Which explains why conduction is unlikely when ice is placed on a freezer shelf? There is no direct contact. The ice is too cold. The shelf acts as an insulator. The ice and shelf are the same temperature.

Answers

Answer 1

Answer:

Answer: The ice and shel are at the same temperature.

Explanation: Conduction happens when you have two objects at different temperatures touching each other, in this case, the temperature flows from the hot object to the cold one, until the equilibrium is reached (this means that both objects are at the same temperature). So, in order to conduction to happen, we need a difference in temperature and direct contact. So there are two options of the given that can be the answer: "There is no direct contact" In the sentence says that "the ice is placed on the freezer shelf", so we have direct contact between both objects. "The ice and shelf are at the same temperature" Here both objects are inside of the freezer, so we can expect that both of them are at the same temperature, hence, there is no conduction.

Answer 2

Answer:

Answer:

the correct answer is d

Explanation:

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Two forces a 60 newton force east and an 80 newton force north

Answers

its resultant is 100 newton
√(60 square+80 square)

Oil flows upward in the wick of a lantern because of liquid property called

Answers

Capillarity "Capillarity causes the part of the surface of a liquid in contact with a solid, to be either elevated above (e.g. water), or depressed below (e.g. mercury), the rest of the surface. This trait is named for the behaviour of liquids in capillary tubes placed perpendicular to the surface. The forces operating within capillarity are cohesion, adhesion, and surface tension."

Define circular motion and give some examples.

Answers

"Circular motion" is motion in a circular path.

-- Any point on the tire of a bicycle or a car that is moving.

-- Any point on the hour, minute, or seconds-hand of an 'analog' clock.

-- The ball in the roulette wheel before it comes to a stop.

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Define Circular motion and its types

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${ \red{ \bold {\mathbb {\textit{Circular \: motion}}}}}$

MOTION OF THE BODY CIRCULAR PATH IS CALLED CIRCULAR MOTION

FEW IMP POINTS ABOUT IT :-

‌A tengential is always responsible for change in speed
‌If the Direction of acc and velocity is same then body's speed inc
‌If they r in oppsite direction then Body's speed dec .
‌If speed becomes constant then tangential acc become zero .
‌By the basis of tangial acc the circular motion is divided into two types uniform circular motion and non uniform circular motion

${ \blue {\bold{UNIFORM \: CIRCULAR}}} \n \green{ \bold{ MOTION}}$

‌when object in a circular path in a constant speed or constant circular speed is called uniform circular motion.
‌In case of uniform circular motion acc tendial will be zero
‌In case of uniform circular motion acc centripetal will be equal to net acc.

${ \green{ \bold{ NON UNIFORM}}} \n {\blue{ \bold{CIRCULAR \: MOTION}}}$

‌Centripetal acc is not equal net acc
‌Circular acc and tendial acc is not equal to zero .

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Earth revolving around the sun is an example of uniform circular motion
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Your boss asks you to compare two sound waves and determine which has a higher frequency. Wave A has a period o 4/100 second and Wave B has a period of 1/7 second. What would you tell your boss? A. Wave A has the higher frequency. It's frequency is 4 Hz
B. Wave A has the higher frequency. It's frequency is 25 Hz
C. Wave B has the higher frequency. It's frequency is 42 Hz
D. Wave B has the higher frequency. It's frequency is 7 Hz

Answers

Wave A has a higher frequency and that frequency is 25 Hz. This can be determined by taking the time span and dividing it by the number of waves/second. 100 divided by 4 is 25. 7 divided by 1 is 7. 25 Hz is higher than 7 Hz.

Answer:

Explanation:

A sound wave travels at 330 m/sec and has a wavelength of 2 meters. Calculate its frequency and period.

Answers

The frequency of the wave with a speed of 330 m/s and 2 meter wavelength is 165 Hz. The time period of the wave is then, 0.006 seconds.

What is frequency ?

Frequency of a wave is the number of wave cycles per second. Frequency of a wave is the inverse of its time period. It is inversely proportional to the wavelength and directly proportional to the speed.

Hence, ν = c/λ, where c is the speed.

The frequency of a sound wave is called its pitch.

Given that, c = 330 m/s

wavelength λ = 2 meters.

frequency = 330/2 = 165 s⁻¹ or 165 Hz.

The time period of a wave = 1/ frequency.

T = 1/165 = 0.006 s or 6 milliseconds.

Therefore, the frequency of the wave is 165 Hz and time period is 0.006 seconds.

Find more on sound waves:

brainly.com/question/11797560

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frequency=velocity/wavelength 330/2=165 hertz period=1/frequency=1/165 second

This image shows the direction of the flow of water through a constricted pipe. Which of the following happens as you move from position A to position B in the water pipe? A.The velocity of the water decreases.
B.The pressure of the water decreases.
C.The flow rate of the water decreases.
D.The density of the water increases.

Answers

The flow rate of the water decreases as the cross section is decreases. So, the correct option is C.

What is Bernoulli's equation?

Bernoulli’s principle states that the total mechanical energy of a moving fluid, which includes the gravitational potential energy of height, the energy associated with fluid pressure, and the kinetic energy of fluid motion, remains constant.

The formula for Bernoulli’s principle is given as follows:

$p+(1)/(2) pv^2+ pgh= constant$