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Lubov Fominskaja [6]
3 years ago
9

a jogger does 3.45 E 6 J of work and gives off 1.67 E 6 J of heat. what is the change in her internal energy? show your work​

Physics
1 answer:
madam [21]3 years ago
4 0

Answer:

well its burning its callories so thats it technically

Explanation:

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pshichka [43]
Newton's law of universal gravitation<span> states that a particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. hope this helps =)</span>
8 0
3 years ago
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Which of the following best describes why we say that light is an electromagnetic wave?
Kaylis [27]

Answer: The passage of a light wave can cause electrically charged particles to move up and down.

Explanation:

Electromagnetic waves are transversal waves, they are a combination of oscillating electric and magnetic fields, which propagate through space carrying energy from one place to another.  

This means the oscillation of the wave occurs in the transversal direction to its propagation. In addition, electromagnetic waves are spread thanks to the electromagnetic fields produced by moving electric charges.

8 0
4 years ago
A cave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. The lift i
Leya [2.2K]

Answer:

a) 323.4J

b) 0J

c) -323.4J

Explanation:

a) W=Fd

F=ma

solve for acc. using kinematics

v^2=vo^2+2a(x)

8.41=2a(12)

4.205=a(12)

0.35=a

F=(77)(0.35)

F=26.95N

W=26.95*12...... W=323.4J

b) No acceleration, thus no force, thus no work!

c) W=Fd

F=ma

find acc. using kinematics: v^2=vo^2+2a(x)

0=(2.9^2)+2a(12)

0=8.41+2a(12)

-8.41=2a(12)

-4.205=a(12)

-0.35=a

F=(77)(-0.35)

F=-26.95N

W=(-26.95)(12)

W=-323.4J

Yes, work can be negative!

5 0
3 years ago
Intensity: Radiation of a single frequency reaches the upper atmosphere of the earth with an intensity of 1350 W/m2. What is the
sesenic [268]

Answer:

The right answer is "1010 V/m".

Explanation:

The given values are:

Intensity,

I=1350 \ W/m^2

c = 3.00\times 108 \ m/s

\mu_0= 4\pi\times 10^{-7} \ T.m/A

Now,

The electric field's maximum value will be:

=  \sqrt{2\times u\times c\times I}

On substituting the values in the above formula, we get

=  \sqrt{2\times 4\times \pi\times 10^{-7}\times 3\times 10^8\times 1350}

=  \sqrt{32400\times 3.14\times 10^{-7}\times 10^8}

=  1010 \ V/m

3 0
3 years ago
How can alleles be different?
galina1969 [7]

Answer:

Explanation:

alleles are the different form of certain gene, and for each gene, you have two alleles, one from each parent. For example, you have two alleles for your eye color, let's say a brown allele and a blue allele (genotype Bb) but your physical appearance would be brown eyes (phentotype)

7 0
3 years ago
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