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
pogonyaev
3 years ago
11

3. A cart at rest at the top of a roller coaster has 1000 J of

Physics
2 answers:
vovikov84 [41]3 years ago
5 0

Answer:

600J

Explanation:

Assuming no energy is lost and perfect transfers.

On the top of the first hill, E_{k}+E_{p}=1000 - however there is no Kinetic Energy so - E_k = 0

On the second hill, the total amount of energy is still the same (1000) - this time we have a smaller amount of potential energy. We can rearrange to get E_k=1000-400

wariber [46]3 years ago
4 0

Answer:

j

Explanation:

You might be interested in
A bicycle is traveling north at 5.0 m/s. The mass of the wheel, 2.0 kg, is uniformly distributed along the rim, which has a radi
andreev551 [17]

Answer:2

Explanation:

Given

Velocity of bicycle is 5 m/s towards north

radius of rim r=20 cm

mass of rim m=2 kg

Angular momentum \vec{L}=I\cdot \vec{\omega }

I=mr^2=2\times 0.2^2=0.08 kg-m^2

\omega =\frac{v}{r}=\frac{5}{0.2}=25 rad/s

L=0.08\times 25=2kg-m^2/s  

direction of Angular momentum will be towards west

7 0
3 years ago
An airplane flying at 119 m/s is accelerated uniformly at the rate of 0.5 m/s2 for 10
miss Akunina [59]

Answer:

124m/s

Explanation:

v=u+at

v=119+(0.5×10)

v=119+5

v=124m/s

4 0
3 years ago
Una mujer de masa m está parada en el borde de una mesa giratoria horizontal de momento de inercia I y radio R. La mesa al princ
Dovator [93]

r

- \frac{mR^2 }{I  } \ vAnswer:

a)      w = - \frac{m r }{I} v  ,  b)   W = - ½ m_woman R² (1 + m_woman R / I²) v²

Explanation:

a) To solve this exercise, let's use the conservation of angular momentum.

We define a system formed by the table and the woman, therefore the torques are internal and the moment is conserved

initial instant. Before starting to move the woman

         L₀ = 0

final instant. After starting to move

         L_f = I w + m v r

the moment is preserved

        L₀ = L_f

         0 = Iw + m v r

         w = - \frac{m r }{I} v                    (1)

the direction of the angular velocity is opposite to the direction of the linear velocity, that is, counterclockwise

b) for this part we use the relationship between work and kinetic energy

        W = ΔK

in this case the initial speed is zero and the final speed of the table, using the relationship between linear and angular variables

         v = w r

we substitute

          W = 0 - ½ I_total w²

          I_total = I + m_{woman} R²

          W = - ½ (I + m_woman R²)  ( \frac{m_{woman} R}{I} \ v) ²

          W = - ½ (m_woman² R² + m_woman³ R³ / I²) v²

          W = - ½ m_woman R² (1 + m_woman R / I²) v²

3 0
3 years ago
POSSIE
kotegsom [21]

Answer:

please find attached pdf

Explanation:

Download pdf
3 0
3 years ago
Please answer and thanks
allsm [11]
Erm wheres the question
7 0
3 years ago
Other questions:
  • PLEASE HELP!!!!!!!!! <br> The alignment causes a solar eclipse.
    8·2 answers
  • A car of mass 1,000 kilograms is moving initially at the speed of 22 meters/second. When the brakes are applied, it takes the ca
    10·3 answers
  • A wave has a period of 2 seconds and a wavelength of 4 meters. Calculate its frequency and speed.
    6·1 answer
  • If the net force on an object is to the left, what will the direction of the resulting acceleration
    14·1 answer
  • Who ever answers all these questions they"ll get brain list How exactly did life begin? ... Why do we dream? ... Is there a patt
    11·1 answer
  • Which road would exert the LEAST amount of friction on a car?
    14·1 answer
  • Why is tungsten used as a filament in a bulb?
    15·1 answer
  • Define the following terms: a) Heating effect of electric current b) Magnetic effect of electric current. c) Electric fuse. d) T
    14·1 answer
  • Help me plsssss<br> help me plsssss
    11·1 answer
  • A car’s tire rotates 5.25 times in 3 seconds. What is the tangential velocity of the tire?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!