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
ankoles [38]
3 years ago
12

Reviewing old tests and quizzes will not help you determine what will be on a test because teachers don’t like to give students

hints about what could be on future tests. Please select the best answer from the choices provided T or F
Physics
2 answers:
kifflom [539]3 years ago
5 0

Answer:

False

Explanation:

riadik2000 [5.3K]3 years ago
4 0

Answer:

It is false

Explanation:

You might be interested in
A man is pushing a heavy crate up an inclined plane (ramp) into the back of semi trailer. What can the man do to make it easier
strojnjashka [21]
Make the ramp longer

6 0
3 years ago
Read 2 more answers
Sound
Ann [662]
Longitudinal, because the sound can only travel at one direction
3 0
2 years ago
Read 2 more answers
sunlight, wind, and running water are essentially "free." Yet renewable energy sources are a very small part of our energy consu
dimulka [17.4K]
The heat and energy of coal burning is more easier and more efficient to turn into electricity than any method using renewable resources. 
7 0
3 years ago
Read 2 more answers
A bug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min . What minimum coefficient frictio
Agata [3.3K]

Answer:

The minimum coefficient of friction is 0.27.

Explanation:

To solve this problem, start with identifying the forces at play here. First, the bug staying on the rotating turntable will be subject to the centripetal force constantly acting toward the center of the turntable (in absence of which the bug would leave the turntable in a straight line). Second, there is the force of friction due to which the bug can stick to the table. The friction force acts as an intermediary to enable the centripetal acceleration to happen.

Centripetal force is written as

F_c = m\frac{v^2}{r}

with v the linear velocity and r the radius of the turntable. We are not given v, but we can write it as

v = r\omega

with ω denoting the angular velocity, which we are given. With that, the above becomes:

F_c = m\frac{v^2}{r}=m\omega^2 r

Now, the friction force must be at least as much (in magnitude) as Fc. The coefficient (static) of friction μ must be large enough. How large?

F_r=\mu mg \geq m\omega^2 r = F_c\implies\\\mu \geq \frac{\omega^2 r}{g}

Let's plug in the numbers. The angular velocity should be in radians per second. We are given rev/min, which can be easily transformed by a factor 2pi/60:

\frac{1 rev}{1 min}\cdot\frac{\frac{2\pi rad}{rev}}{\frac{60s}{1 min}}=\frac{2\pi}{60}\frac{rad}{s}

and so 45 rev/min = 4.71 rad/s.

\mu \geq \frac{\omega^2 r}{g}=\frac{4.71^2\frac{1}{s^2}\cdot 0.12m}{9.8\frac{m}{s^2}}=0.27

A static coefficient of friction of at least be 0.27 must be present for the bug to continue enjoying the ride on the turntable.



3 0
2 years ago
With a 900 V source, voltage is divided across 3 series resistors of 300 V, 280 V, and:
telo118 [61]

Answer:

AAAAAAAAaaaaaaaaaaaaaaaaaaaaaaaaaaaa

6 0
2 years ago
Other questions:
  • A particle is to move in an xy plane, clockwise around the origin as seen from the positive side of the z axis. In unit-vector n
    11·1 answer
  • If a chemical change has taken place, which of these is most likely true?
    11·2 answers
  • In a nuclear power plant, the nuclear reaction is kept from going critical by keeping the rate of reaction safe. How do the cont
    5·2 answers
  • The density of a sample can be obtained by dividing its __________ by its _______________.
    12·1 answer
  • With which field of science is Albert Einstein associated? biology chemistry medecine physics
    8·2 answers
  • Can you get cornered in a round room?
    9·2 answers
  • A uniform electric field is pointing in x direction. The magnitude of the electric field is 10 N/C. The filed makes an angle of
    8·1 answer
  • Which of these is exhibiting kinetic energy? Which of these is exhibiting kinetic energy? the high-energy phosphate bonds of a m
    7·1 answer
  • A finite resource in the environment that keeps a population from steadily increasing is known as
    13·1 answer
  • A plane is heading south with a velocity of 150 kilometers/hour. It experiences a tailwind with a velocity of 20 kilometers/hour
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!