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pshichka [43]
3 years ago
15

Noaptea, aflându-te într-o odaie întunecată, observi pe peretele opus ferestrei deplasarea petelor luminoase provenite de la far

urile unui automobil în direcţia de la sud spre nord. În ce sens s-a deplasat automobilul?
Physics
1 answer:
alina1380 [7]3 years ago
5 0

Answer:

The car evidently moved in the South-North direction.

Mașina se deplasa în mod evident în direcția Sud-Nord.

Explanation:

English Translation

At night, in a dark room, you notice on the wall opposite the window the movement of light spots from the headlights of a car in a south-north direction. In what direction did the car move?

Solution

Light rays fall obliquely on walls but move in the same direction as the car's direction of travel. And from the question, it is stated that the light rays move in the south-north direction, hence, the car in question, moved in the South-North direction too.

In Romanian/In limba romana

Razele de lumină cad oblic pe pereți, dar se mișcă în aceeași direcție ca direcția de deplasare a mașinii. Și din întrebare, se precizează că razele de lumină se deplasează în direcția sud-nord, prin urmare, mașina în cauză se deplasa și în direcția Sud-Nord.

Hope this Helps!!!

Sper că acest lucru vă ajută!!!

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A worker exerts a pulling force on a box. The worker exerts this force by attaching a rope to the box and pulling on the rope so
shusha [124]

Answer:

<em>The magnitude of the pulling force is 20.66% of the gravitational force acting on the box</em>

Explanation:

<u>Accelerated Motion</u>

The net force exerted on a body is the (vector) sum of all forces applied to the body. The net force can be decomposed in its rectangular components and the dynamics of the body can be studied in each direction x,y separately.

Let's start off by calculating the acceleration the worker gives to the box when pulling it. The distance traveled by the box initially at rest in a time t at an acceleration a is given by

\displaystyle x=\frac{at^2}{2}

Solving for a

\displaystyle a=\frac{2x}{t^2}

\displaystyle a=\frac{2\cdot 10}{5.12^2}

a=0.763\ m/s^2

Now we analyze the geometric of the forces applied to the box. Please refer to the free body diagram provided below.

The forces in the y-axis must be in equilibrium since no movement takes place there, thus, being g the acceleration of gravity:

T_y+N=m.g

There Ty is the vertical component of the tension of the rope, N is the normal force, and m is the mass of the box

The decomposition of T gives us

T_y=Tsin\theta

T_x=Tcos\theta

Solving the above equation for N

Tsin\theta+N=m.g

N=m.g-Tsin\theta\text{..........[1]}

Now for the x-axis, there are two forces acting on the box, the x-component of the tension and the friction force Fr. Those forces are not equilibrated, thus acceleration is produced:

Tcos\theta-F_r=m.a

Recalling that

F_r=\mu N

Tcos\theta-\mu N=m.a

Replacing N from [1]

Tcos\theta-\mu (m.g-Tsin\theta)=m.a

Operating

Tcos\theta-\mu m.g+\mu Tsin\theta=m.a

Solving for T

T(cos\theta+\mu sin\theta)=m.a+\mu m.g

\displaystyle T=\frac{m.a+\mu m.g}{cos\theta+\mu sin\theta}

\displaystyle T=m\frac{a+\mu g}{cos\theta+\mu sin\theta}

We don't know the value of m, thus we'll plug in the rest of the data

\displaystyle T=m\frac{0.763+0.10\cdot 9.8}{cos36.8^o+0.10 sin36.8^o}

T=2.0252m

Dividing by the weight of the box m.g

T/(m.g)=2.0252/9.8=0.2066

Thus, the magnitude of the pulling force is 20.66% of the gravitational force acting on the box

7 0
3 years ago
The potential energy of an apple is 19.6 J, and it is 8 m above the ground. The mass of the apple is _____ kg
Crazy boy [7]
We know, U = mgh
Substitute the known values, 
19.6 = m * 9.8 * 8
m = 19.6 / 78.4
m = 1/4

In short, Your Answer would be 1/4 Kg

Hope this helps!
8 0
3 years ago
What real-world examples show no work being done? Can you think of examples other than resisting the force of gravity?
GalinKa [24]

-- pushing on a brick wall

-- standing on your little brother's back so that he can't get up

-- taking a nap while on the job

-- squeezing anything that doesn't yield to your squeeze, such as a glass bottle or your girl friend

-- watching TV

-- solving math problems in your head

-- making pictures out of clouds in the sky

8 0
3 years ago
Two books are located 1 m above the surface of the Earth. The first has a mass of 2 kg; the second has a mass of 1 kg. Which sta
stepladder [879]
B, the acceleration due to gravity is 9.8m/s/s regardless of mass

3 0
3 years ago
The SI unit for measuring pressure is known as ?<br> A. Bernoulli B. Archimedes C. Newton D. Pascal
8090 [49]
The answer is D. pascal
7 0
3 years ago
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