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
SSSSS [86.1K]
3 years ago
13

For the following questions, imagine the book drops in free fall and falls a distance d. For the system of the book and earth, t

he change in total energy of the system if the book falls a distance d _______.(A) is positive.(B) is negative.(C) is zero.(D) has a sign which cannot be determined.
Physics
1 answer:
alukav5142 [94]3 years ago
8 0

Answer:

C) is zero

Explanation:

According to the law of energy conservation, the total mechanical energy of the object is conserved. A book falling a distance d would have a change in potential energy, resulting in the same change in kinetic energy. But the total mechanical energy must be the same. So there's 0 change in total energy of the system.

You might be interested in
A roller coaster car of mass m = 300 kg is released from rest at the top of a 60 m high hill (position A), and rolls with a negl
Triss [41]

Answer:

The principle of conservation of energy and angular momentum

Explanation:

At point A, the car experienced maximum of potential energy

As it moves down the hill, the potential energy decreases while the kinetic energy increases.

The maximum kinetic energy of the car is needed for the attainment of enough centripetal force to help the car move through the loop without falling .

7 0
3 years ago
A disk shaped grindstone of mass 3.0 kg and radius 8 cm is spinning at 600 rpm. After the power is shut off the frictional torqu
seropon [69]

Answer:

\theta=50\ revolution

Explanation:

It is given that,

Mass of the grindstone, m = 3 kg

Radius of the grindstone, r = 8 cm = 0.08 m

Initial speed of the grindstone, \omega_i=600\ rpm=62.83\ rad/s

Finally it shuts off, \omega_f=0

Time taken, t = 10 s

Let \alpha is the angular acceleration of the grindstone. Using the formula of rotational kinematics as :

\alpha =\dfrac{\omega_f-\omega_i}{t}

\alpha =\dfrac{0-62.83}{10}

\alpha =-6.283\ rad/s^2

Let \theta is the number of revolutions of the grindstone after the power is shut off. Now using the third equation of rotational kinematics as :

\omega_f^2-\omega_i^2=2\alpha \theta

\theta=\dfrac{\omega_f^2-\omega_i^2}{2\alpha }

\theta=\dfrac{-62.83^2}{2\times -6.283}

\theta=314.15\ radian

\theta=49.99\ revolution

or

\theta=50\ revolution

So, the number of revolutions of the grindstone after the power is shut off is 50.

7 0
3 years ago
What is the audible range of human hearing
Phantasy [73]

Answer:

on an average, <em>2</em><em>0</em><em>H</em><em>z</em><em> </em><em>to</em><em> </em><em>2</em><em>0</em><em>k</em><em>H</em><em>z</em>

8 0
3 years ago
A satellite of mass 1000kg is in a circular orbit around a planet. The centripetal acceleration of the satellite in its orbit is
ludmilkaskok [199]

Answer: 5000N

Explanation:

The basic principle of a circular orbit is that Fg = m × ac, so as we have the mass and the centripetal acceleration (also called normal acceleration) we just have to operate. Fg = 1000kg × 5m/s² = 5000N

8 0
3 years ago
Where is most of Earth’s freshwater found?
STALIN [3.7K]
In lakes and streams
5 0
3 years ago
Other questions:
  • PLEASE ANSWER ASAP
    8·1 answer
  • A 25-kilogram mass travels east with a constant velocity of 40. meters per second. the momentum of this mass is
    5·2 answers
  • I'm very confused on this home work question How did magnetism 'drive' the theory of plate tectonics?
    10·1 answer
  • A football is kicked into the air from an initial height of 4 feet. The height, in feet, of the football above the ground is giv
    8·2 answers
  • What happens to a liquid when it loses energy
    14·1 answer
  • What is the function of a resistor in a circuit? How does it affect the amount of charge that flows? How does it affect the rate
    13·1 answer
  • PLS HELP
    6·1 answer
  • You are at a circus and you see a stunt man climb up 29.4 meters into a cannon. He gets fired horizontally out of the cannon wit
    14·1 answer
  • 3. What current is drawn by a 90 W light bulb on a 110 V household circuit?<br> Please answer!!!
    11·1 answer
  • Subtract the following and give the answer using significant figures 3.400-0.7591
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!