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gizmo_the_mogwai [7]
2 years ago
5

PlEASE HELP quick I am in The middle of a quiz.

Physics
1 answer:
Vlada [557]2 years ago
8 0

Answer:

The second option

Explanation:

  • Radiation can be shown through emission of waves (those wavey lines that are present)
  • Radiation emits heat so it would transfer heat to a cold or less hot surface (so it would start of hot then transfer thermal energy to a cold surface)
  • An example would be the sun's radiation hitting the earth
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I need help pleaseee
Ludmilka [50]

Answer:

8) 709.8875 J

9) The object is at 7.24375 m from the ground

10) Kinetic energy increases as the object falls.

Explanation:

We use the expression for the displacement h(t) as a function of time of an object experiencing free fall:

h(t) = hi - (g/2) t^2

hi being the initial position of the object (10m) above ground, g the acceleration of gravity (9.8 m/s^2), and t the time (in our case 0.75 seconds):

h(0.75) = 10 - 4/9 (0.75)^2 = 7.24375 m

This is the position of the 10 kg object after 0.75 seconds (answer for part 9)

Knowing this position we can calculate the potential energy of the object when it is at this height, using the formula:

U = m g h = 10kg * 9.8 (m/s^2) * 7.24375 m = 709.8875 J (answer for part 8)

Part 10)

the kinetic energy of the object increases as it gets closer to ground, since its velocity is increasing in magnitude because is being accelerated in its motion downwards.

3 0
3 years ago
Help ASAP!
Aneli [31]
Always true everthing has gravity
5 0
3 years ago
In volleyball, how is the server determined?
PtichkaEL [24]

the team rotates the serve

4 0
3 years ago
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An object moves 2.5 m. This is an example of a _______. Question 3 options: direction distance velocity speed
Hitman42 [59]
Distance, since distance represents how far something has travelled, which would be in our case 2.5m.
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3 years ago
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A person with mass 65 kg, standing still, throws an object at 4 m/s. If the
fenix001 [56]

Explanation:

Momentum before = momentum after

m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂

(65 kg) (0 m/s) + m (0 m/s) = (65 kg) (-3.5 m/s) + m (4 m/s)

m ≈ 57 kg

7 0
3 years ago
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