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3 years ago

Based on this activity, is kinetic energy always transformed into potential energy?

Physics

2 answers:

nasty-shy [4]3 years ago

8 0

Answer:

No, kinetic energy isn’t always transformed into potential energy. It happens only in some cases.

Explanation:

plato answer

Rus_ich [418]3 years ago

5 0

Potential energy is energy stored in an object due to its position or arrangement. Kinetic energy is energy of an object due to its movement - its motion. ... Potential energy can be converted into kinetic energy, and kinetic energy can be converted into potential energy

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How much work is done when holding a 10 N bag of apples while waiting in line at the grocery store for 4 minutes? Group of answe

Solnce55 [7]

Practically ANYbody could answer this question if you actually showed them the group of answer choices. Here at Brainly, our members, contributors, sycophants, consultants, and devotees are so great that we can answer it even withOUT seeing them.

The answer is: <em>Zero</em> work is done.

"Work", in the formal Physics usage, means a force acting through a distance. If you're holding a bag of apples UP but it's not moving UP, then your force is not moving through a distance, and the quantity of work is zero.

6 0

2 years ago

Two metal bricks are held off the edge of a balcony from the same height above the ground. The bricks are the same size but one

Dvinal [7]

Answer:

Explanation:

Assuming that the air resistance is neglectable, both bricks are only accelerated by gravity, which produces a constant acceleration on both bricks, which is the same, according Newton's 2nd Law, as we can see below:
$F_{g} = m*g = m*a (1)$
⇒a = g = 9.8m/s² (pointing downward)
Since acceleration is constant, if both fall from the same height, we can apply the following kinematic equation:

$\Delta y = v_{o} * t - \frac{1}{2} *g*t^{2} (2)$

Since both bricks are held off the edge, the initial speed is zero, so (2) reduces to the following equation:

$h =\frac{1}{2} *g*t^{2} (3)$

Since h (the height of the balcony) is the same, we conclude that both bricks hit ground at exactly the same time.
If the air resistance is not negligible, due both bricks have zero initial speed, and have the same shape, they will be affected by the drag force in similar way, so they will reach the ground at approximately the same time.

6 0

2 years ago

Lithium was one of the metals studied by the American physicist Robert Millikan in his research on the photoelectric effect. Whe

faltersainse [42]

Answer:

f = 7.9487 10¹³ Hz

Explanation:

The photoelectric effect was correctly explained by Einstein assuming that the radiation is composed of photons, which behave like particles.

hf = K + Ф

It indicates the frequency and the kinetic energy, let's look for the work function

Ф = hf - K

let's reduce the magnitudes to the SI system

K = 0.332 eV (1.6 10⁻¹⁹ J / 1 eV) = 0.5312 10⁻⁻¹⁹ J

let's calculate

Ф = 6.63 10⁻⁻³⁴ 6.64 10¹¹ - 0.5312 10⁻¹⁹

Ф = 4.40 10⁻²² - 0.5312 10⁻¹⁹

Ф = 5.27 10⁻²⁰ J

for the minimum frequency that produces photoelectrons, the kinetic energy is zero

hf = Ф

f = Ф / h

f = 5.27 10⁻²⁰ / 6.63 10⁻³⁴

f = 7.9487 10¹³ Hz

4 0

2 years ago

A very strong, but inept, shot putter puts the shot straight up vertically with an initial velocity of 11.1 m/s. How long does h

balandron [24]

We need to use the kinematic equation
S=ut+(1/2)at^2
where
S=displacement (+=up, in metres)
u=initial velocity (m/s)
t=time (seconds)
a=acceleration (+=up, in m/s^2)

Substitute values
S=displacement = 1.96-2.27 = -0.31 m (so that shot does not hit his head)
u=11.1
a=-9.81 (acceleration due to gravity)

-0.31=11.1t+(1/2)(-9.81)t^2
Rearrange and solve for t
-4.905t^2+11.1t-0.31=0
t=-0.02756 or t=2.291 seconds
Reject the negative root to give
t=2.29 seconds (to 3 significant figures)

3 0

3 years ago

3. A ray of light consisting of blue light (wavelength 480 nm) and red light (wavelength 670 nm) is incident on a thick piece of

Alex Ar [27]

Answer:

The angular separation between the refracted red and refracted blue beams while they are in the glass is 42.555 - 42.283 = 0.272 degrees.

Explanation:

Given that,

The respective indices of refraction for the blue light and the red light are 1.4636 and 1.4561.

A ray of light consisting of blue light (wavelength 480 nm) and red light (wavelength 670 nm) is incident on a thick piece of glass at 80 degrees.

We need to find the angular separation between the refracted red and refracted blue beams while they are in the glass.

Using Snell's law for red light as :

$n_1\sin\theta_1=n_2\sin\theta_2\\\\\theta_2=\sin^{-1}((\dfrac{n_2}{n_1})\sin\theta_1)\\\\\theta_2=\sin^{-1}((\dfrac{1}{1.4561})\sin(80))\\\\\theta_2=42.555$

Again using Snell's law for blue light as :

$n_1\sin\theta_1=n_2\sin\theta'_2\\\\\theta'_2=\sin^{-1}((\dfrac{n_2}{n_1})\sin\theta_1)\\\\\theta'_2=\sin^{-1}((\dfrac{1}{1.4636 })\sin(80))\\\\\theta'_2=42.283$

The angular separation between the refracted red and refracted blue beams while they are in the glass is 42.555 - 42.283 = 0.272 degrees.

7 0

3 years ago