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3 years ago

Describe a situation where an object would have potential energy transformed into kinetic energy?

Physics

2 answers:

tigry1 [53]3 years ago

6 0

Answer:

When an object falls, its gravitational potential energy is changed to kinetic energy.

Explanation:

Alinara [238K]3 years ago

5 0

A prime example is a rollercoaster. As the rollercoaster goes up the hill it has a ton of potential energy and as it falls it is turned into kinetic energy which keeps the coaster moving.

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A ball rolls of a cliff and when it lands has a vertical velocity 35 ms ^-1. how high was the cliff?

Licemer1 [7]

Using V²=u² +2gH
let's assume the ball falls from rest, then it's initial velocity = 0ms-¹ (U=0)
then from the above info V= 35ms-¹
g= 10ms-² (value of acceleration due to gravity to the nearest tens)

so input your values above into the given formula to find height
35² = 0² +2×10×H
1225 = 20H
H = 1225÷20 = 61.25m

6 0

4 years ago

1. A wheel has a radius of 4.1 m. How far (path length) does a point on the wheel travel if the wheel is rotated through angles

Olin [163]

Answer:

a) 2.15 m

b) 123 m

c) 772.8 m

Explanation:

Circular Motion

One point located at a distance r from the center of rotation travels a distance L given by the arc length :

$L= \theta r$

Where $\theta$ is the angle formed during the rotation.

The wheel described in the question has a radius r=4.1 m and a point on the wheel rotates some angles given in each part:

a) $\theta=30^o=30\cdot \pi / 180=\pi/6 \ rad$

Calculating L

$L= \pi/6 \cdot 4.1=2.15 \ m$

b) $\theta=30\ rad$

$L= 30 \cdot 4.1=123 \ m$

c) $\theta = 30\ revolutions = 30\cdot 2\pi\ rad=60\pi \ rad$

$L= 60\pi \cdot 4.1=772.8 \ m$

5 0

3 years ago

In a certain process, the energy of the system decreases by 250 kJkJ. The process involves 480 kJkJ of work done on the system.

BigorU [14]

Answer:

-730KJ

Explanation:

According to the first law of thermodynamics;

Let the total energy of the system be ∆E

Let heat be q and let work the w

Since the energy decreases ∆E is negative

Since work is done on the system w= positive

So;

- 250 = 480 + q

q = -250 - 480

q=-730KJ

5 0

3 years ago

7 places that carbon exists

BigorU [14]

Trees
Animals
Grass
Minerals
Coal
Fossil fuels
Natural gas

7 0

4 years ago

1. An electron (Q=16x10^-20 C, m=1x10^-30 kg) moving at half a megameter per second up the page enters a region with a uniform m

jek_recluse [69]

Explanation:

It is given that,

Charge on electron, $q=16\times 10^{-20}\ C$

Mass of the electron, $m=9.1\times 10^{-31}\ kg$

Speed of the electron, $v=0.5\ Mm/s=0.5\times 10^6\ m/s$

Magnetic field, B = 1 T (directed out of the page)

Let F is the magnetic force acting on the electron. It is given by :

$F=qvB\ sin\theta$

Here, $\theta=90^{\circ}$

$F=qvB$

$F=16\times 10^{-20}\ C\times 0.5\times 10^6\ m/s\times 1\ T$

$F=8\times 10^{-14}\ N$

Using the right hand rule, the direction of magnetic force is upward to the plane of the paper. Also, the electron will follow the circular path. It is given by :

$r=\dfrac{mv}{qB}$

$r=\dfrac{9.1\times 10^{-31}\ kg\times 0.5\times 10^6\ m/s}{16\times 10^{-20}\ C\times 1\ T}$

$r=2.84\times 10^{-6}\ m$

Hence, this is the required solution.

7 0

3 years ago