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Katena32 [7]
4 years ago
7

When walking barefoot, Kevin can walk across the grass easily, but when he crosses the paved street, the street is hot and burns

his feet. At the beach he walks quickly across the hot sand to the cool water. Why do some substances feel hot to his feet and others do not? Radiation is heat transfer through waves. Specific heat is the amount of energy required to raise the temperature of a substance 1 degree C.​
Physics
1 answer:
PSYCHO15rus [73]4 years ago
3 0
Because of the radiation
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A book weighing 1.2 kg stands on the table. We place our hand on the book with a force of 15.3 N. The reaction force of the tabl
babunello [35]

Answer:

27 N

Explanation:

It will be the force of the book  1.2 kg * 9.81 m/s^2   PLUS the force of your hand  15.3 N    ..... it will be in the OPPOSITE direction

1.2 * 9.81 + 15.3 = ~27.1 N

8 0
2 years ago
What provides evidence that has helped earth scientists determine the age of the earth more precisely?
Juli2301 [7.4K]

Answer:

the answer is radioactive dating

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3 years ago
A child picks a ball up from the ground, then places it on a table. The ball rolls on the
crimeas [40]

Answer:

A- The ball has both kinetic and potential energy,

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kinetic energy by virtue of its motion.

potential energy by virtue of its position. (It could roll off the edge of the tabel and convert gravity potential energy to kinetic energy)

6 0
3 years ago
A cat runs and jumps from one roof top to another which is 5 m away and 3 m below. Calculate the minimum horizontal speed with w
icang [17]
ThIs is the same type of problem
find out the time value
3 = 1/2*a*T^2
6/10 = t^2
t = 0.77 seconds
and the distance is given 5 m
thus speed ,= distance/time
speed = 5/0.77
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6 0
3 years ago
________ cable is NOT subject to electromagnetic interference or radio frequency interference. Polycarbonate Twisted-pair Coaxia
malfutka [58]

Answer:

The correct option is: d. Fiber-optic

Explanation:

A fiber-optic cables or an optical-fiber cable is a cable that is composed of a bundle of optical fibers. These cables are used for transmitting information or digital signals over long distances.

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