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3 years ago

If an object is not moving, does that mean there are no forces acting up on it? Why or why not?

Physics

1 answer:

larisa86 [58]3 years ago

7 0

Answer:

If an object is at rest, then there are no forces acting upon the object.

Explanation:

It would take an unbalanced force to keep an object in motion at a constant velocity. It is the natural tendency of all objects to eventually come to a rest position.

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The ideas that the universe began at a single point and has been expanding since its formation are the main premises of which of

Basile [38]

The big bang theory describes and claims that the universe has been created through cosmic expansion originating from a single point.

Where it was explained that the nature of now objects in space being in constant space was due to once a high density and high density point produce a scattering or explosion of the cosmic energy . Other theories have also supported this theory originally and first documented by Georges Henri Joseph Édouard Lemaître an astronomer and physicist.

6 0

3 years ago

A person who weighs 69kg rides with an acceleration of +1.45 m/s2. What is the force exerted by the legs on the person's upper b

trapecia [35]

Answer:

The force exerted by the legs on the person's upper body 32.106 N.

Given:

Mass = 69 kg

Acceleration = 1.45 $\frac{m}{s^{2} }$

To find:

Force exerted by legs on the person's upper body = ?

Formula used:

Force = mass × acceleration

Solution:

Mass of legs = $\frac{32}{100}$ mass of body

Mass of legs = 22.08 kg

According to Newton's second law of motion,

Force = mass × acceleration

Force = 22.08 × 1.45

Force = 32.106 N

The force exerted by the legs on the person's upper body 32.106 N.

4 0

4 years ago

Can Anyone Some one Help me with these three Questions PLEASE!!!!

pentagon [3]

1) is the first one : the populations become adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring

2) is the third one : they have identical physical characteristics

3) is the second one : the populations are isolated and thus do not interbreed .

hoped it helped !!!

4 0

3 years ago

A mass weighing 4 lb stretches a spring 4in. Suppose the mass is given an additional in displacement downwards and then released

anastassius [24]

Answer:

4√6 rad/s

Explanation:

Since the spring is initially stretched a length of x = 4 in when the 4 lb mass is placed on it, since it is in equilibrium, the spring force, F = kx equals the weight of the mass W = mg.

So, W = F

mg = kx where m = mass = 4lb, g = acceleration due to gravity = 32 ft/s², k = spring constant and x = equilibrium displacement of spring = 4 in = 4 in × 1ft /12 in = 1/3 ft

making k the spring constant subject of the formula, we have

k = mg/x

substituting the values of the variables into the equation, we have

k = mg/x

k = 4 lb × 32 ft/s² ÷ 1/3 ft

k = 32 × 4 × 3

k = 384 lbft²/s²

Now, assuming there is no friction and no external force, we have an undamped system.

So, the natural frequency for an undamped system, ω = √(k/m) where k = spring constant = 384 lbft²/s² and m = mass = 4 lb

So, substituting the values of the variables into the equation, we have

ω = √(k/m)

ω = √(384 lbft²/s² ÷ 4 lb)

ω = √96

ω = √(16 × 6)

ω = √16 × √6

ω = 4√6 rad/s

5 0

3 years ago

A 2000 kg streetcar parked in a lot has a larger momentum than a 1000 kg car going 25 meters per second on the highway.

Arturiano [62]

Answer:

Other than the fact that momentum is a "vector" quantity I wouldn't know.

If the car had a momentum opposite to the chosen positive direction then its total momentum would be negative.

7 0

3 years ago