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3 years ago

An infrared (IR) and ultraviolet (UV) wave propagating through a vacuum must have the same____

Physics

1 answer:

Zinaida [17]3 years ago

3 0

Answer:

D. Wavelength

Explanation:

An infrared (IR) and ultraviolet (UV) wave propagating through a vacuum must have the same wavelength.

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A 30 kg box sits on the floor it requires 275N of force to get it moving once it is moving it only takes 225N of force.what are

gavmur [86]

1) The coefficient of static friction is 0.935

2) The coefficient of kinetic friction is 0.765

Explanation:

When a force is applied on a box sitting on the floor, the force that must be applied in order to make the box moving is equal to the maximum force of static friction between the floor and the box, which is:

$F = \mu_s mg$

where

$\mu_s$ is the coefficient of static friction

m is the mass of the box

g is the acceleration of gravity

Here we have:

m = 30 kg

$g=9.8 m/s^2$

F = 275 N

Therefore, the coefficient of static friction is

$\mu_s = \frac{F}{mg}=\frac{275}{(30)(9.8)}=0.935$

Once the box is in motion, the force that must be applied in order to make the box moving at constant velocity is equal to the force of kinetic friction between the floor and the box, which is:

$F = \mu_k mg$

where

$\mu_k$ is the coefficient of kinetic friction

m is the mass of the box

g is the acceleration of gravity

Here we have:

m = 30 kg

$g=9.8 m/s^2$

F = 225 N

Therefore, the coefficient of kinetic friction is

$\mu_k = \frac{F}{mg}=\frac{225}{(30)(9.8)}=0.765$

Learn more about friction:

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#LearnwithBrainly

8 0

3 years ago

Looking at the examples below and select the change in matter that is an example of a physical change A Ice Melting B leaves cha

Gnesinka [82]

Answer:

- As an ice cube melts, its shape changes as it acquires the ability to flow. ... A physical change is a change to a sample of matter in which some ... The salt may be regained by boiling off the water, leaving the salt ... The resulting mixture is a solution with a pale green color. ... Answer b: chemical change.

Explanation:

8 0

3 years ago

A large truck traveling at +15 m/s collides head-on with a small car traveling at -15 m/s, which of the following statements is

qaws [65]

A because it is +15?

3 0

3 years ago

I don’t know what to do

zavuch27 [327]

Answer:

So increasing the voltage increases the charge in direct proportion to the voltage. If the voltage exceeds the capacitors rated voltage, the capacitor may fail due to breakdown of the dielectric between the two plates that make up the capacitor.

Explanation:

A option.

7 0

3 years ago

How long does a car (1000 kg) have a speed of 30 m/s from a rest if the engine power is 10kw

Lemur [1.5K]

Answer: 90.1 s

Explanation:

Use equation for power:

P=F*V

Use eqation for force:

F=ma

F---force

V---velocity

Vr=om/s

V=30m/s

m=1000kg

P=10000W

---------------------------

P=FV

F=P/V

F=10000W/30m/s

F=333.33N

Use equation for force to find accelartaion.

F=ma

a=F/m

a=333.33N/1000kg

a=0.333 m/s²

Use equation for accelaration to find out time:

a=(V-Vs)/t

t=(V-Vs)/a

t=(30m/s)/(0.333m/s²)

t=90.09 s≈90.1 s

------------------------

5 0

3 years ago