C. element only one substance
Correct option B
Transverse waves are those waves whose particles vibrate perpendicular to the direction of wave.
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Radiation is a type of heat transfer wherein there is no need for medium or media through which the heat will flow. Consequently, the radiation waves are able to travel through vacuum. The best observation as evidence to conclude that heat is indeed transferred by radiation is the increase of temperature of the receiving body.
Answer: A
Explanation: How large a parachute is (in other words, the parachute's surface area) affects its air resistance, or drag force. ... In the case of these parachutes, the drag force is opposite to the force of gravity, so the drag force slows the parachutes down as they fall.
Explanation:
potential energy = mass × gravity force × height
=20 × 10 × 25
= 5000 joules
