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3 years ago

Which of the following is an example of static friction?

Physics

2 answers:

boyakko [2]3 years ago

6 0

Answer: C) Rubbing sticks together to create a fire.

nadezda [96]3 years ago

6 0

Hiiiiii

so the answer is a

thats all you came for

bye

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All celestial objects we tracted to each other by gravity.Asteroids A and B are 5 meters (m) part. Asteroids C and D are also 5

Nadusha1986 [10]

A. Between asteroids C and D because gravitational attraction is greatest with increased mass.

6 0

2 years ago

Which of the following quantities represent mass?

lisabon 2012 [21]

Answer:

Explanation:

a ) 12.0 lbs - mass

b ) .34 g - mass

c ) 120 kg - mass

As lbs , g and kg are units of mass , these things represent mass . lbs is FPS unit of mass and kg is SI unit . g is CGS unit of force .

d ) 1600 kN It represents force because kN or kilonewton is unit of force .

e ) it represents , length or distance because m or metre is unit of length .

f ) 411 cm It represents length or distance because cm is smaller unit of length

g ) 899 MN or million newton . Like d ) It also represents force . Million newton is higher unit of force .

6 0

2 years ago

Why is acceleration called vector quantity

MrRissso [65]

Because it has both magnitude and direction. When an object has positive acceleration, the acceleration occurs in the same direction as the movement of the object.

7 0

2 years ago

Select the things that would happen if the Moon were to vanish. (You may select more than one.)

Trava [24]

Answer:

The Answer Is A,C,D

Explanation:

The gravitational pull from the moon make bigger waves'

There would be no moon for eclipses

There would be more sun and no moon

3 0

2 years ago

The Doppler effect using ultrasonic waves of frequency 2.25 × 106 Hz is used to monitor the heartbeat of a fetus. A (maximum) be

miss Akunina [59]

Answer:

$v = 2.88 \times 10^7 m/s$

Explanation:

As per Doppler's effect we know that the frequency of the sound that is observed by the detector is the reflected sound

This reflected sound is given as

$f' = f (\frac{v - v_h}{v + v_h})$

$f' = 2.25\times 10^6(\frac{v - 1540}{v + 1540})$

so we know that the beat frequency is

$\Delta f = 240 Hz$

so we will have

$f - f' = \Delta f$

$2.25 \times 10^6 - 2.25\times 10^6(\frac{v - 1540}{v + 1540}) = 240$

$1 - (\frac{v - 1540}{v + 1540}) = 1.07 \times 10^{-4}$

so we have

$0.99989 = (\frac{v - 1540}{v + 1540})$

$1.99989\times 1540 = 1.067 \times 10^{-4} v$

$v = 2.88 \times 10^7 m/s$

4 0

2 years ago