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Ilya [14]
4 years ago
14

How do electromagnetic and mechanical waves compare?

Physics
2 answers:
larisa [96]4 years ago
4 0
Transmit energy
Doesn’t transmit matter
creativ13 [48]4 years ago
3 0

Answer:

Transmit energy

Explanation:

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A 25-kg child sits at the top of a 4-meter slide. After sliding down, the child is traveling at 5 m/s. How much PE does he start
Semmy [17]

Daniddmelo says it right there, don't know why he got reported.

The potential energy (PE) is mass x height x gravity. So it would be 25 kg x 4  m x 9.8 = 980 joules. The child starts out with 980 joules of potential energy. The kinetic energy (KE) is (1/2) x mass x velocity squared. KE = (1/2) x 25 kg x 5 m/s2 = 312.5 joules. So he ends with 312.5 joules of kinetic energy. The Energy lost to friction =  PE - KE. 980- 312.5 = 667.5 joules of energy lost to friction.

Please don't just copy and paste, and thank you Dan cause you practically did it I just... elaborated more? I dunno. 

4 0
3 years ago
A stack of books whose true weight is 165 N is placed on a scale in an elevator. The scale reads 165 N. Can you tell from this i
Inga [223]

Answer:

D) not enough information to decide

Explanation:

Data provided in the question

The True weight of book stacks = 165 N

Reading of the scale = 165 N

Constant velocity = 2 m/s upward or downward

Based on the above information

If you moved at a constant velocity the scale interprets the same because of the momentum you've got. The scale will change the number only when acceleration is present.

Therefore in the given situation, the option D is correct as it not have enough information for deciding it

8 0
3 years ago
What is required for a sound wave to be reflected?
iris [78.8K]
When sound travels on a certain wave pattern or medium once it hits the surface or surfaces of another wave or mdeium and then it bounces back that is a reflected sound wave.
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3 0
4 years ago
A 2300-kg car slows down at a rate of 3.0 m/s2 when approaching a stop sign. What is the magnitude of the net force causing it t
weeeeeb [17]

The magnitude of the net force causing the 2300kg car to slow down is 6900N

HOW TO CALCULATE FORCE:

  • The net force applied on a moving object can be calculated by multiplying the mass of the object by its acceleration. That is;

  • Force (N) = mass (kg) × acceleration (m/s²)

  • According to this question, a 2300-kg car slows down at a rate of 3.0 m/s2 when approaching a stop sign. The net force causing the car to stop can be calculated as follows:

F = 2300kg × 3m/s²

F = 6900N

  • Therefore, the magnitude of the net force causing the 2300kg car to slow down is 6900N.

Learn more at: brainly.com/question/18109210?referrer=searchResults

4 0
3 years ago
Hello! Someone please help me with this.
alukav5142 [94]

Explanation:

VT= 10 v

IT = V/R = 10/5= 2 A

RT= 5 ohm

PT = 20w

{i}^{2}  \times r =  {2}^{2}  \times 5 = 20watts

7 0
3 years ago
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