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3 years ago

6

What are two factors affecting friction? How do they affect friction? ch

1 answer:

AlexFokin [52]3 years ago

5 0

The roughness of the surface, the mass of the object, and the area of contact.

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Suppose the Opera station broadcasts at 90.5MHz and the Rock and Roll station broadcasts at 107.1MHz. 1. Which station's signal

Allisa [31]

1). The "Opera" at 90.5 MHz has lower frequency,
so its wavelength is longer.

2). Whichever station is transmitting with higher power
has waves with higher energy.

Each photon of the transmission at 107.1 MHz carries more energy,
because the energy of a photon is proportional to its frequency.
But it's a mistake to think that the station at higher frequency has
waves with higher energy.

3 0

4 years ago

A reaction taking place in a container with a piston-cylinder assembly absorbs 4850. J of heat and has a change in the internal

Maslowich

Answer:

$V_f = 16.3 Ltr$

Explanation:

As per first law of thermodynamics we know that

heat absorbed = change in internal energy + Work done

so we have

$Heat = 4850 J$

$\Delta U = 1618.5 J$

so work done is given as

$4850 = 1618.5 + W$

$W = 3231.5 J$

now we know that at constant pressure the work done is given as

$W = P\Delta V$

$3231.5 = P(V_f - V_i)$

$3231.5 = 5.5 \times 1.01 \times 10^5(V_f - 10.5 \times 10^{-3})$

$V_f = 16.3 \times 10^{-3} m^3$

or we have

$V_f = 16.3 Ltr$

6 0

3 years ago

A cheetah bites into its prey. One tooth exerts a force of 320 N. The area of the point of the tooth is 0.5 cm². The pressure of

mote1985 [20]

Answer:

<h2>640N/cm^2</h2>

Answer D is correct

Explanation:

$pressure = \frac{force}{area} \\ = \frac{320}{0.5} \\ = 640$

hope this helps

brainliest appreciated

good luck! have a nice day!

6 0

3 years ago

Temperature is a measure of the average ____________ energy of an object's particles. light mechanical potential kinetic

Zielflug [23.3K]

Temperature is a measure of the average kinetic energy of the particles of a substance.
Hope this helps! :)

6 0

4 years ago

Read 2 more answers

Attached here is the question:

ICE Princess25 [194]

Answer:

t = 6 [s]

Explanation:

In order to solve this problem we must first use this equation of kinematics.

$v_{f}^{2}=v_{o}^{2} +2*a*x$

where:

Vf = final velocity = 0 (the car comes to rest)

Vo = initial velocity = 72 [km/h]

a = acceleration [m/s²]

x = distance = 60 [m]

First we must convert the velocity from kilometers per hour to meters per second.

$72 [\frac{km}{h}]*\frac{1000m}{1km} *\frac{1h}{3600s} =20 [m/s]$

$0=(20)^{2} -2*a*60\\400 = 120*a\\a=3.33[m/s^{2} ]$

Now using this other equation of kinematics.

$v_{f}=v_{o}-a*t$

0 = 20-3.33*t

t = 6[s]

5 0

3 years ago