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kirill115 [55]
3 years ago
9

True or false ,if false write right answer

Physics
1 answer:
steposvetlana [31]3 years ago
5 0
False. If general, ramps increase distance, but decrease the amount of force needed to move an object the same vertical distance without the ramp.
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Which situation is contrary to Newton’s first law of motion?
Bond [772]

Answer:

An object at rest stays at rest as long as unbalanced forces act on it.

Explanation:

Inertia can be defined as the tendency of an object or a body to continue in its state of motion or remain at rest unless acted upon by an external force.

In physics, Sir Isaac Newton's First Law of Motion is known as Law of Inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.

The inertia of a physical object such as a truck is greatly dependent or influenced by its mass; the higher the quantity of matter in a truck, the greater will be its tendency to continuously remain at rest.

Hence, the situation which is contrary to Newton’s first law of motion is that, an object at rest stays at rest as long as unbalanced forces act on it.

According to Newton’s first law of motion, an object at rest stays at rest as long as unbalanced forces do not act on it.

4 0
3 years ago
A shot-putter projects the shot at 42.00˚ to the horizontal from a height of 2.100 m. It lands 17.00 m away horizontally. Next,
Tamiku [17]

Answer:

Explanation:

Let 100 m/s  be the velocity of projection.

So horizontal component

= 100 cos42

= 74.31 m /s

Vertical component = - 100 sin 42 . in upward direction

66.91 m/s

Net displacement = 2.1 downwards ( + ve )

Using s = ut + 1/2 gt²

2.1 = - 66.91 t  + .5 x 9.8 x t²

4.9 t² -  66.91 t - 2.1 = 0

t = 13.685 s

Horizontal distance covered

= 13.685 x 74.31

= 1016.93 m

If angle of projction is 40°

So horizontal component

= 100 cos40

= 76.60 m /s

Vertical component = - 100 sin 42 . in upward direction

64.27 m/s

Net displacement = 2.1 downwards ( + ve )

Using s = ut + 1/2 gt²

2.1 = -76.60 t  + .5 x 9.8 x t²

4.9 t² -  76.60 t - 2.1 = 0

t = 15.659  s

Horizontal distance covered

= 15.659 x 76.60

= 1199.49  m

So horizontal range is increased , if angle of projection is increased .

8 0
3 years ago
A scientist is testing the seismometer in his lab and has created an apparatus that mimics the motion of the earthquake felt in
otez555 [7]

Complete Question

The complete question is shown on the first uploaded image  

Answer:

a

 a_{max} = 0.00246 \  m/s^2

b

   k  =722.2 \ N/m

Explanation:

From the question we are told that

     The  amplitude is A  = 1.8 \ cm  =  0.018 \ m

     The period is T  = 17 \ s

    The test weight is  W =  13 \ N

Generally the radial acceleration is mathematically represented as

        a =  w^2 r

at maximum angular acceleration

       r =  A

So  

       a_{max} =  w^2 A

Now w is the angular velocity which is mathematically represented as

      w =  \frac{2 * \pi }{T}

Therefore

       a_{max} =  [\frac{2 *  \pi}{T} ]^2 * A

substituting values

       a_{max} =  [\frac{2 *  3.142}{17} ]^2 * 0.018

       a_{max} = 0.00246 \  m/s^2

Generally this test weight is mathematically represented as

     W =  k *  A

Where k is the spring constant

Therefore

        k  = \frac{W}{A}

substituting values        

      k  = \frac{13}{0.018}

     k  =722.2 \ N/m

7 0
3 years ago
What is the velocity of an upward moving 500kg elevator that has 4000 of energy
Mrrafil [7]

Answer:

4 m/s

Step-by-Step Explanation:

E = mgh and h = E/mg

So if you put your numbers in the formula : h = 4000J/500 * 10

you will get h = 4/5 meters

use this , If the elevator moves from top to the ground in a constasnt acceleration you will have all energy (4000 J) transformed into acceleration to speed up its motion.

(All potential energy will be turned into movement energy). As explained in this formula;

mgh = mv²/2 , solve out (v) from the equation

v = √2gh = √2·10·4/5 (digits are together- not related to the problem, just for clarification) = 4 m/s

Answer the velocity of the elevator is

4 m/s

6 0
2 years ago
¿Cuál es la constante de proporcionalidad entre Y y X2?
djyliett [7]
This isn’t anything related to physics dude
5 0
3 years ago
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