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Naya [18.7K]
2 years ago
15

Cientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.

Physics
1 answer:
scZoUnD [109]2 years ago
3 0

Answer:

A few of the positive particles aimed at a gold foil seemed to bounce back.

Explanation:

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If an object is placed between a convex lens and its focal point, which type of image will be produced?
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<span>virtual, upright, and magnified</span>
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If you drop a silver dollar off a building and it hits the ground in 10 seconds, how fast was the coin going just before?
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V = u + at 
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The talk test can be used to measure the __________. A. knowledge of an activity B. intensity of an activity C. length of an act
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Explanation:

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You pull with a force of 295 N on a rope that is attached to a block of mass 22 kg, and the block slides across the floor at a c
Sergeeva-Olga [200]

Answer:

Fnet = 0

Explanation:

  • Since the block slides across the floor at constant speed, this means that it's not accelerated.
  • According Newton's 2nd Law, if the acceleration is zero, the net force on the sliding mass must be zero.
  • This means that there must be a friction force opposing to the horizontal component of the applied force, equal in magnitude to it:

       F_{appx} = F_{app} * cos \theta = 295 N * cos 35 = 242 N  (1)

  • In the vertical direction, the block is not accelerated either, so the sum of the normal force and the vertical component of the applied force, must be equal in magnitude to the force of gravity on the block:

      F_{appy} = F_{app} * cos \theta = 295 N * sin 35 = 169 N  (2)

⇒    169 N + Fn = Fg = 216 N  (3)

  • This means that there must be a normal force equal to the difference between Fappy and Fg, as follows:
  • Fn = 216 N - 169 N = 47  N (4)

6 0
2 years ago
You run<br> completely around a 400m track in<br> 80s. What was your average velocity?
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Answer:

V=?

S=400m

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V=S/t

V=400/80

V=5m/sec

6 0
3 years ago
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