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STatiana [176]
3 years ago
12

No force is necessary to

Physics
1 answer:
igor_vitrenko [27]3 years ago
4 0
No force is necessary to keep a moving object moving (in a straight line at a constant speed).
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If a blue whale weighs 200 tons what would it be on the moon?
sasho [114]

Answer:

if no mistaken then it is 300kN

Explanation:

Using SI units (the default if a system is not specified) 200T = 200000kg as the mass of the whale, it would weigh 1960kN in 1g Earth gravity.

On the Moon, the acceleration is 0.166g, to it would weigh about 330kN.

7 0
2 years ago
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Sound waves are all
elixir [45]

Answer:

transverse waves

Explanation:

sound waves are all transverse waves

8 0
3 years ago
Describe the rise and fall of a thrown basketball by using the concepts o kinetic energy and potential energy
denpristay [2]

Explanation:

The kinetic energy is due to the motion of the object.

The potential energy is due to the position of the object.

When a basketball is thrown upward then the kinetic energy decreases and the potential energy will be maximum when it will reach its maximum height.

When it starts falling then potential energy starts decreases due to the decrease in the height and the kinetic energy starts increases.

6 0
3 years ago
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How much force would be needed to
Galina-37 [17]

There would be two forces acting on the box parallel to the floor, with a net force of

∑ <em>F</em> = <em>p</em> - <em>f</em> = <em>m a</em>

where <em>p</em> = magnitude of the push, <em>f</em> = mag. of friction, <em>m</em> = mass of the box, and <em>a</em> = acceleration. To find <em>p</em>, we first need <em>f</em> .

There are also only two forces acting on the box perpendicular to the floor, with net force

∑ <em>F</em> = <em>n</em> - <em>w</em> = 0

where <em>n</em> = mag. of normal force of the floor on the box and <em>w</em> = weight of the box. The net force is 0 because the box is only accelerating parallel to the floor.

<em />

<em>w</em> = <em>m g</em>, where <em>g</em> = 9.8 m/s² is the mag. of the acceleration due to gravity, so we can solve for <em>n</em> :

<em>n</em> = <em>w</em> = <em>m g</em>

<em>n</em> = (22 kg) (9.8 m/s²)

<em>n</em> = 215.6 N

The kinetic friction is proportional to the normal force by a factor of the given coefficient of friction, <em>µ</em> = 0.17, such that

<em>f</em> = <em>µ</em> <em>n</em>

<em>f</em> = 0.17 (215.6 N)

<em>f</em> = 36.652 N

Now solve for the required pushing force:

<em>p</em> - 36.652 N = (22 kg) (1.9 m/s²)

<em>p</em> ≈ 78 N

4 0
3 years ago
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What is the action force and the reaction force you sit down on a chair
Archy [21]
Action force is your weight pushing down on the chair. The reaction force is the force exerted by the chair that pushes up on your body and is equal to your weight. objects have inertia.
7 0
2 years ago
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