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BartSMP [9]
4 years ago
7

In the 19th century James Joule, an English scientist, was the first to recognize the mechanical equivalent of heat as a specifi

c form of the general rule of the conversion of one form of energy to another.
Which fact can be explained with the help of this law?
A) burning a fuel releases heat
B) heating a block of ice causes it to melt
C) a piece of iron glows red hot in a furnace
D) wood rubbed against a rough surface feels hot
Physics
2 answers:
Dmitry [639]4 years ago
6 0

Answer:

D) wood rubbed against a rough surface feels hot

Explanation:

The heat is transferred from one form of energy (friction of the wood being rubbed against the surface) to another (heat energy).

Keith_Richards [23]4 years ago
6 0

Answer:

D

Explanation:

It is the only one that makes sense ( friction is being made )

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A stone is thrown with an initial speed of 11.5 m/s at an angle of 50.0 above the horizontal from the top of a 30.0-m-tall build
rewona [7]

Answer:

The magnitude of the horizontal displacement of the rock is 7.39 m/s.

Explanation:

Given that,

Initial speed = 11.5 m/s

Angle = 50.0

Height = 30.0 m

We need to calculate the horizontal displacement of the rock

Using formula of horizontal component

v_{x}=u\cos\theta

Put the value into the formula

v_{x}=11.5\times\cos50

v_{x}=7.39\ m/s

Hence, The magnitude of the horizontal displacement of the rock is 7.39 m/s.

8 0
3 years ago
What is the difference between 5 mL of water and 5.0 mL of water?
ad-work [718]
There is no difference. 5 is the same as 5.0
6 0
4 years ago
Sound cannot travel through___________.
lana [24]

d.) a and b only

This is because sound needs a medium to travel.  It can travel in a solid (the fastest) and air for example.  Sound waves cannot propagate through a vacuum and since space is a vacuum the answer is a and b only.

5 0
3 years ago
How are typhoons formed? <br>Need help! ​
Mila [183]

Answer:

typhoon forms when winds blow into areas of the ocean where the water is warm. These winds collect moisture and rise, while colder air moves in below. This creates pressure, which causes the winds to move very quickly. The winds rotate, or spin, around a center called an eye.

5 0
3 years ago
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An experiment in your science class lists the materials needed for the lab. It is your job, as a lab partner, to measure out 25
andreyandreev [35.5K]
 Overview: 
You would use a graduated cylinder to measure 25 ml of the liquid and use a scale to weigh the amount of Magnesium (it can be a balance but most labs now have small scales) and  you would carefully put small amounts of magnesium until it states 2.5 grams.

Procedure: 
Take the graduated cylinder and place it on the table. Carefully take the water and fill the graduated cylinder up to 25ml. If you took to much just simply pour some out and if you didnt take enough then put more. After you measured the water then you can pour the 25 ml of water into a beaker, but this is totally optional. 

For the magnesium first you put on the scale and set it to grams. Afterwards just take small pieces of the magnesium and place it on the scale until you reach 2.5 grams. Afterwards you can carefully place the magnesium in another beaker or something like that. 
5 0
3 years ago
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