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
soldier1979 [14.2K]
3 years ago
13

A tennis ball launcher works by using a spring to

Physics
1 answer:
sladkih [1.3K]3 years ago
4 0

Answer:

3MN/m

Explanation:

Step one:

given data

Kinetic Energy KE=15,000J  

mass m= 0.5kg

compression x= 0.1m

Step two:

The expression for the energy stored in spring is

KE= 1/2ke^2\\\\15000=1/2 *k*0.1^2\\\\15000=1/2*k*0.01\\\\15000=0.005k\\\\

divide both sides by

0.005

k= 15000/0.005\\\\k=3000000\\\\k= 3MN/m

You might be interested in
A cosmic ray proton moving toward the Earth at 5.00 10 m/s 7 × experiences a magnetic force of 1.70 10 N −16 × . What is the str
EastWind [94]

Answer:

Magnetic field will be equal to B=3\times 10^{-5}T

Explanation:

We have given velocity of proton 5\times 10^7m/sec

Magnetic force experienced by proton F=1.7\times 10^{-16}N

Charge on proton q=1.6\times 10^{-19}C

Angle between field and velocity \Theta =45^{\circ}

Force in magnetic field is equal to F=qBVsin\Theta

So 1.7\times 10^{-16}=1.6\times 10^{-19}\times 5\times 10^7\times B\times sin45^{\circ}

B=3\times 10^{-5}T

So magnetic field will be equal to B=3\times 10^{-5}T

7 0
3 years ago
Suppose C⃗ =A⃗ +B⃗ where vector A⃗ has components Ax = 5, Ay = 2 and vector B⃗ has components Bx = -3, By = -5. What is the dire
Leto [7]
First, find the components of vector C (I don't know how you added the vector arrow but that's pretty cool).

Ax + Bx = Cx, Ay + By = Cy
5 + -3 = 2, 2 + -5 = -3

Vector C can be represented as 2x, -3y.

Next, using a trigonometric function tangent you may find the angle from the origin

\theta = arctan(-3/2)

\theta = -56.31° = -0.983rad
7 0
3 years ago
Read 2 more answers
A roller-coaster car has a mass of 1240 kg when fully loaded with passengers. As the car passes over the top of a circular hill
LiRa [457]

Answer:

a)      N = 7.90 10³ N,  b) N = -1.04 10⁴ N

Explanation:

a) For this exercise we can use Newton's second law

             N -W = m (-a)

The relationship is centripetal, the negative sign of the acceleration is because it points towards the center of the circle

              a = v² / r

we substitute

             N = mg -m v² /r  

             N = m (g - v² /r)

let's calculate

v = 8.7 m / s

             N = 1240 (9.81 - 8.7²/22)

             N = 7.90 10³ N

b) v = 20 m / s

             N = 1240 (9.81 - 20²/22)

             N = -1.04 10⁴ N

8 0
3 years ago
The temperature of a system rises by 45 °C during a heating process. Express this rise in temperature in Kelvin and Fahrenheit.
djverab [1.8K]

Answer:

318K

113°F

Explanation:

45°C = 45 + 273K = 318K

45°C = (45 × 9/5) + 32 = 81 + 32 = 113°F

5 0
3 years ago
Simone created a chart to summarize the energy transformations that take place when energy from the wind is used to generate ele
melomori [17]

Answer:

d) kinetic energy transformed to mechanical energy

Explanation:

Wind energy comes from its movement, so kinetic energy

         Em = K = ½ m v²2

This energy spins the mill aspadle that this movement of the rotor within a magnetic field creates electricity in accordance with Faraday's law.

Consequently, from the above we should make a graph of the wind speed (kinetic energy) according to the electricity produced

The correct answer is d

4 0
3 years ago
Read 2 more answers
Other questions:
  • Gamma rays are used to _____.
    15·2 answers
  • Imagine that you were given a ship equipped with a device that could measure how deep the water is. You are asked to use this sh
    14·1 answer
  • Which best explains the importance of the internal combustion engine to the transportation industry?
    10·2 answers
  • An object moves in a straight path. Its position x as a function of time t is presented by the equation x(t) = at – bt2+c, where
    14·1 answer
  • Protons are found only in the atomic nucleus.<br> TRUE<br> FALSE
    9·2 answers
  • A 5.0-kg box is pulled by a horizontal force F applied to the top of the box. When the box meets a low doorstep, it begins to ro
    5·1 answer
  • B) A body of mass 10kg initially at rest is subjected to the force of 40N. What is kinetic energy acquired by the body at the en
    14·1 answer
  • Техническое задание
    14·1 answer
  • Use the drop-down menus to complete the statements. v ion is formed. OS When electrons are lost, a ____ When electrons are gaine
    9·2 answers
  • The smallest division value of electronic balance​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!