All categories

4 years ago

The amount of potential energy possessed by an elevated object is equal to

Physics

1 answer:

Sedbober [7]4 years ago

4 0

Answer:

Potential energy of the object will be equal to mgh

Explanation:

Let the mass of the object is m

Acceleration due to gravity is $gm/sec^2$

Let the object is released from height h

We have to find the potential energy

Potential energy is of an object released from height h is equal to

$U=mgh$ , here m is mass, g is acceleration due to gravity and h is height from which object is released.

You might be interested in

A model airplane is flying horizontally due north at 44 mi/hr when it encounters a horizontal crosswind blowing east at 44 mi/

Alik [6]

Explanation:

Let i, j and k represents east, north and upward direction respectively.

Velocity due north, $v_a=44j\ mi/hr$

Velocity of the crosswind, $v_w=44i\ mi/hr$

Velocity of downdraft, $v_d=-22k\ mi/hr$ (downward direction)

(a) Let v is the position vector that represents the velocity of the plane relative to the ground. It is given by :

$v=44i+44j-22k$

(b) The speed of the plane relative to the ground can be calculated as :

$v=\sqrt{44^2+44^2+22^2}$

v = 66 m/s

Hence, this is the required solution.

7 0

3 years ago

The direction of swing of a Foucault pendulum appears to change due to Earth’s

Salsk061 [2.6K]

French Physicist Leon Foucault introduced his pendulum in 1851.
By that time, it was generally accepted that the Earth rotates, but
Foucault's pendulum was the first simple demonstration that made
the Earth's rotation easy to prove.

6 0

3 years ago

A dog pulls on a pillow with a force of 5 N at an angle of 37o to the horizontal. Find the x and y components of this force.

Paha777 [63]

Answer:

$x=3.99\ N\approx4\ N$

$y=3\ N$

Explanation:

Given :

Force with which dog pulls the pillow = 5 N

Angle of force to the horizontal = 37°

To find the $x$ and $y$ components of force.

Solution:

For a force $F$ making an angle $\theta$ with the horizontal, the

1) $x$ component or the horizontal component is given by:

$x=F\cos\theta$

2) $y$ component or the vertical component is given by:

$y=F\sin\theta$

Plugging the know values to find $x$ and $y$ components of force applied by the dog on pillow

1) $x=5\cos37\°$

∴ $x=3.99\ N\approx4\ N$ (Answer)

2) $y=5\sin37\°$

∴ $y=3\ N$ (Answer)

7 0

3 years ago

Where would you weigh the most?

uranmaximum [27]

Answer:

mars

Explanation:

4 0

4 years ago

Read 2 more answers

Physics question 28 plz help me

Alexus [3.1K]

Answer:

a. I = 30 A

b. E = 1080000 J = 1080 KJ

c. ΔT = 12.86°C

d. Cost = $ 4.32

Explanation:

The current in the coil is given by Ohm's Law:

$V = IR\\I = \frac{V}{R}$

where,

I = current = ?

V = Voltage = 120 V

R = Resistance = 4 Ω

Therefore,

$I = \frac{120\ V}{4 \Omega}\\$

I = 30 A

The energy can be calculated as:

$E = VIt\\E = (120\ V)(30\ A)(5\ min)(\frac{60\ s}{1\ min})\\$

E = 1080000 J = 1080 KJ

For the increase in the temperature of water:

$E = mC\Delta T\\$

where,

m = mass of water = 20 kg

C = specific heat of water = 4.2 KJ/kg.°C

Therefore,

$1080\ KJ = (20\ kg)(4.2\ KJ/kg.^oC)\Delta T$

ΔT = 12.86°C

First, we will calculate the total energy consumed:

$E=(Power)(Time)\\E=VI(Time)\\E = (120\ V)(30\ A)(0.5\ h/d)(30\ d)\\E = 54000\ Wh\\E = 54 KWh$

Now, for the cost:

$Cost = (Unit\ Cost)(Energy)\\Cost = (\$ 0.08\KWh)(54\ KWh)$

Cost = $ 4.32

7 0

3 years ago