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4 years ago

What kind of friction occurs when moving parts have ball bearings

Physics

2 answers:

Oksanka [162]4 years ago

7 0

Answer: Rolling friction

Explanation:

Rolling friction is said to act when an object rolls over a surface. Machines often have moving parts. These moving parts roll over each other as the machine works. Ball bearings are commonly used to reduce friction between the two surfaces in contact as the machine parts roll over each other. This is a typical example of rolling friction as applied to machine parts.

ASHA 777 [7]4 years ago

7 0

Answer:

Rolling friction.

Explanation:

Rolling friction is the force resisting the motion when a body ( such as a ball, tires, wheel) rolls on a surface. It is applicable for bodies whose point of contact keeps changing. It is the force that opposes the motion of a body which is rolling over the surface of another.

Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation of the wheel, roadbed, etc. is recovered when the pressure is removed.

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True or False. The pressure inside a piston is the same in all directions.

Dominik [7]

Answer:

True

Explanation:

Pascal's law says that pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions.

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3 years ago

Lucifer is in a train traveling initially at 5.48 m/s west when she begins to accelerate west at the rate of 0.892 m/s/s for a t

monitta

Recall that

$v_f=v_i+at$

which follows from the definition for average acceleration. So Lucifer has a final velocity of

$5.48\dfrac{\rm m}{\rm s}+\left(0.892\dfrac{\rm m}{\mathrm s^2}\right)(6.90\,\mathrm s)\approx\boxed{11.6\dfrac{\rm m}{\rm s}}$

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3 years ago

A radioactive isotope has a half-life of days, and a sample of this isotope has a mass of mg initially. When will there be only

MaRussiya [10]

Answer:

11 days.

Explanation:

According to the statement, the radioactive isotope has a half-life greater than 1 day and lesser than 7 days. Let assume that the radioactive isotope has a half-life of 4 days and the initial mass is 50 mg. The time constant is:

$\tau = \frac{4\,days}{\ln 2}$

$\tau = 5.771\,days$

The time when mass is reduced to 8 milligrams is:

$t=-(5.771\,days)\cdot \ln\frac{8\,mg}{50\,mg}$

$t \approx 10.576\,days$

It is approximately 11 days.

6 0

3 years ago

Using the formula at the beginning of this lesson, calculate the wavelength of a signal from KPhET 98.7. Remember that FM statio

pickupchik [31]

Answer:

3.04 m ???

Explanation:

8 0

3 years ago

Using the solar constant, estimate the rate at which the whole Earth receives energy from the Sun. (Hint: Think about the area o

harkovskaia [24]

Answer:

1.475×10²⁴ W

Explanation:

I = Solar constant of the sun = 1362 W/m² (measured using satellites with value 1.3608 ± 0.0005 kW/m² the error is due to fact that solar output is not always constant)

r = Radius of earth = 6371 km = 6371000 m (mean radius)

A = Area of earth = (4/3)×π×r³

=(4/3)×π×6371000³ = 1.083×10²¹ m²

P = I×A

⇒P = 1362×1.083×10²¹

⇒P = 1.475×10²⁴ W

∴ Rate at which the whole Earth receives energy from the Sun is 1.475×10²⁴ W

4 0

3 years ago