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Andrews [41]
3 years ago
6

Before we understood that objects have a tendency to maintain their velocity in a straight line unless acted upon by a net force

, people thought that objects have a tendency to stop on their own. This happened because a specific force was not yet understood. What was that force?
Physics
1 answer:
Sveta_85 [38]3 years ago
7 0

Answer:Friction force

Explanation:

The frictional force is responsible for stopping the moving object.

The friction force is provided by nature in the form of air resistance, fluid resistance, Surface resistance.

For surface resistance, the friction force is of two types namely kinetic friction force and static friction force.

Static friction acts when the object is stationary and a force is applied to cause the motion while kinetic friction acts when the body starts moving.

kinetic friction is lesser is in magnitude as compared to static friction.

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A bug of mass 2.2 g is sitting at the edge of a cd of radius 3.0 cm. if the cd is spinning at 280 rpm, what is the angular momen
m_a_m_a [10]
M = 2.2 g = 2.2 x 10⁻³ kg, the mass of the bug.
r = 3.0 cm = 0.03 m, the radial distance from the center.

The angular speed is
ω = 280 rpm
    = (280 rev/min)*(2π rad/rev)*(1/60 min/s)
    = 29.3215 rad/s

The moment of inertia of the bug is
I = mr²
  = (2.2 x 10⁻³ kg)*(0.03 m)²
  = 1.98 x 10⁻⁶ kg-m²

Calculate the angular momentum of the bug.
J = Iω
  = (1.98 x 10⁻⁶ kg-m²)*(29.3215 rad/s)
  = 5.806 x 10⁻⁵ (kg-m²)/s

Answer: 5.806 x 10⁻⁵ (kg-m²)/s

5 0
4 years ago
A cyclist is travelling at 4 metres per second for 100 metres,<br> how long does it take?
Slav-nsk [51]

Answer:

25 seconds!

Explanation:

I just had to find what number to multiply 4 to get 100 and it was 25

4x25=100

Or you could do the easier way by dividing 100 by 4 which has the same answer: 25

100÷4=25

7 0
4 years ago
The molecular mass of CO2.
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Answer:

the molrcular mass of carbon dioxide id 44.01amu

Explanation:

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4 0
3 years ago
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Which lab equipment is used as a cover to prevent heated materials from splattering out of the container and as a holding plate
faltersainse [42]

Watchglass is a lab equipment that is used as a cover to prevent heated materials from splattering out of the container and as a holding plate for hot or flammable materials

<u>Explanation:</u>

Watch glass is an equipment used as a cover to prevent heated materials from splattering out of the container and as a holding plate for hot or flammable materials. It is a kind of concave glass which is also used to evaporate a liquid and also provides good air circulation which is used during cooking. The name watchglass was derived as they are see through and so similar to pocket glasses.

3 0
3 years ago
In a crossing situation, which vessel is required to maintain its course and speed?
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Both in the domestic and international guidelines tell that when two power-driven vessels are crossing so as to contain risk of collision, the vessel which has the other on her starboard side (the give-way vessel) must keep out of the way.

If you are the give-way vessel, it is your responsibility to avoid a collision. Normally, this means you must change speed or direction to cross behind the other vessel which is the stand-on vessel.

At evening, when you perceive a red light crossing right-to-left in front of you, you need to change your course. But if you perceive a green light crossing from left-to-right, you are the stand-on vessel, and should maintain course and speed.

The leading situations of collision risk are meeting head-on, overtaking, and crossing. When one of two vessels is to keep out of the way (give-way vessel), the other, the stand-on vessel, must uphold course and speed.

3 0
3 years ago
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