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3 years ago

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.

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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