~ 43 J</span>

You might be interested in
A 1500 kg car is parked at the top of a hill 5.2 m high. At the bottom of the hill, what is the kinetic energy, in Joules, of th
irga5000 [103]

Answer:

10.1

Explanation:

I think it's right?

4 0
3 years ago
Instructions:Select all the correct answers.
melomori [17]
The answer would be B: The ground exerts an equal force on the golf ball.
6 0
3 years ago
Read 2 more answers
How do microwaves use the behavior and characteristics of the electromagnetic wave to function?
serg [7]

Answer:

Radiation moves out of the microwave into waves causing heat.

Explanation:

Inside your microwave oven, electrical energy is transformed into EM energy in the magnetron. When the microwave photons interact with food, food molecules are physically agitated, transforming the EM energy into kinetic energy, or energy of movement   .

Hope it helped!

6 0
3 years ago
A batter hits a 0.140-kg baseball that was approaching him at 19.5 m/s and, as a result, the ball leaves the bat at 44.8 m/s in
Arada [10]

Answer:

5295.3 N

Explanation:

According to law of momentum conservation, the change in momentum of the ball shall be from the momentum generated by the batter force

mv + P = mV

P = mV - mv = m(V - v)

Since the velocity of the ball before and after is in opposite direction, one of them is negative

P = 0.14(44.8 - (-19.5)) = 9 kg m/s

Hence the force exerted to generate such momentum within 1.7ms (0.0017s) is

F = P/t = 9/0.0017 = 5295.3 N

4 0
3 years ago
What is a good example of netwon 3rd law​
satela [25.4K]

A fish pushes water backwards in order to move forward is a good example of Newton's 3rd Law.

8 0
3 years ago
Other questions:
  • Salmon often jump waterfalls to reach their
    5·1 answer
  • A student measures the speed of a rolling ball three times. She adds the measurements and divides by 3. What quantity did the st
    9·2 answers
  • During aerobic activity, if your heart rate is lower than the lower limit, you are ___________________.
    11·1 answer
  • A nylon thread is subjected to a 8.5-N tension force. Knowing that E 5 3.3 GPa and that the length of the thread increases by 1.
    9·1 answer
  • A quantity must be divided by multiples of ten when converting from a larger unit to a smaller unit.
    14·1 answer
  • A laser beam of total power 1 mW and wavelength 365 nm is incident on a clean piece of metal in vacuum. The metal has a work fun
    15·1 answer
  • Got an F in Physical Science. HELP ME PLZZZ
    6·1 answer
  • Do magnets have to touch each other for a magnetic field to be present?
    10·1 answer
  • If the net force acting on an object is 0 N, you can be sure thr forces acting on the object are,
    14·1 answer
  • Caleb is filling up water balloons for the Physics Olympics balloon tosscompetition. Caleb sets a 0.50-kg spherical water balloo
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!