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2 years ago

Why do slippery fluids such as oil reduce sliding friction

1 answer:

6 0

fluid friction occurs when an object moves through a liquid or gas. the force needed to overcome fluid friction is usually less then that needed to overcome sliding friction. the fluid keeps the surface from making direct contact and thus reducing friction.

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If a wave has amplitude of 2 meters, a wavelength of 2 meters, and a frequency of 10 Hz, and a period of 1 second, then at what

Serhud [2]

Answer:

20 m/s

Explanation:

The speed of a wave is given by:

$v=\lambda f$

where

$\lambda$ is the wavelength

f is the frequency

v is the speed

For the wave in this problem,

f = 10 Hz is the frequency

$\lambda=2 m$ is the wavelength

So the speed is

$v=(10 Hz)(2 m)=20 m/s$

6 0

2 years ago

Which electromagnetic wave has the shortest wavelength? (A. Radio waves b. X-rays c.infrared rays or d. Visible light)

RSB [31]

X-rays have the shortest wavelength of any waves on that particular list.
Gamma ray waves are shorter than X-rays, but they're not on that list.

4 0

2 years ago

Consider a rigid body that rotates but whose center of mass is at rest. True or false: the rotational kinetic energy of the enti

Anit [1.1K]

Answer:

True

Explanation:

Let us consider a rigid body which contains tiny particles of mass dm each. and the angular velocity ω for each of the particle is same and teh radius of rotation is r.

the linear velocity, v = r ω

The total kinetic energy is given by

$K=\int \frac{1}{2}dm v^{2}$

$K=\int \frac{1}{2}dm r^{2}\omega^{2}$

$K=\frac{1}{2}\times \omega^{2}\int dm r^{2}$

K = 1/2 Iω^2

where I is the moment of inertia.

6 0

2 years ago

Using a simple machine, the machine cannot increase the amount of _______ , but can increase the amount of ________ .

givi [52]

work but not energy

Explanation:

hdhhsnshshshgsnajsysvbskdk

4 0

3 years ago

Read 2 more answers

Estimate the weight of a 1000kg car that is accelerating at 3 m/s/s.

Gekata [30.6K]

Answer:

W = 9800 N

Explanation:

Given that,

Mass of a car, m = 1000 kg

Acceleration of the car, a = 3 m/s²

We need to find the weight of the car. Weight of an object is given by the product of mass and acceleration due to gravity on the Earth.

W = mg

Put all the values,

W = 1000 kg × 9.8 m/s²

= 9800 N

So, the weight of the car is 9800 N.

8 0

3 years ago