All categories

4 years ago

Which is usually greater for a pair of surfaces, the coefficient of static friction or the coefficient of sliding friction? why

Physics

1 answer:

lorasvet [3.4K]4 years ago

5 0

Explanation :

Static friction is the frictional force between two objects that are at rest. While sliding friction is the frictional force between two objects in contact and are sliding w.r.t each other.

Static friction is usually greater than sliding friction because in static friction the contact forces is more and the interlocking between objects is tight as compared to sliding friction.

You might be interested in

In one of the classic nuclear physics experiments at the beginning of the 20th century, an alpha particle was accelerated toward

BaLLatris [955]

Answer:

= 4.3 × 10 ⁻¹⁴ m

Explanation:

The alpha particle will be deflected when its kinetic energy is equal to the potential energy

Charge of the alpha particle q₁= 2 × 1.6 × 10⁻¹⁹ C = 3.2 × 10⁻¹⁹ C

Charge of the gold nucleus q₂= 79 × 1.6 × 10⁻¹⁹ = 1.264 × 10⁻¹⁷C

Kinetic energy of the alpha particle = 5.28 × 10⁶ × 1.602 × 10⁻¹⁹ J ( 1 eV)

= 8.459 × 10⁻¹³

k electrostatic force constant = 9 × 10⁹ N.m²/c²

Kinetic energy = potential energy = k q₁q₂ / r where r is the closest distance the alpha particle got to the gold nucleus

r = ( 9 × 10⁹ N.m²/c² × 3.2 × 10⁻¹⁹ C × 1.264 × 10⁻¹⁷C) / 8.459 × 10⁻¹³

= 4.3 × 10 ⁻¹⁴ m

3 0

4 years ago

An aerobatic airplane pilot experiences weightlessness as she passes over the top of a loop the loop maneuver. The acceleration

Natali5045456 [20]

The radius of the loop is 18.9 km

Explanation:

When the airplane is at the top of the loop, the pilot experiences two forces:

The force of gravity, acting downward, of magnitude $mg$
The normal reaction exerted by the seat on the pilot, also acting downward, N

Since the plane is moving in a circular motion, the net force on the pilot must be equal to the centripetal force, therefore we can write:

$mg+N = m\frac{v^2}{r}$

where

m is the mass of the pilot

$g=9.8 m/s^2$ is the acceleration of gravity

N is the normal reaction

v = 430 m/s is the speed of the plane

r is the radius of the loop

Here we are told that the pilot feel weightless at the top of the loop: this means that the normal reaction is zero,

N = 0

Therefore the equation becomes

$mg=\frac{mv^2}{r}$

And so we can find the radius of the loop:

$r=\frac{v^2}{g}=\frac{430^2}{9.8}=18.9 \cdot 10^3 m = 18.9 km$

Learn more about circular motion:

brainly.com/question/2562955

brainly.com/question/6372960

#LearnwithBrainly

8 0

3 years ago

You’ve just discovered that you are blood type O negative, highly valuable because it can be given to almost anyone in a life-th

Karolina [17]

Answer:

A) true

33) Osha data : true

34 ) False

Explanation:

A) Karl Landsteiner was the first to classify blood on the basis of modern theory .

33) OSHA ( Occupational Safety and Health Administration ) data relates to the safety measures that are taken by a unit or firm to avoid hazardous situation for their workforce.

34 ) There are as many as 150 points in an average finger prints that can be compared. Some country like England requires 16 point identification , some like France requires 17 points identification. So The statement is wrong.

6 0

4 years ago

1. A moving object with a mass of 8.8 kg has linear momentum of magnitude 13 kg mis. What is the kinetic energy of

Juliette [100K]

Answer: Option C) 9.63 joules

Explanation:

Mass of object = 8.8kg

Speed of object = ?

Kinetic energy = ?

Momentum of the object = 13 kgm/s

Recall that momentum is a product of mass M and speed V of a moving object.

Thus, Momentum = Mass x Speed

13 kgm/s = 8.8kg x V

V = (13kgm/s ➗ 8.8kg)

V = 1.48 m/s

Now, that the speed of the object is known, calculate its kinetic energy. And, its kinetic energy depends on its mass M and speed, V

Thus, Kinetic energy = 1/2 x mv^2

= 1/2 x 8.8kg x (1.48m/s)^2

= 0.5 x 8.8kg x (1.48m/s)^2

= 4.4 x (1.48m/s)^2

= 9.63 joules

Thus, the kinetic energy of the object is

9.63 joules

3 0

4 years ago

If a graduated cylinder has a current water level of 30 ml and you add an object which causes the water level to rise to 53 ml,

Katen [24]

Answer:

23L

Explanation:

Given that:

Initial volume of water = 30mL

Final volume of water after an object was placed on it = 53mL

The volume object added which resulted in a rise to 5mL will be :

Final Volume of object - Initial volume of object

53 mL - 30mL = 23mL

Hence, volume of object added is 23 mL

5 0

3 years ago