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aleksley [76]
4 years ago
8

Because light travels in a straight line and casts a shadow, Isaac Newton hypothesized that light is

Physics
2 answers:
slamgirl [31]4 years ago
6 0

B. a stream of particles.

hope this helps

erica [24]4 years ago
5 0
B. A stream of particles, or otherwise known as photons, small pieces of light. All of the rest of the options could never make a shadow. 
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Select the correct answer. Lisa’s doctor tells her that she needs to eat more foods that contain calcium to maintain her bone he
Harlamova29_29 [7]
The answer is B, if your body doesn’t consume enough vitamin D, it takes calcium from your bones. This is called losing bone mass. Losing bone mass makes the inside of your bones weaker and have a higher risk of fractures (especially children).
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4 years ago
3. A wooden block is at rest on a wooden inclined
Xelga [282]

As the angle the plane makes with the horizontal is increased, the magnitude of the force of static friction between the block and the plane (2) increases

<h3>Static frictional force</h3>

Since the static frictional force between the block and the plane is given by F = μN where

  • μ = coefficient of static friction and
  • N = normal force on plane = component of weight of block perpendicular to the plane = Wcosθ where
  • W = weight of block and
  • θ = angle of inclined plane

Now, F = μN

F = μWcosθ

Since μ and W are constant, we see that

F ∝ cosθ and cosθ ∝ θ

So, F ∝ θ

Since the static frictional force is directly proportional to the angle the plane makes with the horizontal, when the angle the plane makes with the horizontal is increased, the static friction between the block and the plane increases.

So, As the angle the plane makes with the horizontal is increased, the magnitude of the force of static friction between the block and the plane (2) increases

Learn more about static frictional force here:

brainly.com/question/25958331

5 0
3 years ago
What is an electromagnet? * 10 points A metal magnet that has electricity running through it. A metal magnet that creates an ele
loris [4]

Answer:

A magnetic field caused by electric current.

Explanation:

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil.

Reference.

Nave, Carl R. (2012). "Electromagnet". Hyperphysics. Dept. of Physics and Astronomy, Georgia State Univ. Archived from the original on September 22, 2014. Retrieved September 17, 2014.

5 0
3 years ago
Read 2 more answers
A 3,00 kg truck moving at +10 m/s hits a 1,000 kg parked car in which moves off at +15 m/s what is the velocity of the truck
umka21 [38]

Answer:

Explanation:

Momentum before collision = momentum after collision

If

m₁ = 300 kg

v₁= 10 m/s

m₂ =1000 kg

v₂ = 0 as the car was parked

momemum before collision =

m₁ v₁ + v₂ m₂= 3000kgm/sec

momentum after collision= m₁ v₃+ v₄m₂=

300v₃+15m/sx 1000kg

now from the law of conservation of momentum

momentum before collision= momentum after collision

3000kgm/s= 300v₃ +15000kgm/s

-15000+3000= 300v₃

-12000=300v₃

v₃= -40m/s

the velocity of truck after collision is 40m/s and the negative sign indicates that its a recoil velocity.

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3 years ago
The fragment of an asteroid or any interplanetary material is known as a
Elodia [21]
The fragment of an asteroid or any interplanetary material is known as A. METEROID
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