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
Semenov [28]
3 years ago
9

Sharpening your pencil makes work easier by:

Physics
1 answer:
Serhud [2]3 years ago
7 0
B. because it's kind of like a fulcrum. 
You might be interested in
what is the efficiency of a machine that can carry a load of 100 kg with an effort of 20N when its velicity ratio is 10​ ASAP
Salsk061 [2.6K]

Answer:

Efficiency of machine=4.9

Explanation:

We are given that

Mass of load=100 kg

Effort=20 N

Velocity ratio=10

We have to find the efficiency of machine.

Load=mg=100\times 9.8=980 N

Efficiency=\frac{Load}{effort}\times \frac{1}{velocity\;ratio}

Using the formula

Efficiency of machine=\frac{980}{20}\times \frac{1}{10}

Efficiency of machine=\frac{49}{10}

Efficiency of machine=4.9

7 0
4 years ago
Plz help
Nikolay [14]

The answer to this is C

7 0
4 years ago
A ball of radius r rolls on the inside of a track of radius R. If the ball starts from rest at the vertical edge of the track, f
meriva

Answer:

v=\sqrt{\dfrac{10g(R-r)}{7}}

Explanation:

Given that

Radius of track = R

Radius of ball = r

The ball can be treated as solid sphere, so

The moment of inertia of ball

I=\dfrac{2}{5}mr^2

When the ball reach at the lowest position then it will have both angular and linear speed.

Condition for  rolling without slipping       v= ωr

Form energy conservation

mgR=mgr+\dfrac{1}{2}mv^2+\dfrac{1}{2}I\omega^2

 v= ωr

I=\dfrac{2}{5}mr^2

mgR=mgr+\dfrac{1}{2}mv^2+\dfrac{1}{2}\times \dfrac{2}{5}mr^2\omega^2

mg(R-r)=\dfrac{1}{2}mv^2+\dfrac{1}{2}\times \dfrac{2}{5}mv^2

2mg(R-r)=mv^2+\dfrac{2}{5}mv^2

2g(R-r)=\dfrac{7}{5}v^2

v=\sqrt{\dfrac{10g(R-r)}{7}}

3 0
3 years ago
A 20 kg rover is located on Mars where the acceleration due to gravity is 3.7 m/s/s.
Arte-miy333 [17]

Answer:

74N

Explanation:

force = mass * acceleration

force =  20 * 3.7

force = 74N

4 0
3 years ago
Question 3 of 5 What happens to the particles in a substance as it melts? O A. The particles slow down and become fixed in place
Mars2501 [29]

Answer:

D. The particles move more quickly and begin to move from place to place.

Explanation:

4 0
3 years ago
Other questions:
  • What is the amount of "stuff in an object?
    11·2 answers
  • How do u convert 7.68 cal/sec to kcal/min
    13·2 answers
  • Which of these things poses the greatest hazard to communications satellites? a) photons from the Sun b) solar magnetic fields c
    12·2 answers
  • What is the mathematical formula for relating velocity, wavelength, and frequency?
    14·1 answer
  • An ideal gas is compressed in a well-insulated chamber using a well-insulated piston. This process is
    15·1 answer
  • One way to measure g on another planet or moon by remote sensing is to measure how long it takes an object to fall a given dista
    13·1 answer
  • Help me please .....
    6·1 answer
  • What is the Ultraviolet Catastrophe?​
    11·1 answer
  • PLEASE HELP !!!!!!! Fastttt !!!!!!!!! You are using a flashlight to find your phone in the dark but the light isn’t bright enoug
    7·1 answer
  • An object changing its speed from 10m/s to 3m/s is
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!