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Gala2k [10]
3 years ago
6

A 37 N object is lifted to a height of 3 meters, What is the potential energy of this object?

Physics
2 answers:
prisoha [69]3 years ago
6 0

P.e = mgh

      37N ×  9.8ms⁻² ˣ 3m

   =    1087.8  .

Lostsunrise [7]3 years ago
5 0

Answer:

Potential energy of the object is 111 Joules.

Explanation:

It is given that,

Force of gravity acting on the object, F =W=mg= 37 N, W is its weight

It is lifted to a height of 3 meters, h = 3 m

We need to find the potential energy of this object. It is given by :

E=m\times g\times h

Since, mg = 37 N

So,

E=37\ N\times 3\ m

E = 111 Joules

So, the potential energy of this object is 111 Joules. Hence, this is the required solution.

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A hollow cubical box is 0.221 m on an edge. This box is floating in a lake with 1/4 of its height beneath the surface. The walls
yanalaym [24]

Answer:

3/4 filled with water

Explanation:

x = Fraction of box filled

g = Acceleration due to gravity = 9.81 m/s²

\rho_w = Density of water

V = Volume of water

Weight of empty box is equal to the weight of the water displaced

W_b=\frac{1}{4}V\times \rho_wg

As all the forces are conserved

W_b+xV\rho_wg=V\rho_wg\\\Rightarrow \frac{1}{4}V\times \rho_wg+xV\rho_wg=V\rho_wg\\\Rightarrow \frac{1}{4}+x=1\\\Rightarrow x=1-\frac{1}{4}\\\Rightarrow x=\frac{2}{3}

So, the box starts to sink when the box is 3/4 filled with water

8 0
3 years ago
What is instantaneous acceleration?
KengaRu [80]

Answer:

how fast the car goes

Explanation:

3 0
4 years ago
Read 2 more answers
Which of the following statements is falsifiable?
dimulka [17.4K]

We have that the <em>statements</em> found falsifiable is

Henry Ford invented the first automobile.

Option A

<h3>Henry Ford</h3><h3 />

Generally in as much Ford motor is a great vehicle company

He did not create the first automobile

Credit is give to Karl Benz for The first auto-mobile

Therefore

The statements found falsifiable is

Henry Ford invented the first automobile.

Option A

For more information on Benz visit

brainly.com/question/19424882

7 0
3 years ago
A police car with its 300-Hz siren is moving toward a warehouse at 30 m/s, intending to crash through the door. The sound bounce
Lady bird [3.3K]

Answer: The frequency heard will be f = 275.675Hz

Explanation: When an object emitting sound is moving, it occurs a phenomenon called Doppler shift or Doppler effect. What happens is that the sound gets higher when the moving object comes closer the observer and becomes lower after it passes, This change is due to the quantity of waves that passes through an area in an unit of time.

The formula to calculate the Doppler effect is as follows

f = (\frac{c}{c+Vs}) · f₀

f is the observed frequency;

c is the speed of sound;

Vs is velocity of the source;

f₀ is the emitted frequency of source;

Substituting and calculating,

f = \frac{340}{340+30} · 300

f = 275.675 Hz

Thus, the frequency heard by the police officer is 275.675Hz.

8 0
4 years ago
You throw a ball straight up. The ball has an initial speed of 11.2 m/s when it leaves your hand What is the maximum height the
Jet001 [13]

Answer:

Explanation:

Given

initial velocity u=11.2\ m/s

At maximum height velocity of ball is zero

using

v^2-u^2=2as

where v=final velocity

u=initial velocity

a=acceleration

s=displacement

(0)^2 -(11.2)^2=2\times (-9.8)\times (s)

s=\frac{11.2^2}{2\times 9.8}

s=6.4

time taken by the ball to reach the maximum height

v=u+at

0=11.2-9.8\times t

t=\frac{11.2}{9.8}

t=1.142\ s

At t=2\ s height of ball is

h=ut+\\frac{1}{2}at^2

h=11.2\times 2-\frac{1}{2}9.8\times (2)^2

h=22.4-19.6

h=2.8\ m

i.e. ball is moving downward

height at v=5\ m/s

v^2-u^2=2as

s=\frac{25-125.4}{2\times (-9.8)}

s=5.12\ m    

8 0
3 years ago
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