Which of the following statements are true as a block of ice melts?The temperature of the ice/water system increases.
Heat energy enters the ice/water system.
The temperature of the ice/water system remains constant.Heat energy leaves the ice/water system.
The temperature of the ice/water system decreases.

Answers

Answer 1

Answer:
It takes heat energy to turn ice at 0°C into water at 0°C.

-- You start off with a block of ice.

-- Some heat energy hits the ice, the ice absorbs it, a little bit
of ice melts, and a puddle forms around it. Now you have an
ice/water system, all at 0°C.

-- If no more heat comes in from somewhere, then no more
ice can melt.

-- When some more heat energy comes in, some more ice
can melt, and become liquid at 0°C.

-- As heat comes in, more and more ice melts. The temperature
of the whole system remains constant. Any heat that comes in
is used to change the state of some ice from solid to liquid, with
no temperature change.

-- Finally, when all of the solid is gone, any more heat energy
begins to raise the temperature of the water.

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I live in the city. It's always warmer in the city, compared to other areas, even at night. Why is that? The rain shadow effect makes surrounding areas cool and moist and the city warm and dry. Buildings absorb and retain heat from the Sun, producing the urban heat island effect. Lake effect snow only affects areas outside of the city. The city receives lake effect snow.

Answers

I live in the city. It's always warmer in the city, compared to other areas, even at night. Why is that?

A.) The rain shadow effect makes surrounding areas cool and moist and the city warm and dry.

B.) Buildings absorb and retain heat from the Sun, producing the urban heat island effect.

C.) Lake effect snow only affects areas outside of the city.

D.) The city receives lake effect snow.

What is the temperature outside of a tree?

Answers

About 21c because it also depends on the weather outside

A basketball rolls of a 0.70 m high desk and strikes the floor 0.25 m away from the base of the desk? How fast was the ball rolling?

Answers

0.7/0.25=2.8m per second

If only a green light shown on a bunny that has black and white fur, what would the bunny look like?

Answers

The white fur reflects all colors, so would appear green.
The black fur reflects no colors, so would still appear black.

Answer:

Green and Black.

Explanation:

The white fur reflects all colors, so would appear green.

The black fur reflects no colors, so would still appear black.

The angle between the two vectors A=3i^+4j^+5k^ and B=3i^+4j^−5k^ will be: a. 90 degree b. 0 degree . 60 degree d. 30 degree

Answers

Answer:

Both vectors have the same X and Y components therefore

the angle between the two vectors is zero

(B) is correct

A boy cycles a distance of 960 m from home to school in 6 minutes. Calculate his average speed for the journey. Write your answer in m/s.

Answers

The average speed of the boy was 2,67m/s.

The average speed is found when we divide the distance traveled (Δx) by the travel time (Δt).

The formula is:

$\Huge\boldsymbol{V_(av)=(\Delta x)/(\Delta t)}$

Solving:

Data:

Distance: 960m

Time: 6min ⇒ (6 · 60) ⇒360s

We have:

$\LARGE\text{$V_(av)=(960)/(360)$}\n\n\n\n\Huge\boldsymbol{V_(av)\approx2,67m/s}$

The average speed of the boy for his journey is approximately2,67m/s.

_________

Know more:

About speed:

Hope this helps!

To calculate the average speed of the boy's journey, you can use the formula:

Average Speed (in m/s) = Distance (in meters) / Time (in seconds)

First, you need to convert the time from minutes to seconds because 1 minute equals 60 seconds:

6 minutes = 6 * 60 seconds = 360 seconds

Now, you can calculate the average speed:

Average Speed = 960 meters / 360 seconds = 2.67 m/s

So, the boy's average speed for the journey is approximately 2.67 meters per second.

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