Physics, 08.12.2020 20:00 jahnoibenjamin

An echocardiogram is a type of ultrasound test that measures sound waves as they bounce off the different parts of a person's heart. Which of these is the best model for how this test works? A. Counting the seconds between yelling and hearing an echo in a cave B. Counting the seconds between seeing lightning and hearing thunder C. Counting the minutes it takes a pot of water to come to a boil D. Counting the minutes it takes a ship's anchor to reach the seafloor

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Answer from: Quest

a electromagnetic waves

Answer from: Quest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol

b. a hockey puck sliding across the ice

c. a compressed spring

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice is the correct option.

Answer from: Quest

At maximum height, kinetic energy is converted in potential energy formula: at max height, ke = ½ * 0.27kg * (16m/s) ² = 34.56 j so the remaining pe = (41.70 – 34.56)= 7.14 j = 0.27 kg * 9.8m/s² * h = (9.8/7.14 * 0.27)so max height h = 5.08 or 5 m

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