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Solnce55 [7]
3 years ago
10

Rex makes himself a bowl of cereal. He puts 28 g of cereal in a bowl and then adds 245 g of milk. Before eating the cereal, he r

emembers that he has not yet finished his homework, and he runs off to his room to complete his work.
Fifteen minutes later, Rex comes back to the kitchen to eat his cereal. He notices that the milk has soaked into the cereal grains and made them larger. Which of the following is true about Rex's cereal-milk mixture?
Physics
1 answer:
Galina-37 [17]3 years ago
5 0

Answer:

A.)

Explanation:

Because you didn't add anything or take anything away.

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Determine the total amount of heat, in joules, required to completely vaporize a 50.0-gram sample of h2o(?) at its boiling point
Tanzania [10]
In order to calculate the amount of energy required, we must first check the latent heat of vaporization of water from literature. The latent heat of vaporization of any substance is the amount of energy required per unit mass to convert that substance from a solid to a liquid. For water this is 2,260 J/g. We now use the formula:
Energy = mass * latent heat
Q = 50 * 2,260
Q = 113,000 J

113,000 Joules of heat energy are required.
3 0
3 years ago
How do we find a distance graph in pysics​
VARVARA [1.3K]

Answer:

Distance-time graphs. If an object moves along a straight line, the distance travelled can be represented by a distance-time graph.

Explanation:

4 0
3 years ago
Read 2 more answers
A(n) 6.6 kg bowling ball is rolling towards the bowling pins. If its momentum is 15.9 kg*m/s, how fast is it traveling, in m/s?
Vedmedyk [2.9K]

Answer:

2.4m/s towards the bowling pins

Explanation:

Given parameters:

Mass of the ball  = 6.6kg

Momentum of the ball  = 15.9kgm/s

Unknown:

Speed of the ball  = ?

Solution:

The momentum is the amount of motion a body posses;

      Momentum = mas x velocity

Insert the parameters and solve;

      15.9  = 6.6 x velocity

        velocity  = 2.4m/s towards the bowling pins

3 0
3 years ago
A copper transmission cable 140 {\rm km} long and 12.5 {\rm cm} in diameter carries a current of 115 {\rm A}.
SpyIntel [72]

Answer:

1. V=22.0407\ V

2. Q=9126837\ J

Explanation:

Given:

length of copper cable, l=140\ km=1.4\times 10^5\ m

diameter of copper cable, d=12.5\ cm=0.125\ m

current through the copper wire, i=115\ A

We have the resistivity of copper, \rho=1.68\times10^{-8}\ \Omega.m

<u>We know that the resistance of a wire is given as:</u>

R=\rho.\frac{l}{a}

where:

a= cross sectional area of the wire

R=1.68\times 10^{-8}\times\frac{140000}{\pi.\frac{0.125^2}{4} }

R=0.1917\ \Omega

1.

<u>Now from the  Ohm's law:</u>

V=R.i

V=0.1917\times 115

V=22.0407\ V

2.

<u>From the Joules law the thermal energy generated as an effect of electrical energy is mathematically given as:</u>

<u />Q=i^2.R.t

where:

t= time duration for which the current flows

Q=115^2\times 0.1917\times 3600 (∵ we have 3600 seconds in 1 hour)

Q=9126837\ J

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3 years ago
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